Zircon U-Pb geochronology and Hf isotopic constraints on petrogenesis of Carnian Huanglonggou granodiorites inWulonggou area of Eastern Kunlun Orogen, NW China

doi:10.3969/j.issn.1673-9736.2018.02.02

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Global Geology ›› 2018, Vol. 21 ›› Issue (2) : 91-107. DOI: 10.3969/j.issn.1673-9736.2018.02.02

Zircon U-Pb geochronology and Hf isotopic constraints on petrogenesis of Carnian Huanglonggou granodiorites inWulonggou area of Eastern Kunlun Orogen, NW China

SONG Kai, DING Qingfeng, ZHANG Qiang

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Abstract

The Wulonggou area located in the Eastern Kunlun Orogen in NW China is characterized by extensive granitoid magmatism,ductile faulting and orogenic gold mineralization.The Huanglonggou granodiorite is cut by an orogenic gold-bearing fault.This study investigated the major and trace-element compositions,zircon U-Pb dates and zircon Hf isotopic compositions of the Huanglonggou granodiorite.One Huanglonggou granodiorite sample yielded a weighted mean U-Pb zircon age of ~221 Ma (Carnian).The Carnian granodiorite is metaluminous,with high alkalis contents of 6.37%-8.86%,high Al₂O₃ contents of 15.41%-16.19%,high Sr contents of (426-475)×10^-6,relatively high Sr/Y ratios,high (La/Yb)_Nvalues and low HREE,suggesting an adakite type high-SiO₂ granite.The Huanglonggou granodiorite sample has zircon ε_Hf(t) values ranging from-4.4 to+1.1.These Hf isotopic data suggest that the Carnian granodiorite was likely derived from the partial melting of subducted Paleo-Tethys oceanic slab.It is suggested that the Late Triassic granodiorite was emplaced during the northward subduction of Paleo-Tethys oceanic slab.Orogenic gold mineralization in the Wulonggou area formed after the emplacement of the Late Triassic intrusive rocks.

Key words

zircon U-Pb geochronology / zircon Hf isotope / Late Triassic / granodiorite / petrogenesis / Wulonggou area / Eastern Kunlun orogen

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SONG Kai, DING Qingfeng, ZHANG Qiang. Zircon U-Pb geochronology and Hf isotopic constraints on petrogenesis of Carnian Huanglonggou granodiorites inWulonggou area of Eastern Kunlun Orogen, NW China[J]. Global Geology. 2018, 21(2): 91-107 https://doi.org/10.3969/j.issn.1673-9736.2018.02.02

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