Evolution of deep-ocean circulation during the opening of the Atlantic Ocean in the latest Cretaceous and Paleocene

白垩纪晚期至古新世（75-55 Ma）的海洋环流模式至今尚不清楚，相对于大西洋的开放，深水形成的可能位置存在争议。这个项目的目的是调查北大西洋和南大西洋各个子盆地的中深水形成和交换条件。计划对北大西洋和南大西洋不同子盆地和不同水深的一系列DSDP和odp地点的沉积物涂层进行nd同位素分析。通过识别不同的中深水团的潜在源区和探测海洋子盆地之间已建立的深水联系的时间间隔，可以识别不同的中深水团和深水团。新的和现有的地层学数据的可靠整合将提供以下问题的答案：1)何时成为大西洋深处的单个子盆地完全融入全球温盐环流；2)海底火山高原以何种方式形成深水屏障；3)加勒比海作为大西洋和太平洋之间深水交换的赤道门户是如何参与的。

The mode of ocean circulation during latest Cretaceous to Paleocene times (75-55 Ma) is poorly understood to date and possible sites of deep-water formation relative to the opening of the Atlantic Ocean are controversially debated. This project aims at the investigation of the conditions of intermediate- and deep-water formation and exchange in the individual sub-basins of the North and South Atlantic Ocean. It is planned to perform Nd-isotope analyses of sediment coatings from a series of DSDP- and ODP-Sites in different sub-basins and different water depths in the Northand South Atlantic Ocean. This allows to identify different intermediate and deep-water masses by recognition of their potential source region and the detection of time intervals of established deepwater connections between the oceanic sub-basins. The stratigraphic reliable integration of newand available data will provide answers to the following questions: 1) when became the individual sub-basins of the deep Atlantic Ocean fully integrated into the global thermohaline circulation, 2) in which way formed sub-oceanic volcanic plateaus barriers for deep waters, and 3) how involved was the Caribbean Sea as equatorial gateway for deep-water exchange between the Atlantic and the Pacific oceans.