隆昌地区辽河群岩石组构分析

PETROFABRIC ANALYSES AND THEIR IMPLICATION OF METAMORPHISlC ROCKS OF LIAOHE GROUF IN LONGCHANG AREA,LIAOYANG

通过对隆昌地区早元古宙辽河群变质岩的组构分析,表明该区经历了四期变形,第一期固态流变构造分布较广,较长期而缓慢的近水平东西向a型顺层剪切导致发生第二期纵弯褶曲,形成吉祥峪—算盘峪复背斜,同时还卷入了由地幔上升沿层间滑脱面挤入的辉长岩。复背斜的西侧在第三期形成北北东向延伸的团山子正断性韧性剪切带,上盘下降,主压应力近垂直于地面,拉伸方向近120°。第四期为隆昌—水泉沟滑覆构造,使大石桥岩组大理岩覆在褶皱了的高家峪岩组之上。

This paper is contributed to the fabric analyses of metamorphic rocks and tectonic analyses in Liaoyang Longchang area.The following conclusions are attained: 1.The deformation of Liaohe group have ocurred four times in early Proterozoic era. 2.The first,solid-state flow structure are discributed widly over Liaohe group in Longchang. 3.The second,near horzontal“a”bedding shear slip long and slowly from east to west,bring about nuckling folding formed flexural slip fold Jixiangyu Suanpanyu anticlinorium and the gabbro from mantle and involved in the anticlinorium at same time. 4.The third,Tuanshanzi normal fault ductile snear belt extened to NNE.The principal compression stres close to vertical to earth's surfdce tensile near 120°. 5.Fourth,Longchang Shuiquangou gliding nappe structure slipped level from east to west so the marble of Dashiqiao formation covered the folding rocks of Gaojiayu formation and also covered the Tuanshanzi normal fault ducetile shear helt