Volume 24 Issue 5
Oct.  2018
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Article Navigation >  Journal of Geomechanics  > 2018  >  24(5): 661-669
ZHUAN Shaopeng, BAI Chundong, MAO Zhifang, et al., 2018. ZIRCON U-Pb AGES AND GEOCHEMICAL CHARACTERISTICS OF THE SUGAITILIKE LATE SILURIAN GRANITES IN SOUTHERN KUDI, XINJIANG AND ITS GEOTECTONIC SIGNIFICANCE. Journal of Geomechanics, 24 (5): 661-669. DOI: 10.12090/j.issn.1006-6616.2018.24.05.066
Citation: ZHUAN Shaopeng, BAI Chundong, MAO Zhifang, et al., 2018. ZIRCON U-Pb AGES AND GEOCHEMICAL CHARACTERISTICS OF THE SUGAITILIKE LATE SILURIAN GRANITES IN SOUTHERN KUDI, XINJIANG AND ITS GEOTECTONIC SIGNIFICANCE. Journal of Geomechanics, 24 (5): 661-669. DOI: 10.12090/j.issn.1006-6616.2018.24.05.066
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ZIRCON U-Pb AGES AND GEOCHEMICAL CHARACTERISTICS OF THE SUGAITILIKE LATE SILURIAN GRANITES IN SOUTHERN KUDI, XINJIANG AND ITS GEOTECTONIC SIGNIFICANCE

doi: 10.12090/j.issn.1006-6616.2018.24.05.066

  • Hebei Institute of Regional Geological Survey, Langfang 065000, Hebei, China

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  • Received: 2018-04-12
  • Revised: 2018-07-30
  • Published: 2018-10-01
    Abstract
  • There are different opinions about the division of post-collisional stages of the Early Paleozoic Proto-Tethys Ocean in the West Kunlun area. In this paper, researches including regional geological survey, petrology, geochemistry, zircon U-Pb chronology, etc. were carried out on Sugaitilike granites, south side of Kudi ophiolite, which provide a geological basis for the tectonic evolution and closing time limit of the Proto-Tethys Ocean. The results show that, the age of zircon U-Pb(LA-ICP-MS) is 422.5±2.5 Ma, making granites products of the late Silurian magma activities. Sugaitilike granite contains typical mineral muscovite, A/CNK=1.07~1.11, and the content of corundum is 1.07~1.56%, belonging to S-type granite. Geochemically, the rock body is rich in silicon, alkali, calcium-depleted, magnesium-rich, rich in K, Rb, Nb, Th, lean in Sr, Ti, P, and high in Rb/Sr ratio. The comprehensive analysis of the geological background and geochemical characteristics of the Sugeitik granite area shows that granites are the products of the collision phase of the Proto-Tethys Ocean. Therefore, the late Silurian is the transition period from the closing of the Proto-Tethys Ocean to the collision of land and land-the period of post-collisional extension transformation.

     

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