西藏首例云英岩型钨矿——甲岗雪山W-Mo多金属矿床地质特征研究

发布时间：2018-02-24 22:23

本文关键词： 云英岩型钨矿床流体包裹体甲岗雪山西藏　出处：《岩石矿物学杂志》2017年02期 　论文类型：期刊论文

【摘要】：甲岗雪山W-Mo多金属矿床位于西藏自治区申扎县境内,地处冈底斯北部,成矿时代为中新世。矿床与矿区内的二长花岗岩体时空关系紧密,矿区内的围岩蚀变普遍见云英岩化,并且云英岩化强烈的地方多伴随强烈的钨钼矿化;矿体的类型以云英岩型为主,还有少量石英脉型,矿石又多呈细脉状或浸染状赋存于云英岩或云英岩化二长花岗岩体内部,证实了矿床的成因类型为云英岩型。依据野外见到的矿物共生组合、脉体穿切关系等,可将成矿期划分为硅酸盐-氧化物阶段和硫化物阶段。流体包裹体研究表明,甲岗雪山W-Mo多金属矿床主成矿期的成矿流体为中-高温、中-低盐度的流体,从主成矿期的硅酸盐-氧化物阶段演化到硫化物阶段,成矿流体的温度下降明显,盐度也有所下降。
[Abstract]:The jaggang Xueshan W-Mo polymetallic deposit is located in the territory of Xainza County, Tibet autonomous region, located in the northern Gangdese metallogenic epoch, Miocene. Two granite deposits and the relationship between time and space within the mining area closely, altered rocks within the mining area of common paleokarstification, and strong local GREISENIZED accompanied by strong mineralization of tungsten and molybdenum the ore type; with greisen type, there is a small amount of quartz vein type ore, and mostly veinlet disseminated or occur in Kira rock or GREISENIZED granite body two, confirmed that the genetic type of deposit is greisen. According to field see mineral assemblages, veins crosscutting relationship so, can be divided into silicate oxide mineralization stage and sulfide stage. Research on fluid inclusions show that ore-forming fluids jaggang Xueshan W-Mo polymetallic deposit, the main mineralization period in high temperature, low salinity fluid, from the main The silicate oxide phase of the ore period evolved into the sulfide phase, and the temperature of the ore-forming fluid declined obviously, and the salinity also decreased.

【作者单位】：中国地质大学地球科学与资源学院;中国地质科学院地质研究所;北京大学地球与空间科学学院;中国地质科学院矿产资源研究所;
【基金】：国家重点研发计划项目(2016YFC0600300) 国家重点基础研究发展计划“973”项目(2015CB452600,2011CB4031006) 国家自然科学基金项目(41472076,41102033) 中国地质调查局地质调查项目(DD20160024-02,03,07,DD20160026) 基本科研业务费专项项目(53200859424)~~
【分类号】：P618.67;P618.2

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