The influence of tectonic, climate and ocean circulation on sediment transport and deposition in the western South Atlantic during the past 60 mill years

构造事件和气候变化对沉积物沉积具有直接影响（例如，通过侵蚀提供沉积物，增加初级产量）和间接影响（例如，门户的打开/关闭以及由此改变的海洋环流，通过隆起/下沉对气候的反馈）。因此，对大陆边缘沉积特征的研究为区域构造和气候演化提供了有价值的信息。我们的目标是解决阿根廷大陆边缘气候和海洋环流的变化，这是由气候（如南极冰盖形成，中新世中期气候最佳MMCO等）和构造（安第斯山脉的上升及其对气候的反馈，里约热内卢大隆起的就位，德雷克海峡的开通，中美洲海道CAS的关闭）过程的变化引起的。由上升的安第斯山脉提供的沉积物质部分沉积在大陆架上形成的南大西洋盆地中，部分直接沉积在斜坡上，上升和深海中，在那里被洋流带走，这是全球温盐环流的重要组成部分。沉积的物质代表了下坡和顺坡泥沙相互作用的档案。通过对地震数据的分析，我们将获得关于从大陆进入海洋的沉积物通量和海洋环流变化的信息，从而得出关于气候变化的结论。这里提出的项目与Anka等人提出的“阿根廷北部-乌拉圭大陆边缘的长期演化：对里约热内卢de la Plata河沉积物输入历史和油气生成和泄漏的影响”形成了紧密的联系，这将解决与陆上-海上盆地动力学相关的问题。

Tectonic events and modifications in climate have a direct (e.g. supply of sediment via erosion, increase of primary production) and indirect (e.g. opening/closure of gateways and hence modification of oceanic circulation, feedback on climate via uplift/subsidence) influence on sediment deposition. The study of sedimentary features at the continental margin thus provides valuable information on the regional tectonic and climatic evolution. We aim at resolving modifications in climate and oceanographic circulation at the Argentine continental margin, which result from variations in both climatic (e.g. Antarctic ice sheet formation, Mid Miocene Climate Optimum MMCO, etc.) and tectonic (rise of the Andes with its feedback on climate, emplacement of the Rio Grande Rise, opening of Drake Passage, closure of Central American Seaway CAS) processes. Sedimentary material provided amongst others by the rising Andes is deposited partly in the South Atlantic basins formed on the shelf and partly directly on the slope, rise and in the deep sea, where it is picked-up by oceanic currents, which represent an important element of the global thermohaline circulation. The deposited material represents an archive of the interplay of down-slope and along-slope sediment transport. Via the analysis of seismic data we will gain information on sediment flux from the continent into the ocean and variations in the oceanic circulation allowing conclusions on modifications in climate.The project proposed here forms a strong link to proposal 'Long-term evolution of northern Argentine-Uruguay continental margin: implications on the sediment input history of Rio de la Plata River and hydrocarbon generation and leakage' by Anka et al., which will tackle questions related to onshore-offshore basin dynamics.