投稿时间：2012-04-02
修订日期：2012-11-14
中文摘要:虎头崖铜铅锌多金属矿床位于东昆仑西段祁漫塔格成矿亚带内。矿化带产于岩体与围岩接触蚀变带、不同岩性地层接触界面或地层中断裂破碎带内,兼有正接触带和外接触带2种蚀变矿化带。由岩体→接触带→碳酸盐岩地层,金属成矿元素分别为W-Mo→Fe-Sn-Cu→Cu-(Pb-Zn)→Pb-Zn-Ag,蚀变类型由岩体自变质的钾化、硅化、云英岩化过渡为正接触带附近的符山石化、绿帘石化、透辉石化,再到外接触带围岩的石榴子石化、透辉石化,以及晚期的绿泥石化、碳酸盐化。主量元素分析结果显示,地层中的CaO等向岩浆岩内扩散,岩体中的SiO2、Al2O3等则向碳酸盐岩扩散,而且,与花岗岩相比,矽卡岩中FeO、MnO、MgO更为富集,这表明接触渗滤作用与接触交代作用同时存在。成矿元素分析结果显示,W、Mo元素在岩体内含量较高,而Fe、Cu、Pb、Zn主要在矽卡岩带内富集,各成矿元素在未蚀变大理岩中的含量均较低。笔者认为,矿化蚀变的明显分带性是岩体和地层成矿差异性及矽卡岩带内微裂隙系统发育的不均匀性所致。
Abstract:The Hutouya copper-lead-zinc polymetallic deposit is located in the Qimantag metallogenic subzone, which belongs to the west segment of East Kunlun. The mineralized zone lies in the contact alteration zone between the intrusive rock and the strata, the contact zone between two strata and the shatter zone within the strata. The deposit possesses inner and outer contact zones, from the intrusion to the strata, the dominant mineralization elements vary in order of W-Mo→Fe-Sn-Cu→Cu-(Pb-Zn)→Pb-Zn-Ag, and types of alteration also change from K-feldspathization, silicification, greisenization to epidotization and diopsidization. There also exist diopsidization, chloritization and carbonatization of the late stage. The analysis of major elements shows that CaO diffused from the strata to the silicate intrusion while SiO2 and Al2O3 also diffused to the carbonate rock. And the enrichment of FeO, MnO and MgO shows that there existed both diffusive metasomatism and infiltration metasomatism. An analysis of ore-forming elements also suggests that W and Mo mainly exist in the intrusion and Fe, Cu, Pb, Zn are concentrated in the skarn. It is inferred that zonation of mineralization and alteration was produced by difference in ore-bearing potential and degree of the development of the microcrack system in the skarn.
keywords:geology alteration and mineralization zoning skarn polymetallic deposit infiltration metasomatism Hutouya Qimantag area Qinghai Province
文章编号：
中图分类号：P618.41;P618.42;P618.43
文献标志码：
基金项目:本文得到中国地质调查局地质调查项目(编号: 1212011085528、1212011121089);国家自然科学基金项目(批准号: 41172076)和中国地质调查局青年地质英才计划(201112)的联合资助
引用文本：
马圣钞,丰成友,张道俊,李大新,舒晓峰,刘建楠,杜松金.2013.青海虎头崖矽卡岩型多金属矿床蚀变矿化分带特征研究[J].矿床地质,32(1):109~121MA ShengChao,FENG ChengYou,ZHANG DaoJun,LI DaXin,SHU XiaoFeng,LIU JianNan,DU SongJin.2013.Alteration and mineralization zoning of Hutouya polymetallic deposit in Qimantag area, Qinghai Province[J].Mineral Deposits32(1):109~121
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