江西宝山花岗岩体的特征初探

On the Features of Granite Body in Baoshan, Jiangxi

宝山花岗岩体属燕山早期第三阶段第三次岩浆侵入的产物,为同源二期、三次侵入的浅成浅剥蚀的复式黑云母二长花岗岩小岩株,由中粗粒花岗岩、细粒斑状花岗岩、细粒花岗岩组成。花岗岩体富含W、Pb、Zn、Cu等成矿物质,由早到晚的侵入演化,成矿元素趋于矿化富集,其侵位高度和剥蚀程度有利于宝山矽卡岩型矿床的形成和保存,是矿床的成矿母岩。

This paper studies the features of Baoshan granite body in Chongyi county of southern Jiangxi Province, with emphases on its petrology, petro-chemistry and ore-element concentrations. The granite emplaced in a limited depth is of shallow erosion. Based on mineralogy classification, it is attributed as biotite monzo-granite and can be divided into two stages and three times of emplacement. Chemically it is a silica saturated and AI- rich talc-alkali rock facies in the rock. The concentrations of major ore elements, i.e. W, Ag, Pb, Zn and Cu are higher, especially in the later stage fine-grain granite, indicating that the granite is an important condition and possible source for the Baoshan skarn type deposit. The alteration and fluid inclusion of the Baoshan granite is also studied.