Ocean-continent interactions in the mid Cretaceous Equatorial Atlantic realm

白垩纪中期赤道大西洋区域的海洋与大陆相互作用

• 批准号: 48963889
• 负责人: Dr. Daniel Birgel
• 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: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/48963889?language=en
• 关键词: Ocean; continent; interactions; mid; Cretaceous

The project aims at deciphering terrestrial environmental dynamics and palaeoceanographic changes during the mid-Cretaceous super-greenhouse world based on the analysis of macerals, carbon and hydrogen isotope composition of plant-wax lipids and inorganic geochemical parameters via XRF scans in marine sediments. Our proposal shall try to answer paleoenvironmental key questions arising from these projects. We expect a straightforward correlation of data from the terrestrial and marine realms, thus yielding the opportunity to obtain a comprehensive view of global change during the investigated time slice. Analyses in varying resolution will be carried out across the upper Albian to lower Turanian interval to assess environmental and oceanographic change during the formation of various palaeoceanographic events. These events are the latest Albian Oceanic Anoxic Event Id (OAE Id), the Mid Cenomanian Event (MCE) and the Late Cenomanian OAE 2 all of which are representing major perturbations of the global carbon cycle. Investigations will be made along a stratigraphic splice of two sites from OOP Leg 207 (Demerara Rise) (Sites 1258 and 1260). Complementary analyses will be performed on selected intervals of DSDP Site 367 (Cape Verde Basin - Late Albian to Late Cenomanian) and 370 (off Morocco, Late Albian to (?) middle Cenomanian) from the eastern Atlantic in order to better estimate past large-scale hydrological-terrestrial changes in northern South America and NW Africa and their influence on the deposition of black shales in the tropical Atlantic. The project has been designed to achieve the following main goals: • Identification of runoff variations and thus terrestrial climate change during the Late Albian to early Turonian in general and during exceptional palaeoceanographic events (OAE Id, MCE and OAE 2) in particular. • Providing an estimate of terrestrial input into the marine realm at Demerara Rise during the latest Albian to early Turonian. • Testing the conceptual model of arid climates and saline bottom water formations in the tropical Atlantic during the late Cenomanian. • Providing linkages between marine palaeotemperature variations and terrestrial climate. • Estimation of changes in large-scale hydrology and its consequence for the accumulation of organic-rich sediments. • Testing the hypothesis of a significant /pCO2 drop connected to OAE formation.

该项目旨在通过对海洋沉积物进行X射线荧光扫描，对显微组分、植物蜡脂的碳和氢同位素组成以及无机地球化学参数进行分析，从而破译白垩纪中期超级温室世界期间的陆地环境动力学和古海洋学变化。我们的建议将试图回答这些项目所产生的古环境的关键问题。我们期望从陆地和海洋领域的数据的直接相关性，从而产生的机会，以获得在调查的时间片全球变化的全面看法。将在上阿尔比安至下图兰区间进行不同分辨率的分析，以评估各种古海洋事件形成期间的环境和海洋变化。这些事件是最新的Albian Oceanic Anooriginal Event Id（OAE Id），Mid Cenomanian Event（MCE）和Late Cenomanian OAE 2，所有这些都代表了全球碳循环的重大扰动。 将沿OOP 207航段（Demerara隆起）（1258和1260号场地）两个场地的地层拼接沿着进行调查。将对DSDP站点367（佛得角盆地-晚Albian至晚Cenomanian）和370（摩洛哥外海，晚Albian至（？）为了更好地估计南美洲北方和非洲西北部过去的大规模水文-陆地变化及其对热带大西洋黑色页岩沉积的影响，该项目旨在实现以下主要目标：·确定阿尔布纪晚期至土伦纪早期的径流变化，从而确定陆地气候变化，特别是特殊的古海洋事件（OAE Id，MCE和OAE 2）。·提供最新Albian至早期Turonian期间Demerara Rise海洋领域的陆地输入估计。·测试赛诺曼纪晚期热带大西洋干旱气候和咸水底层水形成的概念模型。·提供海洋古温度变化与陆地气候之间的联系。·估计大规模水文变化及其对富含有机物沉积物积累的影响。·检验与OAE形成相关的显著/pCO 2下降的假设。