Circum-Antarctic Stratigraphy and Paleobathymetry: Development of Grid-based Simulations

环南极地层学和古水深测量：基于网格的模拟的发展

• 批准号: 44931058
• 负责人: Professor Dr. Karsten Gohl
• 金额: --
• 依托单位: Sektion Geophysik
• 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 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/44931058?language=en
• 关键词: Circum; Antarctic; Stratigraphy; Paleobathymetry; Development

Paleoceanographic models of the Southern Ocean suffer from missing boundary conditions which describe accurately the geometries of the seafloor surfaces at their geological epoch and their dynamics over long time-scales. This results in uncertain estimates of the onset and paleoclimate consequences of the deep-water openings of the Drake Passage and the Tasmanian Gateway. The development and implications for deflections of major deep-sea current systems, e.g. the Antarctic Circum-Polar Current (ACC), through structural obstacles such as oceanic plateaus and ridges is also not described due to lacking reconstructions of their bathymetric growth. As the reconstruction of the changing sediment cover is the largest missing component for accurate paleobathymetric models, a unified circum-Antarctic digital stratigraphic grid from continental shelves to the abyssal plains will be generated in this project by integrating the large seismic data basis of the Antarctic Seismic Data Library System (SDLS) and data from international cooperation partners as well as drill information where available. This grid will then be used to calculate a series of circum-Antarctic paleobathymetric grids in which newest plate-kinematic models, lithospheric subsidence curves and models of dynamic mantle topography are incorporated. Finally, paleoceanographic and paleoclimate scenarios will be simulated using this paleobathymetric grid with particular emphasis on the opening of the Drake Passage and Tasmanian Gateway and the paleo-current dynamics along the continental shelves, slopes and rises.

南大洋的古文学模型遭受缺失的边界条件，这些条件准确地描述了其地质时期海底表面的几何形状以及长时间尺度上的动力学。这导致了对Drake Passage和Tasmanian Gateway的深水开口的开始和古气候后果的不确定估计。对主要深海当前系统的偏转的发展和含义，例如由于缺乏对其测深生长的重建，也未描述南极偏振电流（ACC），即海洋高原和山脊等结构性障碍。由于不断变化的沉积物覆盖物的重建是准确的古气管学模型的最大缺失组件，因此将通过整合反抗击地震数据图库系统（SDLS）和国际上数据的大型地震数据基础，从而在该项目中生成一个统一的环境数字地层网格，从大陆架到深渊平原产生。然后，该网格将用于计算一系列环境 - 抗心疗法网格，其中最新的板旋化模型，岩石圈沉积曲线和动态地幔地形的模型都被合并。最后，将使用此古气候网格模拟古环境和古气候场景，特别着重于Drake Passage和Tasmanian Gateway的开放，以及沿大陆架子，斜坡和上升的古流动动力学。