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，地球历史上从6600万年前到2300万年前的时期，是古气候研究的主要兴趣，因为地球的气候系统处于与今天不同的状态。在古新世（66 - 56 Ma）和始新世（56 - 34 Ma）时期，全球温度比今天高5°C以上的“温室状态”持续存在，被56 - 47 Ma的“温室状态”打断。自1850年以来的人为碳排放正在导致全球变暖，并可能在2300年之前导致上一次在古新世和始新世遇到的全球气候状况。在一个变暖的世界中，研究气候破坏的后果和对生态系统的影响，对于评估和缓解未来潜在的气候路径是明智的。这对高纬度地区尤其重要，因为预计全球变暖的影响相对于低纬度地区将被放大。在温暖的气候状态中，最有趣的是以下主要的气候中断事件：66 Ma的白垩纪/古近纪（K/Pg）陨石撞击，62.1 Ma的晚大年事件（LDE）， 59.3 Ma的早晚古新世事件（ELPE）， 55.9 Ma的古新世始新世热最大值（PETM）和40.3 Ma的中始新世气候最佳（MECO）。我们对这些事件的大部分了解来自科学海洋钻探探险所钻探的海洋沉积物。最近，在西南印度洋阿古拉斯高原的国际海洋发现计划（IODP）第392次探险期间，在沉积物岩心中发现了这些高纬度地区事件的新的非常详细的档案。在古近纪，该地区位于~53°~ 56°S的古纬度，是南大西洋、南大洋和南印度洋盆地之间的门户。该项目的目标是生成来自IODP站点U1579和站点U1580的沉积物的高分辨率块状碳酸盐稳定碳和氧同位素数据，用于上述古气候事件。目前迫切需要大量的稳定同位素数据，以便对恢复的事件进行清晰的识别和地球化学表征，并建立高精度的年龄模型，以便进行全球对比。该项目将为IODP 392远征队的科学成员进行的其他合作研究提供关键数据和结果。它有望对具有重大影响的古近系古气候事件有新的认识。