Closing the mid-Eocene palaeoceanography and time scale gap and testing Eocene climate hypotheses with material and data from IODP Expedition 342 (Newfoundland)

缩小始新世中期古海洋学和时间尺度差距，并利用 IODP 342 号探险队（纽芬兰）的材料和数据测试始新世气候假设

• 批准号: 242254604
• 负责人: Professor Dr. Heiko Pälike, Ph.D.
• 金额: --
• 依托单位: Zentrum für Marine Umweltwissenschaften (MARUM)
• 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/242254604?language=en
• 关键词: Closing; mid; Eocene; palaeoceanography; time

This proposal, as part of an international "Eocene stable isotope consortium", exploits the opportunity provided by newly drilled sediment drift deposits on the Southeast Newfoundland Ridge (IODP Exp. 342 Shipboard Scientists, 2012) to develop a refined, astronomically calibrated age model for the Eocene, that can then be applied to a newly generated coupled benthic and planktonic stable isotope reconstruction to address important questions about the North Atlantic ocean circulation, climate, and carbon cycle behaviour by detailing palaeoceanographic changes throughout the epoch. By doing so, this proposal seeks to revisit a suite of interrelated questions regarding the evolution the Eocene Earth System.Major objectives of this proposal are:1. Develop the first complete cyclostratigraphic age model for the Eocene based on a single locale. Close the "Eocene gap" and tie data into an absolute astrochronological age model; evaluate whether there is a relationship between dominant forcing response frequency and palaeoclimatic condition (presence of ice-sheets)2. Generate a high-resolution, astronomically tuned benthic and planktic foraminiferal (surface and thermocline) d13C and d18O time series for the Eocene (34-56 Ma), with a focus for this proposal to generate high resolution mixed layer and thermocline planktic stable isotope series within magnetochron C20r (~ca. 44.3-46.2 Ma Ma)3. Examine the magnitude (and sensitivity) of orbitally paced climate and carbon cycle dynamics across the Early to Late Eocene.4. Test hypotheses relating to the global nature of major Eocene carbon cycle events (Pälike et al., 2012), including the Equatorial Pacific Eocene-long deepening of the calcite compensation depth (CCD) and carbonate accumulation events (CAEs).The sedimentary successions from Expedition 342 are particularly useful to achieve these objectives because of continuous sedimentation throughout Eocene, with particularly high sedimentation rates in the middle to lower late Eocene, windows of excellent microfossil preservation, an excellent set of bio- and palaeomagnetic datums, and a key location to test hypotheses about Eocene deep water formation.

该提案是国际“始新世稳定同位素联盟”的一部分，利用纽芬兰东南部海脊新钻探的沉积物漂移沉积物提供的机会（IODP Exp. 342 船载科学家，2012 年），开发一个经过天文校准的精细年龄模型始新世，然后可以应用于新生成的耦合底栖和浮游稳定同位素重建，以解决有关北大西洋的重要问题通过详细说明整个时期的古海洋变化，本提案旨在重新审视有关始新世地球系统演化的一系列相互关联的问题。本提案的主要目标是：1。基于单一地点的始新世完整的旋回地层年龄模型，缩小“始新世差距”并将数据与绝对天文年代年龄模型联系起来；评估主导强迫响应频率与年龄之间是否存在关系。古气候条件（冰盖的存在）2. 生成始新世（34-56 Ma）的高分辨率、天文学调整的底栖和浮游有孔虫（表面和温跃层）d13C 和 d18O 时间序列，重点是在磁力记录器 C20r（~ca.）内生成高分辨率混合层和温跃层浮游稳定同位素系列。 44.3-46.2 Ma)3. 检查始新世早期到晚期的轨道气候和碳循环动态的幅度（和敏感性）。4. 检验与主要始新世碳循环事件的全球性质相关的假设（Pälike 等人， 2012），包括赤道太平洋始新世长期加深的方解石补偿深度（CCD）和碳酸盐堆积事件（CAE）。来自探险队的沉积序列342对于实现这些目标特别有用，因为整个始新世持续沉积，始新世中下晚期的沉积速率特别高，微化石保存良好，有一套出色的生物和古磁基准，并且是测试的关键位置关于始新世深水形成的假设。

项目成果

Astronomically paced changes in deep-water circulation in the western North Atlantic during the middle Eocene

始新世中期北大西洋西部深水环流的天文变化

• DOI: 10.1016/j.epsl.2017.12.016
• 发表时间: 2018
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Vahlenkamp;Niezgodzki;De Vleeschouwer;Bickert;Harper;Kirtland Turner;Lohmann;Sexton;Zachos;Pälike
• 通讯作者: Pälike

Data report: relative abundance of benthic foraminiferal morphotypes across the Eocene/Oligocene and Oligocene/Miocene boundaries (IODP Expedition 342 Site U1406|North Atlantic)

数据报告：始新世/渐新世和渐新世/中新世边界底栖有孔虫形态类型的相对丰度（IODP Expedition 342 Site U1406|北大西洋）

• DOI: 10.2204/iodp.proc.342.203.2017
• 发表时间: 2017
• 作者: Bohaty;Cameron;Coxall;D’haenens;De Vleeschouwer;Friedrich;Turner;Kordesch;Moriya;Norris;Opdyke;Penman;Pälike;Wilson;Sexton
• 通讯作者: Sexton