安徽大别山响肠超单元的岩石学和地球化学特征及成因探讨  

Discussion of Petrological and Geochemical Characteristics and Formation of Xiangchang Superunit in Anhui Dabie Mountains

作　　者：吴海权[1] 李琴[1] 范董伟 WU Haiquan;LI Qin;FAN Dongwei(Institute of Geological Survey of Anhui Province,Hefei 230001,China;Institute of Geological Surveying and Mapping Technology of Anhui Province,Hefei 230022,China)

机构地区：[1]安徽省地质调查院,安徽合肥230001 [2]安徽省地质测绘技术院,安徽合肥230022

出　　处：《宿州学院学报》2019年第9期66-72,共7页Journal of Suzhou University

基　　金：国土资源部地质大调查资助项目(200013000108)

摘　　要：在前人工作的基础上,结合1∶25万片区—修测,按岩石谱系单位划分原则将安徽大别山地区的司空山岩体(包括湖北部分)、团岭岩体、天柱山岩体、飞旗寨岩体、响肠岩体等复式岩体原1∶5万图幅所建立的单元、超单元、侵入体等进行对比、归并和重新划分,根据岩浆活动的序次及其演化规律,从早到晚将其划分为无愁、店前河、玄风寨、天柱山等四个单元,归并为响肠超单元。该超单元属燕山期岩浆活动的产物,时代为早白垩世。岩石地球化学分析研究表明,该超单元属I型花岗岩系列,兼具S型花岗岩特征,其岩浆主要来源于上地幔衍生物和下地壳岩石的部分熔融物,部分来自上地壳沉积物。该超单元形成于扬子板块与华北板块碰撞造山后的环境,侵位机制总体上表现为强力就位,不同复式岩体的侵位模式则有所不同。On the basis of previous work,combined with 1:250000 area repair,complex rock mass such as Sikongshan rock (including Hubei),Tuanling rock,Tianzhushan rock ,Feiqizhai rock,and Xiangchang rock in Anhui Dabie mountains with 1:50000 map established the unit,superunit and intrusive body which were compared,merged and redivided according to the lithodemic division principle.In sequence,they are divided into four units: Wuchou,Dianqianhe,Xuanfengzhai and Tianzhushan and are merged into Xiangchang superunit which belongs to the products of the magmatic activity in Yanshan period in the early Cretaceous age.The study of rock geochemical analysis shows that the superunit belongs to type I granite series,which has the characteristics of type S granite.The magma is mainly derived from the derivatives in the upper mantle and the melt in the lower crust,partly from the sediments in the upper mantle.The superunit is formed in the environment of the collision between the Yangtze plate and the North China plate,and the emplacement mechanism is forceful in general.Emplacement modes of different complex rock masses are different.

关 键 词：复式岩体 响肠超单元 岩石学和地球化学特征 早白垩世 构造环境 成因机制 

分 类 号：P596[天文地球—地球化学]