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New high-resolution compilation of benthic stable isotope data spanning 34 to 75 Ma - for both Atlantic and Pacific Ocean.

跨度 34 至 75 Ma 的大西洋和太平洋海底稳定同位素数据的新高分辨率汇编。

基本信息

批准号：
320221997
负责人：
Dr. Ursula Röhl
金额：
--
依托单位：
Department of Earth and Marine Sciences
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/320221997?language=en
关键词：
New resolution compilation benthic stable

项目摘要

In international collaboration we aim to develop an astronomically calibrated and high-resolution deep-sea benthic isotope reference curve for both Atlantic and Pacific Ocean spanning the Late Cretaceous to Eocene (34 to 75 Ma). The new record will utilize carefully selected deep-sea section at unprecedented resolution (<10kyr) and is envisioned to serve as the next generation benthic stable carbon and oxygen isotope reference curve. Current compilations do not resolve Milankovitch cyclicity and lack an astronomically tuned age model inadequate to study the true climate variability of the warm latest Cretaceous to Eocene global climate. With the recovery of new high-quality, multiple-hole cored sedimentary successions from the Atlantic (ODP Leg 171B, 207, 208, IODP Exp. 342) and the Pacific (ODP Leg 198 and 199, IODP Exp. 320/321) suitable material has been recovered to generate high-resolution (<10kyr) benthic stable isotope records. In our project we seek to compile available benthic stable isotope data, fill gaps by generating new records and increase the resolution of existing records from 34 to 75 Ma. Extensive generation of new benthic data will even allow forming a single continuous record for the South Atlantic on sediments retrieved during Leg 208 (Walvis Ridge). Based on extensive data sets and the detailed knowledge of earlier projects we will update, modify and then establish a fully integrated and consistent astronomically calibrated age model for the Atlantic and Pacific compilation which will consist of the genus Cibicidoides and Nuttallides only. Our synchronized astronomical time scale will provide completely new insight to the Eocene to Late Cretaceous climate dynamics. Having two high-resolution records from two ocean basins we will be able to compare Atlantic and Pacific paleoceanographic changes and characteristics at unprecedented detail in a relatively warm interval of Earths history. The high-resolution records established in this project combined with a very accurate age model will provide new insight to the instability of the climate system during the long-term cooling trend of the latest Campanian and Maastrichtian and the shift from greenhouse to icehouse climate state in the Late Eocene.

在国际合作中，我们的目标是制定一个天文校准和高分辨率的深海底栖同位素参考曲线，大西洋和太平洋跨越晚白垩世至始新世（34至75马）。新记录将利用精心挑选的深海剖面，其分辨率前所未有（<10 kyr），并设想作为下一代海底稳定碳和氧同位素参考曲线。目前的汇编没有解决米兰科维奇旋回性，缺乏一个天文调整的年龄模型不足以研究温暖的最后白垩纪至始新世全球气候的真实气候变化。随着大西洋新的高质量、多孔岩心沉积序列的恢复（ODP 171 B、207、208航次，IODP Exp. 342)和太平洋（ODP 198和199航次，IODP Exp. 320/321）的适当材料，以生成高分辨率（<10 kyr）的海底稳定同位素记录。在我们的项目中，我们力求汇编现有的底栖稳定同位素数据，通过产生新的记录来填补空白，并将现有记录的分辨率从34 Ma提高到75 Ma。大量生成新的海底数据甚至将使人们能够对第208航次（沃尔维斯海岭）期间收集到的沉积物形成一个单一的南大西洋连续记录。基于广泛的数据集和早期项目的详细知识，我们将更新，修改，然后建立一个完全集成的和一致的天文学校准的年龄模型，大西洋和太平洋的汇编将包括属Cibicidoides和Nuttallides只。我们同步的天文时间尺度将为始新世到晚白垩纪的气候动力学提供全新的见解。有了来自两个海洋盆地的两个高分辨率记录，我们将能够在地球历史上相对温暖的时期以前所未有的细节比较大西洋和太平洋的古海洋学变化和特征。该项目中建立的高分辨率记录与非常精确的年龄模型相结合，将为最新坎帕尼亚期和马斯特里赫特期的长期冷却趋势以及始新世晚期气候状态从温室到冰库的转变过程中气候系统的不稳定性提供新的见解。