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

在国际合作中，我们的目标是开发一个天文校准和高分辨率的深海底栖生物同位素参考曲线，横跨晚白垩纪至始新世（34至75 Ma）大西洋和太平洋。新记录将以前所未有的分辨率（<10kyr）精心选择深海剖面，并被设想为下一代底栖生物稳定的碳氧同位素参考曲线。目前的汇编不能解决米兰科维奇周期问题，而且缺乏天文校正的年龄模型，不足以研究温暖的白垩纪晚期到始新世全球气候的真实气候变化。随着大西洋（ODP Leg 171B, 207, 208, IODP Exp. 342）和太平洋（ODP Leg 198和199，IODP Exp. 320/321）新的高质量多孔岩心沉积序列的恢复，已经恢复了合适的物质，以产生高分辨率（<10kyr）底栖稳定同位素记录。在我们的项目中，我们试图汇编现有的底栖生物稳定同位素数据，通过生成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。大量新的底栖生物数据甚至可以形成一个单一的连续记录，记录南大西洋在第208条（沃尔维斯岭）期间回收的沉积物。基于广泛的数据集和早期项目的详细知识，我们将更新、修改并建立一个完全集成和一致的天文校准年龄模型，用于大西洋和太平洋汇编，该汇编将仅包括Cibicidoides属和Nuttallides。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，这是地球历史上相对温暖的时期。该项目建立的高分辨率记录与非常精确的年龄模型相结合，将为最新坎帕尼亚和马斯垂克时期长期降温趋势期间气候系统的不稳定性以及晚始新世从温室气候状态向冰窖气候状态的转变提供新的见解。

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.