Oceanographic and climate changes during the Danian-Selandian transition in the West Atlantic: evidence for a hyperthermal event?

西大西洋丹尼安-塞兰蒂安过渡期间的海洋学和气候变化：高温事件的证据？

• 批准号: 86505022
• 负责人: Dr. Peter Schulte
• 金额: --
• 依托单位: Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/86505022?language=en
• 关键词: Oceanographic; climate; changes; during; Danian

The Paleocene-early Eocene is punctuated by several transient, -20-200 ky lasting hyperthermal events of which the Paleocene-Eocene Thermal Maximum (PETM) was the most prominent. Abruptly shallower lysocline/CCD, negative 613C excursions, and benthic faunal turnover all imply a major perturbation of the ocean system during these events. Our recent research at the Southern Tethyan shelf suggests the presence of an additional hyperthermal event associated with sea-level fluctuations during the Danian-Selandian (DS) transition. Independently, several deep sea sites include a clay layer ("Chron 27n event") that may correlate with the D-S event in the Tethys. This project aims to decipher paleoceanographic and paleoclimatic changes during the D-S transition in the OOP Leg 165 from the Caribbean and Leg 171B from the Western Atlantic. Both drillsites provide an expanded and stratigraphically complete Paleocene record including distinct clay layers. High-resolution stable isotope, sedimentological, mineralogical, and biostratigraphic analysis will be applied for (i) achieving a continuous 613C and 618O chemostratigraphy for estimating environmental disturbances and temperatures, (ii) constraining paleoclimate and paleoceanographic changes by mineralogical proxies, and (iii) linking the D-S transition in the deep sea sites with the Tethyan realm by biostratigraphy and stable isotopes.

古新世-始新世早期不时出现几次短暂的、-20-200 ky 持续的高温事件，其中古新世-始新世最大热值 (PETM) 是最突出的。突然变浅的溶斜层/CCD、负613C偏移和底栖动物更替都意味着在这些事件期间海洋系统发生了重大扰动。我们最近在南特提斯大陆架的研究表明，在丹尼安-塞兰迪亚（DS）过渡期间，存在与海平面波动相关的额外高温事件。独立地，几个深海地点包括粘土层（“Chron 27n 事件”），可能与特提斯的 D-S 事件相关。该项目旨在破译来自加勒比海的 OOP 165 段和来自西大西洋的 171B 段 D-S 转变期间的古海洋和古气候变化。两个钻探场都提供了扩展且地层完整的古新世记录，包括不同的粘土层。高分辨率稳定同位素、沉积学、矿物学和生物地层分析将用于 (i) 实现连续 613C 和 618O 化学地层学，以估计环境扰动和温度，(ii) 通过矿物学代理约束古气候和古海洋变化，以及 (iii) 将深海地点的 D-S 转变与特提斯联系起来 生物地层学和稳定同位素领域。