【摘要】：湖北銀洞溝銀金礦床是南秦嶺重要的大型銀礦床,礦體產(chǎn)于武當群變質(zhì)火山巖中,受剪切構(gòu)造控制,礦石類型主要為石英脈型。礦相學(xué)研究表明,含銀礦物與方鉛礦常同脈產(chǎn)出,從早到晚產(chǎn)出的含銀礦物分別為銀金礦、自然銀、輝銀礦、輝銅銀礦,有從銀礦化向銅礦化轉(zhuǎn)變的趨勢,反映了成礦流體從早到晚由氧化變?yōu)檫�原。測得與銀金礦密切共生的白云母氬-氬坪年齡為231.0±2.0 Ma(MSWD=0.96),反等時線年齡為229.5±1.4 Ma(MSWD=0.73),與前人測得的本區(qū)剪切帶多硅白云母氬-氬年齡一致,表明成礦作用與區(qū)域剪切構(gòu)造變形有關(guān)。
[Abstract]:Yindonggou silver gold deposit in Hubei Province is an important large silver deposit in the South Qinling Mountains. The orebody occurs in the volcanic rocks of Wudang Group and is controlled by shear structure. The ore type is mainly quartz vein type. The metallographic study shows that the silver-bearing minerals are often produced in the same vein as galena, and the silver-bearing minerals produced from morning to evening are silver gold deposits, natural silver, pyroxene and copper-silver deposits, which tend to change from silver mineralization to copper mineralization. It reflects that the ore-forming fluid changes from oxidation to reduction from morning to night. The argon-argon plateau age of Muscovite closely associated with silver gold deposit is 231.0 鹵2.0 Ma (MSWD=0.96), and the inverse isochron age is 229.5 鹵1.4 Ma (MSWD=0.73), which is consistent with the argon-argon age of polysilicon Muscovite in the shear zone. It is shown that mineralization is related to regional shear structural deformation.
【作者單位】： 北京大學(xué)造山帶與地殼演化教育部重點實驗室;
【基金】：國家自然科學(xué)基金項目(批準號:41373043) 全國危機礦山接替資源找礦項目(編號:20089934)
【分類號】：P618.5

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