摘要
“须家河群”是性质完全不同的两种坳陷沉积物:下盆为大陆边缘坳陷,上盆为强烈造山运动后的前渊坳陷,导致须下盆转交为须上盆的重要构造运动就是安县造山构造运动。安县运动是中国板块与外来板块相撞的重大地质事件,它对四川盆地西部乃至全盆的油气分布,有重要的影响。
The Late Triassic Xujiahe Group in West Sichuan Basin consists of two kinds of ab-solutely different depressed sediments.The lower basin is the depression of continentalmargin while the upper basin is foredeep depression resulted by intensive orogenic move-ment.The important tectonic movement leading to the above mentioned transform inquality now have been proved and is named Anxian orogenic movement(Anxian Move-ment for short),which corresponds to the second episode of the Indo-China movement—Pre-Rhaetic orogenic episode.The 4th and 5th members of the Xujiahe Group are absencein the Longmen Mountains and its foreland area,and the Jurassic Systen overlapped onunconformity,thus leading to the misunderstanding for the movement time,that is,themovement was considered to occur in between the end of the Triassic and the fore ofJurassic for a long time.The Anxian movement is not a locally geological phenomena,buta signficant geological event of Chinese Plate colliding with exotic plate.The foreland ofthe Longmen Mountains is the front edge of intensive zone of the orogenic movement,andthe boundary between back-arc overthrust and regressive arc basin that is the boundarybetween active and stable belts.This movement plays an important role in hydrocarbon dis-tribution to the west part of Sichuan Basin as well as the whole region.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1990年第3期223-234,共12页
Oil & Gas Geology
