Ocean-continent interactions in the mid Cretaceous Equatorial Atlantic realm

该项目旨在通过XRF扫描分析海洋沉积物中的显微组分、植物蜡脂的碳氢同位素组成和无机地球化学参数，破译中白垩世超级温室世界的陆地环境动力学和古海洋变化。我们的建议将试图回答这些项目引起的古环境关键问题。我们期望对陆地和海洋领域的数据进行直接的关联，从而有机会全面了解所调查的时间段内的全球变化情况。将在上阿尔比亚至下图兰纪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。这些事件是最新的阿尔卑斯大洋缺氧事件ID(OAE ID)、中新生代事件(MCE)和晚更新世OAE 2事件，它们都代表了全球碳循环的主要扰动。将沿着Oop Leg 207(德梅拉拉隆起)(1258和1260)两个地点的地层拼接进行调查。将对367点(佛得角盆地-阿尔卑斯晚期至塞诺莫尼亚晚期)和370点(摩洛哥近海，阿尔卑斯晚期至(？)为了更好地估计过去南美洲北部和非洲西北部的大规模水文-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：·确定阿尔比亚晚期至都灵早期，特别是在特殊的古海洋学事件(OAE ID、MCE和OAE 2)期间的径流变化，从而确定陆地气候变化。·提供最近一次阿尔比安至图罗尼亚早期期间对德梅拉拉隆起海洋领域的陆地输入的估计。·测试关于西诺曼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沉积物积累的影响。·测试与耳声发射形成有关的显著/二氧化碳分压下降的假设。

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.