桐柏—大别山构造混杂岩带对比研究  

COMPARATIVE RESEARCH OF TECTONIC MELANGE BELT IN TONGBAI DABIE MOUNTAINS

作　　者：金维浚[1] 宋鸿林 马文璞 

机构地区：[1]中国科技大学研究生院 [2]地矿系

出　　处：《现代地质》1996年第3期372-381,共10页Geoscience

基　　金：国家教委博士点基金

摘　　要：桐柏—大别山造山带地球化学、变质作用以及野外地质调查研究表明：七角山岩组和浒湾岩组是具有相似构造环境、形成于晋宁期的构造混杂岩。高压榴辉（闪）岩原岩是形成多种构造环境的变玄武岩，桐柏固庙、信阳柳林高压榴闪岩的发现说明区内高压变质带沿北坡向西延伸。定远岩组、随县岩群、耀岭河岩群反映了板块拼合后所形成的陆内裂谷。Field investigation and the study of geochemistry and metamorphism show that Qijiaoshan and Huwan formations are melanges formed in a similar tectonic setting during Jinning period. The protogenes of eclogites in the melanges were basalts formed in various tectonic setting. Our recent field investigation found new retro eclogites crops at Germu, Tongbai county, Liulin and Xinyang city. This may illustrate that the high pressure metamorphic belt extends westward along the northern part of Dabie Tongbai mountains. The metavolcanic rocks of Dingyuan Formation, Suixian group, Yaolinghe group were formed in continental rift and volcanic arc after the cessation of subduction.

关 键 词：混杂岩带 地球化学 大别山 桐柏地区 区域构造 

分 类 号：P588.36[天文地球—岩石学] P548.2[天文地球—地质学]