华南板块北缘东段武功山加里东期花岗岩特征及成因探讨  

Features and genesis of Caledonian granites in the Wugongshan in the eastern segment of the northern margin of South China plate

作　　者：吴富江 张芳荣 

机构地区：[1]江西省地质调查院,江西南昌330201

出　　处：《中国地质》2003年第2期166-172,共7页Geology in China

基　　金：国土资源大调查项目(200113000011)

摘　　要：华南板块北缘东段武功山地区出露大面积的片麻状花岗岩,前人在该区工作时认为属混合成因的“混合岩”,本次工作证实属同熔性花岗岩。采用岩石谱系单位法进行研究,共划分出5个单元,归并为2个超单元。其成岩年龄(U-Pb法)分别为(462.3±3.2)Ma、(409.4±5.1)Ma,属加里东期造山花岗岩。后又经印支—燕山期伸展滑覆构造的叠加、改造,形成片麻状花岗岩。Gneissic granites are exposed over large tracts in the Wugongshan(Wugong M ountains)in the eastern ' segment on the northern margin of South China.Previous studies suggested tha t these rocks belong to migmatites ' of migmatitic origin.This study has verified that these rocks belong to synt ectonic granites.On the basis of a study of the hierarchical units of the rocks, five units have been distinguished,which may be grouped into two super-units.The rocks have U-Pb ages of462.3 ± 3.2Ma and409.4 ± 5.1Ma respectively,belonging to Caledonian orogenic granites.After their for mation they underwent overprinting and reworking of Indosinian-Yanshanian extens ional-sliding superimposed structure.

关 键 词：华南板块 加里东期 同熔性花岗岩 岩石谱系单位 武功山 成岩年龄 片麻状花岗岩 

分 类 号：P588.121[天文地球—岩石学]