摘要
文章从川西拗陷中生代陆源碎屑岩的物源研究入手,探讨了龙门山推覆构造的活动历史。根据大量的砾石统计、古水流测量、碎屑成分和所含化石的详细鉴定,确定了中生代不同时期碎屑岩的母岩来源、时代、水流方向和大地构造背景,并推演龙门山的崛起与川西拗陷的关系。
This paper is an attempt at approaching the history of nappe structures in Longmenshan Mo-nuntains beginning with the provenance research on Mesozoic clastic rocks in Western Sichuan Depres-sion. The provenances and ages of the source rocks, the directions of paleocurrents as well as the tec-tonic setting are determined by the statistics for pebbles, the measurement at paleocurrents and detailedidentification for detrital compositions and fossils. Then the relationship between the rise of Longmen-shan Mountains and the subsidence of Western Sichuan Depression can be infered.
关键词
川西
拗陷
沉降
龙门山
崛起
Longmenshan Mountains
Western Sichuan Depression
Mesozoic
clastic rock
provenance study
nappe
