Lithospheric structure of the West and Central African Rift Zone and links to the Bangui magnetic anomaly

西非和中非裂谷带的岩石圈结构及其与班吉磁异常的联系

• 批准号: 441292957
• 负责人: Professor Dr. Jörg Ebbing
• 金额: --
• 依托单位: Arbeitsgruppe Satelliten- und Aerogeophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/441292957?language=en
• 关键词: Lithospheric; structure; West; Central; African

This project proposal addresses the lithospheric structure underlying the West and Central African Rift System (WCARS) by statistical analysis and integrated modelling of multiple geophysical data sets. In addition, the project aims at a new understanding of the source of the Bangui magnetic anomaly, one of the broadest and most intense magnetic anomalies of the Earth. Different theories of the structure and evolution of both the WCARS and the Bangui anomaly exist, but base often on single geophysical data analysis or on (lithospheric) models with relatively high uncertainty.Therefore, the purpose of this project is to (i) define lithospheric domains by cluster analysis of among other gravity and magnetic data and seismic tomography models, in order to generate a detailed understanding of the structure (ii) of the crust and (ii) upper mantle under the WCARS by joint inversion of satellite gravity data with seismic tomography, which ultimately can be assessed for the thermal and compositional structure of the area. From the models we can derive a Curie isotherm depth as proxy for (iv) analysis of the source of the Bangui anomaly and again, we can use the results of the lithospheric domain analysis to define possible domains for the magnetic inversion.

本项目提案通过对多个地球物理数据集进行统计分析和综合建模，探讨西非和中非裂谷系的岩石圈结构。此外，该项目的目的是重新认识班吉磁异常的来源，这是地球上最广泛和最强烈的磁异常之一。关于WCARS异常和班吉异常的结构和演化存在不同的理论，但往往基于单一的地球物理资料分析或基于因此，本项目的目的是（i）通过对其他重力和磁力数据以及地震层析成像模型进行聚类分析，通过卫星重力数据与地震层析成像的联合反演，详细了解WCARS下的（二）地壳结构和（二）上地幔结构，最终可以评估该地区的热结构和成分结构。从模型中，我们可以得到一个居里等温线深度作为代理（四）班吉异常的来源分析，并再次，我们可以使用的岩石圈域分析的结果，以确定可能的域的磁反转。