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WANG Jian-zhong, QIAN Zhuang-zhi, GAO Ping, et al. Geochemical Characteristics and Tectonic Environment of Volcanic Rocks in Suhaitu Arear, Xinjiang[J]. Northwestern Geology, 2014, 47(2): 11-22.
Citation: WANG Jian-zhong, QIAN Zhuang-zhi, GAO Ping, et al. Geochemical Characteristics and Tectonic Environment of Volcanic Rocks in Suhaitu Arear, Xinjiang[J]. Northwestern Geology, 2014, 47(2): 11-22.
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Geochemical Characteristics and Tectonic Environment of Volcanic Rocks in Suhaitu Arear, Xinjiang

  • 1. No. 5 Gold Geological Branch, Chinese People's Armed Police Force, Xi'an 710100, China;

  • 2. Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Chang'an University, Xi'an 710054, China;

  • 3. Geophysical and Geochemical Exploration Corps of Northwest Mining Group for Nonferrous Metals, Xi'an 710068, China

More Information
  • Received Date: January 04, 2014
  • Revised Date: April 15, 2014
  • Available Online: July 28, 2022
  • Published Date: June 04, 2014
    Graphical Abstract
    • Abstract
  • Native copper mineralization has been found in volcanic rocks of Suhaitu formation, with a feature of transition from tholeiite basalts to calc-alkaline basalts. Geochemistry shows that the volcanic rocks have lower TiO2 content(less than 1%), fewer Rare Earth Elements and high Al2O3 content. In addition, their REE pattern is characterized by the weak enrichment of LREE. In the primitive mantle normalized trace element spider diagram, Suhaitu volcanic rocks are characterized by the enrichment of large ion lithophile elements, and deficit of the high field strength element. They have strongly negative anomalies in Nb and Ta, weakly negative anomalies in Ti, and weakly positive anomalies in P and Sm. Their Zr/Nb and Sm/Nd ratios are close to the range of MORB, the value of Th/Nb is larger than 0.11, while the Nb/Zr ratio is less than 0.04. All these characteristics mentioned above suggest that volcanic rocks of Suhaitu formation were typical volcanic arc rocks, their tectonic environment was continental island arc, and its magmas were generated by partial melting of the depleted mantle modified by fluids or sediments.
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