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SONG Tai-zhong, ZHAO Hai-Xia, ZHANG Wei-kuan, et al. The Geological Features of Shizigou Ophiolites in Qimantage Area[J]. Northwestern Geology, 2010, 43(4): 124-133.
Citation: SONG Tai-zhong, ZHAO Hai-Xia, ZHANG Wei-kuan, et al. The Geological Features of Shizigou Ophiolites in Qimantage Area[J]. Northwestern Geology, 2010, 43(4): 124-133.
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The Geological Features of Shizigou Ophiolites in Qimantage Area

  • Qinghai Institute of Geological Survey, Xining 810012, China

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  • Received Date: March 31, 2010
  • Revised Date: September 11, 2010
  • Published Date: December 04, 2010
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    • Abstract
  • The Shizigou ophilite occurs in the western of East Kunlun,that is the eastern of the suture zone in Qimantage.Its L-RRE elements have weakly depleted features,with a gradual increase of the total of REE from ultra-basic rocks to basic rocks and basic volcanic rocks,which belong to MORB and the whole rock chemical compositions of which are consistent with low-Ktholeiite of the MORB.They all inherit the characteristic of the source of the mantle with the same distribution patterns,and their REE show a characteristic of basic volcanic rocks and back-arc basin basalts.The ratio of the εNd (t) shows the source of basalts is from D-mantle,and the overall geochemical features suggest the main composition feature of N-MORB with the characteristic of E-MORB at the same time.They formed at the subduction-related environment of the back-arc basin at Late Ordovician and experienced more than three superposition and transformation of the tectonic deformation and the metamorphism and finally transported to the surface at Early-Silurian.
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