我国重晶石矿床成因及成矿远景综述

ORIGINATION AND ORE-FORMING PROSPECTS OF BARITE DEPOSITS IN CHINA

我国重晶石矿床的形成受大陆裂谷系、弧-盆系和陆内挤隆系三种大地构造环境控制，多数矿床形成于大构造旋回的早期阶段，并与一定的岩相古地理环境及岩浆活动有关。矿床可划分为外生成因[沉积型、风化（残积坡积）型]和内生成因（火山-沉积型、层控型、热液型）等不同类型。成矿之钡源主要来自深部的火山-气液。矿床多在中、低温，弱酸性向弱碱性过渡的氧化环境的硫酸盐型成矿溶液中形成。中国重晶石矿具有较好的找矿前景，在一些工业需求地区，有发现新矿床的可能。

Controlled by three geotectonic conditions of a continental rift system, an arc-basin system anda compressional uplift system, most of China's barite deposits developed at the early stages ofvarious geotectonic cycles, generally, bearing impact of certain of certain lithofacies- Paleogeographical andmagmatic events. The deposits may be categorized as exogenetic (sedimentary and weathered orresidual-talus) and endogenetic (volcanosedimentary, strata - bound and hydrothermal), both withbarium sources related to deep volcanic and hydrothermal activities. Barite minerals precipitated atmoderate-low temperatures in a slight-acid -to -slight -alkali environment from an ore-forming sulfate solution. Prospects for hunting of this type of resource in China are positive, particularly to some area inshortage of it which have much possibility of discovery.