四川盆地上三叠统构造层序划分及盆地演化CLASSIFICATION OF TECTONIC SEQUENCE AND BASIN EVOLUTION OF THE UPPER TRIASSIC IN THE SICHUAN BASIN
林良彪,陈洪德,胡晓强,纪相田,姜平
摘要(Abstract)：
晚三叠世是四川盆地演化的重要时期。根据野外露头、钻井和地震资料,运用构造层序地层学的思路和方法,对四川盆地上三叠统层序界面、层序划分和层序特征进行深入研究,并建立层序地层格架。研究表明,四川盆地上三叠统可识别出4个层序界面:1)上三叠统与中、下三叠统之间的区域性构造不整合面;2)须二段与小塘子组的分界面;3)须三段与须四段之间的次级构造不整合面;4)三叠系与侏罗系之间的区域性构造不整合面。根据层序界面的发育情况,将研究区划分为3个构造层序,每个层序以最大湖泛面为界,划分为盆地扩张体系域(BE)和盆地收缩体系域(BW)2个体系域。晚三叠世四川盆地的演化主要是川西前陆盆地的演化,其中TS1为边缘前陆盆地演化阶段;TS2为川西前陆盆地形成阶段,龙门山逆冲推覆体开始逆冲推覆;TS3为川西前陆盆地发展阶段,受安县运动的影响,龙门山逆冲褶皱成山,使得整个四川盆地进入了陆相沉积环境。构造运动是控制晚三叠世四川盆地演化的重要因素。
关键词(KeyWords)： 构造层序;盆地演化;上三叠统;川西前陆盆地;四川盆地
基金项目(Foundation): 中石化“十五”重点科技攻关项目(P03044);; 四川省重点学科“构造地质学”建设基金资助项目(SZD0408)
作者(Author): 林良彪,陈洪德,胡晓强,纪相田,姜平
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