投稿时间：2012-05-19
修订日期：2012-12-30
中文摘要:虎头崖铜铅锌多金属矿床的成矿作用十分复杂,成矿-控矿因素仍不明,已成为制约找矿突破的瓶颈。鉴于此,笔者对该矿床的地质、地球化学特征和侵入岩年龄及地球化学开展了研究。结果表明,Ⅵ矿带二长花岗岩LA-MC-ICP-MS锆石U-Pb同位素年龄为(217.5±1.1) Ma(MSWD=1.4)。Ⅵ矿带和Ⅱ矿带二长花岗岩钾、钠含量均较高,w(K2O)大于w(Na2O),分异程度较高,稀土元素球粒陨石标准化曲线向右缓倾斜,强烈富集LILE,中等富集HFSE,贫Ti、Ba,具有后碰撞阶段岩石的特点。成矿受侵入岩岩浆源区、演化方式,地层,构造,以及岩体与围岩接触方式的综合控制。源区具有地幔物质贡献的Ⅵ矿带二长花岗岩,成矿作用较强,主要形成近接触带矽卡岩型和远接触带矽卡岩型Cu-Pb-Zn多金属矿。而壳源特征为主的Ⅱ矿带二长花岗岩成矿能力较弱,主要形成矽卡岩型Sn、Mo、Fe等矿产。
Abstract:Mineralization of the Hutouya deposit is very complicated, and the unclear mineralization and ore-controlling factors constitute the bottleneck which restricts the breakthrough of the ore-prospecting work. Detailed studies of characteristics of the ore deposit and geochemistry, geochronology and geochemistry of intrusive rocks were conducted by the authors with some achievements obtained. Zircon LA-MC-ICP-MS U-Pb isotopic age of monzogranite in No. Ⅵ ore belt is (217.5±1.1) Ma (MSWD=1.4). Monzogranite of Ⅵ mineral belt and Ⅱ mineral belt have such features of post-collision rocks as high content of K2O and Na2O, higher K2O than Na2O, higher differentiation, gently right-oblique shape in chondrite-normalized REE patterns, enrichment of LILE, moderate enrichment of HFSE and depletion of Ti and Ba. Mineralization is controlled by such factors as magma sources of intrusive rocks, evolution mode of intrusive rocks, strata, and structure. The monzogranite intrusions of Ⅵ mineral belt whose material was partly contributed by the mantle had features of strong fractional crystallization and relatively strong ore-forming capability. They mainly formed skarn-type Cu-Pb-Zn polymetallic deposits. Ⅱ mineral belt Monzogranite which originated only from crustal sources had inferior mineralization capacity and they were mainly related to mineralization of such skarn-type ore bodies as tin, molybdenum and iron.
keywords:geochemistry U-Pb isotopic age mineralization and ore-controlling factors skarn-type deposit Hutouya Qimantag 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"青海省格尔木市野马泉地区铁多金属矿整装勘查区找矿部署研究"(青地调勘[2012]62号)和中国地质调查局地质调查项目(1212011085528)的联合资助
引用文本：
张爱奎,刘光莲,丰成友,莫宣学,杨六成,刘永乐,何书跃,马永寿.2013.青海虎头崖多金属矿床地球化学特征及成矿-控矿因素研究[J].矿床地质,32(1):94~108ZHANG AiKui,LIU GuangLian,FENG ChengYou,MO XuanXue,YANG LiuCheng,LIU YongLe,HE ShuYue,MA YongShou.2013.Geochemical characteristics and ore-controlling factors of Hutouya polymetallic deposit, Qinghai Province[J].Mineral Deposits32(1):94~108
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