华南古岩溶型铀矿床矿物学及其矿床成因意义  

MINERALOGY OF PALEOKARST HOSTED URANIUM DEPOSITS AND ITS GENETIC SIGNIFICATIONS IN SOUTH CHINA

作　　者：闵茂中[1,2,3] 王湘云[1,2,3] 沈保培 文光斗[1,2,3] 樊涛 江仪 张国文 黎旭畅 

机构地区：[1]南京大学地球科学系 [2]核工业中南303大队 [3]核工业中南307大队

出　　处：《中国岩溶》1997年第3期251-258,共8页Carsologica Sinica

基　　金：国家教委博士点科研基金;核工业地质总局和中南地勘局专项科研基金;中国科学院矿床地球化学开放研究实验室基金

摘　　要：华南古岩溶铀矿床的矿物学特征为：表生矿物发育，原生成矿矿物少见；矿化脉体几乎没有；矿石中铀主要呈吸附状态，其次呈显微和超显微沥青铀矿存在。与古岩溶有关铀矿床则出现典型低中温热液矿物组合，矿化脉体期次分明，矿石中铀基本呈可见状沥青矿存在，沥青铀矿具有热液成因标型。鉴于该类矿床成矿前主岩溶为冷水成因，而热液成矿流体是与岩溶无关的体系。Paleokarst hosted uranium deposit located in south China mainly includes three types, viz.No.387(large tonnage), No.373(large tonnage) and No.3701(middle tonnage) U deposit. These U deposits are hosted in dissolution caves, dissolution collapse breccias in unmetamorphosed platform carbonate rocks.The deposits called paleokarst type U deposit may be divided into paleokarst deposit, which is represented by No.373 deposit, and paleokarst related U deposit,represented by No. 387 and No.3701 deposits. The mineralogical features of paleokarst U deposits are:with abundant supergene minerals and few original ore minerals, without mineralizing veins and veinlets,and the uranium in the ores mainly in the form of adsorption,and secondly in micro ultramicro grained pitchblende. The features of paleokarst related U deposits are: with a typical low middle temperature hydrothermal mineral association and obvious stages of mineralizing veins, and the uranium mainly in pitchblende that has the typomorphic characteristics of hydrothermal genesis. Because the dissolution vugs,caverns and breccias in the three U deposits were developed by cool water, and the mineralizing solution was not related to the paleokarst, these types of deposits are the superimposed hydrothermal deposits on the paleokarst.

关 键 词：古岩溶 铀矿床 矿物学 矿床成因 

分 类 号：P619.140.4[天文地球—矿床学] P619.140.1[天文地球—地质学]