2021 Vol. 48, No. 1
Article Contents

KONG Huilei, LI Yazhi, LI Jinchao, JIA Qunzi, GUO Xianzheng, WANG Yu, YAO Xuegang. 2021. Petrogenesis of Xiwanggou olivine gabbro in East Kunlun Mountains: Constraints from geochemistry, zircon U-Pb dating and Hf isotopes[J]. Geology in China, 48(1): 173-188. doi: 10.12029/gc20210113
Citation: KONG Huilei, LI Yazhi, LI Jinchao, JIA Qunzi, GUO Xianzheng, WANG Yu, YAO Xuegang. 2021. Petrogenesis of Xiwanggou olivine gabbro in East Kunlun Mountains: Constraints from geochemistry, zircon U-Pb dating and Hf isotopes[J]. Geology in China, 48(1): 173-188. doi: 10.12029/gc20210113

Petrogenesis of Xiwanggou olivine gabbro in East Kunlun Mountains: Constraints from geochemistry, zircon U-Pb dating and Hf isotopes

    Fund Project: Supported by China Geological Survey Program (No.DD20190143, No.DD20160013), National Key R & D Plan (No.2019YFC0605201) and The Second Tibetan Plateau Scientific Expedition and Research(No.2019QZKK0807-02)
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  • Author Bio: KONG Huilei, male, born in 1985, Ph.D. candidate, senior engineer, mainly engaged in the study of regional metallogeny and metallogenic regularity; E-mail:konghuilei2008@126.com
  • Corresponding author: LI Yazhi, female, born in 1979, Master, senior engineer, mainly engaged in the study of regional metallogeny and metallogenic regularity; E-mail:liyazhi2005@163.com 
  • The mafic-ultramafic rocks in Paleo-Tethys domain of East Kunlun Mountains are not well documented. In this paper, the authors present petrographical, geochronological, lithogeochemical and Hf isotopic data for the Xiwanggou olivine gabbro located in the eastern section of East Kunlun Mountains, Qinghai Province, with the purpose of constraining its formation age, petrogenesis and tectonic setting and providing new constraints for the Late Paleozoic-Early Mesozoic tectono-magmatic evolution in East Kunlun Mountains. Lithogeochemical studies show that the olivine gabbro, which is of sub-alkaline series, is characterized by low SiO2 (40.91%-42.14%), low TiO2 (0.29%-0.39%) and alkali content (K2O+Na2O=1.09%-1.36%) but high MgO content (28.18%-30.66%). The m/f ratios range from 5.03 to 5.39, falling into the field of ferrous-ultrabasic rocks. This suite of rocks are enriched in LILE (such as Rb, Th, U and K) and Pb, and relatively depleted in HFSE (such as Nb, P and Ti). The rocks have low REE content, with LREE-rich pattern and slightly negative Eu anomaly (ΣREE=28.1710-6-30.9510-6, (La/Yb)N=3.77-4.98, δEu=0.80-0.95). LA-ICP-MS zircon U-Pb dating indicates that the weighted mean age of olivine gabbro is (264.9±1.2)Ma(n=26, MSWD=0.71), suggesting Middle Permian. Zircon 176Hf/177Hf values are in the range of 0.282709-0.283152 with corresponding εHf(t) values of 3.7-19.3. and Lu-Hf single-stage modal ages (TDM) vary from 135 to 753 Ma with mean age being 414Ma, older than U-Pb age. The authors hold that the parental magma of olivine gabbro was likely derived from the depleted mantle, with the probable addition of fluid-modified lithospheric mantle components, and was contaminated by crustal material. Combined with evolutionary characteristics of regional structures in East Kunlun Mountains, the authors consider that Xiwanggou olivine gabbro was formed during the subduction of Anyemaqen-Paleo-Tethys Ocean, and the northward subduction of Anyemaqen-Paleo-Tethys Ocean started at least in Middle Permian.

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