西天山阿希金矿床围岩蚀变

发布时间：2018-03-02 14:18

本文选题：围岩蚀变　切入点：质量迁移规律　出处：《地质科技情报》2017年05期 　论文类型：期刊论文

【摘要】：阿希金矿是西天山地区典型的低硫型浅成低温热液型金矿床,发育了以矿体为中心,向外依次为硅化、黄铁绢英岩化和青磐岩化的蚀变分带。对矿区火山岩和蚀变岩型矿石的主量、微量元素进行了测试,并借助Isocon法对黄铁绢英岩化、硅化和石英-碳酸盐化进行了元素质量迁移定量计算。结果表明:黄铁绢英岩化岩石富集SiO_2、K_2O、Ag、As、Mo、Bi和Pb,亏损CaO、Na_2O、Sr、Cs和Ba;硅化过程中富集SiO_2、Bi、Pb、Ag和As,而MgO、CaO、Na_2O、Ba和U出现亏损;石英-碳酸盐化过程中元素迁移量较大,主要富集SiO_2、MgO、CaO、Li、Ba和As,亏损K_2O、Na_2O、P_2O_5、Pb和Zn等元素。结合蚀变岩石显微特征,认为热液蚀变过程中的元素迁移与矿物的蚀变或生成直接相关,而且含Au络合物在Au成矿中扮演重要角色。
[Abstract]:The Achi gold deposit is a typical low-sulfur epithermal hydrothermal gold deposit in the West Tianshan area. The main quantity and trace elements of volcanic rock and altered rock type ore in the mining area were measured, and the Isocon method was used for the determination of the main quantity and trace elements of the volcanic rock and altered rock type ore. The quantitative calculation of the mass migration of elements in silicification and quartz-carbonation has been carried out. The results show that SiO2K _ 2O-C _ (2) O _ (2) O _ (2) C _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2). In the process of quartz-carbonation, the element migration is large, mainly enriched in Sio _ 2MgO _ (2) Cao _ (Li) Ba and As, and depleted in K _ 2O _ (2) Na _ (2) O _ (2) O ~ (2 +) P _ 2O _ (5) Pb and Zn, etc. Combined with the microscopic characteristics of altered rocks, it is considered that the element migration during hydrothermal alteration is directly related to the alteration or formation of minerals. Moreover, au-containing complexes play an important role in au mineralization.
【作者单位】：中南大学地球科学与信息物理学院;中南大学有色金属成矿预测与地质环境监测教育部重点实验室;中信大锰矿业有限公司大新锰矿分公司;
【基金】：国家自然科学基金项目(41472301) 中南大学“创新驱动计划”项目(2015CX008) 新疆自治区高层次人才工程
【分类号】：P618.51

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