The geochemical features of the monzonitic granite in Qimantage Hutouya deposit area, Qinghai, in respect to the mineralization, suggest that this granite belongs to weak peraluminous and high-k calc alkaline rock series. The REE of the samples show right slope with obvious LREE/HREE differentiation and negative Eu abnormity. The trace elements show enrichment of LILE (Rb, Th, U, La, Nd), and deleption of Ba, Sr, Nd, P, Ti. The Sr-Nb isotopic data indicate that the magma source is mainly aluminosilicate lower crust with a small amount of new crustal materials. The weighted mean zircon U-Pbage of the Hutouya monzonitic granite is 221±1.7 Ma, belonging to Late Triassic. The Hutouya monzonitic granite was formed in the tectonic setting of transition from compression to extension during Middle-Late Triassic.
Key words
monzonitic granite /
zircon U-Pb age /
geochemistry /
Hutouya /
Qimantage /
Qinghai
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Funding
Supported by Project of China Geological Survey (No.20150209-01-079)
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