西藏仁布县康雄金矿侵入岩锆石U-Pb年代学及成矿背景
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摘要
探讨西藏仁布县康雄金矿的形成背景。在野外地质调查基础上,对矿区出露的侵入岩开展了LA-ICP-MS锆石U-Pb年代学研究。结果表明,矿体附近出露岩浆岩的活动顺序依次为:晚侏罗世细粒花岗岩(150.5±1.8 Ma B.P., MSWD=0.18)、始新世早期石英闪长岩(48.94±0.56 Ma B.P., MSWD=0.29)、始新世中期黑云母花岗岩(46.91±0.53 Ma B.P., MSWD=0.38)、始新世中期含铜富石英伟晶岩(44.38±0.57 Ma B.P., MSWD=0.54)、始新世晚期闪长岩(41.90±0.61 Ma B.P., MSWD=0.31)、渐新世早期闪长玢岩(32.81 Ma B.P.)。这些岩浆岩均被康雄金矿的赋矿断裂切割,表明该矿床形成于32.81 Ma B.P.之后,明显晚于印度-亚洲陆-陆碰撞的主碰撞阶段(65～40 Ma B.P.),不同于雅鲁藏布江缝合带中的马攸木金矿和邦布金矿形成于强烈碰撞挤压背景,而是形成于渐新世末-中新世高原加厚岩石圈的拆沉环境。
Field geological survey and LA-ICP-MS zircon U-Pb dating are carried out in order to study the metallogenetic setting of Kangxiong gold deposit in Renbu Country of Tibet, which occurred near the boundary of Gangdese block and Yarlung Tsangpo Suture Zone. LA-ICP-MS zircon U-Pb dating for the intrusions occurred in Kangxiong gold deposit obtained following results. There are late Jurassic fine grained biotite granite(150.5±1.8 Ma B.P., MSWD=0.18), early Eocene quartz diorite(48.94±0.56 Ma B.P., MSWD=0.29), middle Eocene medium-coarse grained biotite monzonitic granite(46.91±0.53 Ma B.P., MSWD=0.38), middle Eocene quartz-rich pegmatite with copper mineralization(44.38±0.57 Ma B.P., MSWD=0.54), late Eocene diorite(41.90±0.61 Ma B.P., MSWD=0.31), early Oligocene diorite porphyry(32.81 Ma B.P.). Kangxiong gold deposit was formed after 32.81 Ma B.P., later than the main collision stage of India and Asian plates(65～40 Ma B.P.), because all of the intrusions have been truncated by ore-bearing faults in the Kangxiong area. It is considered that the metallogenetic setting of Kangxiong gold deposit is different from that of Mayoumu and Bangbu. The former was formed in late Oligocene to Miocene Epoch, as a result of the delamination and thickening of plateau lithosphere, while the latter was formed in collisional compression environment.
Field geological survey and LA-ICP-MS zircon U-Pb dating are carried out in order to study the metallogenetic setting of Kangxiong gold deposit in Renbu Country of Tibet, which occurred near the boundary of Gangdese block and Yarlung Tsangpo Suture Zone. LA-ICP-MS zircon U-Pb dating for the intrusions occurred in Kangxiong gold deposit obtained following results. There are late Jurassic fine grained biotite granite(150.5±1.8 Ma B.P., MSWD=0.18), early Eocene quartz diorite(48.94±0.56 Ma B.P., MSWD=0.29), middle Eocene medium-coarse grained biotite monzonitic granite(46.91±0.53 Ma B.P., MSWD=0.38), middle Eocene quartz-rich pegmatite with copper mineralization(44.38±0.57 Ma B.P., MSWD=0.54), late Eocene diorite(41.90±0.61 Ma B.P., MSWD=0.31), early Oligocene diorite porphyry(32.81 Ma B.P.). Kangxiong gold deposit was formed after 32.81 Ma B.P., later than the main collision stage of India and Asian plates(65～40 Ma B.P.), because all of the intrusions have been truncated by ore-bearing faults in the Kangxiong area. It is considered that the metallogenetic setting of Kangxiong gold deposit is different from that of Mayoumu and Bangbu. The former was formed in late Oligocene to Miocene Epoch, as a result of the delamination and thickening of plateau lithosphere, while the latter was formed in collisional compression environment.
引文
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