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.

作为国际“始新世稳定同位素联盟”的一部分，该提案利用了纽芬兰海岭东南部新钻探的沉积物漂移沉积提供的机会（IODP Exp. 342 Shipboard Scientists，2012）开发一个精确的、天文学校准的始新世年龄模型，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，通过详细描述整个时期的古海洋学变化，解决有关北大西洋海洋环流、气候和碳循环行为的重要问题。通过这样做，这一建议旨在重新审视一套相互关联的问题，有关的演变始新世地球系统。建立第一个基于单一地点的始新世完整的旋回地层年龄模型。关闭“始新世空白”和领带数据到一个绝对的天体年代学模型;评估是否有主导强迫响应频率和古气候条件（冰盖的存在）2之间的关系。生成始新世（34-56 Ma）的高分辨率、天文调谐的底栖和南极有孔虫（表面和温跃层）d13 C和d18 O时间序列，重点是生成磁时C20 r（~约）内的高分辨率混合层和温跃层南极稳定同位素序列。44.3-46.2 Ma）研究早始新世到晚始新世轨道节奏气候和碳循环动力学的幅度（和敏感性）。与主要始新世碳循环事件的全球性质有关的测试假设（Pälike等人，2012年），包括赤道太平洋始新世长时间的方解石补偿深度加深（CCD）和碳酸盐累积事件（CAE）。342号探险的沉积序列对于实现这些目标特别有用，因为整个始新世持续沉积，中到晚始新世的沉积速率特别高，是优秀微体化石保存的窗口，一组极好的生物和古地磁数据，以及测试始新世深水形成假说的关键位置。

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