Albian paleoceanography and paleotemperatures of the tropical western Atlantic (ODP Leg 207, Demerara Rise) - the onset of the mid-Cretaceous super-greenhouse climate.

热带西大西洋的阿尔布古海洋学和古气温（ODP Leg 207，德梅拉拉海隆）——白垩纪中期超级温室气候的开始。

• 批准号: 180141866
• 负责人: Professor Dr. Oliver Friedrich
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/180141866?language=en
• 关键词: Albian; paleoceanography; paleotemperatures; tropical; western

This project aims at deciphering the paleoceanographic, paleoclimatic and paleoecologic conditions of the mid to late Albian at one of the warmest locations of the Cretaceous ocean, the tropical proto-North Atlantic. Another important aspect is the reconstruction of the oceanographic conditions, which led to the long lasting-deposition of organic-rich sediments at Demerara Rise and if warm, saline bottom waters occurred as early as the Albian. This will be achieved by studying material from the Demerara Rise (ODP Leg 207). Demerara Rise occupies a central position for understanding mid-Cretaceous water temperatures and the mechanisms of Cretaceous black shale deposition. Stable isotopes of organic matter and planktic and benthic foraminifers (δ18O, δ13C) as well as benthic foraminiferal assemblages from Site 1258 will be used to achieve the following main goals: (1) Establishing a mid to Late Albian chemostratigraphy, (2) expanding the existing SST and deeper water paleotemperature history in the core of the tropics into the Albian, (3) deciphering the trigger mechanisms of OAE 1d formation in the tropical Atlantic, (4) clarifying if warm, saline deep waters existed in the Albian and, if yes, their role for marine ecosystems and source-rock formation, and (5) investigating the ecology of foraminifera in organic-rich environments.

该项目旨在破译阿尔比安中期至晚期阿尔比亚人的古生物学，古气候和古生态状况，在白垩纪海洋最温暖的地方之一，热带原始北大西洋。另一个重要方面是重建海洋状况，这导致了Demerara上升时有机富的沉积物的持久沉积，如果温暖，盐水底部水就早于阿尔比亚人。这将通过研究Demerara Rise的材料（ODP Leg 207）来实现。 Demerara Rise占据了理解白垩纪水温和白垩纪黑色页岩沉积机制的中心位置。 Stable isotopes of organic matter and planktic and benthic foraminifers (δ18O, δ13C) as well as benthic foraminiferal assemblages from Site 1258 will be used to achieve the following main goals: (1) Establishing a mid to Late Albian chemostratigraphy, (2) expanding the existing SST and deeper water paleotemperature history in the core of the tropicalities into the Albian, （3）解释了热带大西洋中OAE 1D形成的触发机制，（4）澄清是否存在温暖的Albian中存在盐水深水，如果是的，则它们在海洋生态系统和源岩石形成中的作用，以及（5）研究有机环境中有孔的生态学的生态学。