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巴西东南部和纳米比亚西北部南大西洋被动大陆边的长期景观演变。在圣保罗和波尔图阿莱格雷之间以及从纳米比亚到安哥拉（陆上沃尔维斯海岭）的过渡段，出色的陆上露头条件和完整的裂谷到裂谷后档案，允许对剥露和抬升速率、影响物理参数、长期作用力和过程响应系统进行高精度量化。拟议的研究项目将综合巴西和纳米比亚公布的热年代学数据、DFG资助的研究项目揭示的新的详细和空间密集的热年代学数据集，并测试最近公布的关于断裂边缘长期景观演变原因的新概念。气候-大陆边缘-地幔耦合过程-响应系统是由内、外源力相互作用引起的，与地幔作用驱动的南大西洋裂谷漂移到被动大陆边缘演化，以及早/晚白垩世气候极大期以来的气候变化有关。将特别强调弗洛里亚诺波利斯断裂带（FFZ）等长寿转换断层对SAPCM长期地形演化的影响。一个长期的景观演变模型与过程速率将实现热动力学三维建模（软件代码PECUBE和FastCape）。测试模型的解决方案获得了一个多维参数空间对真实的热年代学和地貌数据集，最可能的组合参数率，和值可以受到约束。数据和模型将允许分离外生和内生力量及其过程速率。