Sedimentation Processes on the Portuguese Margin: The Role of Continental Climate, Ocean Circulation, Sea Level and Neotectonics

SEDPORT合作项目旨在调查北大西洋和邻近大陆上发生的强烈气候振荡对葡萄牙大陆架和上斜坡的沉积过程和沉积特征的影响。主要目标是与现代平均环境条件相比，更好地确定末次冰期-间冰期过渡期间生物生产力、陆上和海底沉积物输运机制对边缘沉积物覆盖组成和性质的影响。因此，特别强调的问题是，这些沉积过程是如何在不同的气候条件下发生变化的，这些气候条件影响了海洋环流、海平面、大陆风化、植被和降水，从最后一个冰河时代到晚全新世。陆海联系和陆源物质的源汇关系特别令人感兴趣。考虑到内陆和海洋在不同气候条件下运输和沉积过程的重要影响，预计SEDPORT的最终成果将是一个被动边缘的天气性古环境重建，包括海岸带、陆架和斜坡。为此，将从现有档案和新生成的数据中编制陆架和斜坡表面沉积物和沉积物岩心的沉积学和成分参数的综合数据集，并考虑古气候/环境机制进行详细研究。这一切都将与卫星图像研究和颗粒通过水柱运输的文件结合起来，这些文件包括沉积物捕集器的部署、摄像系统、水下遥控潜水器（ROV）以及来自塔古斯河谷的河口沉积物记录。

The collaborative project SEDPORT aims to investigate the impact of strong climatic oscillations that have occured in the North Atlantic and over adjacent continents on sedimentary processes and depositional features on the Portuguese shelf and upper slope. Major goals are to better determine the influence of biological productivity, subaerial and submarine sediment transport mechanism on the composition and properties of margin sediment cover during the last glacial-interglacial transition in comparison to modern mean environmental conditions. Hereby special emphasis is given to the question of how these sedimentation processes may have changed under varying climate conditions that affected ocean circulatoin, sea-level, and continental weathering, vegetation and precipitation since the last Ice Age into the Late Holocene. Land-ocean linkages and source to sink relationship for terrigenous material are of particular interest. A synoptic palaeoenvironmental reconstruction of a passive margin including the coastal zone, shelf and slope, taking into account the significant influence of transport and sedimentation processes under varying climates in the hinterland and the ocean, is anticipated as the final product of SEDPORT. For this purpose, comprehensive data sets of sedimentological and compositional parameters form shelf and slope surface sediments and sediment cores will be compiled form existing archives, newly generated data and studied in detail considering palaeoclimatic/environmental mechanism. This all will be put in context with studies of satellite images and documentation of particle transport through the water column with sediment trap deployments, camera systems, and a underwater remotely operated vehicle (ROV) as well as with an estuarine sediment record from the Tagus valley.