鄂西南地区方解石、重晶石矿成矿地质特征及成因浅析

Metallogenic Geological Characteristics and Genesis of Calcite and Barite Deposits in Southwestern Hubei

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。

Combining the previous literatures and field geological practice, The anthors sum up the calcite, barite ore mineralization 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.