安徽大别山地区潜山片麻岩套的地球化学特征及构造环境探讨  

Geochemical Characteristics and Tectonic Environment of Qianshan Gneiss Suite in Dabieshan Area in Anhui Province

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作  者:吴海权[1] 吴维平[1] 李琴[1] 杨娟[1] WU Haiquan;WU Weiping;LI Qin;YANG Juan(Geological Survey Institute of Anhui Province,Hefei 230001,China)

机构地区:[1]安徽省地质调查院,安徽合肥230001

出  处:《宿州学院学报》2023年第9期27-34,共8页Journal of Suzhou University

基  金:国土资源部地质大调查资助项目(200013000108)。

摘  要:结合1∶25万片区修测,参照岩石谱系单位划分原则从安徽大别山地区原大别山群中解体出来的变质变形侵入体进行划分、归并;按照形成的时间顺序,将其划分为河图铺片麻岩、撞钟河片麻岩和水吼岭片麻岩,归并为潜山片麻岩套,并对其岩石学、岩石化学、地球化学特征和同位素年代学等作了阐述。潜山片麻岩套的花岗质岩石形成于新元古代,经历了印支期的超高压和高压变质作用,可能还受到加里东期构造热事件的影响,形成于陆内构造环境,以I型花岗岩为主,部分为A型花岗岩,其岩浆来源于上地幔衍生物和下地壳岩石的部分熔融以及分离结晶的产物。Combined with 1∶250,000 area-repair survey,the metamorphic deformation intrusions disintegrated from the original Dabieshan group in Dabieshan area in Anhui Province are divided and merged according to the division principle of rock pedigree units.According to the time sequence of formation,it can be divided into Hetupu gneiss,Zhuangzhonghe gneiss and Shuihouling gneiss,and merged into Qianshan gneiss suite.The petrology,petrochemistry,geochemistry and isotope chronology in the Qianshan gneissic suite were expounded.The granitic rocks of the Qianshan gneissic suite were formed in the Neoproterozoic and experienced the ultrahigh pressure and high pressure metamorphism in the Indosinian period.They may also be affected by the Caledonian tectonic thermal event and formed in the intracontinental tectonic environment.They are mainly I-type granites and partly A-type granites.The magma comes from the partial melting and crystallization of the upper mantle derivatives and lower crust rocks.

关 键 词:潜山片麻岩套 岩石地球化学特征 成因机制 构造环境 同位素年代 安徽大别山地区 

分 类 号:P596[天文地球—地球化学]

 

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