西岔、金厂沟金矿床地质特征及成矿机理

The geological charactor and metallogenic mechanism of the xicha ginchang gougold deposit

西岔、金厂沟金矿床属于层控破碎带蚀变岩型金矿 ,其成矿时代为印支至燕山早期。地层岩石中元素含量及其演化资料表明 ,矿床成矿物质来源具双重性 ,即有来源于地层 ,也可能有部分来自岩浆岩。稳定同位素研究结果为 :西岔金矿床 δ3 4S=1.9‰～ 7.4‰ ,金厂沟金矿床 δ3 4S=3.2‰～ 5.1‰ ,二矿床硫同位素组成基本相近 ,表明硫源相似 ;δ18OH2 O=5.3‰～ 6 .4‰ ;δ13 C=- 6 .1‰。流体包裹体研究表明 ,成矿流体主要为氯化物水型。成矿温度集中于 142～ 2 90℃。由此推断矿液水可能是岩浆水与大气水的混合水。矿液中的碳可能来源于地层。

Xicha,Ginchang Gou Gold ore deposit are belong to strata bound break alteration tapy,Its metallogenic times are in the early Yanshanian to Indo chinese epoch,The information about the element abundance and its evolution in stratiform indicate that the metallogenic source materiab of the deposit have double features.some of them came from strtiform and perhaps parts from magmatic rocks.Stable isotopic data as follow:Xicha gold are deposit:δ 34 S=1 9‰～7 4‰;Jin Chang Gou:δ 34 S=3 2‰～5 1‰ It indicate this two ore deposit with similar sulphur isotopic component have the similar sulphur source.δ 18 O H 2O =5 3‰～66 4‰;δ 13 C=-6 1‰ Fluid inclusions datas indicate that metallogenic fluid are mainly chlorinated water.metallogenic tempeture concentrate on the 142~290℃ From this,we infer the ore bearing solutions probale the mixture water of magmatic water and atmospheric precipitution.The ore bearingsolutions possible came from the stratiform.