Completing the Eocene cyclostratigraphy - new perspectives from a greenhouse world

完成始新世旋回地层学——温室世界的新视角

• 批准号: 242241969
• 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: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/242241969?language=en
• 关键词: Completing; Eocene; cyclostratigraphy; new; perspectives

The aim of our project is to establish a for the first time complete cyclostratigraphic framework based on the identification of the stable long eccentricity cycle for the entire Eocene (55 to 34 Ma) for both the Atlantic and Pacific oceans at unprecedented resolution. The accuracy of the intended age model for both oceans will allow very detailed insights into the Eocene greenhouse climate variability in general and the transition to a cooler Late Paleogene climate state. In the here proposed third year we plan to round-off and extend our records based on the right now evolving, very exciting results. These additional analyses are crucial to achieve the scientific objectives of our project. New magnetostratigraphic data covering magnetic polarity Chrons C23 and C24n at Leg 208 sites and additional stable isotope data to determine the exact duration of magnetic polarity Chron C18n are key records for completing the Eocene Atlantic stratigraphic framework. Built on the very promising results from the ongoing first phase of our project we envisage investigating additional selected intervals for two additional, relative short high-resolution benthic isotope records. This is important to test whether Earth´s climate cooled through a series of individual steps rather than gradually at the end of the long-term cooling following the extremely warm world of the Early Eocene Climate Optimum more than 12 million years before the Eocene - Oligocene transition. Ultimately, integrating and synthesizing all magneto-, chemo-, and cyclostratigraphic data of the project will substantially contribute to document the occurrence and frequency of middle to late Eocene hyperthermal events, understanding their relationship to orbital forcing, and their relationship to greenhouse climate dynamics.

我们项目的目的是，基于在空前的分辨率下，基于整个始新世（55至34 MA）的稳定长期偏心周期（55至34 MA）的稳定长偏心周期（55至34 mA）的稳定偏心周期的确定。两种海洋的预期年龄模型的准确性将允许对始新世温室气候变异性以及过渡到较冷的古近期气候状态的过渡非常详细。在此拟议的第三年中，我们计划根据目前不断发展的，令人兴奋的结果来绕开和扩展我们的记录。这些额外的分析对于实现我们项目的科学目标至关重要。涵盖磁性极性Chrons C23和C24N的新的磁性数据在208个位置和其他稳定的同位素数据，以确定磁性极性Chron C18N的确切持续时间是完成始新世大西洋地层框架的关键记录。基于我们项目的不断发展的前景结果，我们设想调查其他两个相对短分辨率的底栖同位素记录的其他选定间隔。这对于测试地球的气候是否通过一系列单个步骤冷却而不是在长期冷却结束时逐渐冷却，这是始新世早期气候最佳的极度温暖的世界，超过1200万年 - 始新世 - 渐新世过渡。最终，整合和综合该项目的所有磁，化学，化学和环地层学数据将大大有助于记录始新世过高热热事件的发生和频率，了解它们与轨道强迫的关系，以及它们与温室气候动力学的关系。

项目成果

An abyssal carbonate compensation depth overshoot in the aftermath of the Palaeocene-Eocene thermal maximum

• DOI: 10.1038/ngeo2757
• 发表时间: 2016-08
• 期刊: Nature Geoscience
• 影响因子: 18.3
• 作者: D. Penman;S. Turner;P. Sexton;R. Norris;A. Dickson;S. Boulila;A. Ridgwell;R. Zeebe;J. Zachos;A. Cameron;T. Westerhold;U. Röhl

Environmental perturbations at the early Eocene ETM2, H2, and I1 events as inferred by Tethyan calcareous plankton (Terche section, northeastern Italy)

• DOI: 10.1002/2016pa002940
• 发表时间: 2016-09
• 期刊: Paleoceanography
• 作者: R. D’Onofrio;V. Luciani;E. Fornaciari;L. Giusberti;F. B. Galazzo;E. Dallanave;T. Westerhold;M. Sprovieri;Sonia Telch