乌拉山岩金矿田微斜长石成因成矿信息研究及其意义

乌拉山含金矿脉赋存于新太古代乌拉山群高级变质岩区（变质程度以角闪岩为主，可达麻粒岩相），受控于乌拉山断裂构造带。区内出露了大桦背花岗岩体以及大量不同成因的长英质体，含金矿脉主要由中等一最大微斜长石，石英，黄铁矿和微晶自然金等矿物组成。对矿脉微斜长石有关信息作了Ｉ值信息量，对应－聚类及成因判别的分析，研究表明成矿作用可分为两个阶段，矿脉系岩浆热液成因。矿脉微斜长石钾长石组分的摩尔分数，有序度（Ｚ）和

STUDIES ON INFORMATION OF MINERALIZING MICROCLINE AND THEIR SIGNIFICANCE IN WULASHAN GOLD ORE FIELD

The Wulashan gold-bearing ore veins are located in Wulashan Group of Neoarchean, high grade metamorphic area (mainly of amphibolite facies, even to granulite facies), and controled by Wulashan fault zone. Dahuabei granite mass and a lot of quartzofeldspathic veins with several genetic types exist in this area. The gold-bearing ore veins consist of microcline from intermediate to maximum, quartz, pyrite and microcrystalline natural gold. Detailed study is made for the useful information of mineralizing microcline using I -informational value, correspondence-polymer and genetic type discriminant analysis. The reasearch shows that two ore-forming events have occurred and there may exist post-magmatic hydrothermal fluid. It is closely related to the alkali end member composition, Al-Si ordered degree and formation free-energy. The Al-Si ordered degree of microcline is the mineralogical indicator for gold-bearing potential estimate.