Rates, causes, and dynamic of long-term landscape evolution of the South Atlantic passive continental margin, Brazil and Namibia, as revealed by thermo-kinematic numerical modeling

热运动数值模型揭示的南大西洋被动大陆边缘、巴西和纳米比亚长期景观演化的速率、原因和动态

• 批准号: 243810230
• 负责人: Professor Dr. Ulrich A. Glasmacher
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/243810230?language=en
• 关键词: Rates; causes; dynamic; long; term

The aim of the project is to quantify the long-term landscape evolution of the South Atlantic passive continental margin (SAPCM) in SE-Brazil and NW-Namibia. Excellent onshore outcrop conditions and complete rift to post-rift archives between Sao Paulo and Porto Alegre and in the transition from Namibia to Angola (onshore Walvis ridge) allow a high precision quantification of exhumation, and uplift rates, influencing physical parameters, long-term acting forces, and process-response systems. The proposed research project will integrate the published thermochronological data from Brazil and Namibia, the new detailed and spatially dense thermochronological data set revealed by the DFG-financed research project and test lately published new concepts on causes of long-term landscape evolution at rifted margins. The climate-continental margin-mantle coupled process-response system is caused by the interaction between endogenous and exogenous forces, which are related to the mantle process driven rift to drift to passive continental margin evolution of the South Atlantic, and the climate change since the Early/Late Cretaceous climate maximum. Special emphasis will be given to the influence of long-living transform faults such as the Florianopolis Fracture Zone (FFZ) on the long-term topography evolution of the SAPCM's. A long-term landscape evolution model with process rates will be achieved by thermokinematic 3 D modeling (software code PECUBE and FastCape). Testing model solutions obtained for a multidimensional parameter space against the real thermochronological and geomorphological data set, the most likely combinations of parameter rates, and values can be constrained. The data and models will allow separating the exogenous and endogenous forces and their process rates.

该项目的目的是量化Se-Brazil和NW-NAMIBIA的南大西洋亚洲大陆边缘（SAPCM）的长期景观演变。极好的陆上露头条件和完整的裂谷到圣保罗和波尔图阿特雷格群岛之间的裂谷后档案，以及从纳米比亚向安哥拉（陆上的沃尔维斯山脊）的过渡中，可以对挖掘的高精度量化和提升率，并影响物理参数，影响长期的表演力量，长期的表演力和过程 - 响应系统。拟议的研究项目将整合来自巴西和纳米比亚的已发布的热量数据，这是DFG资助的研究项目揭示的新的详细和空间密集的热量数据学数据集，并测试最近发布了有关Rifted Margins长期景观进化的新概念。气候 - 大陆边缘耦合过程 - 过程响应系统是由内源性和外源性力之间的相互作用引起的，内源性和外源力之间的相互作用与地幔过程驱动的裂痕有关，从而漂移到南大西洋的被动大陆边缘进化，以及自早期/晚期气候气候的早期气候变化以来的气候变化。将特别强调长寿变换断层（例如Florianopolis骨折区（FFZ））对SAPCM长期地形演变的影响。具有过程速率的长期景观演化模型将通过热力学3 d建模（软件代码pecube和fastcape）实现。针对真实热量和地貌数据集的多维参数空间获得的测试模型解决方案，参数速率的最可能组合以及值可以受到限制。数据和模型将允许分离外源性和内源性及其过程速率。