Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (6): 1552-1564.doi: 10.13278/j.cnki.jjuese.20180253

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Characteristics and Tectonic Significance of Chromites from Chonggenshan Ophiolite in Inner Mongolia

Wang Cheng1, Ren Limin2, Zhang Xiaojun3, Yu Guofei4, Fang Lei5   

  1. 1. Xinjiang Geological Survey Academy, Urumchi 830000, China;
    2. School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;
    3. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;
    4. No. 1 Geological Party of Hubei Geological Bureau, Huangshi 435100, Hubei, China;
    5. No. 266 Geological Party of Jiangxi Nuclear Industrial Geological Bureau, Nanchang 330038, China
  • Received:2018-10-02 Published:2019-11-30
  • Supported by:
    Supported by Project of China Geological Survey (1212011220448)

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Abstract: In order to analyze the formation physicochemical conditions and tectonic environment of the Hegenshan ophiolite in Inner Mongolia, the unaltered chromites from the Chonggenshan ophiolite were chosen to study their mineralogy and mineral geochemistry. The result shows that the chromites consist of Cr2O3 (38.86%-39.12%), Al2O3 (26.56%-26.92%),and TFeO (17.37%-17.50%), Cr# values of 49.34-49.58, Mg#values of 68.82-69.73, Yfe values of 6.62-6.97,and Fe2+#values of 30.27-31.18, without texture zoning. They are aluminum-rich chromites. The average crystallization temperature and pressure of the chromite are estimated to be 1 396.88℃ and 3.35 GPa, respectively, indicating its formation depth of about 103.72 km. It is inferred that the Chonggenshan chromite-hosting peridotite was derived from the garnet lherzolites in depleted upper mantle with oxygen fugacities from FMQ+1.41 to FMQ+1.45 lg units (average FMQ +1.43 lg units), and partial melting degree of the mantle from 20.93% to 20.95% (average 20.94%). The chromites show the characteristics of super-subduction zone. We believe that the Chonggenshan ophiolite was formed in the background of intra-oceanic back-arc basin in the subduction zone.

Key words: chromite, ophiolite, intra-oceanic back-arc basin, Chonggenshan, Hegenshan

CLC Number: 

  • P618.33
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