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

该项目旨在破译白垩纪海洋最温暖的地区之一，热带原始北大西洋中晚期Albian的古海洋学，古气候和古生态条件。另一个重要方面是海洋条件的重建，这导致了德梅拉拉隆起富含有机物的沉积物的长期持续沉积，如果早在阿尔比安期就出现了温暖的咸底层沃茨。这将通过研究德梅拉拉隆起（ODP第207航段）的材料来实现。德梅拉拉隆起在了解白垩纪中期水温和白垩纪黑色页岩沉积机制方面占据中心地位。有机质稳定同位素与浮游和底栖有孔虫将利用1258号站点的δ 18 O、δ 13 C以及底栖有孔虫组合来实现以下主要目标：（1）建立阿尔布期中晚期化学地层学;（2）将热带核部现有的SST和深水古温度历史扩展到阿尔布期，（3）阐明热带大西洋OAE 1d形成的触发机制;（4）阐明阿尔布阶是否存在温暖、含盐的深水沃茨，如果存在，它们对海洋生态系统和烃源岩形成的作用;（5）研究富有机质环境中有孔虫的生态学。

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.