相山铀矿田围岩蚀变及成矿流体特征

Wall Rock Alteration and Ore-forming Fluid Characteristics of Xiangshan Uranium Ore Field

相山铀矿田是我国著名的大型火山岩型热液铀矿田。近年来矿田在矿产勘查和科研方面取得了较大进展,在成矿规律与找矿预测中取得了重大成就。笔者在系统收集前人成果资料的基础上,进一步分析梳理了围岩蚀变类型和成矿流体来源,并对常量元素、微量元素及稀土元素与铀矿化之间的关系进行了探讨。研究表明,相山铀矿田蚀变类型可以分为两种:一种为碱性蚀变;另一种为酸性蚀变。其中碱性蚀变主要以钠交代为主,酸性蚀变主要以萤石-水云母型为主,酸性蚀变是成矿后期形成富矿的重要条件。流体包裹体测温数据结果表明,成矿流体属于中-低温、中-低盐度、低密度流体。

The Xiangshan uranium ore field is a famous large-scale volcanic rock type hydrothermal uranium ore field in ChinaIn recent years great progress has been made in mineral exploration and scientific research in this area,and great achievements have been made in theoretical research on metallogenic regularity and prospecting prediction in the area On the basis of systematic collection of previous data,the types of wall rock alteration and the source of ore-forming fluid were further analyzed,and the relationship between constant elements,trace elements and rare earth elements and uranium mineralization were discussed The researches show that the types of alterations in the Xiangshan uranium field can be divided into two types:one is alkaline alteration;the other is acid alteration.The results of fluid inclusion temperature measurement data indicate that the ore-forming fluid belongs to medium-low temperature,medium-low salinity and low-density fluid.The ore-forming fluid in the Xiangshan uranium ore field is derived from magmatic hydrothermal fluid or atmospheric hydrothermal fluid.