小兴安岭高松山浅成低温热液型金矿床金的富集机制  

STUDY OF GOLD ENRICHED MECHANISM OF GAOSONGSHAN EPITHERMAL GOLD DEPOSIT IN LESSER XINGAN RANGE,NE OF CHINA

作　　者：郝百武[1,2] 张文钊[1] 葛良胜[1,2] 卿敏[1] 朱鹏[1] 赵洪海[3] 薛继广 任传涛 

机构地区：[1]中国人民武装警察部队黄金地质研究所,河北廊坊065000 [2]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [3]中国人民武装警察部队黄金第一支队,黑龙江牡丹江157021

出　　处：《矿物岩石》2014年第2期48-59,共12页Mineralogy and Petrology

基　　金：中国地质调查项目子项目;中国武警黄金专项(编号HJY2011-05)

摘　　要：近年来发现的高松山大型、低硫型浅成低温热液矿床,发育于佳木斯地块以西小兴安岭浅成低温热液成矿带。主要通过电子探针和镜下分析,矿床主要载金矿物为石英、黄铁矿和黄铜矿,其中以石英为主。石英内的金伴生有大量银和一定量铋,其主要以自然金形式存在于次生石英粒间;矿床内黄铁矿主要分布于安山质围岩内,并具有多期次性,其内存在自然金和离子金两种形式,整体早期以自然金为主,晚期黄铁矿和黄铜矿主要为离子金。黄铁矿内大量发育As,其可能为Au得以赋集的原因;沸腾作用和围岩硫化反应是高松山金矿Au沉淀的主要机制,两种机制都是在还原条件下,以H2S浓度降低为基础,使自然Au析出。矿床内大量"明金"存在于晶形较发育的次生石英颗粒间及黄铁矿(赤铁矿)内,其暗示另一期含H2S浓度较高的流体对早期矿化及围岩的清扫,使Au发生二次富集作用。矿床内发育的晚期黄铁矿和黄铜矿含有较弱金矿化,以及大量早期黄铁矿被氧化现象,其与矿床内存在的高温流体包裹体相对应,说明晚期流体性质已发生改变。在部分晚期流纹质围岩内发现较弱的金矿化,进一步说明高松山陆相火山岩型浅成低温热液金矿的矿化具有多期、多阶段性。The Gaoshongshan epithermal gold deposit occurred in Lesser Xingan Range epither- mal gold belts of western Jiamusi platform. EPMA and microscope analysis reveal that the major gold--carrying minerals include quartz,pyrites,chalcopyrites. The gold in quartz is companied by a large number of silvers and some bismuth, and it mainly occurs in state of nature gold among sub--grown quartz grains. Pyrites mainly appeared in andesitic wall rocks, with more forming phases and period, characteristic of early state of natural gold and late state ionic gold. Boiling and sulfidation reaction of country rocks are the primary precipitation mechanism of gold,and the two mechanisms occurred under reductive conditions and the eduction of gold resulted from lower con- centrations of sulfureted hydrogen. The appearance of eyeable gold developing among sub--grown quartz grains and pyrites （hematite） indicated another stage of enrichment of ore-forming fluid. The phenomena of late formed pyrites and ehalcopyrites with poor gold mineralization suggest that the Gaosongshan epithermal gold deposit developed in multiple-periods.

关 键 词：载金矿物 金的赋存状态 成矿作用 浅成低温热液型金矿 高松山 小兴安岭 

分 类 号：P618.51[天文地球—矿床学]