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

古近纪是地球历史上从6600万年前到2300万年前(Ma)的时期，对古气候研究具有重大意义，因为地球的气候系统与今天处于不同的状态。在古新世(66-56 Ma)和始新世(56-34 Ma)时期，全球气温比今天高出5℃以上的“温室状态”持续存在，并被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，并可能导致上一次出现在古新世和始新世的全球气候状况，已经是在2300年前。在一个变暖的世界里，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，因为全球变暖的影响预计会放大到较低纬度地区。在较温暖的气候状态中，最有趣的是下列主要气候干扰事件：白垩纪/古近纪(K/PG)陨石撞击(66 Ma)、大年晚期事件(LDE)(62.1 Ma)、晚古新世早期事件(ELPE)(59.3 Ma)、古新世始新世最热事件(PETM)(55.9 Ma)和中始新世气候最佳事件(MECO)(40.3 Ma)。我们对这些事件的了解大多来自科学海洋钻探探险队钻探的海洋沉积物。最近在西南印度洋阿古拉斯高原国际海洋发现计划(IODP)第392次考察期间钻探的沉积物岩芯中发现了这些来自高纬度地区的新的、非常详细的事件记录。古近纪，该区位于S古纬度约53°~56°，位于南大西洋、南大洋和南印度洋盆地之间的门户地带。该项目的目标是为上述古气候事件生成IODP站点U1579和U1580站点沉积物的高分辨率块状碳酸盐稳定碳和氧同位素数据。迫切需要大量稳定的同位素数据，以便能够对恢复的事件进行明确的识别和地球化学描述，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 Expedition 392科学成员开展的其他合作研究提供关键数据和结果。它有望对古近纪古气候事件有新的认识，具有很高的影响。

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.