Synthesis of Paleogene stratigraphy: Towards the first orbitally tuned stratigraphic framework for the early Paleogene

我们计划编译和解释从西北太平洋、赤道太平洋、加勒比海、赤道大西洋西部和南大西洋东部十个选定的ODP地点钻探的数据集，以关闭仍然存在的早至晚始新世旋回地层缺口。综合已发表的记录和在该项目中获得的新数据集，将产生第一个完全基于轨道调谐的古近纪早期（- 6600万至- 3500万年前）完整的地层格架。将这个新的地层格架与古新世晚期的轨道调整时间尺度联系起来，将为所有生物地层事件、磁地层带边界和古气候事件提供第一个绝对年龄。该研究旨在基于对各种物理性质和地球化学数据集的综合分析，重点是XRF核心扫描仪的应用，该扫描仪已被证明是高分辨率长时间序列工作的重要工具。此外，我们希望进行稳定同位素分析，以进一步研究新的古海洋事件，并为构建首条高分辨率的太平洋古近系稳定同位素曲线做出贡献。一个强大的地层格架的合成和构建也将为早期古近纪气候系统提供新的见解，并将成为确定IODP内未来钻探地点的先决条件。最后，我们希望通过比较高精度的40Ar/39Ar年代与轨道调整的灰层年代，来检验始新世早期放射性测年的准确性。

We are planning to compile and interpret datasets from ten selected ODP sites drilled in the Northwest Pacific, Equatorial Pacific, Caribbean Sea, western Equatorial Atlantic, and eastern South Atlantic to close the still existing early to late Eocene cyclostratigraphic gap . The synthesis of published records and new datasets to be acquired within this project will lead to the first complete stratigraphic framework for the early Paleogene (-66 to -35 million years ago) entirely based on orbital tuning. Connecting this new stratigraphic framework to the late Paleocene orbitally tuned time scale will provide the first absolute ages for all biostratigraphic events, magnetostratigraphic zone boundaries, and paleoclimatic events. The study is intended to base on a combined analysis of various physical properties and geochemical data sets with focus on the application of the XRF Core Scanner which has been proved as the essential tool for working on long time series at high-resolution. In addition, we want to perform stable isotope analyses for further investigating new paleoceanographic events, and to contribute to the construction of the first high resolution Pacific Ocean stable isotope curve for the Paleogene. The synthesis and construction of a robust stratigraphic framework will also provide new insights into the early Paleogene climate system and will be the prerequisite for defining future drilling sites within IODP. Finally, we want to test the accuracy of radiometric dating in the early Eocene by comparing high precision 40Ar/39Ar dates with orbitally tuned dates of ash layers.