摘要
本文研究了乌拉山成矿微斜长石的特征及地质意义。乌拉山含金矿脉赋存于晚太古界乌拉山群高级变质岩区（变质程度以角闪岩相为主，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脉体。含金矿脉主要由中等－最大微斜长石、石英、黄铁矿和微晶自然金等矿物组成。早期中等微斜长石蚀变作用与金的富集关系密切。主要成矿期中等微斜长石的平衡温度为２６０～３６５℃，平衡压力为６．２×１０５～１．２×１０６ｋＰａ。该区金的成矿作用沿着成矿温度降低，成矿压力升高的方向发生演变。
This paper studies the characteristics and geological significance of mineralizing microcline in Wulashan gold ore field. The Wulashan gold-bearing ore veins are located in late Archean Wulashan group high grade metamorphic area (mainly at amphibolite facies, even to granulite facies),and controled by Wulashan fault structure 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. The gold rich gathering is attributed to early alteration which products the intermediate microcline. In the principal gold mineralization epoch,the mineralizing intermediate microcline occur in 260￣360℃ and 6. 2 × 105￣1. 2 × 106 kPa. With the evolutions of gold minerogenesis, the temperature is decrease and the pressure is increase.
出处
《华东地质学院学报》
1996年第1期30-35,共6页
Journal of East China Geological Institute
关键词
微斜长石
金矿床
地质意义
成矿
microcline
gold-bearing lode
gold ore field
Wulashan
