Thermal history, exhumation, uplift, and long-term landscape evolution of the western south Atlantic passive continental margin, Brazil and Namibia-Angola

南大西洋西部被动大陆边缘、巴西和纳米比亚-安哥拉的热历史、折返、隆升和长期景观演化

• 批准号: 79336507
• 负责人: Dr. Andrea Förster
• 金额: --
• 依托单位: Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum (GFZ)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/79336507?language=en
• 关键词: Thermal; history; exhumation; uplift; long

The aim of the project is to quantify the temperature, exhumation, uplift, and long-term dynamic topography evolution of the South Atlantic passive continental margin (SAPCM) in Brazil and Namibia-Angola. 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 long-term processes and process-response systems. We will integrate the published thermochronological data from Brazil and Namibia. This climate-continental margin-mantle coupled process-response system is caused by the interaction between endogenic and exogenic forces, which are related to the mantle-process driven rift – drift – “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 dynamic topography evolution of the SAPCM s. A combination of apatite and zircon fission-track and (U-Th)/He thermochronological data with modeling of t-T path´s will determine the thermal, exhumation, and uplift history. A long-term landscape evolution model with process rates will be achieved by thermo-kinematic 3-D modeling (software code PECUBE). 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 to separate the exogenic and endogenic forces and their process rates. In a continuation of the research (2013-2016), strong emphasis will be given to the integration of all existing and published data (including those data of other SPP-research projects) in a numerical model for the long-term landscape evolution to quantify the surface response rates.

该项目的目的是量化巴西和纳米比亚-安哥拉南大西洋被动大陆边缘（SAPCM）的温度、剥露、隆起和长期动态地形演变。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，允许对长期过程和过程响应系统进行高精度量化。我们将整合巴西和纳米比亚公布的热年代学数据。这一气候-大陆边缘-地幔耦合过程-响应系统是由内、外动力相互作用引起的，与地幔过程驱动的南大西洋裂谷-漂移-“被动”大陆边缘演化和早、晚白垩世气候极大期以来的气候变化有关。特别强调的是长期生活的转换断层，如弗洛里亚诺波利斯断裂带（FFZ）的长期动态地形演化的SAPCM的影响。磷灰石和锆石裂变径迹和（U-Th）/He热年代学数据与t-T路径建模的结合将确定热、折返和隆升历史。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）。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。这些数据和模型将允许分离外生和内生力及其过程速率。在研究的继续（2013-2016年）中，将着重强调将所有现有和公布的数据（包括其他SPP研究项目的数据）整合到长期景观演变的数值模型中，以量化地表响应率。