安徽洪镇花岗岩类韧性推覆剪切成  

Ductile Thrusting-shearing Genesis of Hongzhen Granitoid, Anhui Province

作　　者：张开均[1] 黄钟瑾[1] 施央申[1] 王良书[1] R.C.BREWER 乔烈光 

机构地区：[1]南京大学地球科学系 [2]DEPARTMENT OF GEOLOGY,UNIVERSITY OF ALABAMA,TUSCALOOSA AL35478,USA [3]安徽省地矿局３２６地质队

出　　处：《兰州大学学报（自然科学版）》1995年第1期87-95,共9页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金

摘　　要：洪镇花岗岩类上覆糜棱岩、混合岩的存在，其本身的低温混合岩化成因特征，以及三者之间在地球化学上的同源继承性，揭示洪镇花岗岩类的韧性剪切成因，其源岩以长英质碎屑岩为主，少量中性熔岩；其形成过程为扬子板块前陆中压深埋推覆岩片在印支晚期的韧性推覆就位，是交代作用为主导，兼之部分熔融的产物。Based on the petrologic, mineralogic and petrochemical studies, the paper proves Hongzhen granitoid is characterized by the autochthonous-parautochthonous transformation.The granitoid source rocks are mainly felsic clastic sediment and a little neutral magmatite in Zhangnbaling Group. The granitoid is covered by the mylonite and migmatite, and the three rocks share the same TEE distribution model and the W-type distribution of transition elements,which indicates that all of them may be from identical source rocks. The granitoid belongs the collision granite or the post-orogenic granitoid and results from the ductile thrusting-shearing at the condition of 550℃ and 700 kpa in the foreland of Yangtze plate during the late Indo-China movement, and from the leading metasomatism with secondary partial melting.

关 键 词：花岗岩 岩石学 岩石成因 

分 类 号：P588.121[天文地球—岩石学]