浙东南石平川钼矿床地质特征、成矿时代及成因  

Geology,Mineralization Age and Genesis of the Shipingchuan Molybdenum Deposit,Southeastern Zhejiang Province

作　　者：肖广玲[1] 孙晓雁 王启 刘国春 于海涛 李艳军[1] 潘锦勃 

机构地区：[1]中国地质大学资源学院(武汉),武汉430074 [2]灵宝黄金股份有限公司,河南灵宝472532 [3]内蒙古自治区赤峰地质矿产勘查开发院,内蒙古赤峰024005 [4]浙江省地质勘查局第十一地质大队,浙江温州325006

出　　处：《地质科技情报》2010年第1期74-79,85,共7页Geological Science and Technology Information

基　　金：教育部创新团队发展计划(IRT0755);全国危机矿山接替资源找矿项目(2006020035)

摘　　要：石平川钼矿床位于浙东南政和—大埔断裂与长乐—南澳断裂之间的火山坳陷带相对隆起区,空间上和成因上均与燕山晚期侵入的钾长花岗岩体关系密切,矿体受断裂构造控制。矿化类型为石英脉型,围岩蚀变主要为绢云母化、黄铁矿化,次为碳酸盐化。石英流体包裹体Rb-Sr等时线年龄为(87±1)Ma[锶初始值I(Sr)=0.713 36],形成时间为晚白垩世。成矿期流体包裹体研究表明其均一温度为114.4~325.8℃,集中于170.2~227.0℃。氢氧同位素研究表明,成矿流体的δ(D)为-52.8‰^-64.9‰,δ(18O)为-3.85‰^-7.27‰,反映成矿流体来自混合的岩浆水与大气降水。黄铁矿的硫同位素研究表明δ(34S)为+3.14‰^+4.19‰,表现为岩浆硫特征。辉钼矿Re的质量分数为15.05×10-6~37.65×10-6,与其他钼矿床中辉钼矿Re质量分数的对比结果显示,成矿物质来源于下地壳。以上研究表明石平川钼矿床属中低温岩浆期后热液充填石英脉型钼矿床。The Shipingchuan molybdenum（Mo） deposit is located in relative uplift area in depression belt between Zhenghe-Dapu and Changle-Nan＇ao deep faults in southeastern Zhejiang Province. Controlled by fractures, it is closely related to feldspar granite body in space and origin. The mineralization involves quartz veins, the issericitization and pyritization of the wall rock alteration with subordinate carbonatization. Fluid inclusions in quartz samples present a Rb-Sr isochron age of （87±1） Ma （1σ）Ma （Isr = 0. 713 36） ,indicating it was formed in late Cretaceous. Microthermometric studies indicate that the homogenization temperatures of fluid inclusions in ore-forming stage range from 114.4 to 325.8℃, with most values in the range of 170.2--227 ℃. Hydrogen and oxygen isotopic compositions of typical ores indicate that 8D values of ore-forming fluids are from -52. 8‰ to -64. 9‰, while 8180 from -3.85‰ to -7.27‰, showing that the ore-forming fluids might have been mixing by magmatic and meteoric waters. 334S of pyrites are from 3-3.14‰ to 3-4.19‰, similar to magmatic sulfur. Re contents in molybdenites are 15.05× 10^-6 to 37.65 × 10^-6 ,showing metallogenic material derived from the lower crust by analogy with other Mo deposits. Hence, it can be concluded that the Shipingchuan Mo deposit is a postmagmatic hydrothermal （medium to low temperature） filling with quartz vein molybdenum deposit.

关 键 词：石英脉型钼矿床 地质特征 成矿时代 石平川钼矿床 浙江 

分 类 号：P618.65[天文地球—矿床学]