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Petrology and LA-ICP-MS zircon U-Pb age of the ore-bearing porphyry in the Walegen gold deposit at the juncture of the Qinling-Qilian-Kunlun orogens

Debiao Li, Niu Man-lan, Xia Wen-jing, Qi Wu, Lin‐Lin Wang

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Abstract

The middle Triassic calc-alkaline arc magmatism and its related porphyry-skarn type Cu-Au, Cu-Mo and Ag-Pb-Zn polymetallic deposits are widespread at the juncture of Qinling-Qilian-Kunlun orogens. The Walegen Au deposit is a newly-dis-covered porphyry deposit. The host rocks of the Walegen deposit are quartz porphyry and granite porphyry, with the quartz porphy-ry more closely related to gold mineralization. The results of zircon U-Pb analysis by using LA-ICP-MS technique indicate that the granite porphyry was formed in middle Triassic (237Ma), and contained voluminous Paleozoic-Proterozoic inherited zircons. These characteristics are similar to characteristics of other porphyry Cu-Au deposits in this region. These data suggest that the mag-mas produced by northward subduction of Paleo-tethys ocean captured pre-Triassic crust and mantle materials, resulting in the arc magmatism and the formation of related porphyry-skarn deposit assemblage at the juncture of Qinling-Qilian-Kunlun orogens.

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The middle Triassic calc-alkaline arc magmatism and its related porphyry-skarn type Cu-Au, Cu-Mo and Ag-Pb-Zn polymetallic deposits are widespread at the juncture of Qinling-Qilian-Kunlun orogens. The Walegen Au deposit is a newly-dis-covered porphyry deposit. The host rocks of the Walegen deposit are quartz porphyry and granite porphyry, with the quartz porphy-ry more closely related to gold mineralization. The results of zircon U-Pb analysis by using LA-ICP-MS technique indicate that the granite porphyry was formed in middle Triassic (237Ma), and contained voluminous Paleozoic-Proterozoic inherited zircons. These characteristics are similar to characteristics of other porphyry Cu-Au deposits in this region. These data suggest that the mag-mas produced by northward subduction of Paleo-tethys ocean captured pre-Triassic crust and mantle materials, resulting in the arc magmatism and the formation of related porphyry-skarn deposit assemblage at the juncture of Qinling-Qilian-Kunlun orogens.

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Available abstract

The middle Triassic calc-alkaline arc magmatism and its related porphyry-skarn type Cu-Au, Cu-Mo and Ag-Pb-Zn polymetallic deposits are widespread at the juncture of Qinling-Qilian-Kunlun orogens. The Walegen Au deposit is a newly-dis-covered porphyry deposit. The host rocks of the Walegen deposit are quartz porphyry and granite porphyry, with the quartz porphy-ry more closely related to gold mineralization. The results of zircon U-Pb analysis by using LA-ICP-MS technique indicate that the granite porphyry was formed in middle Triassic (237Ma), and contained voluminous Paleozoic-Proterozoic inherited zircons. These characteristics are similar to characteristics of other porphyry Cu-Au deposits in this region. These data suggest that the mag-mas produced by northward subduction of Paleo-tethys ocean captured pre-Triassic crust and mantle materials, resulting in the arc magmatism and the formation of related porphyry-skarn deposit assemblage at the juncture of Qinling-Qilian-Kunlun orogens.

Key concepts: Geology, Geochemistry, Zircon, Magmatism, Skarn, Paleozoic, Continental arc, Mineralization (soil science)

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Petrology and LA-ICP-MS zircon U-Pb age of the ore-bearing porphyry in the Walegen gold deposit at the juncture of the Qinling-Qilian-Kunlun orogens — Research Paper | ScholarLens