地质力学学报2018，Vol.24Issue(2)：169-176,8.DOI:10.12090/j.issn.1006-6616.2018.24.02.018
中西非裂谷系形成的动力学机制
DYNAMIC MECHANISM OF RIFT SYSTEMS IN WEST AND CENTRAL AFRICA
摘要
Abstract
The rift systems in West and Central Africa that developed along the shear zone in Central Africa is a series of Mesozoic-Cenozoic rift basins, and their formation mechanism is still a matter of debate.The evolution of those rift systems has three stages, and Early Cretaceous is the most important one for the basin formation,in which the rifts and major fault zones were strongly active.Based on the geological setting of rift systems in West and Central Africa in Early Cretaceous, using linear elastic theory with two dimensional finite element numerical simulation, through the analysis of the stress field and the strain field, reliable evidence to the mechanical mechanism of rift systems are produced.The simulation results suggest that strike-slipping and extensional process coexist in African continent in Early Cetaceous,and the shear zone in Central Africa is not a"transform fault"but a structure that formed and developed simultaneously with the rift systems in West and Central Africa.In Mesozoic-Cenozoic Pangea disintegration period,due to the different motion rates of the three blocks along parallel slip vectors under the unified tectonic stress field and the counterclockwise rotation around WB by African plate, rift systems were formed and developed.关键词
中西非裂谷系/中非剪切带/早白垩世成盆/有限元数值模拟/力学机制Key words
rift systems in West and Central Africa/shear zone in Central Africa/Early Cetaceous basin-forming/finite element numerical simulation/mechanical mechanism分类
天文与地球科学引用本文复制引用
张庆莲,侯贵廷,潘校华..中西非裂谷系形成的动力学机制[J].地质力学学报,2018,24(2):169-176,8.基金项目
中石油勘探开发研究院和国家重点基础研究发展计划"973"项目(2009CB219302) （2009CB219302）
河北地质大学博士科研启动基金项目(BQ201602) （BQ201602）
