摘要
文章在矿床地质、地球化学及同位素年代学研究的基础上,总结了菲莫铜钼多金属矿床的成因及理想模式。矿床中岩、矿石S、Pb同位素组成显示,矿床成矿物质主要来源于深部地幔或下地壳古老基底,后混入部分上地壳物质;H、O同位素特征显示,矿床成矿热液以上升的岩浆热液为主,结合部分变质热液及渗透淋滤的大气降水形成混合热液;Re-Os同位素测年得出矿床形成时间为(47·81±0·71)Ma,矿化主要发生于大皮甲岩体岩浆侵位晚期的期后热液阶段。矿床成因类型属沉积-变质-岩浆热液叠加改造型铜钼多金属矿床。成矿作用具长期性、多期次、多来源、多阶段、多成因的特征,大致经历了古元古代的沉积定位阶段→中新元古代的区域变质改造富集阶段→喜马拉雅期的颠覆性改造叠加富集成矿阶段。
In this paper, the authors summarized the metallogenic model of the Feimo Cu-Mo polymetalic deposit on the basis of geological, geochemical and isotopic geochronological characteristics of the ore deposit. The S, Pb isotopes of rocks and ores show that the metallogenic material was derived from deep mantle source, with the ad- dition of a certain amount of crust-derived material at the late stage. H, O isotope characteristics show that the ore-forming hydrothermal fluid originated from ascending magmatic hydrothermal solution in combination with mixed hydrothermal solutions dominated by permeable meteoric water. Statistic Re-Os isotope dating of the de- posit yielded （47.81± 0.71） Ma. The main mineralization occurred in the post-magmatic hydrothermal stage of late Dapijia rock mass magrnatic emplacement. The ore deposit genetically belongs to the sedimentation-meta- morphism-magmatic hydrothermal solution superimposed deformation type Cu-Mo polymetallic deposit. The mineralization of the deposit was characterized by long period, multi-phase, poly-source, poly-stage and multi- genesis, and the ore-forming process experienced the sedimentary locating stage of Proterozoic, regional meta- morphism-reformation-enrichment stage of middle-late Proterozoic, and subversive reformation superposition en- richment stage of Himalayan period.
出处
《矿床地质》
CAS
CSCD
北大核心
2013年第3期603-613,共11页
Mineral Deposits
关键词
地球化学
变基性火山岩
热液改造
成矿模式
菲莫铜钼多金属矿床
云南
geochemistry, meta-basic volcanic rocks, hydrothermal reformation, metallogenic model, FeimoCu-Mo polymetalic deposit, Yunnan Province
