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Volume 27 Issue 3
Jun 2016
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Journal of Earth Science  > 2016  >  27(3): 403-411.
Tsuyoshi Ito, Xin Qian, Qinglai Feng. Geochemistry of Triassic siliceous rocks of the Muyinhe Formation in the Changning-Menglian belt of Southwest China. Journal of Earth Science, 2016, 27(3): 403-411. doi: 10.1007/s12583-016-0672-x
Citation: Tsuyoshi Ito, Xin Qian, Qinglai Feng. Geochemistry of Triassic siliceous rocks of the Muyinhe Formation in the Changning-Menglian belt of Southwest China. Journal of Earth Science, 2016, 27(3): 403-411. doi: 10.1007/s12583-016-0672-x
shu

Geochemistry of Triassic siliceous rocks of the Muyinhe Formation in the Changning-Menglian belt of Southwest China

doi: 10.1007/s12583-016-0672-x
  • 1.

    State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China

  • 2.

    Stratigraphy and Tectonics Research Group, Institute of Geology and Geoinformation, Geological Survey of Japan, AIST, Tsukuba, 305-8567, Japan

  • 3.

    School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China

More Information
  • Corresponding author: Tsuyoshi Ito, ito-t@aist.go.jp
  • Received Date: 11 Jun 2015
  • Accepted Date: 12 Dec 2015
  • Publish Date: 10 Jun 2016
    Abstract
  • The Changning-Menglian belt, distributed over southwestern Yunnan Province in Southwest China, contains oceanic rocks that are considered to be remnants of the Paleotethys. This study observed Triassic siliceous rocks of the Muyinhe Formation in the Changning-Menglian belt and analyzed their geochemistry. The samples have high concentrations of SiO2 (81.65 wt.%–88.38 wt.%; average: 84.99 wt.%±2.14 wt.%). Most of the samples were plotted in the non-hydrothermal field on the Al-Fe-Mn diagram. Most of the samples were plotted in the continental margin field on the Fe2O3/TiO2-Al2O3/(Al2O3+Fe2O3) and (La/Ce)N-Al2O3/(Al2O3+Fe2O3) diagrams. Moreover, the samples show a flat REE (rare earth element) pattern normalized to NASC (North America shale composite). These geochemical results, in addition to the lack of rhythmical bedding of the siliceous rocks, strongly suggest that the siliceous rocks are unlikely to represent pelagic deposits. Although previous studies have suggested that the siliceous rocks are pelagic deposits, the present results indicate that the extent of the pelagic ocean basins in the Paleotethys during the Triassic is probably less than previously believed. These non-pelagic deposits may represent the closure stage of the Paleotethys.

     

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