重庆玉峡式锶矿床成矿系统分析

Analysis of metallogenic system of Yuxia-style Sr ore deposit

玉峡式锶矿床作为渝西锶成矿带最具工业价值的矿床类型,对其成矿系统的研究对今后该地区的找矿工作具有十分重要的指导意义。本文结合前人研究资料,从源、运、储、保四个方面对其成矿系统进行论述并作出概述性总结,认为玉峡式锶矿床是各成矿要素在一定时空域中耦合的产物。海相碳酸盐-硫酸盐沉积、沉积建造中的热卤水、含锶岩石的风化为玉峡式锶矿床的形成提供了丰富的成矿物质来源;华蓥山基底断裂和地热系统为含锶卤水的运移提供了通道和热源;华蓥山东侧的西山背斜为含锶卤水的卸载沉淀创造了适当的物化条件和良好的矿体就位空间;矿床自身物化性质和保存条件决定了玉峡式锶矿床保存程度欠佳。

Yuxia-style Sr ore deposit is the most economic deposit type in the Sr-metallogenic zone in west Chongqing,so what study on its metallogenic system is of great scientific value and economic significance.Under the study on geological information,this paper summarizes metallogenic system in four factors：Sr-source,Sr-transport,Sr-accumulation,Sr-preservation.Marine carbonate-sulfate sediments,hot brine of sedimentary formation,weathering of Sr-bearing rock provide plenty of sources for formation of deposits.Huaying mountain basement fault and geothermal system provide transport channels and heat source.Xishan anticline on the east of it creates the appropriate physiochemical conditions and good emplacement room for metallogenic fluid.The physicochemical properties and preservation conditions determine the poor preservation of deposits.