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《中国科学院地质与地球物理研究所第11届(2011年度)学术年会论文集(下)》 2012年
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Magmatic-hydrothermal evolution of the Cretaceous Duolong gold-rich porphyry copper deposit in the Bangongco metallogenic belt,Tibet:Evidence from U-Pb and ~(40)Ar/~(39)Ar geochronology

【摘要】:正The Duolong gold-rich porphyry copper deposit was recently discovered and represents a giant prospect (inferred resources of 4-5 Mt fine-Cu with a grade of 0.72%Cu;30-50t fine-gold with a grade of 0.23 g/t Au) in the Bangongco metallogenic belt,Tibet.Zircon SHRIMP and LA-ICP-MS U-Pb geochronology shows that the multiple porphyritic intrusions were emplaced during two episodes,the first at about 121 Ma (Bolong mineralized granodiorite porphyry(BMGP) and barren granodiorite porphyry(BGP)) and the second about 116 Ma(Duobuza mineralized granodiorite porphyry(DMGP)).Moreover,the basaltic andesites also have two episodes at about 118 Ma and 106 Ma,respectively.One andesite yields an U-Pb zircon age of 111.9±1.9 Ma,indicating it formed after the multiple granodiorite porphyries.By contrast, the ~(40)Ar/~(39)Ar age of 115.2±1.1 Ma(hydrothermal K-feldspar vein hosted in DMGP) reveals the close temporal relationship of ore-bearing potassic alteration to the emplacement of the DMGP.The sericite from quartz-sericite vein(hosted in DMGP) yields a ~(40)Ar/~(39)Ar age of 115.2±1.2 Ma.Therefore,the ore-forming magmatic-hydrothermal evolution probably persisted for 6 m.y.Additionally,the zircon U-Pb ages(106-121 Ma) of the volcanic rocks and the porphyries suggest that the Neo-Tethys Ocean was still subducting northward during the Early Cretaceous.

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