老王寨金矿锶-钕-铅同位素组成特征及其地质意义  

Sr-Nd-Pb Isotopic Compositions and Their Geological Implications of the Laowangzhai Gold Deposit

作　　者：邓碧平[1] 刘显凡[1] 卢秋霞[1] 

机构地区：[1]成都理工大学地球科学学院,成都610059

出　　处：《科学技术与工程》2013年第27期7947-7952,7965,共7页Science Technology and Engineering

基　　金：国家自然科学基金项目(40773031);教育部高等学校博士学科点专项项目(20105122110010;20115122110005);四川省教育厅自然科学重点项目(12ZA006);成都理工大学矿物学岩石学矿床学国家重点(培育)学科建设项目(SZD0407)资助

摘　　要：通过对老王寨金矿床岩矿石锶-钕-铅同位素组成的研究表明,锶-钕-铅同位素组成总体上相对稳定集中,具有共同的来源。岩矿石高87Sr/86Sr、低143Nd/144Nd、高206Pb/204Pb特征反映了成矿流体可能源自交代富集地幔,主要是板块俯冲海洋沉积物被带入地幔楔与地幔混合的结果。综合研究表明,老王寨金矿床成矿流体主要源于深部地幔,在参与交代蚀变过程中,其性质由熔浆向热液过渡,同时引发壳幔物质混染而有利于成矿作用的进行。The study of Sr-Nd-Pb isotopic Sr-Nd-Pb isotopic compositions are generally data for rocks and ores from the Laowangzhai gold deposit shows that stable and have the same origination; high 87Sr/86Sr ratios, low 143Nd/144Nd ratios and high 206Pb/204Pb ratios of rocks and ores may be the reflection of ore-forming fluids deriving from the metasomatic enriched mantle and are mainly the result of mantle mixing with ocean sediments which are carried into mantle wedges through plate subduetion. From what has been discussed above, the ore-forming flu- ids of the Laowangzhai gold deposit mainly derive from deep mantle, and their properties are transformed from magma fluids to hydrothermal fluids in the course of metasomatism and alteration, which leads to initiate crust-mantle mixing simultaneously to be in favor of mineralization.

关 键 词：铅同位素 锶同位素 钕同位素 深源成矿流体 老王寨金矿床 

分 类 号：P597.1[天文地球—地球化学] P597.2[天文地球—地质学]