江西荡坪钨矿床地质特征与找矿标志

Geological characteristics and prospecting sign of Dangping tungsten deposit in Jiangxi

荡坪矿区大地区域构造位置处于南岭东西构造带东段,位于西华山岩体的北缘,系西华山花岗岩株内的钨矿区之一。矿体产于隐伏花岗岩的内接触带的石英脉中,赋矿围岩为斑状中细粒黑云母花岗岩。矿体围岩蚀变发育,以云英岩化和钾长石化(有时为钾长石-钠长石化)与成矿关系最为密切,各种蚀变类型在空间上,显示出具有水平分带与垂直分带的特点。通过对矿床地质特征进行综合分析,在前人的研究基础上,推断其为岩浆期后高温热液裂隙充填型矿床,本文总结了该矿床地层岩性、构造和矿化蚀变找矿标志,为寻找赣南同类型黑钨矿床提供重要的参考。

Dangping mining area is located in the eastern part of the Nanling Mountain east-west structural belt and the northern edge of the Xihuashan rock mass.It is one of the tungsten mining areas in the Xihuashan granite stock.The ore body occurs in quartz veins in the inner contact zone of the concealed granite,and the host rock is medium to fine grained porphyritic biotite granite.The wall rock alteration of the ore body is well developed,and greisenization and potassium feldsparization(sometimes potassium feldspar albitization)are closely related to the mineralization.In space,various types of alteration show the characteristics of horizontal and vertical zonation.Based on the comprehensive analysis of geological characteristics of the deposit and previous research,it is inferred that the doposit is a post magmatic high-temperature hydrothermal fissure filling type deposit.This paper summarizes the stratigraphic lithology,structure,mineralization alteration and prospecting indicators of the deposit.It provides an important reference for exploration for the same type of wolframite deposit in South Jiangxi.