摘要
基于地表露头、钻井资料,对四川盆地上三叠统黑色泥页岩的时空分布特征进行了详细的分析。在此基础上,对黑色泥页岩所记录的前陆盆地系统演化过程进行了研究。四川盆地上三叠统黑色泥页岩主要发育在龙门山冲断带的前缘地区,反映了晚三叠世龙门山造山楔的强烈逆冲推覆控制前陆盆地的沉积充填过程。晚三叠世,龙门山造山楔经历了三次较为强烈的造山作用,导致前渊地区快速沉降,形成欠补偿前陆盆地,为须一段、须三段和须五段三套黑色泥页岩的沉积提供了有利条件。四川盆地上三叠统须一段、须三段和须五段黑色泥页岩依次向南东迁移,表明晚三叠世龙门山造山楔具有显著地向南东推覆的特征。
The spatial and temporal distribution characteristic of the Upper Triassic black shales in Sichuan basin have been analyzed based on the outcrop section,drilling and seismic data.The evolution process of foreland basin system recorded by the Upper Triassic black shales has been studied.The Upper Triassic black shales of Sichuan basin deposited in the frontal area of Longmen Shan thrust belt suggest that the strong thrust nappe of Longmen Shan orogenic wedge had controlled the filling process of foreland basin.The Longmen Shan orogenic wedge had experienced three times of strong thrust nappe event,which resulted the rapid subsidence of foredeep and the formation of underfilled foreland basin.The underfilled basin provided enabling environment for the deposition of the 1st,3nd and 5rd member of Upper Triassic Xujiahe Formation.Furthermore,the migrating southeastward of Upper Triassic black shales was supposed to be related to the thrusting of the Longmen Shan orogenic wedge from NW toward SE.
作者
颜照坤
李勇
聂舟
董顺利
任聪
邵崇建
张代柱
叶婷婷
胡文超
YAN Zhao-kun;LI Yong;NIE Zhou;DONG Shun-li;REN Cong;SHAO Chong-jian;ZHANG Dai-zhu;YE Ting-ting;HU Wen-chao(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;School of Earth Sciences,East China University of Technology,Nanchang 330013,China;Key Laboratory of Earth Exploitation and Information Techniques,Chengdu University of Technology,Chengdu 610059,China;Southwest Oil&Gas Field Company,Petro China,Chengdu 610041,China)
出处
《东华理工大学学报（自然科学版）》
CAS
2021年第4期301-308,共8页
Journal of East China University of Technology(Natural Science)
基金
四川省科技计划项目(2019YJ0468)
国家自然科学基金项目(41502116)。
关键词
前陆盆地
晚三叠世
黑色泥页岩
四川盆地
逆冲推覆
foreland basin
Late Triassic
black mudstone and shale
Sichuan basin
thrust nappe
