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位置之一--热带原北大西洋阿尔卑斯中晚期的古海洋、古气候和古生态条件。另一个重要的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质的沉积物的长期沉积，如果温度较高，咸水底水域最早出现在阿尔比亚海。这将通过研究德梅拉拉隆起(ODP207腿)的材料来实现。DERERARA隆升在了解中白垩世水温和白垩纪黑色页岩沉积机制中占有中心地位。将利用有机质、浮游有孔虫和底栖有孔虫(δ18O、δ13C)的稳定同位素以及1258站点的海底有孔虫组合来实现下列主要目标：(1)建立阿尔比亚中晚期的化学地层学，(2)将热带核心现有的海温和深水古温度历史扩展到阿尔比亚海，(3)破译热带大西洋海洋有孔虫1D形成的触发机制，(4)澄清阿尔比亚海是否存在温暖的咸水深水，如果是的话，它们对海洋生态系统和源岩形成的作用，以及(5)调查富有机环境中的有孔虫生态。

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.