湖南产铀花岗岩体的某些特征

湖南产铀花岗岩体主要分布在湘南和湘东南地区,属扬子板块南缘至华夏板块湘东南加里东褶皱区,主要有诸广山、九嶷山、苗儿山等产铀岩体,岩体是由志留、三叠纪、侏罗―白垩纪岩浆侵入体构成的大型复式花岗岩体,花岗岩具有富碱、富钾和铁镁成分较高的特征,原始铀含量高,铀钍分异明显,铀趋向侏罗纪补体富集,在较晚期次侵入体的内外接触带是铀成矿有利空间。

Certain features of uranium-bearing granite bodies in Hunan

Uranium-bearing granite bodies of Hunan are mainly distributed in the south and southeast area of Hunan Province,which is part of Caledonian fold zone in southeastern Hunan and at the southern margin of the Yangtze plate and Cathaysian plate.This area contains uranium-bearing rock mass such as Zhuguangshan, Jiuyishan and Miao'ershan.The rock mass basically consists of large-sized complex granite bodies which are composed of Silurian,Triassic,and Jurassic-Cretaceous intrusive bodies.The granite is characterized by rich alkali and potassium and high Mg and Fe content,and it has high initial uranium content with obvious differ-entiation between uranium and thorium.Uranium tends to be enriched towards Jurassic complement.The favorable space for uranium mineralization is the internal or external contact zone of intrusive bodies at later stage.