Palaeogeography, Palaeoclimatology, Palaeoecology最新文献_第6页

Recurrent catastrophic outburst floods in the Yarlung Tsangpo Gorge system: Chronology, magnitude, and climatic drivers 雅鲁藏布江流域周期性特大溃决洪水：年代学、震级和气候驱动因素

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-03-15 Epub Date: 2026-01-09 DOI: 10.1016/j.palaeo.2026.113553

Jiantao Xie , Na Yang , Jingran Zhang , Mengying He , Chaogang Zheng , Zhigang Zhang , Xinggong Kong , Zhijun Zhao , Xilin Cao

Catastrophic outburst floods from natural-dam failures are among Earth's most powerful landscape-sculpting agents, yet their long-term frequency and relationship with orbital-scale climate cycles remain poorly constrained. The Yarlung Tsangpo River in the eastern Himalaya provides an unparalleled setting to resolve this, but research has largely focused on Holocene events. Here, we extend this record into the deep past, presenting a comprehensive geomorphological and geochronological reconstruction of outburst floods extending back to ∼259 ka. We identify at least six distinct, high-magnitude outburst flood episodes based on field evidence of giant bars. Hydraulic modeling shows these events had colossal peak discharges ranging from 0.2 to 2.1 × 10⁶ m³/s. Robust single-grain post-infrared infrared stimulated luminescence (pIRIR) dating establishes a chronology securely linked to distinct clusters: an early series associated with Marine Isotope Stage (MIS) 8 and its termination (∼259 ka, <242 ka, and ∼ 232 ka), followed by major events at ∼115 ka (MIS 5d), ∼18 ka (MIS 2), and ∼ 11 ka (Latest Pleistocene). Crucially, the stratigraphic tight coupling of flood deposits with immediately overlying paleosols provides physical evidence that these catastrophic failures were synchronous with rapid climatic transitions. This confirms a systematic causal mechanism: the advance of valley glaciers during cold stages (e.g., MIS 8, MIS 6, MIS 2) repeatedly dammed the river at the Gyaca Gorge, with catastrophic failure triggered during subsequent periods of climatic amelioration. Our findings reveal that glacial-interglacial climate cyclicity has exerted a first-order control on the pacing of the most extreme geomorphic events, fundamentally shaping the long-term landscape evolution of the world's highest mountain range.

自然大坝溃坝造成的灾难性突发洪水是地球上最强大的景观塑造因素之一，但它们的长期发生频率及其与轨道尺度气候周期的关系仍然缺乏约束。喜马拉雅东部的雅鲁藏布江提供了一个无与伦比的环境来解决这个问题，但研究主要集中在全新世事件上。在这里，我们将这一记录扩展到深过去，提出了一个全面的地貌和地质年代学重建溃坝，可追溯到~ 259 ka。我们根据巨大沙洲的现场证据确定了至少六个不同的、高震级的溃决洪水事件。水力模拟表明，这些事件具有巨大的峰值流量，范围为0.2至2.1 × 106 m3/s。强大的单粒红外后红外激发发光（pIRIR）测年建立了一个与不同集群安全相关的年表：与海洋同位素阶段（MIS） 8及其终止（~ 259 ka, <；242 ka和~ 232 ka）相关的早期系列，随后是在~ 115 ka (MIS 5d), ~ 18 ka （MIS 2）和~ 11 ka（最新更新世）发生的重大事件。至关重要的是，洪水沉积物与直接覆盖的古土壤的地层紧密耦合提供了物理证据，表明这些灾难性的破坏与快速的气候转变是同步的。这证实了一个系统的因果机制：在寒冷阶段（例如，MIS 8, MIS 6, MIS 2），山谷冰川的推进在Gyaca峡谷反复阻塞河流，并在随后的气候改善时期引发灾难性的破坏。我们的研究结果表明，冰期-间冰期气候循环对最极端地貌事件的速度起着一级控制作用，从根本上塑造了世界最高山脉的长期景观演变。

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引用次数: 0

The reconstruction of the destroyed city floods of the Daming Prefecture during Ming Dynasty 明代大明州被毁城市洪水的重建

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-03-15 Epub Date: 2026-01-05 DOI: 10.1016/j.palaeo.2026.113546

Tianyu Du , Xueyan Ren , Junxia Yan , Yuecong Li , Yuejie Wu , Mingxia Xie , Shaoqing Guo , Wei Lv , Nan Yang , Qinghai Xu , Bing Li , Huayong Li

Under global warming, extreme climate events are increasing in frequency.

Floods remain major disasters due to their frequent occurrence and widespread impacts on human societies. Current observational data inadequately constrain rare high-magnitude flood events, so the reconstruction of paleoflood with long time scale is particularly important. Daming Prefecture was once the capital of seven dynasties and served as the “Beijing” of the Northern Song Dynasty (960–1127 CE), with a significant military status, but the city was destroyed by a flood disaster in Ming Dynasty (about 1400 CE), retains ancient flood deposits, which provide valuable material for reconstructing ancient floods. Through the AMS ¹⁴C and archaeological dating, we established an accurate time frame for the paleoflood. Beyond the field lithology, particularly the brown-red clay, we determined the flood layers in the second and fifth layers using indicators like pollen, grain size, and magnetic susceptibility. Notably, the elevated levels of fine silt (46.1 %), organic matter (4.7 %), tree and shrub pollen (30.8 %), Pinus (27.2 %), and fern spores (46.5 %) are key markers for identifying paleoflood events in the area. The extreme paleoflood depth that destroyed the city was estimated at least 2.1–3.3 m based on end-point elevation method. Furthermore, we found that the paleoflood in the region was primarily influenced by weak El Niño conditions and the northward shift of the Intertropical Convergence Zone. This provides a scientific basis for the future construction of water conservancy facilities, flood control measures, and soil erosion prevention in the region.

在全球变暖的背景下，极端气候事件的发生频率越来越高。洪水因其频繁发生和对人类社会的广泛影响而成为主要灾害。目前的观测资料对罕见的高震级洪水事件约束不足，因此对长时间尺度的古洪水进行重建显得尤为重要。大明府曾是七朝都城，是北宋（公元960-1127年）的“北京”，具有重要的军事地位，但在明朝（公元1400年左右）被洪水摧毁，保留了古代洪水沉积物，为重建古代洪水提供了宝贵的资料。通过AMS 14C和考古测年，我们确定了古洪水发生的准确时间框架。除了野外岩性，特别是棕红色粘土，我们还利用花粉、粒度和磁化率等指标确定了第二层和第五层的洪水层。其中，细粉土（46.1%）、有机质（4.7%）、乔灌木花粉（30.8%）、松类（27.2%）和蕨类孢子（46.5%）含量的升高是识别古洪水事件的关键标志。根据终点高程法估计，古洪水极端深度至少为2.1 ~ 3.3 m。此外，该地区的古洪水主要受弱El Niño条件和热带辐合带北移的影响。这为今后该地区的水利设施建设、防洪措施和水土流失防治提供了科学依据。

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引用次数: 0

A mid-Cretaceous (late Albian–early Turonian) stable isotope record from southern Tibet – Pristine or diagenetically altered? 藏南中白垩世（阿尔白垩世晚期-吐鲁番世早期）稳定同位素记录——原始还是成岩蚀变？

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-03-15 Epub Date: 2026-01-07 DOI: 10.1016/j.palaeo.2026.113552

Meiling Han , Gang Li , Alexander Wheeler , Ulrich Heimhofer , Jörg Mutterlose

The late Albian to early Turonian interval was characterized by a pronounced greenhouse climate, marked by major perturbations of the global carbon cycle and the development of several Oceanic Anoxic Events (OAEs). These events are recognized by the widespread deposition of organic-rich black shales, typically associated with distinctive carbon isotope excursions (CIEs). While high-resolution carbon isotope records of the late Albian OAE (OAE 1d, ∼103 to 99.5 Ma) are well-documented in the western Tethys and North Atlantic, detailed studies across this event from the eastern Tethys remain limited. Here, we present new data from the Qiangdong section (Gamba area, southern Tibet), including stable carbon and oxygen isotope curves, mineralogy, Rock-Eval pyrolysis and palynofacies analysis. Our continuous δ¹³C_carb record provides detailed geochemical documentation for the upper Albian to lower Turonian, enabling robust chemostratigraphic correlation with global OAE 1d records. Negative δ¹⁸O_carb values (as low as −11.9‰) and mineralogical evidence (dominated by illite, > 50%) indicate strong diagenetic overprint. Both T_max values (432–560 °C) and highly degraded, dark-colored palynomorphs suggest that the sedimentary sequence of the Qiangdong section has undergone significant thermal alteration, with organic matter reaching mature to overmature stages. This is further supported by the dominance of Watznaueria barnesiae, consistent with previous findings indicative of significant diagenetic overprint. While the δ¹³C_carb record robustly captures the OAE 1d excursion, the characteristic CIE associated with the late Cenomanian to early Turonian OAE 2 is not well expressed. This attenuation is likely due to diagenetic overprinting and decrease in carbonate content, which may have altered or obscured primary palaeoenvironmental signals in the upper part of the Qiangdong section.

晚阿尔比世至早Turonian期以温室气候显著为特征，其标志是全球碳循环的重大扰动和几次海洋缺氧事件（oae）的发展。富有机质黑色页岩的广泛沉积可以识别这些事件，通常与独特的碳同位素漂移（CIEs）有关。虽然在特提斯西部和北大西洋有关于晚Albian OAE （OAE 1d, ~ 103 ~ 99.5 Ma）的高分辨率碳同位素记录，但从特提斯东部对这一事件的详细研究仍然有限。本文介绍了藏南甘巴羌东剖面的新资料，包括稳定碳氧同位素曲线、矿物学、岩石热解和孢粉相分析。我们的连续δ13Ccarb记录为上阿尔比统至下Turonian统提供了详细的地球化学记录，并与全球OAE 1d记录进行了强有力的化学地层对比。负δ18Ocarb值（低至- 11.9‰）和矿物学证据（以伊利石为主，占50%）显示出强烈的成岩覆印作用。Tmax值（432 ~ 560℃）和高度退化、颜色较深的岩相均表明强东剖面的沉积层序发生了明显的热蚀变，有机质达到成熟至过成熟阶段。巴氏瓦氏菌的优势进一步支持了这一点，与先前的研究结果一致，表明了显著的成岩叠印。虽然δ13Ccarb记录有力地反映了OAE的1d偏移，但与晚Cenomanian -早Turonian OAE 2相关的特征CIE并没有很好地表达。这种衰减可能是由于成岩叠印作用和碳酸盐含量的降低，改变或掩盖了强东剖面上部的原始古环境信号。

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引用次数: 0

Miocene evolution of the Humboldt Current 洪堡流中新世的演化

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-03-15 Epub Date: 2026-01-12 DOI: 10.1016/j.palaeo.2026.113558

John A. Barron , Thomas J. DeVries , Jason J. Coenen

Diatom records from the East Pisco Basin (EPB) of southern Peru and offshore Ocean Drilling Program (ODP) Hole 682 A reveal stepwise increases in the primary productivity of the Humboldt Current during the middle and late Miocene. Although diatoms are present back through the late middle Eocene, successively enhanced diatom production occurs during the Miocene in four steps. The first step between 14.2 and 13.8 Ma marks the onset of diatom deposition in the Pisco-0 sequence. A second step at ∼12.9 Ma coincides with a major drop in global sea level during which diatom deposition ceased in the EPB but continued in ODP 682 A as well as in Chile, Ecuador, and Colombia. Beginning at 10.4 to 10.0 Ma, a major increase in diatom sedimentation rates in both the EPB and in ODP 682 A signals an abrupt intensification of the Humboldt Current productivity, which may be related to the closure of the Central American Seaway to deeper water circulation. A fourth step coincides with the transgressive deposition of the diatom-rich Pisco-2 sequence at 8.4 Ma and is enhanced by the onset of the global Late Miocene Biogenic Bloom (8.0–4.5 Ma). Between 7 and 6 Ma, common subtropical diatoms in ODP 682 A contrast with high diatom deposition rates in the EPB, suggesting variable El Niño-La Niña conditions. During this time, fossil vegetation evidence from southern Peru supports the presence of seasonal periods of enhanced rainfall typical of El Niño conditions. The Miocene trend of increasing sea mammal diversity in the EPB parallels these steps, further supporting stepwise enhancement of primary productivity in the Humboldt Current during the Miocene.

来自秘鲁南部东皮斯科盆地（EPB）和ODP 682 A孔的硅藻记录揭示了中新世中晚期洪堡流初级生产力的逐步增加。虽然硅藻早在始新世中晚期就已存在，但中新世硅藻生产先后经历了四个阶段。14.2 ~ 13.8 Ma之间的第一步标志着Pisco-0层序硅藻沉积的开始。第二步发生在~ 12.9 Ma，与全球海平面大幅下降相吻合，在此期间，EPB的硅藻沉积停止，但ODP 682 A以及智利、厄瓜多尔和哥伦比亚的硅藻沉积仍在继续。从10.4至10.0 Ma开始，EPB和ODP 682 a的硅藻沉积速率的显著增加标志着洪堡流生产力的突然增强，这可能与中美洲海道向更深水循环关闭有关。第四阶段与8.4 Ma富硅藻的Pisco-2层序的海侵沉积相吻合，并因全球晚中新世生物爆发（8.0-4.5 Ma）的开始而加强。在7 ~ 6 Ma之间，ODP 682 A中常见的亚热带硅藻与EPB中高硅藻沉积率形成对比，表明El Niño-La Niña条件变化。在此期间，来自秘鲁南部的化石植被证据支持厄尔尼诺Niño典型条件下季节性降雨增加的存在。中新世EPB海洋哺乳动物多样性增加的趋势与这些步骤相似，进一步支持中新世洪堡海流初级生产力的逐步增强。

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引用次数: 0

Holocene precipitation change in an East Asian sandy land: Perspectives from the grain size records of multi-sections 东亚沙地全新世降水变化：来自多剖面粒度记录的视角

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-03-15 Epub Date: 2026-01-03 DOI: 10.1016/j.palaeo.2026.113545

Zhuo Yang , Dongmei Jie , Guizai Gao , Yutong Qian

Integrating multiple climate proxies is vital for advancing regional climate reconstruction. This study minimizes uncertainty among records by analyzing four aeolian-paleosol profiles (ADQ, HTGL, MJ, FX) within China's Horqin Sandy Land, using grain size as the primary climate proxy. Initially, end-member analysis was employed to separate the end-member components from the different profiles. By combining topsoil particle size data and modern meteorological monitoring data, the relationship between coarse-grained components and climate factors was established, providing strong evidence for the coarse-grained end-members in the sections that represent regional climate change. Based on this, we employed the regional averaging method to extract regional climate signals represented by coarse-grained end-member components from various profiles. Simultaneously, by integrating the locations of each profile with records of human activities, we investigated whether these climate signals were influenced by local signals. The results indicate that the regional climate signals derived from multiple profiles (grain size range: 77.77–566.88 μm) accurately reflect a precipitation trend in the region during the Holocene, which initially increased and then decreased. Furthermore, the end-member components representing regional climate signals in profiles from different locations may be affected by human activities and natural environmental factors, leading to the contamination of these signals with their respective local environmental signals.

综合多种气候指标对推进区域气候重建具有重要意义。本研究以粒度为主要气候指标，分析了中国科尔沁沙地4条风成-古土壤剖面（ADQ、HTGL、MJ、FX），最大限度地减少了记录中的不确定性。最初，采用端元分析从不同剖面中分离端元组分。结合表层土壤粒度数据和现代气象监测资料，建立了粗粒度组分与气候因子的关系，为代表区域气候变化剖面的粗粒度端元提供了有力证据。在此基础上，采用区域平均方法提取了以粗粒度端元分量为代表的区域气候信号。同时，通过将每个剖面的位置与人类活动记录相结合，我们研究了这些气候信号是否受到当地信号的影响。结果表明，多剖面（粒度范围77.77 ~ 566.88 μm）的区域气候信号准确反映了该区全新世降水先增加后减少的变化趋势。此外，代表不同地点剖面区域气候信号的端元分量可能受到人类活动和自然环境因子的影响，导致这些信号被各自的当地环境信号所污染。

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引用次数: 0

The Ailao Shan drainage divide is migrating northeastwards in response to the late Cenozoic kinematic reversal of the Red River Fault, southeastern margin of the Tibetan Plateau 哀牢山分水岭响应青藏高原东南缘晚新生代红河断裂的运动逆转，向东北方向迁移

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-03-15 Epub Date: 2026-01-17 DOI: 10.1016/j.palaeo.2026.113572

Feng Shi , Xibin Tan , Yijia Ye , Qiaoqiao Guo , Shuang Bian

The Red River Fault (RRF), an important block-boundary fault at the southeastern margin of the Tibetan Plateau, experienced a reversal in strike-slip direction in the late Cenozoic. The Ailao Shan is a mountain belt located parallel to the RRF on its southwestern side. The topographic analysis at the Ailao Shan may provide constraints for the kinematic reversal of the RRF and associated landform evolution. In this study, we analyze the drainage-divide stability at the Ailao Shan using χ-plot method. The results show that most segments of the Ailao Shan drainage divide are moving northeastwards (towards the RRF). This drainage-divide migration could be driven by differential uplift, dextral strike-slip faulting on the RRF, and/or the loss of drainage area of the Red River. To further constrain the vertical tectonic activity of the RRF, we analyzed channel steepness of rivers at the Ailao Shan based on the DEM. The results imply that the western segment of the RRF has normal fault activity, while the eastern segment does not. Overall, the results of topographic analysis at the Ailao Shan, including drainage-divide stability and the channel steepness index, jointly support that the RRF is a dextral strike-slip fault, with normal faulting component at its western segment. This study reveals that the landform of the Ailao Shan has not yet reached a steady state after the kinematic reversal of the RRF, and implies that the kinematic reversal might be a relatively young event.

红河断裂是青藏高原东南缘一条重要的块界断裂，在晚新生代经历了走滑方向的逆转。哀牢山是一个位于西南侧与RRF平行的山带。哀牢山的地形分析可以为RRF的运动逆转和相关地貌演化提供约束条件。本文采用χ-plot法对哀牢山流域分水稳定性进行了分析。结果表明：哀牢山分水岭大部分河段向东北方向移动（向RRF方向移动）；这种分水岭迁移可能是由差异隆升、RRF上的右走滑断裂和/或红河流域面积的损失驱动的。为了进一步约束RRF的垂直构造活动，我们基于DEM分析了哀牢山地区河流的河道坡度。结果表明，裂谷带西段有正常的断层活动，而东段没有。综上所述，哀牢山的地形分析结果，包括流域划分稳定性和河道陡度指数，共同支持该断裂为右旋走滑断裂，其西段有正断层成分。研究表明，哀牢山地貌在RRF运动逆转后尚未达到稳定状态，暗示该运动逆转可能是一个相对年轻的事件。

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引用次数: 0

Evolution of staggered Oligocene-Miocene transgressions and molluskan faunas in eastern Patagonian basins 东巴塔哥尼亚盆地渐新世-中新世交错海侵演化与软体动物区系

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-03-15 Epub Date: 2026-01-17 DOI: 10.1016/j.palaeo.2026.113575

Eduardo S. Bellosi , Claudia del Río , John McArthur , Ian L. Millar

Among the Cenozoic marine incursions in southern South America, the Chattian-Langhian Patagoniense episode is particularly significant due to its extensive spatial distribution, abundant fossil record, and comprehensive research history. It flooded several Atlantic basins, between S 40^o - 53^o, each with different tectonic context and infill history. In this work we present new geochronologic, stratigraphic, sedimentologic and paleontological data of the Patagoniense successions to evaluate basin evolution, sedimentation and their molluskan faunas; and to establish the regional architecture based on new correlations. The results confirm that the Patagoniense consisted of three separated transgressive episodes: Juliense, Leonense and Superpatagoniense, whose ages are here determined using Sr-isotope stratigraphy. Although largely overlooked before now as a separate transgression, we demonstrate that the Superpatagoniense interval is clearly distinguishable as a unique transgression, with an extensive record in basins of central and northern Patagonia between 15.9 and 15.0 Ma. The biostratigraphic reappraisal of the Patagoniense Molluskan Assemblages indicates that the youngest (NVG) fauna is preserved in the uppermost Leonense and Superpatagoniense beds, and can be calibrated between 17.0 and 15.0 Ma. This fauna was dominated by tropical genera, and ranged up to S 47^o during the Miocene Climatic Optimum, whilst also showing latitudinal changes in composition that are related to temperature. The three transgressions and the subsequent regressions exhibit a staggered pattern, being younger northwards. Such large-scale, orderly architecture would have responded to the independent or combined effects of several geological and climatic factors, but to date, none of them can be clearly established. They were not uniform or instantaneous, but rather propagated over ten million years across the marginal southeastern Atlantic basins. This tiered pattern suggests a common link between processes that controlled the transgressions, which must be considered in future works.

在南美洲南部的新生代海相入侵中，Chattian-Langhian Patagoniense期因其广泛的空间分布、丰富的化石记录和全面的研究历史而显得尤为重要。它淹没了几个大西洋盆地，在s400 - 530之间，每个盆地都有不同的构造背景和充填历史。在这项工作中，我们提出了新的巴塔哥尼亚序列的地质年代学、地层学、沉积学和古生物学资料，以评价盆地的演化、沉积及其软体动物群；建立基于新关联的区域架构。结果证实巴塔哥尼亚期由3个独立的海侵期组成：Juliense、Leonense和Superpatagoniense，并利用sr同位素地层学确定了它们的年龄。在15.9 ~ 15.0 Ma之间，在巴塔哥尼亚中部和北部盆地有广泛的记录，超巴塔哥尼亚层序是一个独特的海侵。对巴塔哥尼亚水母组合的生物地层重新评价表明，最年轻（NVG）动物群保存在Leonense和Superpatagoniense层的最上层，可以在17.0 ~ 15.0 Ma之间进行校准。该动物群以热带属为主，在中新世气候最适期最高可达南纬47度，同时在组成上也表现出与温度有关的纬度变化。三次海侵及其后的回退表现出交错的模式，向北更年轻。这种大规模的、有序的建筑可能是对几种地质和气候因素的独立或联合作用的反应，但到目前为止，它们都不能被清楚地确定下来。它们不是均匀的，也不是瞬间发生的，而是在大西洋东南部边缘盆地上传播了一千万年。这种分层模式表明了控制越界的过程之间的共同联系，这必须在未来的工作中加以考虑。

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引用次数: 0

Redox-driven diagenetic impacts on sedimentary and magnetic records during late Pleistocene oceanographic evolution on the Ross Sea continental margin 罗斯海大陆边缘晚更新世海洋演化中氧化还原成岩作用对沉积和磁记录的影响

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-03-15 Epub Date: 2026-01-17 DOI: 10.1016/j.palaeo.2026.113576

Ji Young Shin , Min Kyung Lee , Yongjae Yu , Sun Ki Choi , Jong Kuk Hong , Moon Son , Young Ji Joo

Sedimentary archives along the Ross Sea margin provide key insights into the interactions among Antarctic ice dynamics, bottom water formation, and depositional processes near the marine-based ice sheet. Here, we integrate sedimentological, geochemical, and magnetic records from a continental rise sediment core to reveal the late Pleistocene redox evolution and develop a refined age framework. A distinct redox transition is identified across the mid- to late Brunhes period, from reducing conditions—indicated by debilitated paleomagnetic signals, magnetite dissolution, and manganese depletion—to a more oxic interval enriched in maghemite and manganese-bearing phases. Sedimentary features straddling this boundary capture a shift from an ice-proximal deposition with reworked shelf materials to an ice-distal regime characterized by enhanced marine organic matter degradation and improved bottom water oxygenation. Combined relative paleointensity and lithostratigraphic alignments provide feasible chronological constraints for the last 400 kyr, although the iron reducing interval warrants careful consideration. The resulting chronology places the major stratigraphic and redox reorganization at ∼250 ka, coincident with the extensive Ross Sea ice retreat. These multi-proxy observations demonstrate that reductive magnetite loss during ice sheet expansions can substantially modify magnetic records near the Antarctic ice margin. Nevertheless, integrated sedimentary magnetic proxies remain effective tools for both developing age models and reconstructing past redox and cryosphere–ocean variability.

罗斯海边缘的沉积档案为了解南极冰动力学、底水形成和海洋冰盖附近的沉积过程之间的相互作用提供了关键的见解。在此，我们综合了来自大陆隆起沉积物岩心的沉积学、地球化学和磁记录，揭示了晚更新世氧化还原演化，并建立了一个精细的年龄框架。从古地磁信号减弱、磁铁矿溶解和锰消耗所表明的还原条件，到富含磁铁矿和含锰相的更富氧层段，在布伦什中晚期发生了明显的氧化还原转变。跨越这一边界的沉积特征体现了从冰-近端沉积到冰-远端沉积的转变，其特征是海洋有机质降解增强，底层水氧化作用改善。结合相对古强度和岩石地层排列，为最近400 kyr提供了可行的年代学约束，尽管铁还原区间值得仔细考虑。由此得出的年代学结果表明，主要的地层和氧化还原重组发生在~ 250 ka，与罗斯海广泛的海冰退缩一致。这些多代理观测结果表明，冰盖扩张期间的还原性磁铁矿损失可以大大改变南极冰缘附近的磁记录。然而，综合沉积磁指标仍然是开发年龄模型和重建过去氧化还原和冰冻圈-海洋变率的有效工具。

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引用次数: 0

Corrigendum to “Moulting behaviors in oryctocephalid trilobites reveal ontogenetic shifts in ecdysial strategies” [Palaeogeography, Palaeoclimatology, Palaeoecology volume 684 (2026) 113527] “orcytocephalid三叶虫的蜕皮行为揭示蜕皮策略的个体发生变化”的勘误[古地理，古气候，古生态学卷684 (2026)113527]

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-03-15 Epub Date: 2026-01-19 DOI: 10.1016/j.palaeo.2026.113569

Yifan Wang , Jorge Esteve , Dezhi Wang , Guangying Ren , Hui Zhang , Xiuchun Luo , Xinglian Yang

引用次数: 0

Holocene patterns of peat accumulation in Peruvian Amazonia 秘鲁亚马逊地区全新世泥炭堆积模式

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology

Pub Date : 2026-03-15 Epub Date: 2026-01-17 DOI: 10.1016/j.palaeo.2026.113579

I.T. Lawson , C.M. Åkesson , G.C. Dargie , J. del Aguila Pasquel , F.C. Draper , A. Hastie , T.J. Kelly , D. Sassoon , V. Abraham , T.R. Baker , D. Fabel , P. Gulliver , E.N. Honorio Coronado , K.H. Roucoux

Peatlands accumulate and store carbon over centuries to tens of millennia. Analysing the age structure of peatlands helps us to understand their genesis, development, and stability as carbon stores, and informs peatland management. Here we analyse new and previously published radiocarbon dates from peatlands in the Pastaza-Marañón Basin in Peru, the largest known peatland complex in Amazonia. We show that peatlands here are younger (< c. 8900 and frequently <2500 years old) than in many other parts of the tropics. Basal peat ages in extant peatlands vary depending on the geomorphological stability of the landscape, with younger basal dates typically occurring close to active river floodplains and older basal dates in more stable contexts. The data indicate that within individual peatlands, peat initiation may occur synchronously across a basin, or peat may spread laterally from one or more nucleation sites. Only two out of seven well-dated records show clear hiatuses in past peat accumulation, suggesting that carbon sequestration in some, but not all peatlands has been vulnerable to landscape hydrological change or climate change. Peatland ecosystems in the region are economically important sources of non-timber forest products, which it may be possible to harvest sustainably without biomass loss or drainage, but our analysis indicates that the peat itself accumulates too slowly to be considered as a renewable resource on economically meaningful timescales.

泥炭地在数百年到数万年的时间里积累和储存碳。分析泥炭地的年龄结构有助于我们了解泥炭地作为碳库的起源、发展和稳定性，并为泥炭地的管理提供信息。在这里，我们分析了秘鲁Pastaza-Marañón盆地泥炭地新的和以前发表的放射性碳年代，这是亚马逊地区已知最大的泥炭地复合体。我们表明，这里的泥炭地比热带地区的许多其他地区更年轻（约8900年，经常是2500年）。现存泥炭地的基础泥炭年龄取决于景观的地貌稳定性，较年轻的基础泥炭年龄通常发生在活跃的河流洪泛平原附近，而较老的基础泥炭年龄则发生在更稳定的环境中。数据表明，在单个泥炭地内，泥炭可能在整个盆地同步发生起核，或者泥炭可能从一个或多个成核地点横向扩散。在7份年代准确的记录中，只有2份显示了过去泥炭积累的明显中断，这表明在一些泥炭地（但不是所有的泥炭地）的碳固存容易受到景观水文变化或气候变化的影响。该地区的泥炭地生态系统是经济上重要的非木材林产品来源，在没有生物量损失或排水的情况下可持续地收获这些产品是可能的，但我们的分析表明，泥炭本身积累太慢，在经济上有意义的时间尺度上不能被视为可再生资源。

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