西天山阿希金矿床围岩蚀变  

Hydrothermal Alteration in the Axi Gold Deposit,Western Tianshan

作　　者：刘占坤[1,2] 毛先成 潘敏[1,2] 和平贤[3] 

机构地区：[1]中南大学地球科学与信息物理学院,南宁532315 [2]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,长沙410083 [3]中信大锰矿业有限公司大新锰矿分公司,南宁532315

出　　处：《地质科技情报》2017年第5期195-203,共9页Geological Science and Technology Information

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

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。The Axi low-sulfidation epithermal gold deposit, located in the western Tianshan, develops a clear alteration holo, which shows changing outward from quartz veins of the main orebodies, through a zone of silicification to a phyllic alteration zone, followed by the propylitization. This paper systematically analyzes the major elements and trace elements of the volcanic rock and altered rock of the Axi gold deposit. On this basis, the element mobility in pyritic-phyllic alteration, silicification and quartz-carbonatization is calculated quantitatively by using the isocon method. The results show that the pyritic-phyllic alteration is enriched inSiO2,K2O,Ag,As,Mo,Bi and Pb, and depleted in CaO,Na2O,Sr,Cs and Ba. During the processes of silicification, SiO2 ,Bi,Pb,Ag and As are added, meanwhile MgO,CaO,NaEO,Ba and U are obviously brought out. During quartz-carbonatization, the tremendous migration of clemens was observed, showing that the altered rock increased SiO2 ,MgO,CaO,Li,Ba and As, countrary with K2O,Na2O,P2O5, Pb and Zn. Combining with the microcharacetistics of altered rock, the element migration in hydrothermal alteration is directly associated with the mineral changes, and the gold complex compounds play a significant role in mineralization.

关 键 词：围岩蚀变 质量迁移规律 成矿机制 阿希金矿 西天山 

分 类 号：P595[天文地球—地球化学] P614[天文地球—地质学]