浙江八面山萤石矿床氢氧同位素地球化学

ISOTOPE GEOCHEMISTRY OF HYDROGEN AND OXYGEN IN BAMIANSHAN FLOURITE DEPOSIT IN ZHEJIANG PROVINCE

浙江常山八面山萤石矿床具有矿源层-岩浆岩侵入体-断裂构造＂三位一体＂的控矿模式,矿石类型以深灰色块状与条带状细粒萤石矿石为主,该类矿石外貌特征与灰岩极其相似,呈黑灰色、深灰色,比重较灰岩大;其次为紫色与翠绿色粗、巨晶块状萤石矿石,此类矿石主要产出于陡倾斜脉状矿体中。通过对不同矿石类型矿物原生包裹体水δ18O和δD分析,在δ18O-δD变异图上,多个点落在雨水区域,为成矿流体的大气降水部分提供了佐证。

The Bamianshan fluorite deposit in Changshan,Zhejiang Province,is a hydrothermal deposit controlled by strata,rock mass and interlayer fracture.There are three ore typies in it,mainly are banded fine flourite ore with dark gray or black gray colour,samiliar as limestone in exterior feature but higher density.Megacryst massive flourite ore with purple or emerald colour is the second ore type,normally occurring in steep vein orebody.Analysis of δ18O and δD for different ore typies,it shows inδ18O—δD variation chart that most of them in the area of meteoric water which proved that the meteoric water is part of the ore-forming fluid.