首页 > 最新文献

Palaeogeography, Palaeoclimatology, Palaeoecology最新文献

英文 中文
Glaciovolcanic processes between the Campbell Glacier and Mt. Melbourne Volcano, Antarctica: ICE and FIRE 南极洲坎贝尔冰川和墨尔本火山之间的冰川火山过程:冰与火
IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL Pub Date : 2024-11-16 DOI: 10.1016/j.palaeo.2024.112611
Hyun Hee Rhee , Min Kyung Lee , Yeong Bae Seong , Sunghan Kim , Jae Il Lee , Kyu-Cheul Yoo , Byung Yong Yu
This study investigates the glacial dynamics of the Campbell Glacier in Terra Nova Bay (TNB), Antarctica, with a focus on its unique lowering patterns during the late Quaternary. Using cosmogenic nuclides (10Be) surface exposure dating, we provide significant chronological constraints on Antarctic terrestrial glacier changes. In addition to the previous data on Marine Isotope Stage (MIS) 5 simple exposure ages of Campbell Glacier moraines, we further analyzed the palaeo-subglaciated bedrock, which yields exposure ages during MIS 3 and 2 (49.8–28.5 ka). Our analysis empowers that continuous glacial lowering occurred throughout the late Quaternary, even during the Last Glacial Period (MIS 4–2), and that the Local Last Glacial Maximum (LLGM) occurred at 150–90 masl during MIS 4 rather than MIS 2. This new and recalculated dataset for the Campbell Glacier is unique compared to other outlet glaciers flowing into the Terra Nova Bay, highlighting the significant influence of Mt. Melbourne's volcanic activity via glaciovolcanic processes during the late Quaternary, beyond general climatic and oceanic factors. Further studies of palaeo-glaciovolcanic interactions on the East Antarctic Ice Sheet (EAIS) promise to provide more robust insights for refining models predicting future accelerated glacial melt and sea level rise, particularly considering the numerous volcanoes beneath the West Antarctic Ice Sheet (WAIS).
本研究调查了南极洲泰拉诺瓦湾(TNB)坎贝尔冰川的冰川动力学,重点是其在第四纪晚期独特的下降模式。利用宇宙成因核素(10Be)表面暴露年代测定法,我们对南极陆地冰川的变化提供了重要的年代学约束。除了之前坎贝尔冰川冰碛的海洋同位素阶段(MIS)5简单暴露年龄数据外,我们还进一步分析了古冰川基岩,得出了MIS 3和MIS 2(49.8-28.5 ka)的暴露年龄。我们的分析证实,在整个第四纪晚期,甚至在末次冰川期(MIS 4-2),冰川都在持续降低,而当地末次冰川极值(LLGM)发生在 MIS 4 而不是 MIS 2 期间的 150-90 masl。与流入特拉诺瓦湾的其他出口冰川相比,坎贝尔冰川的这一新的和重新计算的数据集是独一无二的,突出了墨尔本山火山活动在第四纪晚期通过冰川火山过程产生的重大影响,而不是一般的气候和海洋因素。对南极东部冰盖(EAIS)上古冰川火山相互作用的进一步研究有望为完善预测未来冰川加速融化和海平面上升的模型提供更有力的见解,特别是考虑到南极西部冰盖(WAIS)下的众多火山。
{"title":"Glaciovolcanic processes between the Campbell Glacier and Mt. Melbourne Volcano, Antarctica: ICE and FIRE","authors":"Hyun Hee Rhee ,&nbsp;Min Kyung Lee ,&nbsp;Yeong Bae Seong ,&nbsp;Sunghan Kim ,&nbsp;Jae Il Lee ,&nbsp;Kyu-Cheul Yoo ,&nbsp;Byung Yong Yu","doi":"10.1016/j.palaeo.2024.112611","DOIUrl":"10.1016/j.palaeo.2024.112611","url":null,"abstract":"<div><div>This study investigates the glacial dynamics of the Campbell Glacier in Terra Nova Bay (TNB), Antarctica, with a focus on its unique lowering patterns during the late Quaternary. Using cosmogenic nuclides (<sup>10</sup>Be) surface exposure dating, we provide significant chronological constraints on Antarctic terrestrial glacier changes. In addition to the previous data on Marine Isotope Stage (MIS) 5 simple exposure ages of Campbell Glacier moraines, we further analyzed the palaeo-subglaciated bedrock, which yields exposure ages during MIS 3 and 2 (49.8–28.5 ka). Our analysis empowers that continuous glacial lowering occurred throughout the late Quaternary, even during the Last Glacial Period (MIS 4–2), and that the Local Last Glacial Maximum (LLGM) occurred at 150–90 masl during MIS 4 rather than MIS 2. This new and recalculated dataset for the Campbell Glacier is unique compared to other outlet glaciers flowing into the Terra Nova Bay, highlighting the significant influence of Mt. Melbourne's volcanic activity via glaciovolcanic processes during the late Quaternary, beyond general climatic and oceanic factors. Further studies of palaeo-glaciovolcanic interactions on the East Antarctic Ice Sheet (EAIS) promise to provide more robust insights for refining models predicting future accelerated glacial melt and sea level rise, particularly considering the numerous volcanoes beneath the West Antarctic Ice Sheet (WAIS).</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"657 ","pages":"Article 112611"},"PeriodicalIF":2.6,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exploring the deep water mass turnovers in the Eastern Indian Ocean since the late Oligocene: Significance of ocean gateways and paleoclimate 探索自渐新世晚期以来东印度洋的深海水团翻转:海洋门户和古气候的意义
IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL Pub Date : 2024-11-15 DOI: 10.1016/j.palaeo.2024.112607
Himanshu Bali , Anil K. Gupta , Sudheer Joseph , Arun Kaushik
Tectonically driven adjustments within ocean gateways and their impacts on deep water production, thermohaline circulation, and nutrient distribution are well constrained. With no deep water formation in the modern northern Indian Ocean, this study aims to reconstruct the possible source and pathways of deep circulation since the late Oligocene, altering the water mass properties at study sites in the eastern Indian Ocean. Our benthic foraminifera results suggest that tectonic gateways influenced the deep water masses in the eastern Indian Ocean. Significant changes in deep water masses at the studied sites commenced with a gradual reduction in corrosive deep water in the eastern equatorial Indian Ocean (EIO) due to the inflow of relatively warmer and less corrosive Tethyan Overflow Water (TOW) through the Tethyan Gateway in the late Oligocene (∼24 Ma). The EIO gradually became less corrosive from the late Oligocene to the middle Miocene (∼24 to 14 Ma). This turnover reflects the intrusion of southward-flowing TOW and a reduction in the Antarctic Bottom Water (AABW) between ∼24 and ∼ 14.5 Ma in the Indian Ocean. Hereafter, a significant switch in deep water mass was established, contemporaneous with the expansion of Antarctic ice sheets that led to the enhanced production of cold and corrosive AABW that replaced the warm and less corrosive TOW at ∼14 Ma. Furthermore, between ∼12 and 8 Ma the closure of the Tethys Seaway caused a significant hydrological reorganization, replacing the TOW with the Pacific Deep Water (PDW) and North Component Water (NCW). At ∼8 Ma, the contribution of the PDW diminished and AABW flow increased again after a reduction between 12 and 8 Ma, leading to a gradual increase in corrosive deep water. Since 8 Ma, a circulation pattern resembling the modern framework was established with the intrusion of the North Atlantic Deep Water into the CDW, and this pattern was developed by ∼5.7 Ma. Furthermore, the final closure of the Central American Seaway increased the formation of the NADW and its intrusion into the CDW after ∼3.2 Ma.
大洋门户内构造驱动的调整及其对深水生成、温盐环流和营养物质分布的影响受到了很好的制约。由于现代北印度洋没有深水形成,本研究旨在重建晚渐新世以来深层环流的可能来源和路径,改变东印度洋研究地点的水团特性。我们的底栖有孔虫研究结果表明,构造门影响了东印度洋的深层水团。研究地点深水水团的显著变化始于赤道印度洋东部(EIO)腐蚀性深水的逐渐减少,这是由于在渐新世晚期(∼24 Ma),相对较暖和腐蚀性较弱的哲罗纪溢流水(TOW)通过哲罗纪门户流入。从渐新世晚期到中新世中期(24 ∼ 14 Ma),EIO 的腐蚀性逐渐减弱。这一变化反映了南流 TOW 的侵入以及印度洋南极底层水(AABW)在 24 至 14.5 Ma 之间的减少。此后,随着南极冰盖的扩张,深层水的质量发生了重大变化,导致冷的和腐蚀性强的南极底层水(AABW)的生成量增加,在 14 Ma ∼时取代了温暖的和腐蚀性较弱的南极底层水(TOW)。此外,在 ∼12 到 8 Ma 之间,特提斯海道的关闭引起了重大的水文重组,太平洋深水(PDW)和北成分水(NCW)取代了 TOW。在 ∼8 Ma 时,PDW 的贡献减少,AABW 流量在 12 至 8 Ma 期间减少后再次增加,导致腐蚀性深水逐渐增加。自 8 Ma 起,随着北大西洋深水侵入 CDW,建立了类似现代框架的环流模式,这种模式在 5.7 Ma 以前得到了发展。此外,中美洲海道的最终关闭增加了北大西洋深水的形成,并在∼3.2Ma之后将其侵入CDW。
{"title":"Exploring the deep water mass turnovers in the Eastern Indian Ocean since the late Oligocene: Significance of ocean gateways and paleoclimate","authors":"Himanshu Bali ,&nbsp;Anil K. Gupta ,&nbsp;Sudheer Joseph ,&nbsp;Arun Kaushik","doi":"10.1016/j.palaeo.2024.112607","DOIUrl":"10.1016/j.palaeo.2024.112607","url":null,"abstract":"<div><div>Tectonically driven adjustments within ocean gateways and their impacts on deep water production, thermohaline circulation, and nutrient distribution are well constrained. With no deep water formation in the modern northern Indian Ocean, this study aims to reconstruct the possible source and pathways of deep circulation since the late Oligocene, altering the water mass properties at study sites in the eastern Indian Ocean. Our benthic foraminifera results suggest that tectonic gateways influenced the deep water masses in the eastern Indian Ocean. Significant changes in deep water masses at the studied sites commenced with a gradual reduction in corrosive deep water in the eastern equatorial Indian Ocean (EIO) due to the inflow of relatively warmer and less corrosive Tethyan Overflow Water (TOW) through the Tethyan Gateway in the late Oligocene (∼24 Ma). The EIO gradually became less corrosive from the late Oligocene to the middle Miocene (∼24 to 14 Ma). This turnover reflects the intrusion of southward-flowing TOW and a reduction in the Antarctic Bottom Water (AABW) between ∼24 and ∼ 14.5 Ma in the Indian Ocean. Hereafter, a significant switch in deep water mass was established, contemporaneous with the expansion of Antarctic ice sheets that led to the enhanced production of cold and corrosive AABW that replaced the warm and less corrosive TOW at ∼14 Ma. Furthermore, between ∼12 and 8 Ma the closure of the Tethys Seaway caused a significant hydrological reorganization, replacing the TOW with the Pacific Deep Water (PDW) and North Component Water (NCW). At ∼8 Ma, the contribution of the PDW diminished and AABW flow increased again after a reduction between 12 and 8 Ma, leading to a gradual increase in corrosive deep water. Since 8 Ma, a circulation pattern resembling the modern framework was established with the intrusion of the North Atlantic Deep Water into the CDW, and this pattern was developed by ∼5.7 Ma. Furthermore, the final closure of the Central American Seaway increased the formation of the NADW and its intrusion into the CDW after ∼3.2 Ma.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"657 ","pages":"Article 112607"},"PeriodicalIF":2.6,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Late Triassic sedimentary environments and detrital zircon provenance analysis in the Amdo area of the Tibetan Plateau: Implications for the evolution of the Meso-Tethys Ocean 青藏高原安多地区晚三叠世沉积环境与锆英石来源分析:对中特提斯洋演化的影响
IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL Pub Date : 2024-11-14 DOI: 10.1016/j.palaeo.2024.112601
Shiyao Gao , Zhongjie Xu , Chaoming Xie , Zainaibai Ma , Peizhao Deng , Haoxuan Liu
Aspects of the early Mesozoic evolution of the Meso-Tethys Ocean remain uncertain, and detrital zircon provenance analyses may be useful for constraining the development of this region. In this paper, we describe Late Triassic sedimentary facies, petrography, geochemistry, and detrital zircon UPb geochronology for the Tumengela Formation (South Qiangtang Basin) and the Quehala Formation (Amdo back-arc basin) in the Tibetan Plateau. In Late Triassic times, the South Qiangtang Basin was characterized by marine deltaic environments adjacent to an evaporative platform, whereas the Amdo back-arc basin was characterized by a shallow marine shelf fringed by tidally-influenced deltas; in both basins, marine palaeoenvironments first deepened and then shallowed. By analyzing the characteristics of detrital zircon UPb age spectra for each microcontinent on the northern margin of Gondwana, and combining them with previously published data, we infer that the North and South Qiangtang Terranes amalgamated in Late Triassic times, and were separated from the Lhasa Terrane by the wide Meso-Tethys Ocean. During the Late Triassic, the Meso-Tethys Ocean began to be subducted, and the southern edge of the South Qiangtang Terrane developed as an active continental margin. The Quehala Formation accumulated in the back-arc basin of the Amdo microcontinent during subduction of the Meso-Tethys Ocean, and the uppermost part of Member 2 of the Quehala Formation is dated as no older than Early Jurassic.
中特提斯洋中生代早期演化的某些方面仍不确定,而非晶质锆石出处分析可能有助于制约该地区的发展。本文描述了青藏高原图门格拉地层(南羌塘盆地)和曲哈拉地层(安多弧后盆地)的晚三叠世沉积面、岩相学、地球化学和非晶锆石UPb地质年代。在晚三叠世,南羌塘盆地的特征是邻近蒸发平台的海洋三角洲环境,而安多弧后盆地的特征是由潮汐影响的三角洲环绕的浅海陆架;在这两个盆地中,海洋古环境先加深后变浅。通过分析冈瓦纳北缘各微大陆的非铁质锆石UPb年龄谱特征,并结合之前已发表的数据,我们推断南北羌塘地块在晚三叠世时合并,并与拉萨地块被宽阔的中特提斯洋分隔开来。三叠纪晚期,中特提斯洋开始俯冲,南羌塘地块南缘发育为活跃的大陆边缘。在中特提斯洋俯冲过程中,奎哈拉地层堆积于安多微大陆的弧后盆地,奎哈拉地层第2层最上部的年代不早于早侏罗世。
{"title":"Late Triassic sedimentary environments and detrital zircon provenance analysis in the Amdo area of the Tibetan Plateau: Implications for the evolution of the Meso-Tethys Ocean","authors":"Shiyao Gao ,&nbsp;Zhongjie Xu ,&nbsp;Chaoming Xie ,&nbsp;Zainaibai Ma ,&nbsp;Peizhao Deng ,&nbsp;Haoxuan Liu","doi":"10.1016/j.palaeo.2024.112601","DOIUrl":"10.1016/j.palaeo.2024.112601","url":null,"abstract":"<div><div>Aspects of the early Mesozoic evolution of the Meso-Tethys Ocean remain uncertain, and detrital zircon provenance analyses may be useful for constraining the development of this region. In this paper, we describe Late Triassic sedimentary facies, petrography, geochemistry, and detrital zircon U<img>Pb geochronology for the Tumengela Formation (South Qiangtang Basin) and the Quehala Formation (Amdo back-arc basin) in the Tibetan Plateau. In Late Triassic times, the South Qiangtang Basin was characterized by marine deltaic environments adjacent to an evaporative platform, whereas the Amdo back-arc basin was characterized by a shallow marine shelf fringed by tidally-influenced deltas; in both basins, marine palaeoenvironments first deepened and then shallowed. By analyzing the characteristics of detrital zircon U<img>Pb age spectra for each microcontinent on the northern margin of Gondwana, and combining them with previously published data, we infer that the North and South Qiangtang Terranes amalgamated in Late Triassic times, and were separated from the Lhasa Terrane by the wide Meso-Tethys Ocean. During the Late Triassic, the Meso-Tethys Ocean began to be subducted, and the southern edge of the South Qiangtang Terrane developed as an active continental margin. The Quehala Formation accumulated in the back-arc basin of the Amdo microcontinent during subduction of the Meso-Tethys Ocean, and the uppermost part of Member 2 of the Quehala Formation is dated as no older than Early Jurassic.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"657 ","pages":"Article 112601"},"PeriodicalIF":2.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Skolithos piperock from the Lower Devonian storm beds 下泥盆统风暴床中的 Skolithos piperock
IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL Pub Date : 2024-11-14 DOI: 10.1016/j.palaeo.2024.112604
Daniel Sedorko , Dirk Knaust , Marcelo Nery Junior , Gabriel Eduardo Barea de Barros , Victor Ribeiro , Felipe Nascimento Sousa , Renato Pirani Ghilardi , Leonardo Borghi
Skolithos piperock is prevalent in Cambrian shallow marine deposits but diminishes throughout the Paleozoic. This study reports an interval with Skolithos piperock from the upper Furnas Formation (Lower Devonian), offering insights into the paleoenvironmental interpretation of nearshore sandstones. The studied section comprises eight sedimentary facies, transitioning from sandstone-dominated intervals indicative of nearshore environments to siltstone and mudstone facies representing lower energy transitional offshore conditions. Trace fossils are grouped into six ichnocoenoses, reflecting varying depositional settings from proximal to distal in the coastal zone. Notable shifts in ichnocoenosis composition, particularly the transition from Skolithos piperock to the Asterosoma ichnocoenosis, mark stratigraphic boundaries and highlight a transgressive trend between the Furnas and Ponta Grossa formations. The identification of Skolithos piperock provides evidence of storm-generated deposits and reworking activities, which can be applied to basin-scale correlations. This occurrence of a Skolithos piperock is interpreted as the result of several erosive processes triggered by storms, generating a time-averaged ichnoassemblage.
Skolithos琵琶岩在寒武纪浅海沉积中很普遍,但在整个古生代中逐渐减少。本研究报告了上福纳斯地层(下泥盆统)中含有 Skolithos piperock 的一个区段,为近岸砂岩的古环境解释提供了启示。所研究的剖面包括八个沉积层面,从表明近岸环境的砂岩为主的区间过渡到代表低能过渡近岸条件的粉砂岩和泥岩层面。痕量化石被归类为 6 个泥盆化石群,反映了沿岸带从近岸到远岸的不同沉积环境。化石群组成的显著变化,特别是从琵琶岩化石群(Skolithos piperock)向星状化石群(Asterosoma ichnocoenosis)的过渡,标志着地层的边界,突出了富尔纳斯地层和蓬塔格罗萨地层之间的递变趋势。Skolithos piperock 的发现为风暴生成的沉积物和再加工活动提供了证据,可用于盆地尺度的相关性研究。Skolithos piperock 的出现被解释为风暴引发的多个侵蚀过程的结果,产生了时间平均的蛭石组合。
{"title":"Skolithos piperock from the Lower Devonian storm beds","authors":"Daniel Sedorko ,&nbsp;Dirk Knaust ,&nbsp;Marcelo Nery Junior ,&nbsp;Gabriel Eduardo Barea de Barros ,&nbsp;Victor Ribeiro ,&nbsp;Felipe Nascimento Sousa ,&nbsp;Renato Pirani Ghilardi ,&nbsp;Leonardo Borghi","doi":"10.1016/j.palaeo.2024.112604","DOIUrl":"10.1016/j.palaeo.2024.112604","url":null,"abstract":"<div><div><em>Skolithos</em> piperock is prevalent in Cambrian shallow marine deposits but diminishes throughout the Paleozoic. This study reports an interval with <em>Skolithos</em> piperock from the upper Furnas Formation (Lower Devonian), offering insights into the paleoenvironmental interpretation of nearshore sandstones. The studied section comprises eight sedimentary facies, transitioning from sandstone-dominated intervals indicative of nearshore environments to siltstone and mudstone facies representing lower energy transitional offshore conditions. Trace fossils are grouped into six ichnocoenoses, reflecting varying depositional settings from proximal to distal in the coastal zone. Notable shifts in ichnocoenosis composition, particularly the transition from <em>Skolithos</em> piperock to the <em>Asterosoma</em> ichnocoenosis, mark stratigraphic boundaries and highlight a transgressive trend between the Furnas and Ponta Grossa formations. The identification of <em>Skolithos</em> piperock provides evidence of storm-generated deposits and reworking activities, which can be applied to basin-scale correlations. This occurrence of a <em>Skolithos</em> piperock is interpreted as the result of several erosive processes triggered by storms, generating a time-averaged ichnoassemblage.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"656 ","pages":"Article 112604"},"PeriodicalIF":2.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sedimentary provenance and paleogeographic environment of a Mississippian coal-bearing unit in South China: Constraints from detrital zircon U-Pb ages and sedimentologic and geochemical evidence 华南地区一个密西西比时期含煤单元的沉积产地和古地理环境:来自碎屑锆石U-Pb年龄以及沉积学和地球化学证据的制约因素
IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL Pub Date : 2024-11-13 DOI: 10.1016/j.palaeo.2024.112605
Yuliang Mu, Rongsong Tian, Yong Fu, Li Yang, Jiang Hu
The Mississippian Xiangbai Formation in South China is one of the oldest coal-bearing sedimentary units in China. However, the sedimentary provenance, paleogeography, and coal formation patterns of the coal-bearing strata are not well constrained. We address this key issue by using a combination of detrital zircon U-Pb data, geochemical analyses of mudstone and shale, drilling data, and geologic field observations. With the exception of the early Paleozoic orogenic events (ca. 440–420 Ma) in the eastern part of the study area, the samples from the Xiangbai Formation exhibit similar detrital zircon U-Pb age distribution with major age peaks at ca. 980–960 Ma and several subordinate age peaks at ca. 800–780 and 600–500 Ma. These detrital zircon grains mainly originated from recycled sedimentary units. Field and drilling data reveal that the Xiangbai Formation was formed in a tidal flat environment with water depth gradually increasing from the bottom to the top, indicating an overall trend of transgression. The Mississippian Xiangbai Formation was deposited in an interglacial period. The Lower Xiangbai Formation was deposited in a relatively cold paleoclimate, gradually transitioning upwards to a warm and humid climate, creating favorable conditions for coal formation. The alternation of warming and cooling climates triggered high-frequency eustatic fluctuations, which led to multiple sedimentary cycles and resulted in thin, unstable coal seams within the Xiangbai Formation. Mississippian sedimentary paleogeography, palaeoclimate, and sedimentary provenance together dominate the coal-bearing clastic sediments in southwestern South China.
华南地区的密西西比系香柏地层是中国最古老的含煤沉积单元之一。然而,该含煤地层的沉积成因、古地理和成煤模式并没有得到很好的解释。我们结合使用了碎屑锆石 U-Pb 数据、泥岩和页岩的地球化学分析、钻探数据以及野外地质观测数据,解决了这一关键问题。除了研究区东部的早古生代造山运动事件(约 440-420 Ma)之外,湘白地层的样品表现出相似的非铁质锆石 U-Pb 年龄分布,主要年龄峰值约为 980-960 Ma,并有几个年龄峰值。锆石U-Pb年龄分布相似,主要年龄峰值约为980-960 Ma,几个次要年龄峰值约为800-780 Ma和600-500 Ma。800-780和600-500 Ma。这些锆英石碎屑主要来自循环沉积单元。野外和钻探资料显示,湘白地层形成于潮平带环境中,水深由下而上逐渐增加,显示出整体的横断趋势。密西西比系祥柏地层沉积于间冰期。湘白下统沉积在相对寒冷的古气候中,逐渐向上过渡到温暖湿润的气候,为煤炭的形成创造了有利条件。气候的冷暖交替引发了高频率的阵风波动,从而导致了多次沉积循环,并在湘白地层中形成了薄而不稳定的煤层。密西西比沉积古地理、古气候和沉积成因共同主导了华南西南部的含煤碎屑沉积。
{"title":"Sedimentary provenance and paleogeographic environment of a Mississippian coal-bearing unit in South China: Constraints from detrital zircon U-Pb ages and sedimentologic and geochemical evidence","authors":"Yuliang Mu,&nbsp;Rongsong Tian,&nbsp;Yong Fu,&nbsp;Li Yang,&nbsp;Jiang Hu","doi":"10.1016/j.palaeo.2024.112605","DOIUrl":"10.1016/j.palaeo.2024.112605","url":null,"abstract":"<div><div>The Mississippian Xiangbai Formation in South China is one of the oldest coal-bearing sedimentary units in China. However, the sedimentary provenance, paleogeography, and coal formation patterns of the coal-bearing strata are not well constrained. We address this key issue by using a combination of detrital zircon U-Pb data, geochemical analyses of mudstone and shale, drilling data, and geologic field observations. With the exception of the early Paleozoic orogenic events (ca. 440–420 Ma) in the eastern part of the study area, the samples from the Xiangbai Formation exhibit similar detrital zircon U-Pb age distribution with major age peaks at ca. 980–960 Ma and several subordinate age peaks at ca. 800–780 and 600–500 Ma. These detrital zircon grains mainly originated from recycled sedimentary units. Field and drilling data reveal that the Xiangbai Formation was formed in a tidal flat environment with water depth gradually increasing from the bottom to the top, indicating an overall trend of transgression. The Mississippian Xiangbai Formation was deposited in an interglacial period. The Lower Xiangbai Formation was deposited in a relatively cold paleoclimate, gradually transitioning upwards to a warm and humid climate, creating favorable conditions for coal formation. The alternation of warming and cooling climates triggered high-frequency eustatic fluctuations, which led to multiple sedimentary cycles and resulted in thin, unstable coal seams within the Xiangbai Formation. Mississippian sedimentary paleogeography, palaeoclimate, and sedimentary provenance together dominate the coal-bearing clastic sediments in southwestern South China.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"656 ","pages":"Article 112605"},"PeriodicalIF":2.6,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Indian summer monsoon history during the last glacial cycle revealed by a loess sequence from the Tibetan Plateau 青藏高原黄土序列揭示的上一个冰川周期印度夏季季风历史
IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL Pub Date : 2024-11-12 DOI: 10.1016/j.palaeo.2024.112593
Pushuang Li , Shengli Yang , Yuanlong Luo , Li Liu , Yixiao Zhang , Weiming Liu , Jingzhao Zhang , Xuechao Xu , Chen Wen , Qiong Li
The Indian Summer Monsoon (ISM) has a profound influence on the environment and people of East Asia. However, despite its importance, the variability and dynamic mechanisms of the ISM remain inadequately understood. This study investigates the evolution of the ISM since the Last Interglacial by analyzing the well-preserved Cuoweng (CW) loess–paleosol sequence in the southeastern Tibetan Plateau. A robust chronological framework is established using quartz optically stimulated luminescence (OSL) dating and K-feldspar post-infrared infrared stimulated luminescence (pIRIR) dating. The history of the ISM over the past ∼135 ka is reconstructed based on multiple environmental proxies. The results indicate that the ISM experienced significant glacial–interglacial fluctuations during the last glacial cycle, exhibiting a strengthened monsoon during warm periods and a weakened one during cold periods. Additionally, suborbital-scale cyclic variations in the ISM during the marine isotope stage (MIS) 5 are revealed, with enhanced monsoon conditions during MIS 5a, 5c, and 5e and weakened conditions during MIS 5b and 5d. These findings suggest that the ISM variations are primarily influenced by a combination of high- and low-latitude forcing. This study provides new insights into the complex responses of the ISM to climate change, enhancing our understanding of its potential future changes.
印度夏季季风(ISM)对东亚的环境和人类有着深远的影响。然而,尽管印度夏季季候风非常重要,但人们对其变异性和动态机制的了解仍然不足。本研究通过分析青藏高原东南部保存完好的翠峰(CW)黄土-页岩序列,研究了末次冰期以来印度夏季季风的演变。利用石英光学激发发光(OSL)测年法和K长石红外后激发发光(pIRIR)测年法建立了一个可靠的年代学框架。根据多种环境代用指标重建了 ISM 在过去 ∼135 ka 的历史。结果表明,在上一个冰川周期中,ISM经历了显著的冰川-冰川间波动,在温暖时期季风增强,在寒冷时期季风减弱。此外,研究还揭示了海洋同位素阶段(MIS)5 期间 ISM 的亚轨道尺度周期性变化,在 MIS 5a、5c 和 5e 期间季风条件增强,而在 MIS 5b 和 5d 期间季风条件减弱。这些发现表明,ISM的变化主要受到高纬度和低纬度作用力的共同影响。这项研究为了解ISM对气候变化的复杂反应提供了新的视角,加深了我们对其未来潜在变化的理解。
{"title":"Indian summer monsoon history during the last glacial cycle revealed by a loess sequence from the Tibetan Plateau","authors":"Pushuang Li ,&nbsp;Shengli Yang ,&nbsp;Yuanlong Luo ,&nbsp;Li Liu ,&nbsp;Yixiao Zhang ,&nbsp;Weiming Liu ,&nbsp;Jingzhao Zhang ,&nbsp;Xuechao Xu ,&nbsp;Chen Wen ,&nbsp;Qiong Li","doi":"10.1016/j.palaeo.2024.112593","DOIUrl":"10.1016/j.palaeo.2024.112593","url":null,"abstract":"<div><div>The Indian Summer Monsoon (ISM) has a profound influence on the environment and people of East Asia. However, despite its importance, the variability and dynamic mechanisms of the ISM remain inadequately understood. This study investigates the evolution of the ISM since the Last Interglacial by analyzing the well-preserved Cuoweng (CW) loess–paleosol sequence in the southeastern Tibetan Plateau. A robust chronological framework is established using quartz optically stimulated luminescence (OSL) dating and K-feldspar post-infrared infrared stimulated luminescence (pIRIR) dating. The history of the ISM over the past ∼135 ka is reconstructed based on multiple environmental proxies. The results indicate that the ISM experienced significant glacial–interglacial fluctuations during the last glacial cycle, exhibiting a strengthened monsoon during warm periods and a weakened one during cold periods. Additionally, suborbital-scale cyclic variations in the ISM during the marine isotope stage (MIS) 5 are revealed, with enhanced monsoon conditions during MIS 5a, 5c, and 5e and weakened conditions during MIS 5b and 5d. These findings suggest that the ISM variations are primarily influenced by a combination of high- and low-latitude forcing. This study provides new insights into the complex responses of the ISM to climate change, enhancing our understanding of its potential future changes.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"657 ","pages":"Article 112593"},"PeriodicalIF":2.6,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quaternary transgression process controlled by tectonic subsidence over the last 1.35 Ma: New insights from the eastern Bohai Sea 过去 1.35 千兆年构造沉降控制的第四纪横断过程:渤海东部的新发现
IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL Pub Date : 2024-11-12 DOI: 10.1016/j.palaeo.2024.112602
Wei Xiong , Long Huang , Yong Zhang , Zhonglei Wang , Nai Shuang Bi , Jun Pan , Jun Sun , Lelong He , Feifei Wang , Xi Mei
The Quaternary sedimentary history of the Yellow Sea and Bohai Sea offers significant insights into global sea-level changes. This history is intricately linked to tectonic subsidence. However, the process of the Quaternary transgressions of these areas remains controversial due to the lack of cores with comprehensive sedimentary sequences and reliable chronological frameworks in representative sites. This study evaluated the grain size, benthic foraminifera assemblages, quartz optically stimulated luminescence (OSL) dates, and magnetostratigraphy of Core CSH05 (102.4 m) from the eastern boundary of the Bohai Sea. By comparing these results with previous research, new insights were gained into sea-level changes and tectonic events in the Bohai Sea. The paleomagnetic analysis revealed the existence of Brunhes and Matuyama chrons in the core, including the Jaramillo and Cobb Mountain subchrons and Blake excursion. The boundary between the Brunhes and Matuyama chrons was determined at 57.2 m in the core, aligning with adjacent cores. The basal age of the core is estimated to be ∼1.35 Ma. Thirteen sedimentary units (U1-U13), consisting of seven neritic deposits and six terrestrial/littoral deposit layers, were identified in the core through sedimentology and environmental proxies (grain size and benthic foraminifera), indicating alternating transgression-regression cycles. OSL samples suggest that the neritic deposits layer (16.2–20.6 m) probably originated during the early Marine Isotope Stage 3 (MIS3), exhibiting a weaker transgression than MIS5 and MIS1. The initial transgression (U13) dates back to no later than 1.35 Ma, representing the earliest documentation in the Bohai Sea. U11 shows a transgression to 1 Ma, aligning with results from adjacent cores, indicating that the Miaodao Island uplift experienced further subsidence between 1 and 0.83 Ma, allowing seawater to inundate the central basin of the Bohai Sea during high sea level periods. The current sea-land configuration structure emerged after 0.3 Ma due to the complete subsidence of the Miaodao Islands Uplift. The Quaternary transgressions in the Bohai Sea demonstrate a coupling relationship with the uplift of the Qinghai Tibet Plateau, glacial-interglacial cycles, and integration of the Yellow River. This study traces the initial transgression in the Bohai Sea to 1.35 Ma and provides a new detailed evolutionary model of the timing and routes for the Quaternary transgression of the Bohai Sea and Yellow Sea, thereby enhancing our understanding of sedimentary evolution and paleoenvironmental changes in the region.
黄海和渤海的第四纪沉积历史为了解全球海平面变化提供了重要信息。这一历史与构造沉降密切相关。然而,由于缺乏具有代表性地点的全面沉积序列和可靠年代框架的岩芯,这些地区的第四纪断陷过程仍存在争议。本研究评估了渤海东部边界岩芯 CSH05(102.4 米)的粒度、底栖有孔虫组合、石英光激发发光(OSL)日期和磁地层学。通过将这些结果与以前的研究进行比较,对渤海的海平面变化和构造事件有了新的认识。古地磁分析表明,岩芯中存在布鲁内斯和松山脉,包括Jaramillo和Cobb山亚脉以及Blake偏移。在岩芯中 57.2 米处确定了布鲁内斯支系和松山支系的分界线,与邻近岩芯的分界线一致。岩芯的基底年龄估计为 1.35 Ma。通过沉积学和环境代用指标(粒度和底栖有孔虫),在岩芯中确定了 13 个沉积单元(U1-U13),其中包括 7 个海相沉积层和 6 个陆相/滨海沉积层,表明过渡-回归周期交替进行。OSL 样品表明,海相沉积层(16.2-20.6 米)可能起源于海洋同位素第三阶段(MIS3)早期,与 MIS5 和 MIS1 相比,表现出较弱的横断。最初的横断期(U13)可追溯到不晚于 1.35 Ma 的年代,代表了渤海最早的文献记载。U11显示的横断年代为1Ma,与相邻岩心的结果一致,表明庙岛隆起在1-0.83Ma之间经历了进一步的下沉,使得海水在高海平面时期淹没了渤海的中部盆地。由于庙岛群岛隆起的完全下沉,目前的海陆配置结构出现在 0.3 Ma 之后。渤海第四纪断陷显示了与青藏高原隆升、冰川-间冰期循环和黄河整合的耦合关系。该研究将渤海的初始横断面追溯到1.35Ma,为渤海和黄海第四纪横断面的发生时间和路线提供了一个新的详细演化模型,从而加深了我们对该地区沉积演化和古环境变化的认识。
{"title":"Quaternary transgression process controlled by tectonic subsidence over the last 1.35 Ma: New insights from the eastern Bohai Sea","authors":"Wei Xiong ,&nbsp;Long Huang ,&nbsp;Yong Zhang ,&nbsp;Zhonglei Wang ,&nbsp;Nai Shuang Bi ,&nbsp;Jun Pan ,&nbsp;Jun Sun ,&nbsp;Lelong He ,&nbsp;Feifei Wang ,&nbsp;Xi Mei","doi":"10.1016/j.palaeo.2024.112602","DOIUrl":"10.1016/j.palaeo.2024.112602","url":null,"abstract":"<div><div>The Quaternary sedimentary history of the Yellow Sea and Bohai Sea offers significant insights into global sea-level changes. This history is intricately linked to tectonic subsidence. However, the process of the Quaternary transgressions of these areas remains controversial due to the lack of cores with comprehensive sedimentary sequences and reliable chronological frameworks in representative sites. This study evaluated the grain size, benthic foraminifera assemblages, quartz optically stimulated luminescence (OSL) dates, and magnetostratigraphy of Core CSH05 (102.4 m) from the eastern boundary of the Bohai Sea. By comparing these results with previous research, new insights were gained into sea-level changes and tectonic events in the Bohai Sea. The paleomagnetic analysis revealed the existence of Brunhes and Matuyama chrons in the core, including the Jaramillo and Cobb Mountain subchrons and Blake excursion. The boundary between the Brunhes and Matuyama chrons was determined at 57.2 m in the core, aligning with adjacent cores. The basal age of the core is estimated to be ∼1.35 Ma. Thirteen sedimentary units (U1-U13), consisting of seven neritic deposits and six terrestrial/littoral deposit layers, were identified in the core through sedimentology and environmental proxies (grain size and benthic foraminifera), indicating alternating transgression-regression cycles. OSL samples suggest that the neritic deposits layer (16.2–20.6 m) probably originated during the early Marine Isotope Stage 3 (MIS3), exhibiting a weaker transgression than MIS5 and MIS1. The initial transgression (U13) dates back to no later than 1.35 Ma, representing the earliest documentation in the Bohai Sea. U11 shows a transgression to 1 Ma, aligning with results from adjacent cores, indicating that the Miaodao Island uplift experienced further subsidence between 1 and 0.83 Ma, allowing seawater to inundate the central basin of the Bohai Sea during high sea level periods. The current sea-land configuration structure emerged after 0.3 Ma due to the complete subsidence of the Miaodao Islands Uplift. The Quaternary transgressions in the Bohai Sea demonstrate a coupling relationship with the uplift of the Qinghai Tibet Plateau, glacial-interglacial cycles, and integration of the Yellow River. This study traces the initial transgression in the Bohai Sea to 1.35 Ma and provides a new detailed evolutionary model of the timing and routes for the Quaternary transgression of the Bohai Sea and Yellow Sea, thereby enhancing our understanding of sedimentary evolution and paleoenvironmental changes in the region.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"657 ","pages":"Article 112602"},"PeriodicalIF":2.6,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Paleoenvironmental evolution and East Asian monsoon records through three stages of paleochannels since the mid-pleistocene in the Western Bohai Sea, North China 华北渤海西部更新世中期以来古环境演化和三个阶段古河道的东亚季风记录
IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL Pub Date : 2024-11-12 DOI: 10.1016/j.palaeo.2024.112603
Shuyu Wu , Jun Liu , Hongxian Chu , Yongcai Feng , Meiling Yin , Lixin Pei
Three stages of paleochannels development, dating back to the Mid-Pleistocene, have been identified in the western Bohai Sea (BS) region. However, the factors controlling their sedimentary formation remain unclear. This study analyzed samples from DZQ01 and adjacent boreholes to establish a chronological framework through AMS 14C and OSL dating, complemented by grain size and geochemical analyses. End-member analysis using the Generalized Weibull method successfully separated three components: EM1, EM2, and EM3. EM3 (<26.28 μm) reflects the influence of the East Asian Summer Monsoon (EASM), while EM2 (26.28–105.1 μm) is indicative of the East Asian Winter Monsoon (EAWM). Geochemical indicators, such as the Rb/Sr ratio, reflect the impact of paleoclimatic changes. This study identified five major glaciation events since the Mid-Pleistocene. The DU6 unit recorded two glacial stages (300–272 cal. ka B.P.), characterized by a weakened EASM and a stronger EAWM. Similarly, the DU4 unit recorded two glacial stages (165–127 cal. ka B.P.), also marked by a subdued EASM and an enhanced EAWM. The DU2 unit reflects a prolonged glacial stages (71–14 cal. ka B.P.), dominated by the EAWM, resulting in cold and dry conditions. Overall, the uplift of the Tibetan Plateau and sea-level fluctuation significantly influenced the formation and evolution of paleochannels, with the sedimentary characteristics closely tied to the intensities of the East Asian Monsoon (EAM).
渤海(BS)西部地区古河道的三个发展阶段可追溯到中更新世。然而,控制其沉积形成的因素仍不清楚。本研究分析了来自 DZQ01 和邻近钻孔的样品,通过 AMS 14C 和 OSL 测定,并辅以粒度和地球化学分析,建立了年代学框架。采用广义威布尔法进行的末端成分分析成功地分离出三个成分:EM1、EM2 和 EM3。EM3(26.28 μm)反映了东亚夏季季风(EASM)的影响,而 EM2(26.28-105.1 μm)则表明了东亚冬季季风(EAWM)的影响。地球化学指标,如 Rb/Sr 比率,反映了古气候变化的影响。这项研究确定了自中新世以来的五次主要冰川事件。DU6单元记录了两个冰川阶段(公元前300-272 ka.P.),其特点是EASM减弱,EAWM增强。同样,DU4 单元记录了两个冰川期(公元前 165-127 卡),其特征也是 EASM 减弱,EAWM 增强。DU2 单元反映了一个漫长的冰川期(公元前 71-14 千年),以 EAWM 为主,造成了寒冷和干燥的条件。总体而言,青藏高原的隆升和海平面的波动极大地影响了古河道的形成和演化,其沉积特征与东亚季风的强度密切相关。
{"title":"Paleoenvironmental evolution and East Asian monsoon records through three stages of paleochannels since the mid-pleistocene in the Western Bohai Sea, North China","authors":"Shuyu Wu ,&nbsp;Jun Liu ,&nbsp;Hongxian Chu ,&nbsp;Yongcai Feng ,&nbsp;Meiling Yin ,&nbsp;Lixin Pei","doi":"10.1016/j.palaeo.2024.112603","DOIUrl":"10.1016/j.palaeo.2024.112603","url":null,"abstract":"<div><div>Three stages of paleochannels development, dating back to the Mid-Pleistocene, have been identified in the western Bohai Sea (BS) region. However, the factors controlling their sedimentary formation remain unclear. This study analyzed samples from DZQ01 and adjacent boreholes to establish a chronological framework through AMS <sup>14</sup>C and OSL dating, complemented by grain size and geochemical analyses. End-member analysis using the Generalized Weibull method successfully separated three components: EM1, EM2, and EM3. EM3 (&lt;26.28 μm) reflects the influence of the East Asian Summer Monsoon (EASM), while EM2 (26.28–105.1 μm) is indicative of the East Asian Winter Monsoon (EAWM). Geochemical indicators, such as the Rb/Sr ratio, reflect the impact of paleoclimatic changes. This study identified five major glaciation events since the Mid-Pleistocene. The DU6 unit recorded two glacial stages (300–272 cal. ka B.P.), characterized by a weakened EASM and a stronger EAWM. Similarly, the DU4 unit recorded two glacial stages (165–127 cal. ka B.P.), also marked by a subdued EASM and an enhanced EAWM. The DU2 unit reflects a prolonged glacial stages (71–14 cal. ka B.P.), dominated by the EAWM, resulting in cold and dry conditions. Overall, the uplift of the Tibetan Plateau and sea-level fluctuation significantly influenced the formation and evolution of paleochannels, with the sedimentary characteristics closely tied to the intensities of the East Asian Monsoon (EAM).</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"656 ","pages":"Article 112603"},"PeriodicalIF":2.6,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A dual bivalve approach for interpreting past sea surface temperatures and seasonality from shell midden sites using oxygen isotope sclerochronology 利用氧同位素年代学从贝壳冢遗址解读过去海面温度和季节性的双壳方法
IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL Pub Date : 2024-11-12 DOI: 10.1016/j.palaeo.2024.112585
Sarah D. Kuehn, Meghan Burchell, Natasha Leclerc
Stable oxygen isotope (δ18O) analysis of archaeological shellfish remains combined with sclerochronology can be used to precisely reconstruct past sea surface temperature (pSST), season(s) of shellfish collection, and thus the season(s) of archaeological site occupation. Our study tests if δ18Oshell and sclerochronological analyses of marine bivalve species Leukoma staminea – with previously unassessed seasonality and pSST potential – can provide additional insights not captured by the better studied species, Saxidmous gigantea in British Columbia (BC, Canada). We analyzed live-collected L. staminea and S. gigantea shells from Sechelt, BC, and compared results to archaeological shell data from Powell River, BC, in the territory of the Tla'amin First Nation (1065 to 797 cal. B.P.). The seasonality of shellfish harvest differed between species, with S. gigantea preferentially collected in the spring, whereas L. staminea collected year-round. This highlights that sole-species seasonality studies may miss important variability in harvesting strategies. Additionally, comparisons between instrumental (5.7 to 20.4 °C) and reconstructed SST from modern L. staminea δ18Oshell (5.6 to 18.4 °C) showed good agreement in annual range. Our results indicate that archaeological S. gigantea record a wider range of pSST (−1.6 to 22.9 °C) than archaeological L. staminea (5.8 to 25.9 °C), suggesting that S. gigantea may be a more sensitive palaeotemperature recorder. Further, we found that using the same reconstructed δ18Owater value for both species in pSST reconstruction caused an overestimation of temperature. Accordingly, we argue that it is critical to calibrate the equation with corresponding species-specific δ18Oshell values, regardless of both having aragonite mineral structures. Our study highlights the potential of L. staminea to broaden seasonality interpretations while clarifying that its use for pSST reconstruction may not capture the lower range of temperature.
对考古贝类遗骸进行稳定氧同位素(δ18O)分析并结合clerochronology,可用于精确重建过去的海面温度(pSST)、贝类采集季节,进而重建考古遗址的占用季节。我们的研究测试了对海洋双壳贝类 Leukoma staminea 的 δ18Oshell 和clerochronological 分析(以前未评估过季节性和 pSST 潜力)是否能提供不列颠哥伦比亚省(加拿大不列颠哥伦比亚省)的 Saxidmous gigantea 等研究得较好的贝类所无法提供的更多信息。我们分析了从不列颠哥伦比亚省塞切特(Sechelt)现场采集的 L. staminea 和 S. gigantea 贝壳,并将结果与不列颠哥伦比亚省鲍威尔河(Tla'amin First Nation,公元前 1065 至 797 年)的考古贝壳数据进行了比较。不同物种收获贝类的季节性不同,S. gigantea 贝类偏好在春季采集,而 L. staminea 贝类则全年采集。这突出表明,单一物种的季节性研究可能会忽略捕捞策略的重要变化。此外,通过比较仪器数据(5.7-20.4 °C)和现代 L. staminea δ18Oshell(5.6-18.4 °C)重建的 SST,结果表明两者的年变化范围非常一致。我们的研究结果表明,与考古学上的 L. staminea(5.8 至 25.9 °C)相比,考古学上的 S. gigantea 记录的 pSST 范围更广(-1.6 至 22.9 °C),这表明 S. gigantea 可能是一种更灵敏的古温度记录器。此外,我们还发现,在重建 pSST 时,对两个物种使用相同的重建δ18O 水值会导致温度的高估。因此,我们认为,无论两个物种是否都具有文石矿物结构,都必须用相应物种的δ18Oshell值来校准方程。我们的研究强调了L. staminea在扩大季节性解释方面的潜力,同时也澄清了将其用于pSST重建可能无法捕捉到较低的温度范围。
{"title":"A dual bivalve approach for interpreting past sea surface temperatures and seasonality from shell midden sites using oxygen isotope sclerochronology","authors":"Sarah D. Kuehn,&nbsp;Meghan Burchell,&nbsp;Natasha Leclerc","doi":"10.1016/j.palaeo.2024.112585","DOIUrl":"10.1016/j.palaeo.2024.112585","url":null,"abstract":"<div><div>Stable oxygen isotope (δ<sup>18</sup>O) analysis of archaeological shellfish remains combined with sclerochronology can be used to precisely reconstruct past sea surface temperature (pSST), season(s) of shellfish collection, and thus the season(s) of archaeological site occupation. Our study tests if δ<sup>18</sup>O<sub>shell</sub> and sclerochronological analyses of marine bivalve species <em>Leukoma staminea</em> – with previously unassessed seasonality and pSST potential – can provide additional insights not captured by the better studied species, <em>Saxidmous gigantea</em> in British Columbia (BC, Canada). We analyzed live-collected L. <em>staminea</em> and <em>S. gigantea</em> shells from Sechelt, BC, and compared results to archaeological shell data from Powell River, BC, in the territory of the Tla'amin First Nation (1065 to 797 cal. B.P.). The seasonality of shellfish harvest differed between species, with <em>S. gigantea</em> preferentially collected in the spring, whereas L. <em>staminea</em> collected year-round. This highlights that sole-species seasonality studies may miss important variability in harvesting strategies. Additionally, comparisons between instrumental (5.7 to 20.4 °C) and reconstructed SST from modern L. <em>staminea</em> δ<sup>18</sup>O<sub>shell</sub> (5.6 to 18.4 °C) showed good agreement in annual range. Our results indicate that archaeological <em>S. gigantea</em> record a wider range of pSST (−1.6 to 22.9 °C) than archaeological L. <em>staminea</em> (5.8 to 25.9 °C), suggesting that <em>S. gigantea</em> may be a more sensitive palaeotemperature recorder. Further, we found that using the same reconstructed δ<sup>18</sup>O<sub>water</sub> value for both species in pSST reconstruction caused an overestimation of temperature. Accordingly, we argue that it is critical to calibrate the equation with corresponding species-specific δ<sup>18</sup>O<sub>shell</sub> values, regardless of both having aragonite mineral structures. Our study highlights the potential of L. <em>staminea</em> to broaden seasonality interpretations while clarifying that its use for pSST reconstruction may not capture the lower range of temperature.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"657 ","pages":"Article 112585"},"PeriodicalIF":2.6,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Post-Marinoan paleoredox and paleoproductivity record in Puga cap carbonate: Implication for coastal life colonization at the Amazon Craton marginal Sea Puga cap碳酸盐中的后Marinoan古氧化还原和古生产率记录:亚马逊克拉通边缘海沿岸生物殖民化的影响
IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL Pub Date : 2024-11-10 DOI: 10.1016/j.palaeo.2024.112600
Renan F. dos Santos , Pierre Sansjofre , Afonso C.R. Nogueira , Simon V. Hohl , Marlone H.H. Bom , Ailton S. Brito , Flavia Callefo , Stefan V. Lalonde
The geochemical signatures in cap carbonate successions are critical records of paleoceanographic conditions following Snowball Earth events. These deposits offer insight into the shifts in redox conditions and the re-establishment of biogeochemical cycles during postglacial periods, providing a window into the evolving marine environments and potential drivers of early oxygenation. To track redox changes during this transition, we present improved high-resolution analyses of redox proxies across Puga cap carbonate (∼ 635 Ma) on the Southern Amazon Craton, Brazil, allowing for the identification of temporal redox transitions during the post-Marinoan transgression. The depletion of trace elements, particularly redox-sensitive elements (RSEs), such as Mo, U, and V in microbialites formed in basal cap dolostone, was deposited under oxic conditions. Following the initial melting of Marinoan glaciers, microbial mats flourished and grew in a semi-restricted shallow marine environment in the coastal paleoenvironment along the Amazon cratonic margin, where nutrient-rich surface waters fueled primary productivity. In contrast, the increase in RSEs in upper wave-dominated dolostone facies indicates predominantly dysoxic conditions in continuous sea level rise, resulting in the drowning of these early microbial environments and the precipitation of cap limestones. The sequential oxic-dysoxic redox marks the transition from shallow sea to deepening CaCO3-oversaturated platform conditions. These results demonstrate an unequivocal synchronous relationship between the initial oxygenation of the Amazon margin and the local microbial mat flourishment shortly after the Marinoan glaciation.
帽状碳酸盐岩层中的地球化学特征是雪球地球事件之后古海洋学条件的重要记录。这些沉积物有助于人们深入了解冰川期后氧化还原条件的变化和生物地球化学循环的重建,为人们了解不断演变的海洋环境和早期含氧的潜在驱动因素提供了一个窗口。为了追踪这一过渡时期的氧化还原变化,我们对巴西南亚马孙克拉通的普加帽碳酸盐岩(635 Ma)进行了改进的高分辨率氧化还原代用指标分析,从而确定了后玛利诺横断期间的时间氧化还原过渡。微量元素,特别是氧化还原敏感元素(RSEs),如基底盖白云岩中形成的微生物岩中的钼、铀和钒,是在缺氧条件下沉积的。在马里诺冰川最初融化之后,微生物垫在亚马孙板块边缘沿海古环境的半封闭浅海环境中蓬勃生长,富含营养的表层水促进了初级生产力。与此相反,上波浪为主的白云岩岩层中 RSE 的增加表明,在海平面持续上升的情况下,主要是缺氧条件,导致这些早期微生物环境被淹没,帽状石灰岩沉淀。氧化-缺氧的顺序氧化还原标志着从浅海向不断加深的 CaCO3 过饱和平台条件的过渡。这些结果表明,亚马逊河边缘最初的富氧与马里诺冰川期后不久当地微生物垫的繁荣之间存在明确的同步关系。
{"title":"Post-Marinoan paleoredox and paleoproductivity record in Puga cap carbonate: Implication for coastal life colonization at the Amazon Craton marginal Sea","authors":"Renan F. dos Santos ,&nbsp;Pierre Sansjofre ,&nbsp;Afonso C.R. Nogueira ,&nbsp;Simon V. Hohl ,&nbsp;Marlone H.H. Bom ,&nbsp;Ailton S. Brito ,&nbsp;Flavia Callefo ,&nbsp;Stefan V. Lalonde","doi":"10.1016/j.palaeo.2024.112600","DOIUrl":"10.1016/j.palaeo.2024.112600","url":null,"abstract":"<div><div>The geochemical signatures in cap carbonate successions are critical records of paleoceanographic conditions following Snowball Earth events. These deposits offer insight into the shifts in redox conditions and the re-establishment of biogeochemical cycles during postglacial periods, providing a window into the evolving marine environments and potential drivers of early oxygenation. To track redox changes during this transition, we present improved high-resolution analyses of redox proxies across Puga cap carbonate (∼ 635 Ma) on the Southern Amazon Craton, Brazil, allowing for the identification of temporal redox transitions during the post-Marinoan transgression. The depletion of trace elements, particularly redox-sensitive elements (RSEs), such as Mo, U, and V in microbialites formed in basal cap dolostone, was deposited under oxic conditions. Following the initial melting of Marinoan glaciers, microbial mats flourished and grew in a semi-restricted shallow marine environment in the coastal paleoenvironment along the Amazon cratonic margin, where nutrient-rich surface waters fueled primary productivity. In contrast, the increase in RSEs in upper wave-dominated dolostone facies indicates predominantly dysoxic conditions in continuous sea level rise, resulting in the drowning of these early microbial environments and the precipitation of cap limestones. The sequential oxic-dysoxic redox marks the transition from shallow sea to deepening CaCO<sub>3</sub>-oversaturated platform conditions. These results demonstrate an unequivocal synchronous relationship between the initial oxygenation of the Amazon margin and the local microbial mat flourishment shortly after the Marinoan glaciation.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"657 ","pages":"Article 112600"},"PeriodicalIF":2.6,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
Palaeogeography, Palaeoclimatology, Palaeoecology
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1