华北中北部高级变质岩区的构造区划及其晚太古代构造演化  

Tectonic Division of High Grade Metamorphic Terrain and Late Archean Tectonc Evolution in North central part of North China Craton

作　　者：李江海[1,2] 钱祥麟[1,2] 翟明国[1,2] 郭敬辉[1,2] 

机构地区：[1]北京大学地质学系 [2]中国科学院地质研究所

出　　处：《岩石学报》1996年第2期179-192,共14页Acta Petrologica Sinica

基　　金：国家自然科学基金

摘　　要：通过区域构造编图及重点地段的详细研究，在华北克拉通中北部识别出一条ＮＮＥ向的构造带——龙泉关－桑干带，它以大规模的韧性剪切带网络、重熔钾质花岗岩带、数量众多的高压麻粒岩构造透镜体或岩片为特征。剪切带以低角度逆冲为主，矿物拉伸线理指示运动方向为ＮＷ－ＳＥ向。这些剪切带造成东西两侧基底杂岩与表壳岩系包括孔兹岩系的广泛构造叠置，以及高压麻粒岩的近等温减压上隆。从更大的范围看，龙泉关－桑干带处于鄂尔多斯克拉通和阜平－赞皇克拉通之间，并且被五台－吕梁裂谷型绿岩带截切或不整合覆盖。该带应形成于晚太古代。After regional tectonic map complition and detail observation at key sections, the Longquanguan Sanggan tectonic belt(LSB)trending in NNE direction is recoginzed in the central part of North China Craton and is characterized by large scale ductile shear zones, granitic belt and numerous high pressure granulite lenses or slices. The shear zones are dominated by thrusting in NW-SW direction,resulted in imbrication of basement complex with supracrustal sequences including khondalite series,and isothermal decompression and uplift of high pressure granulites.Regionally,LSB joints Ordos craton with Fuping Zanhuang craton, which are chiefly composed of Archean TTG granitic rocks khondalites and TTG granitic rocks supracrutal sequences respectively, recorded late Archean tectonic syntaxis process.

关 键 词：变质岩区 构造区划 晚太古代 构造演化 华北地区 

分 类 号：P588.3[天文地球—岩石学]