Tectonic settings of porphyry Cu–Mo–Au deposits in the Himalayan–Tibetan orogen, East Tethys

The alkali-rich rocks, spreading along the suture zone of Jingsha River, refer to the alkali-rich porphyry rocks, which emplace during the Himalaya epoch in northwest of Yunnan Province, and consist of syenit, syenit porphyry, monzonite porphyry and granite porphyry. Petrological chemical analysis results suggest that silica is poor and aluminum is rich, and high potassium large ion lithophile elements (LILE), light rare earth element (LREE) and Sr are obviously detracted in these rocks. High field strength elements (HFSE) and heavy rare earth element (HREE) are depleted, especially Nb, Ta, P and Ti. δ Eu : 0.09−1.64 shows that plagioclase does not appear fractional crystallization during the formation of alkali-rich rocks. δ 34 S, H and O isotopes and Pb isotopes suggest that ore-forming fluid is derived from the mantle, and Pb is possibly mixed by mantle, wall rock and crust. The age of Pb in alkali-rich rocks is about 250−220 Ma. The age of alkali porphyry rock (dykes) varies from 30 Ma to 50 Ma. Alkali rocks have strong metallogenetic relation. Au mineralization is associated to the alkali magmatic activities with a relatively high temperature, low pressure and high oxygen fugacity. However, copper mineralization is mainly associated with alkali-sub-alkali magmatic activities in a process of relatively low temperature, high pressure and lower oxygen fugacity.

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Petrological characteristics, geochemical feature and metallogenetic relation of alkaline-rich rocks in northwest of Yunan Province, China

Zhang

Dai

2011

J. Cent. South Univ. Technol.

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A syn-collisional model for Early Cretaceous magmatism in the northern and central Lhasa subterranes

et al. 2017

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Geology, geochemistry and geochronology of the Jiaojiguanliangzi Fe-polymetallic deposit, Tengchong County, Western Yunnan (China): Regional tectonic implications

Cao

Zhang

Lin

et al. 2014

Journal of Asian Earth Sciences

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Tectonic settings of porphyry Cu–Mo–Au deposits in the Himalayan–Tibetan orogen, East Tethys

Cited by 9 publications

References 22 publications

Petrological characteristics, geochemical feature and metallogenetic relation of alkaline-rich rocks in northwest of Yunan Province, China

Petrological characteristics, geochemical feature and metallogenetic relation of alkaline-rich rocks in northwest of Yunan Province, China

A syn-collisional model for Early Cretaceous magmatism in the northern and central Lhasa subterranes

Geology, geochemistry and geochronology of the Jiaojiguanliangzi Fe-polymetallic deposit, Tengchong County, Western Yunnan (China): Regional tectonic implications

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