鄂西南地区方解石、重晶石矿成矿地质特征及成因浅析

摘要

Combining the previous literatures and field geological practice,The anthors sum up the calcite,barite ore min-eralization geological features and metallogenic formation in the study area, through the analysis of regional geological background and geophysical characteristics. It shows that the ore-bearing strata of calcite,barite ore( bed) within the study area is mainly in the Cambrian and Ordovician carbonate formation in which the limestone and dolomite is the main en-richment layer with Ba and Ga. And the Ba is generally higher than the average content of the earth crust,thus it can pro-vide the source material for barite and calcite mineral. Owing to the ore-forming temperature at about 109~222 ℃,the genesis of ore belongs to the low temperature mineralization. Calcite,barite ore are related to the magmatism and tectonic movement:the magmatism provides thermodynamic conditions,while the tectonic movements of multiple times provides a mineral transfer,mineral deposition ore-forming system for mineralization.%将前人文献资料与野外地质实际相结合,通过分析区域地质背景、 地球物理特征,归纳研究区方解石—重晶石矿成矿地质特征,探讨研究区的成矿成因,认为研究区方解石、 重晶石矿(床)赋矿地层主要为寒武系、 奥陶系碳酸盐地层.该地层中灰岩和白云岩是Ba和Ca的主要富集层,其中Ba含量普遍高于地壳平均含量,为重晶石、 方解石矿提供物质来源,成矿温度109~222℃,属低温成矿;本区方解石、 重晶石矿与岩浆活动、 构造运动有关,岩浆活动为成矿提供了热动力条件,多期次的构造运动为成矿提供了导矿—储矿成矿系统.