兰坪—思茅中生代盆地的特征及构造演化

CHARACTERISTICS AND TECTONIC EVOLUTION OF THE LANPING-SIMAO MESOZOIC BASIN

陈跃昆 廖宗廷 魏志红 李明辉

CHEN Yao-kun LIAO Zong-ting WEI Zhi-hong LI Ming-hui

同济大学 海洋与地球科学学院, 上海 200092 2. 中国石化 南方勘探开发分公司, 云南 昆明 650200

School of Ocean and the Earth Sciences, Tongji University, Shanghai 200092, China 2. Southern Petroleum Exploration and Development Division Company, SINOPEC, Kunming, Yunnan 650200, China

兰坪—思茅中生代盆地发育于滇西古特提斯多岛洋构造格局基础之上,其形成演化与特提斯—三江造山带的构造演化密切相关。中三叠世,伴随中特提斯洋开启,地壳拉张裂陷,兰坪—思茅中生代盆地开始形成。晚三叠世末—早侏罗世,由于受中特提斯关闭引起的造山运动的影响,下侏罗统普遍缺失。从中侏罗世开始,由于新特提斯洋开启,盆地再次下沉接受中侏罗统—白垩系的沉积。喜马拉雅造山运动期间,该区地壳大面积隆升,兰坪—思茅盆地遭受强烈变形,形成具有明显特征的对冲构造,继而在中生代盆地基础上叠加了新生代的拉分盆地。构造演化控制了盆地的沉降作用、沉积作用、火成活动和构造格架。

The Lanping-Simao Mesozoic Basin is a sedimentary basin which was developed based on the Paleo-Tethys multi-island ocean framework,and its formation and evolution are closely related to the tectonic evolution of the Tethys-Sanjiang orogenic belt.The prototype basin was formed during the Middle Triassic accompanying the open of the Mid-Tethys Ocean.The closing of the Mid-Tethys made the crust deformed and the Lower Jurassic missed universally during the end of the Late Triassic to the Early Jurassic.The Neo-Tethys opened during the Middle Jurassic.It made the basin subside again and accept the Middle Jurassic-Cretaceous deposit.Himalayan orogenic movement made the Neo-Tethys closed,and the crust uplifted large scale when the basin was deformed to form fractures,folds and characteristic ramp structures.Then the Cenozoic pull-apart basin superposed on the Mesozoic basin.The tectonic evolution controlled the subsidence,sedimentation,pyrogenesis and structure framework of the basin.

https://doi.org/10.11781/sysydz200403219