赣南西华山钨矿床硫、铅同位素组成对成矿物质来源的示踪  

Sulfur and Lead Isotope Composition on Tracing Ore-forming materials of the Xihuashan Tungsten Deposit in Southern Jiangxi

作　　者：许泰[1] 王勇[2] 

机构地区：[1]陇东学院能源工程学院,甘肃庆阳745000 [2]东华理工大学,江西抚州344000

出　　处：《矿物岩石地球化学通报》2014年第3期342-347,共6页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：全国危机矿山接替资源找矿项目(20089947)

摘　　要：为明确西华山钨矿床成矿物质的来源,本文以矿床中的硫化物和钾长石为研究对象,通过硫化物中硫、铅同位素的研究,对矿床成矿物质来源进行探讨.结果表明,矿石中黄铁矿δ^34S值为-2.1‰～0.4‰,辉钼矿δ^34S值为4‰～7.9‰,硫主要来源于岩浆.辉钼矿、黄铁矿、钾长石的^206 pb/^204 Pb值分别为18.718～18.849、18.640～18.745、18.698～18.792;207 pb/204 Pb值分别为15.762～15.770、15.704～15.747、15.697～15.724;^208 pb/^204 Pb值分别为39.094～39.134、38.902～39.056、38.904～39.012.由此判断矿床中矿石铅与岩石铅同位素组成具有同源关系,矿石铅主要来自与岩浆作用有关的上地壳;成矿物质来源于上地壳重熔形成的花岗岩浆,即上地壳岩浆侵位,为成矿作用提供部分成矿物质,同时也暗示成矿物质是由体现壳源特征的西华山复式岩体提供.To clear the source of ore-forming material of the Xihuashan tungsten deposit,this paper chose metal sulfide and potash feldspar in the deposit as the research object,discussed the sources of ore forming materials of deposit.The results showed that pyrite δ^34 S=-2.1‰～0.4‰,molybdenite δ^34 S=4‰～7.9‰,sulfur was mainly derived from magma,and that ratios of ^206 Pb/^204 Pb,^207Pb/^204 Pb and 208Pb/204 Pb for molybdenite,pyrite,potash feldspar are 18.718～18.849,18.640～18.745 and 18.698～18.792,15.762～15.770,15.704～15.747 and 15.697～15.724,39.094～39.134,38.902～39.056 and 38.904～39.012,respectively.We concluded that lead isotopes in the ore and the rock have a homologous relationship,mainly from magmatism in the upper crust.The results of sulfur and lead isotope indicated that remelting granite magma was the sources of ore forming materials,in other words,the upper crust magma emplacement provided some ore forming materials for mineralization.It suggests that the Xihuashan composite body provides ore forming materials.

关 键 词：硫同位素 铅同位素 成矿物质来源 西华山钨矿床 

分 类 号：P618.65[天文地球—矿床学] P597[天文地球—地质学]