CAJ | 학술논문

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(~(18)O)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(~(34)S)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.
석평천목광상위우절동남정화-대포단렬여장악-남오단렬지간적화산요함대상대륭기구,공간상화성인상균여연산만기침입적갑장화강암체관계밀절,광체수단렬구조공제.광화류형위석영맥형,위암식변주요위견운모화、황철광화,차위탄산염화.석영류체포과체Rb-Sr등시선년령위(87±1) Ma[송초시치I(Sr)=0.713 36],형성시간위만백성세.성광기류체포과체연구표명기균일온도위114.4～325.8 ℃,집중우170.2～227.0 ℃.경양동위소연구표명,성광류체적δ(D)위-52.8‰～-64.9‰,δ(~(18)O)위-3.85‰～-7.27‰,반영성광류체래자혼합적암장수여대기강수.황철광적류동위소연구표명δ(~(34)S)위+3.14‰～+4.19‰,표현위암장류특정.휘목광Re적질량분수위15.05×10~(-6)～37.65×10~(-6),여기타목광상중휘목광Re질량분수적대비결과현시,성광물질래원우하지각.이상연구표명석평천목광상속중저온암장기후열액충전석영맥형목광상.
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 carbonatiza-tion. Fluid inclusions in quartz samples present a Rb-Sr isochron age of (87±1)Ma (1σ)Ma(I_(Sr)=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 δD values of ore-forming fluids are from -52.8‰ to -64.9‰, while δ~(18)O from -3.85‰ to -7.27‰, showing that the ore-forming fluids might have been mixing by magmatic and meteoric waters. δ~(34)S of pyrites are from +3.14‰ to +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.