甘肃寒山金矿区黄钾铁矾的形成机制及其地质意义  

GENESIS OF JAROSITE IN THE HANSHAN GOLD MINE OF GANSU PROVINCE AND ITS GEOLOGICAL SIGNIFICANCE

作　　者：张招崇[1] 毛景文[2] 杨建民[2] 王志良[2] 张作衡[2] 左国朝 吴茂炳 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]中国地质科学院矿床地质研究所,北京100037 [3]甘肃省地质矿产局地质科学研究所,兰州730000

出　　处：《地质地球化学》1999年第1期33-37,共5页Geology-Geochemistry

基　　金：国家计委科技找矿项目!"北祁连山西段镜铁山式铁铜矿床成矿预测和靶区优选"

摘　　要：在分析寒山金矿区原生矿物和氧化矿物组合的基础上，通过对黄钾铁钒的热力学计算分析得出：在常温条件下，黄铁矿要形成黄钾铁钒，所需的氧逸度较低，但需要有一个较高的碱性、富钾、富Fe2＋以及富水的环境，这一条件暗示了围岩为富铁的基性火山岩在湿润的气候条件下有利于形成黄钾铁钒，同时也表明寒山金矿区氧化带的形成过程中，其气侯环境不是现在的沙漠干旱气候，而是湿润动植物繁盛的大陆性气候。结合区域地质特征，可以得出寒山金矿的氧化带可能形成于早侏罗世-中侏罗世。Based on the primary. and secondary mineral associations in the Hanshan gold deposit, the thermo-dynamic analysis of jarosite shows that at normal temperature, pyrite can be oxidized into jarosite un-der low oxygen fugacity in such an environment as being high in alkali, rich in K and Fe and sufficientin water. This suggests that the Fe-rich basic rocks as ore-hosted rocks be favorable to the formation ofjarosite under humid climate. During the process of formation of the oxidized zone in the Hanshan goIdmine, the climate was not a desert dry climate as what it is now, but a humid continental climate un-der which animals and plants were flourishing. In combination with the regional geological characteris-tics, it can be inferred that the oxidized zone of the Hanshan gold deposit might have been formed inthe Early to Middle Jurassic.

关 键 词：黄钾铁钒 形成机制 地质意义 金矿床 金矿区 

分 类 号：P578[天文地球—矿物学] P618.510.4[天文地球—地质学]