莫桑比克盆地构造演化与沉积充填特征

在阅读相关文献资料的基础上,分析了莫桑比克盆地的区域性幕式构造演化,并进一步总结归纳了其沉积充填特征。研究显示该盆地为东非边缘陆内裂谷盆地,以晚侏罗世破裂不整合面为界划分为断陷期及坳陷期,断陷期为陆相湖盆沉积充填,进入坳陷期后逐渐从海陆过渡相向浅海相和深水相演变。晚白垩世末和渐新世末两次构造抬升,使得盆地沉积环境及物源供应发生明显改变,也逐渐从深水相向滨浅海相或三角洲相演变。

The tectonic evolution and sedimentary filling characteristics of the Mozambique Basin

In this study, the regionally episodic tectonic evolution in the Mozambique Basin was analyzed based on literature review and regionally typical seismic profile interpretation. The study area considered here is the East African marginal intracontinental rift basin developed in the rifting stage and the depression stage divided by the late Jurassic break-up unconformity. In the rifting stage, the basin was characterized by continental lacustrine sedimentary filling. Afterward in the depression stage, it gradually changed from continental-marine transitional facies to shallow and deep water facies. It was observed that two tectonic uplifts of the late Cretaceous and Oligocene to Miocene greatly changed the sediment supply and the sedimentary environment of the basin. Additionally, deep water facies gradually evolved to shoreline facies or delta facies.