本文選題：Rb-Sr定年　切入點(diǎn)：S-Pb同位素　出處：《地質(zhì)通報(bào)》2017年05期 　論文類型：期刊論文

【摘要】：對貴州銅仁塘邊鉛鋅礦床開展閃鋅礦Rb-Sr測年和黃鐵礦、方鉛礦、閃鋅礦S、Pb同位素分析,以獲得礦區(qū)的成礦年齡,探討其成礦物質(zhì)來源。塘邊鉛鋅礦床閃鋅礦Rb-Sr等時(shí)線年齡為477±5Ma(MSWD=1.2),與前人獲得的卜口場礦區(qū)閃鋅礦Rb-Sr等時(shí)線年齡486±6Ma在誤差范圍內(nèi)一致,表明礦床形成于加里東早期。黃鐵礦、方鉛礦、閃鋅礦S同位素變化于+25.2‰~+36.1‰之間,與湘西—黔東主要鉛鋅礦床相似,明顯富集重硫,認(rèn)為S可能來源于寒武系海水碳酸鹽和/或下伏地層。方鉛礦、閃鋅礦Pb同位素~(208)Pb/~(204)Pb值為38.389~38.584,~(207)Pb/~(204)Pb值為15.737~15.790,206Pb/~(204)Pb值為18.181~18.217,μ值為9.75~9.86,顯示鉛主要來源于上地殼。
[Abstract]:Rb-Sr dating of sphalerite and isotopic analysis of pyrite galena sphalerite and sphalerite in Tongren Tangbian lead-zinc deposit Guizhou Province were carried out in order to obtain the metallogenic age of the deposit. The Rb-Sr isochron age of sphalerite in Tangbian lead-zinc deposit is 477 鹵5 Ma, which is consistent with the Rb-Sr isochron age of sphalerite obtained by predecessors at 486 鹵6 Ma, indicating that the deposit was formed in early Caledonian pyrite. The S isotopic variation of galena and sphalerite ranges from 25.2 鈥，

本文編號：1584116