Exp392EventStratigraphy – high resolution bulk stable carbon isotope stratigraphy of major Paleogene events drilled during IODP Expedition 392 on Agulhas Plateau

Exp392EventStratigraphy â IODP 392 远征期间在厄加勒斯高原钻探的主要古近纪事件的高分辨率块状稳定碳同位素地层学

• 批准号: 527510938
• 负责人: Dr. Thomas Westerhold
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/527510938?language=en
• 关键词: Exp392EventStratigraphy; resolution; bulk; stable; carbon

The Paleogene, the period in Earth history from 66 to 23 million years ago (Ma), is of major interest in paleoclimate research because Earth’s climate system was in a different state than today. During the Paleocene (66 – 56 Ma) and the Eocene (56 – 34 Ma) Epochs the 'Warmhouse State' with global temperatures more than 5°C warmer than they are today persisted, interrupted by the 'Hothouse State' from 56 to 47 Ma. Anthropogenic carbon emissions since 1850 are causing global warming and might lead to global climate conditions last encountered in the Paleocene and Eocene already by the year 2300. Studying consequences of climate disruption and effects on the ecosystem in a warmer world is sensible to assess and mitigate potential future climate pathways. This is particularly important for high latitudes because the impact of global warming is expected to be amplified with respect to the lower latitude. Most interesting in the warmer climate states are the following major climate disruption events: the Cretaceous/Paleogene (K/Pg) Meteorite Impact at 66 Ma, the Late Danian Event (LDE) at 62.1 Ma, the Early Late Paleocene Event (ELPE) at 59.3 Ma, the Paleocene Eocene Thermal Maximum (PETM) at 55.9 Ma, and the Middle Eocene Climate Optimum (MECO) at 40.3 Ma. Most of our understanding about these events comes from marine sediment deposits drilled by scientific ocean drilling expeditions. New and very detailed archives of these events from high latitudes have recently been recovered in sediment cores drilled during International Ocean Discovery Program (IODP) Expedition 392 on the Agulhas Plateau in the Southwest Indian Ocean. During the Paleogene this region was positioned at paleolatitudes of ~53° to 56°S and within the gateway between the South Atlantic, Southern Ocean, and southern Indian Ocean basins. The objectives of the project is to generate high resolution bulk carbonate stable carbon and oxygen isotope data on sediments from IODP Site U1579 and Site U1580 for the above paleoclimate events. The bulk stable isotope data are urgently needed to enable a clear identification and a geochemical characterization of the recovered events as well as to establish a highly precise age model to allow global correlation. This project will provide key data and results for other collaborative studies conducted by IODP Expedition 392 science members. It is expected to gain novel insight to Paleogene paleoclimate events with very high impact.

古近纪是地球历史上 66 至 2300 万年前 (Ma) 的时期，它是古气候研究的主要关注点，因为地球的气候系统在古新世 (66 – 56 Ma) 和始新世期间处于不同的状态。 （56 – 34 Ma）全球气温比今天高出 5°C 以上的“温室状态”持续存在，但被“温室状态”打断自 1850 年以来的 56 至 47 Ma 的人为碳排放正在导致全球变暖，并可能导致 2300 年出现古新世和始新世最后一次出现的全球气候状况。研究气候破坏的后果以及变暖世界对生态系统的影响是明智的。评估和减轻未来潜在的气候路径，这对于高纬度地区尤其重要，因为全球变暖的影响预计会在气候温暖的州放大。以下是主要的气候破坏事件：66 Ma 的白垩纪/古近纪 (K/Pg) 陨石撞击、62.1 Ma 的晚丹尼事件 (LDE)、59.3 Ma 的早晚古新世事件 (ELPE)、古新世始新世热流最大值 (PETM) 为 55.9 Ma，中始新世气候最佳值 (MECO) 为 40.3 Ma。我们对这些事件的了解来自科学海洋钻探探险队钻探的海洋沉积物沉积物。最近，在国际海洋发现计划 (IODP) 第 392 次阿加勒斯高原探险期间钻探的沉积岩芯中发现了这些来自高纬度地区的事件的新的、非常详细的档案。在古近纪期间，该地区位于古纬度约 53° 至 56°S 之间，位于南大西洋、南大洋和南印度洋盆地之间的门户内。该项目的目标是为上述古气候事件生成 IODP 站点 U1579 和站点 U1580 沉积物的高分辨率批量碳酸盐稳定碳和氧同位素数据，以便能够进行清晰的识别和地球化学表征。该项目将为 IODP Expedition 392 science 进行的其他合作研究提供关键数据和结果。成员们有望获得对影响非常大的古近纪古气候事件的新颖见解。