Understanding the Driving Factors of the Oceanic Anoxic Event 1A (Early Aptian) - The Continental and Neritic Perspective

海洋缺氧事件（oae）代表了全球碳循环中被广泛研究的异常。oae -同时期浅水环境的研究现在越来越被视为一种有趣的补充方法，但也不是没有问题。台地淹没是特提斯北部早期阿普梯人的特征，而特提斯南部边缘（阿曼）的不平衡相和持续的浅水沉积则为c旋回扰动的潜在原因提供了重要信息。在项目的头两年，实地工作的重点是特提斯中部（克罗地亚，伊斯特拉）和特提斯北部（法国，上萨瓦省）的露头。在本项目的基础上，结合前人的研究，观察了下阿普tian浅水相的纬度变化，阿曼和伊斯特利亚的oae1 -同世岩性为lithocodium - bacinella主导相，法国为lithocodium - bacinella贫乏相和台地淹没。这两种端元相类型之间的过渡带在地理和岩性上都没有得到很好的约束。在项目的第三年，我们建议研究葡萄牙西部（大西洋域）的Barremian上段和Aptian下段，它们具有两种平台模式的属性（即以lithocodium - bacinella为主的相，然后是平台淹没）。葡萄牙剖面提供了下阿普天浅水沉积纬向变化的重要信息。

Ocean-wide anoxic events (OAEs) represent intensively investigated anomalies in the global carbon-cycle. The study of OAE-coeval shallow water settings is now increasingly seen as an interesting complementary approach, but one that is not without problems either. Whereas platform drowning characterizes the Early Aptian of the northern Tethyan margin, out-of-balance facies and ongoing shoalwater sedimentation at the southern Tethyan margin (Oman) bears important information on potential causes of C-cycle perturbations. In the first two project years, fieldwork focussed on outcrops in the central Tethys (Croatia, Istria) and the northern Tethys (France, Haute Savoie). Based on this project and previous studies, a latitudinal change in Lower Aptian shoalwater facies is observed with OAE1a-coeval Lithocodium-Bacinelladominated facies in Oman and Istria and Lithocodium-Bacinella-poor facies and platform drowning in France. The transition zone between these two end-member facies types is poorly constrained both geographically and lithologically. For the third project year, we here propose to investigate uppermost Barremian and Lower Aptian section in western Portugal (Atlantic domain) that share attributes of both platform modes (i.e., Lithocodium-Bacinella-dominated facies followed by platform drowning. It is proposed that the Portuguese sections provide important information on latitudinal changes in Lower Aptian shallow-water sedimentation.