蒙山南部浒溪硅灰石矿床地质特征及控矿因素

Geological characteristics and ore-controlling factors of Huxi wollastonite deposit in southern Mengshan

浒溪硅灰石矿床位于江西蒙山南部,紧邻石竹山硅灰石矿南东角。本文以浒溪矿区野外钻探成果为第一手资料,以周边矿区资料为辅,总结了浒溪硅灰石矿床地质特征,分析了浒溪硅灰石矿控矿因素。研究表明:浒溪矿区硅灰石矿主要为接触热变质型矿床,硅灰石成矿物质来源为中二叠统茅口组含燧石结核灰岩;硅灰石成矿热量来源为印支期的蒙山岩体;区域的滑覆构造体系形成的各种次级裂隙能使CO2逸出,有利于成矿;蒙山南部第四系覆盖区域深部仍具有较大的隐伏硅灰石矿找矿前景。

Huxi wollastonite deposit is located in the south of Mengshan,Jiangxi province,adjacent to the southeast corner of Shizhushan wollastonite deposit.Based on the results of field drilling in Huxi mining area,supplemented by the data of surrounding mining areas,this paper summarizes the geological characteristics of Huxi wollastonite deposit and analyzes the ore control factors of Huxi wollastonite deposit.The results show that the wollastic deposit in Huxi mining area is mainly of contact thermal metamorphic type,and the ore forming material of wollastonite is derived from chert nozzle-bearing limestone of Maokou formation in middle Permian.The oreforming heat of wollastonite comes from the Mengshan rock mass during the Indosinian movement.The secondary fissures formed by the gliding nappe tectonic system in the region can make CO2 escape,which is beneficial to mineralization.In the deep part of the quaternary overburden area in the south of Mengshan,there is still a great prospect of hidden wollastonite prospecting.