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莫桑比克盆地构造演化与沉积充填特征
高雅1, 唐勇2, 解习农1
1.中国地质大学(武汉);2.自然资源部第二海洋研究所
摘要:
莫桑比克盆地作为最早形成的东非陆缘盆地之一,记录了东非大陆边缘构造演化及冈瓦纳古陆裂解过程的重要信息。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及其沉积充填特征。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。
关键词:  构造演化  沉积充填  莫桑比克盆地  东非大陆边缘
DOI:10.11759/hykx20190312003
分类号:
基金项目:国家重点研发计划课题(2017YFC1405504);国家自然科学基金(No. 41830537,No.41476048)
The Tectonic evolution and sedimentary-filling characteristics of Mozambique basin
GAO Ya1, TANG Yong2, Xie Xinong1
1.College of Marine Science and Technology,China University of Geosciences;2.the Second Institute of Oceanography
Abstract:
As one of the earliest sedimentary basins in the East African continental margin, the Mozambique basin is the key to analyse the tectonic evolution of the East African continental margin as well as the process of the Gondwana break-up. On the basis of related literature reading, combined with various studies and regionally typical seismic profile interpretation, the regionally episodic tectonic evolution in the Mozambique Basin was analyzed . The study shows that the study area is a East African marginal intracontinental rift basin developed in the rifting stage and the depression stage divided by late Jurassic break-up uncomformity. In the rifting stage, the basin is characterize by continental lacustrine sedimentary filling, then gradually change from continental- marine transitional facies to shallow and deep water facies in the depression stage. Two tectonic uplifts of late Cretaceous and Oligocene to Miocene have greatly changed the sediment supply and the sedimentary environment of the basin, Deep-water facies gradually evolved to shoreline facies or delta facies as well.
Key words:  Tectonic evolution  Sedimentary filling  Mozambique basin  East African continental margin
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