摘要
根据对近年来区域地质、多种地球物理资料和深钻井资料的综合研究，认为四川盆地属扬子板块，岩石圈巨厚，最厚可达２００ｋｍ。川西高原属青藏板块的东缘，同时位于中国南北构造带中段，软流圈呈北东向上隆，岩石圈减薄，其最薄处厚度约７０ｋｍ左右。四川盆地的基底由结晶基底与沉积岩变质基底组成，上震旦统为该地区在扬子古板块形成后的第一套沉积盖层。基底的性质、厚度、埋深在不同地区各不相同，从而决定了盆地内部构造区的划分。基底深断裂对盆地的形成与盖层构造的发展也有重要的控制作用。
Based on regional geology,various geophysical surveys and deep well data,some new progresses about the deep structures of Sichuan basin have been acquired as fol-lows:Sichuan basin belongs to Yangtzi plate. Its lithosphere is greatly thick.In someplaces its thickness may rise up to 200km. The plateau of western Sichuan belongs to theeastern Tibet-Qinghai plate,it is located at the middle section of structural belt of Chi-na. Below its lithosphere,the asthenosphere has been uplifted in NE direction and thelithosphere becomes thinner with the least thickness being about 70km.The basement ofSichuan basin consists of crystalline basement and metamorphic sedimentary basement.The upper Sinian series is the first sedimentary capping bed in Sichuan basin after forma-tion of the ancient Yangtzi plate.The nature,thickness and depth of the basement are various within different sections of Sichuan basin,that makes thestructural division rec-ognizable.In addition,the basement faults impact the formation of basin and the develop-ment of cover greatly.
出处
《地学前缘》
EI
CAS
CSCD
1995年第4期231-237,共7页
Earth Science Frontiers
基金
"八五"国家重点攻关项目
自然科学基金
关键词
四川
基底构造
岩石圈结构
盆地
深部地质
Sichuan basin,basement,deep geological structure,depression
