摘要
侏罗纪时东南亚大陆上形成两个大盆地,西为海相盆地,东为陆相红盆。白垩纪时大盆地闭合或解体。第三纪出现裂谷盆地,其发育受燕山期构造格局控制;拉张应力自南向北变弱,裂谷发育自南向北变晚。第四纪为上叠盆地阶段。滇西与泰国各时期盆地的对比研究有助于更好地认识其演化特征,恢复东南亚大陆侏罗纪以来不断碎裂、局部解体的历史。
Two giant basins were developed on the unified SE Asian continent after Indosinian movement. A continental basin was formed in the border area between Thailand, Cambodia and Laos during Late Triassic and Early Jurassic and stretched to Simao-Lanping area in Middle Jurassic. The Late Mesozoic red beds could be well correlated in the basin, but the boundary fault in Eastern Thailand seems to act a more important role in the basin development. The unified basin might be disintegrated in Late Cretaceous by the Yanshan movement. A marine basin formed in Sumatra, the Malay Peninsula and the border region of Thailand and Burma during Early Jurassic and extended to the westmost part of Yunnan during Middle Jurassic. Between both these basins an uplift has occurred and might be enlarged during Creta-ceous with closing of the marine basin. However, the uplift in West Yunnan might be gentle, sometimes only a submarine one.The Tertiary basins in Thailand are clearly controlled by the Yanshanian tectonic framework. The N-S oriented grabens in West Yunnan and North-Central Thailand may reflect a tensile stress field which is marked by opening of the Gulf of Thailand. The rifting might become weakened and later northwards, namely, the rifts in the Gulf and Central Plain were developed mainly since Oligocene, with Miocene volcanism and middle Miocene marine sediments found in the Gulf; the rifts in Northern Thailand developed mainly in Miocene, with lacustrine fills and Pliocene basalts; in Western Yunnan, only isolated down-faulted basins developed principally in Pliocene, filled with lakebog facies sediments and limited volcan-ics. In addition to the S-N tension faults, the dextral NW-SE strike-slip faults in Thailand might promote the basin development.The Quaternary superposed basins were developed on the Tertiary rifts in the Central and Northern Thailand. The Chao Phraya Basin may be the best one. The similar basins can beobserved in Western Yunnan.
出处
《地质科学》
CAS
CSCD
北大核心
1991年第4期359-368,共10页
Chinese Journal of Geology(Scientia Geologica Sinica)
关键词
盆地
侏罗纪
第四纪
云南
泰国
Basins, Yanshanian movement, Himalayan orogeny, Thailand, Western Yunnan
