Cretaceous Research最新文献_第7页

Early Cretaceous freshwater bivalves from northeastern Brazil: Insights into the evolutionary history of South American freshwater mussels 巴西东北部早白垩世淡水双壳类：对南美淡水贻贝进化史的洞察

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-08-28 DOI: 10.1016/j.cretres.2025.106212

Victor R. Silva , Vitor B. Guerrini , Filipe G. Varejão , Rafael C. Silva , Katie Collins , Ismar S. Carvalho , Simon Schneider , Marcello G. Simões

We revise and describe the Early Cretaceous (Berriasian to Albian) freshwater bivalves from northeastern Brazil, including representatives of Unionida, Trigoniida, and potentially Sphaeriida. Three genera previously thought to be endemic to the Aptian to Albian Crato and Romualdo formations, Araripe Basin, Ceará State, i.e. Cratonaia, Araripenaia, and Monginellopsis, are now recorded from other interior basins. The Berriasian to Barremian Mont Serrat Conglomerate (Salvador Formation) of the Recôncavo Basin, Bahia State, hosts a diverse Unionida-dominated fauna, including Mycetopoda, Anodontites?, Cratonaia, and potentially also hyriids. Specimens tentatively assigned to the neomiodontid Musculiopsis also occur. This fauna has mixed Gondwanan and Laurasian affinities and likely thrived in ephemeral streams and/or floodplain lakes. Araripenaia is recorded from the Aptian Marizal Formation of the Tucano Basin. Supposed representatives of Sphaerium from the same strata are clam shrimps (Diplostraca). Cratonaia and Monginellopsis occur in the Aptian-Albian Itapecuru Formation of the Parnaíba Basin, Maranhão State. Articulated shells of Cratonaia, Araripenaia, and Monginellopsis are typically associated with fluvial-lacustrine deposits. Their common occurrence in Aptian-Albian strata of northeastern Brazil suggests dispersal via fluvial systems connecting the different sedimentary basins. These northeastern Brazilian assemblages are distinct from those of the Upper Cretaceous Bauru Basin in southeastern Brazil. Despite South America and North Africa being connected for most of the Early Cretaceous, no shared freshwater bivalves are known. The newly described faunas provide insight into South American Early Cretaceous freshwater mussel diversity when the proto-South Atlantic was dominated by alluvial and lacustrine settings hosting abundant but poorly known freshwater bivalves.

我们对巴西东北部早白垩世（Berriasian - Albian）淡水双壳类进行了修正和描述，包括Unionida、Trigoniida和Sphaeriida的代表。以前被认为是阿普tian到Albian克拉托和Romualdo组，Araripe盆地，cerar State特有的三个属，即Cratonaia， Araripenaia和Monginellopsis，现在从其他内陆盆地记录下来。巴伊亚州Recôncavo盆地的Berriasian - Barremian Mont Serrat砾岩（Salvador组）拥有多种以unionida为主的动物群，包括足类动物、Anodontites？克拉通那亚，也可能是混血儿。也出现了暂定为新齿纲肌肉纲的标本。这种动物混合了冈瓦纳和劳拉的亲缘关系，可能在短暂的溪流和/或洪泛区湖泊中繁衍生息。Araripenaia记录于Tucano盆地Aptian Marizal组。假定来自同一地层的球形目的代表是蛤虾（蛤虾属）。Cratonaia和Monginellopsis发生在马拉州Parnaíba盆地的Aptian-Albian Itapecuru组。克拉通、Araripenaia和Monginellopsis的铰接壳通常与河流-湖泊沉积有关。它们在巴西东北部Aptian-Albian地层中普遍存在，表明它们是通过连接不同沉积盆地的河流系统传播的。这些巴西东北部的组合与巴西东南部的上白垩纪Bauru盆地的组合不同。尽管在早白垩纪的大部分时间里，南美洲和北非是相连的，但没有已知的淡水双壳类动物。新描述的动物群提供了对南美早白垩世淡水贻贝多样性的深入了解，当时原南大西洋由冲积和湖泊环境主导，拥有丰富但鲜为人知的淡水双壳类。

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引用次数: 0

From the inside: Pathologies from a histological perspective of two elasmosaurids from the Upper Cretaceous of Antarctica and Argentina 从内部看：从组织学角度看来自南极洲和阿根廷上白垩纪的两只依拉丝龙的病理学

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-08-22 DOI: 10.1016/j.cretres.2025.106208

Matias Mitidieri , Marianella Talevi , Yanina Herrera , Bruce Rothschild , Marta S. Fernández

Histopathology plays a fundamental role in the detailed analysis of various pathologies, as it allows for diagnosing diseases through microscopic examination of the affected tissues. These studies on Mesozoic marine reptiles are scarce, and almost non-existent in plesiosaurs. Here, two elasmosaurid plesiosaur specimens were examined: specimen MLP-PV 93-I-5-1, recovered from the lower Maastrichtian Snow Hill Island Formation (Vega Island, Antarctica), and specimen MML-PV 5, retrieved from the upper Maastrichtian Jagüel Formation (Salinas de Trapalcó, Río Negro). To obtain the histological sections, a fragmented rib was selected from the first specimen; and a transverse process, dorsal rib, and phalanx were chosen from the second. Pathological bone callus was observed on the rib sections of MLP-PV 93-I-5-1. Periosteal growth perpendicular to the long axis of the bone was observed on the transverse process, dorsal rib, and phalanx sections of MML-PV 5. The characteristics observed in specimen MLP-PV 93-I-5-1 are consistent with the diagnosis of a healing fracture. The characteristics observed in specimen MML-PV 5 are indicative of periostitis. Based on the histopathological study of the two elasmosaurid specimens, it was possible to identify abnormal internal variations in bone tissue and determine that both pathologies developed during the life of the elasmosaurids.

组织病理学在各种病理的详细分析中起着基本的作用，因为它允许通过显微镜检查受影响的组织来诊断疾病。这些关于中生代海洋爬行动物的研究很少，关于蛇颈龙的研究几乎没有。本文研究了两个依拉丝模龙蛇颈龙标本，分别是来自马斯特拉赫特下雪山岛组（Vega Island, Antarctica）的MLP-PV 93- i -5和来自马斯特拉赫特上部jag el组（Salinas de Trapalcó， Río Negro）的MML-PV 5。为了获得组织学切片，从第一个标本中选择了一根破碎的肋骨；而横突，背肋骨和指骨则是从第二处选取的。MLP-PV 93-I-5-1肋骨切片可见病理性骨痂形成。在MML-PV 5的横突、背肋和指骨切片上观察到垂直于骨长轴的骨膜生长。在标本MLP-PV 93-I-5-1中观察到的特征与骨折愈合的诊断一致。在标本MML-PV 5中观察到的特征表明骨膜炎。根据对这两种骨模龙标本的组织病理学研究，可以识别出骨组织的异常内部变异，并确定这两种病理都是在骨模龙的一生中发展起来的。

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引用次数: 0

Integrated carbon isotope stratigraphy and biostratigraphy of Cenomanian to Turonian carbonates from Jordan – An updated age model and sequence stratigraphic correlations with Oman 约旦塞诺曼—土鲁期碳酸盐岩的综合碳同位素地层学和生物地层学——更新的年龄模型和与阿曼的层序地层对比

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-08-05 DOI: 10.1016/j.cretres.2025.106207

Tojo Chirakal , Jihede Haj Messaoud , Ali Alibrahim , Khalil Ibrahim , Carine Grélaud , Amir Kalifi , John H. Powell , Frans van Buchem

A new integrated age model of the uppermost Albian to Coniacian Ajlun Group in West-Central Jordan is presented based on four complete outcrop sections along a ∼124 km N–S transect. Carbon isotope curves from this work are integrated with published carbon isotope data and constrained by new and existing nannofossil and ammonite biostratigraphy. Key identified carbon isotope events include the Mid-Cenomanian Event 1 (MCE 1), the Oceanic Anoxic Event 2 (OAE 2) at the Cenomanian/Turonian boundary and the Pewsey Event in the middle Turonian. The findings of this study corroborate and revise previous chemostratigraphic definitions in the study area, while also demonstrating a coeval origin of different lithostratigraphic units within the Ajlun Group. On the Arabian Plate scale, a detailed (3rd order) sequence stratigraphic correlation is made between Jordan and time-equivalent strata from the well-studied Natih Formation in Oman. These correlations help to evaluate the relative contributions of eustasy and tectonics on different plate tectonic settings, since the northeastern and eastern margins were heavily influenced by tectonic processes associated with the closure of the Neo-Tethys Ocean. In Oman, the creation of increased accommodation space (ca. 40 m) is observed relative to Jordan commencing in the interval between the MCE 1 and OAE 2. This suggests the onset of tectonic precursor events in Oman during the middle to late Cenomanian interval before the main tectonic phase in the Turonian, resulting in the termination of shallow water carbonate deposition. In contrast, Jordan remained in a largely passive margin setting.

基于沿N-S ~ 124 km的4个完整的露头剖面，提出了约旦中西部阿尔卑统至Coniacian Ajlun群的一个新的综合年龄模型。碳同位素曲线与已发表的碳同位素数据相结合，并受到新的和现有的纳米化石和菊石生物地层学的限制。关键的碳同位素事件包括Cenomanian Event 1 （MCE 1）、Cenomanian/Turonian边界的Oceanic缺氧Event 2 （OAE 2）和Turonian mid的Pewsey Event。本研究的发现证实和修正了研究区以往的化学地层学定义，同时也证明了阿基伦群内不同岩石地层单元的形成是同时期的。在阿拉伯板块尺度上，对约旦与阿曼Natih组时间等效地层进行了详细的（三级）层序地层对比。这些相关性有助于评估不同板块构造背景下的地壳运动和构造的相对贡献，因为东北和东部边缘受到与新特提斯洋闭合相关的构造过程的严重影响。在阿曼，与约旦相比，在MCE 1和OAE 2之间的间隔开始增加了住宿空间（约40米）。这表明阿曼的构造前驱事件发生在塞诺曼期中晚期，早于Turonian期主构造期，导致浅水碳酸盐岩沉积终止。相比之下，约旦在很大程度上处于被动的边缘地位。

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引用次数: 0

Revision of mid-Cretaceous Peltoperlidae (Insecta: Plecoptera) from Burmese amber, with description of two new species in a new genus 中白垩世缅甸琥珀Peltoperlidae的修正（昆虫亚目：翅翅目），附一新属两新种描述

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-08-05 DOI: 10.1016/j.cretres.2025.106206

Zhi-Teng Chen , Pavel Sroka , Thomas van de Kamp , Arnold H. Staniczek

This study delves into the taxonomy of the stonefly family Peltoperlidae known from mid-Cretaceous Burmese amber. Based on a broad survey, the fossil family Petroperlidae Sroka, Staniczek & Kondratieff, 2018 is herein considered as a subfamily (Petroperlinae stat. nov.) within Peltoperlidae; and the subfamily Borisoperlinae Chen and Xu, 2020 syn. nov. is synonymized with Petroperlinae stat. nov. The diagnostic characters of all genera of Petroperlinae stat. nov. are revised and summarized. In addition, two new petroperline stoneflies, Graciloperla bulbosa gen. et sp. nov. and Graciloperla stylata gen. et sp. nov., are described based on male adults, which exhibit well-preserved aedeagal structures, the first known for fossil Peltoperlidae.

本研究探讨了中白垩纪缅甸琥珀中已知的石蝇科Peltoperlidae的分类。根据广泛的调查，化石科Petroperlidae Sroka， Staniczek & & & Kondratieff， 2018被认为是Peltoperlidae中的一个亚科（Petroperlinae stat. 11 .）；Chen and Xu, 2020 syn11 .与Petroperlinae stat. 11同义。对Petroperlinae stat. 11各属的诊断特征进行了修订和总结。此外，本文还描述了两种新的石蝇，Graciloperla bulbosa gen. et sp. nov.和Graciloperla stylata gen. et sp. nov.，这两种石蝇基于雄性成虫，它们具有保存完好的aedeagal结构，这是在Peltoperlidae化石中首次发现的。

引用次数: 0

Hybodont shark remains from Campanian (Upper Cretaceous) continental deposits of southern France 法国南部坎帕尼亚（上白垩纪）大陆沉积物中的海蛇鲨残骸

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-07-21 DOI: 10.1016/j.cretres.2025.106205

Xavier Valentin , Romain Vullo , Gilles Cuny , Olivier Jansen , Géraldine Garcia

The hybodont shark (Elasmobranchii, Hybodontiformes) material from the Campanian of two non-marine localities in southern France are described. Some teeth and a dorsal fin spine from the upper Campanian of Velaux are assigned to the genus Meristodonoides (Hybodontidae), whereas a single tooth from the lower Campanian of Villeveyrac is referred to Parvodus (Lonchidiidae), a genus hitherto unknown in the Upper Cretaceous. Among the latest Cretaceous continental ichthyofaunas of the European archipelago, hybodont sharks may have been minor relictual components with spatially restricted distributions, as suggested by their scarcity in the fossil assemblages from France and Romania combined with their apparent absence in other areas (Iberian Peninsula, Hungary).

描述了在法国南部两个非海洋地区的坎帕尼亚区发现的蛇齿鲨（Elasmobranchii，蛇齿鲨目）材料。来自Velaux上坎帕尼亚纪的一些牙齿和一根背鳍脊柱被归为Meristodonoides属（Hybodontidae），而来自Villeveyrac下坎帕尼亚纪的一颗牙齿被归为Parvodus (Lonchidiidae)，这是一个在上白垩纪迄今未知的属。在欧洲群岛最新的白垩纪大陆鱼系中，水下齿鲨可能是较小的宗教成分，其分布空间有限，这表明它们在法国和罗马尼亚的化石组合中稀缺，而在其他地区（伊比利亚半岛，匈牙利）则明显缺失。

引用次数: 0

Sea-level and paleoenvironmental changes revealed by benthic foraminifera across Oceanic Anoxic Event 2 (OAE 2) at Eastbourne (SE England) 英国伊斯特本海洋缺氧事件2 （OAE 2）中底栖有孔虫揭示的海平面和古环境变化

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-07-19 DOI: 10.1016/j.cretres.2025.106204

Giulia Amaglio , Maria Rose Petrizzo , Francesca Falzoni , Ann Holbourn , Wolfgang Kuhnt

The Cenomanian–Turonian Oceanic Anoxic Event 2 (OAE 2) severely disrupted the global carbon cycle with widespread deposition of organic-rich marine sediments, resulting in a positive carbon isotope excursion. The Eastbourne section in southeastern England offers extensive benthic and planktonic foraminiferal data, revealing four distinct paleoenvironmental intervals across OAE 2.

The Grey Chalk interval below OAE 2, which is characterized by the highest species diversity of benthic foraminifera, represents outer neritic-upper bathyal paleodepths, oxygenated environments and low organic fluxes at the seafloor. Deep- and thermocline-dwelling planktonic foraminifera suggest meso-oligotrophic regimes with a well-stratified water column.

The onset of OAE 2 in Bed 1a of the Plenus Marl is marked by a sea-level fall supported by the maximum peak in abundance of shallow water agglutinated foraminifera (Ataxophragmium depressum, Arenobulimina, Plectina cenomana) and by the disappearance of bathyal taxa (e.g., Tristix excavata, Kalamopsis grzybowsky).

In Bed 1b of the Plenus Marl, corresponding to the onset of the Plenus Cold Event, Eggerellina, Gaudryina, and Textularia replace shallow agglutinated taxa indicating a transgressive phase. This assemblage also coincides with the occurrence of Boreal planktonic foraminifera that suggests the incursion of Boreal waters into the Anglo-Paris Basin.

The White Chalk, in the upper part and the interval above OAE 2, is interpreted as a Transgressive and Highstand Systems Tract with a change in the benthic foraminiferal assemblage towards the dominance of Marssonella, Gavelinella, Lingulogavelinella and Tritaxia with warmer and more mesotrophic waters recorded by the dominance of Tethyan planktonic foraminifera.

Cenomanian-Turonian Oceanic Anoxic Event 2 （OAE 2）严重破坏了全球碳循环，富有机质海洋沉积物广泛沉积，导致碳同位素正偏移。英格兰东南部的伊斯特本剖面提供了广泛的底栖生物和浮游有孔虫数据，揭示了OAE 2中四个不同的古环境区间。OAE 2以下的灰色白垩层段是底栖有孔虫物种多样性最高的层段，代表了浅海-上深海古深度、含氧环境和海底低有机通量。生活在深海和温坡的浮游有孔虫表明具有分层良好的水柱的中贫营养状态。在Plenus marle 1a层，OAE 2的发生以海平面下降为标志，而海平面下降是由浅水聚集有孔虫（Ataxophragmium洼地，Arenobulimina, Plectina cenomana）丰度的最大峰值支撑的，而深海分类群（如Tristix excavata， Kalamopsis grzybowsky）的消失为标志。在正珥海泥沼1b层，与正珥冷事件的发生相对应，Eggerellina、Gaudryina和texularia取代了浅层凝集类群，显示了海侵期。这种组合也与北方浮游有孔虫的出现相吻合，这表明北方水域侵入了盎格鲁-巴黎盆地。在OAE 2的上部和以上区间，White Chalk被解释为海侵和高水位系统域，底栖有孔虫组合向Marssonella、Gavelinella、Lingulogavelinella和Tritaxia为主变化，并且以特提斯浮游有孔虫为主，记录了更温暖和更多的中营养化水域。

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引用次数: 0

Astrochronology of the terrestrial mid-Cretaceous Quantou and Denglouku formations in the SK-3 borehole from the Songliao Basin, Northeastern China 松辽盆地SK-3井陆相中白垩统泉头组和登楼库组天体年代学

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-07-19 DOI: 10.1016/j.cretres.2025.106201

Shan Li , Huaichun Wu , Qiang Fang , Runjian Chu , Meinan Shi , Guang Yang , Yuan Gao , Xiaojuan Ma , Youfeng Gao , Chengshan Wang

The continental scientific drilling borehole Songke 3 (SK-3) in the Songliao Basin, Northeastern China, recovers a continuous mid-Cretaceous stratigraphic record which offers a unique opportunity to study terrestrial climate and environmental change. In this study, high-resolution gamma-ray (GR) data were utilized as a paleoclimate proxy to conduct the cyclostratigraphic analysis of the Quantou Formation (K₂q) and Denglouku Formation (K₂d) within the SK-3 borehole. The cyclic variations in GR values, which reflect fluctuating clay influxes, document Cretaceous Milankovitch cycles including the 405-kyr long eccentricity, ∼100-kyr short eccentricity, ∼38-kyr obliquity, and ∼20-kyr precession cycles. Astronomical tuning of GR data series to the 405-kyr and 100-kyr eccentricity cycles yields an 8.89 ± 0.32 Myr duration for the K₂d² to K₂q interval at SK-3. Based on the age of 91.81 ± 0.22 Ma at the boundary of Qingshankou (K₂qn) and K₂q formations derived from Songke 1 south borehole (SK-1s), our newly constructed astronomical time scale (ATS) suggests that the Turonian/Cenomanian and Cenomanian/Albian boundaries are at the depth ∼1055.5 m within the mid-K₂q³ and ∼2350 m within the lower K₂d², respectively. Our study also indicates the complex processes of the sedimentary system in response to the Milankovitch cycles. The eccentricity cycles are more effectively preserved in the lacustrine-deltaic facies. In contrast, both obliquity and precession cycles exhibit better preservation in the meandering river and braided river facies.

松辽盆地松科3号（SK-3）陆相科学钻孔恢复了连续的中白垩世地层记录，为研究陆相气候与环境变化提供了独特的机会。本文利用高分辨率伽玛射线（GR）资料作为古气候代用资料，对SK-3钻孔内泉头组（K2q）和登娄库组（K2d）进行了旋回地层分析。GR值的旋回变化反映了黏土流入的波动，记录了白垩纪Milankovitch旋回，包括405-kyr长偏心率、~ 100-kyr短偏心率、~ 38-kyr倾角和~ 20-kyr岁差旋回。将GR数据序列天文调谐到405-kyr和100-kyr的偏心周期，SK-3的K2d2至K2q区间的持续时间为8.89±0.32 Myr。根据松科1南钻孔（sk -1）青山口（K2qn）和K2q组边界的91.81±0.22 Ma年龄，我们新建立的天文时间尺度（ATS）表明，Turonian/Cenomanian和Cenomanian/Albian边界分别位于k2q3中部~ 1055.5 m和K2d2下部~ 2350 m深度。我们的研究还表明，沉积体系响应于米兰科维奇旋回的复杂过程。偏心率旋回在湖三角洲相中保存较好。曲流河相和辫状河相的倾角旋回和旋进旋回保存较好。

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引用次数: 0

Multi-proxy provenance study of sandstones from the northern Bohemian Cretaceous Basin (Germany, Czechia) focused on tourmaline, rutile and garnet 德国、捷克北部波西米亚白垩纪盆地砂岩多代物源研究重点为电气石、金红石和石榴石

IF 1.7 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-07-15 DOI: 10.1016/j.cretres.2025.106203

Andreas Gärtner , Birgit Niebuhr , H. Tim Breitfeld , Delia Rösel , Marlene C. Schulze , Markus Wilmsen

The Kreibitz-Zittau area (northern margin of the Bohemian Massif, Czech-German border region) exposes a ∼1000-m-thick Cenomanian–middle Coniacian succession of quartz arenites with high compositional but low textural maturity. Translucent heavy minerals are almost exclusively composed of zircon, tourmaline and rutile (Ø-ZTR maturity index of 91) with tourmaline predominating (average of 60 %). Zr-in-rutile temperatures document upper amphibolite-eclogite to granulite facies between 700 and 930 °C. Cr/Nb discrimination of rutile and geochemistry of tourmaline indicate that >95 % of these grains originate from Al-rich and Fe–Mg-poor metapelites. U–Pb-ages of detrital rutile show a distinct peak at 320–330 Ma. If present, garnets of the almandine–pyrope series are dominant. The 95 % predominance of Variscan U–Pb rutile ages in all samples and the high/ultrahigh temperatures of metamorphism exclude the Neoproterozoic greywackes and granitoids of the Lusatian Massif and the granitoids of the Jizera–Krkonoše Massif in the northeast as sources. Potential proto source rocks were high-grade metamorphic rocks similar to those today exposed within the gneissic-migmatitic Góry Sowie Massif, ca. 120 km east of the depositional area. Since the late Devonian, this massif was uplifted, reaching the surface in late Carboniferous times. Consequently, the widespread Permo–Carboniferous Variscan molasse is the major sediment source for the Cretaceous sandstones, which thus were deposited during at least their 2nd sedimentary cycle. The study shows that integrated approaches combining careful petrography, heavy mineral analyses, mineral-specific geochemistry and thermometry as well as U–Pb age dating with high-resolution stratigraphy are suited to solve complex provenance puzzles.

Kreibitz-Zittau地区（捷克-德国边境波希米亚地块北缘）暴露出一套~ 1000 m厚的Cenomanian-middle Coniacian石英砂岩序列，其成分高，但结构成熟度低。半透明重矿物几乎完全由锆石、电气石和金红石组成（Ø-ZTR成熟度指数为91），电气石占主导地位（平均60%）。金红石中的锆温度记录了上部角闪岩-榴辉岩-麻粒岩相在700 ~ 930℃之间。金红石的Cr/Nb鉴别和电气石的地球化学特征表明，95%的金红石颗粒来源于富al和贫fe - mg的变长岩。金红石碎屑的u - pb年龄在320 ~ 330 Ma有明显的峰值。如果存在，则以铝榴石-欧榴石系列石榴石为主。所有样品中95%的Variscan U-Pb金红石年龄优势和变质作用的高/超高温排除了东北地区芦田地块和Jizera-Krkonoše地块新元古代灰岩和花岗岩类的来源。潜在的原始烃源岩是与今天暴露在沉积区以东约120公里处的片麻质-混染岩Góry Sowie地块内的高等级变质岩相似的岩石。自泥盆纪晚期起，该地块隆起，于石炭世晚期到达地表。因此，广泛分布的二叠-石炭系Variscan molasse是白垩纪砂岩的主要沉积物来源，因此至少在其第二次沉积旋回中沉积。研究表明，结合仔细的岩石学、重矿物分析、矿物特定地球化学和温度测量以及高分辨率地层学的U-Pb年龄定年的综合方法适合解决复杂的物源难题。

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引用次数: 0

Review and chronostratigraphic calibration of the Barremian–lower Aptian ostracod and pollen/spores biozonations of South Atlantic rift lacustrine formations (Gabon, Congo, Angola): impact on West African-Northeast Brazilian basin correlations 南大西洋裂谷湖组（加蓬、刚果、安哥拉）巴雷米亚-下阿普提亚介形虫和花粉/孢子生物带的回顾和年代地层定标：对西非-巴西东北部盆地对比的影响

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-07-10 DOI: 10.1016/j.cretres.2025.106202

Nicoletta Buratti , Gérard Dupont

Geological syntheses conducted over the last ten years by TotalEnergies on South Atlantic rift basins have led to a reappraisal of the taxonomy and stratigraphy of lacustrine ostracods and terrestrial palynomorphs (spores, pollen) from the Barremian–lower Aptian of West Africa. The results of this revision, based on the acquisition and reinterpretation of data from 55 wells located in North Gabon, South Gabon, Congo and southern Angola-Kwanza basins, are summarized in this publication. The original ostracod and palynological stratigraphic charts have been significantly enhanced. For ostracods, five new zones and fifteen new subzones have been defined, completing the zonation. The taxonomic composition of the assemblages from the six former palynological zones has been clarified, and seven subzones have been described for the first time. Correlations between ostracod and spore-pollen zones of the West African margin, derived from the integration of Gabon and Congo data, have been established from bioevents now considered synchronous at rift basin scale. Their chronostratigraphic calibration, based on the latest International Chronostratigraphic Chart, is improved, supported by radiometric and isotopic data from Northeastern Brazil and the occurrence of distinctive palynomorphs, used as an indirect tool for extra-regional correlation. The present zonal scheme reveals remarkable correspondence between the distribution of ostracods and microfloras on both sides of the rift and reconciles the stratigraphic nomenclature used for the Barremian–lower Aptian in West Africa and Northeastern Brazil. This provides robust correlations between sedimentary formations of basins of the two conjugate margins, especially Recôncavo versus Gabon Interior Basin and South Gabon, Sergipe versus North Gabon, and in the south, Campos versus Kwanza.

在过去的十年里，TotalEnergies对南大西洋裂谷盆地进行了地质综合研究，对西非巴雷米亚-阿普提亚盆地的湖相介形类和陆生孢子类（孢子、花粉）的分类和地层进行了重新评估。根据对北加蓬、南加蓬、刚果和安哥拉南部- kwanza盆地55口井的数据采集和重新解释，此次修订的结果总结在本出版物中。原始介形类和孢粉地层图得到了显著增强。对于介形虫，已经定义了5个新的区域和15个新的亚区域，完成了分区。澄清了6个原孢粉带组合的分类组成，并首次描述了7个亚带。西非边缘介形虫带和孢子花粉带之间的相关性来源于加蓬和刚果数据的整合，已经从现在认为在裂谷盆地尺度上同步的生物事件中建立起来。他们的年代地层校准基于最新的国际年代地层图，并得到了来自巴西东北部的放射性和同位素数据的支持，以及作为区域外对比的间接工具的独特地貌的出现。目前的地带性方案表明，裂谷两侧介形类和微生物区系的分布具有显著的一致性，并与西非巴雷米亚-下阿普tian和巴西东北部使用的地层命名法相一致。这为两个共轭边缘盆地的沉积地层提供了强有力的相关性，特别是Recôncavo与加蓬内陆盆地和南加蓬，Sergipe与北加蓬，以及南部的Campos与Kwanza。

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引用次数: 0

Detrital zircon provenance of the Lower Cretaceous Shahezi Formation in the Songliao Basin, Northeast China: Insights from LA-ICP-MS U-Pb geochronology 松辽盆地下白垩统沙河子组碎屑锆石物源：LA-ICP-MS U-Pb年代学的启示

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-07-04 DOI: 10.1016/j.cretres.2025.106200

Xin Gao , Tiegang Li

The Songliao Basin, located in northeastern China, is one of the largest continental rift basins in East Asia. It preserves a nearly complete record of Cretaceous continental sedimentary records, providing insights into paleoclimatic, geodynamical, and tectonic processes in terrestrial systems during the Cretaceous Period. The Lower Cretaceous Shahezi Formation, deposited during the syn-rift stage of the Songliao Basin, consists of thick sequences of terrestrial clastic sediments. However, the provenance of the sediments and tectonic background during the deposition of the Shahezi Formation remain poorly understood. This study utilises U–Pb geochronology of detrital zircons from six sandstone samples collected from the Shahezi Formation as part of the International Continental Drilling Project SK-2 borehole in the Songliao Basin. The zircon age distributions reveal three dominant age clusters: ∼128–113 Ma, ∼184–159 Ma, and ∼247–216 Ma, indicating that the primary sediment source remained stable throughout deposition. These results suggest that the northern Great Xing’an Range was a significant sediment source, contributing to the Shahezi Formation at approximately 118–113 Ma.

松辽盆地位于中国东北部，是东亚最大的大陆裂谷盆地之一。它保存了几乎完整的白垩纪大陆沉积记录，为白垩纪时期陆地系统的古气候、地球动力学和构造过程提供了见解。下白垩统沙河子组沉积于松辽盆地同裂谷期，为一层厚的陆相碎屑沉积。但对沙河子组沉积时期的物源及构造背景尚不清楚。本研究利用松辽盆地国际大陆钻探项目SK-2钻孔收集的沙河子组6个砂岩样品的碎屑锆石U-Pb年代学研究。锆石年龄分布显示出3个主要的年龄群：~ 128 ~ 113 Ma、~ 184 ~ 159 Ma和~ 247 ~ 216 Ma，表明原始沉积源在沉积过程中保持稳定。这些结果表明，大兴安岭北部是一个重要的沉积源，约在118 ~ 113 Ma形成了沙河子组。

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