辽宁印支运动新观察

一、前言关于印支运动,黄汲清（1945、1954、1956、1959、1962）赵宗溥（1959）、黄振辉（1966）等人,虽曾多次专文论述,但从未涉及到辽宁。辽宁的印支运动,始由潘广（1963）提出,他认为中朝陆台晚里阿斯期煤系（如北票组及其相当层）广泛沉积在晚二叠世石千峰组及各种更老岩系上的角度不整合接触面,是印支运动的结果,并有岩浆侵入,但否认有三叠纪地层的存在。从1962至1975年间,三叠纪地层在开展区域地质调查中被陆续划分

NEW OBSERVATIONS OF THE INDOSINIAN MOVEMENT IN LIAONING

The Triassic strata in Liaoning may be divided into the Zhengjia Formation of the lower series,the Linjia and Houfulongshan formations of the middle series and the Laohugou Formation of the upper series. The intrusive rocks are divisable into three phases:the first phase is represented by diorites and gabbros-diabases,the second phase is represented by granites or porphyroid ademellites,and the third phase is represented by granites or medium- to fine-grained biotite adamellites. Besides,there are undivided alkaline rocks. According to the stratigraphy,intrusive rocks and contact relationships,the Indosinian movement in Liaoning may be divided into four phases. The first phase took place between the early and middle Triassic,represented by parallel unconformities between the Zhengjia Formation and the Linjia Lormation and expressed by the vertical movement. The second phase took place between the middle Triassic,represented by parallel unconformities between the Linjia Formation and the Houfulongshan Formation and expressed also by the vertical movement. The third phase took place between the nuddle and late Triassic,represented by angular unconformities between the Boufulongshan Formation and the Laohugou Formation and expressed by the horizontal movement; it is the main phase of the Indosinian movement in Liaoning. The fourth phase took place between the late Triassic and early Jurassic,represented by angular unconformities between the Laohugou Formation and the Kuntouboluo Formation and expressed also by the horizontal movement.