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Geochemistry of Triassic Siliceous Rocks of the Muyinhe Formation in the Changning-Menglian Belt of Southwest China

Tsuyoshi Ito Xin Qian Qinglai Feng

Tsuyoshi Ito, Xin Qian, Qinglai Feng. Geochemistry of Triassic Siliceous Rocks of the Muyinhe Formation in the Changning-Menglian Belt of Southwest China[J]. Journal of Earth Science, 2016, 18(3): 403-411. doi: 10.1007/s12583-016-0672-x
引用本文: Tsuyoshi Ito, Xin Qian, Qinglai Feng. Geochemistry of Triassic Siliceous Rocks of the Muyinhe Formation in the Changning-Menglian Belt of Southwest China[J]. Journal of Earth Science, 2016, 18(3): 403-411. doi: 10.1007/s12583-016-0672-x
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, 18(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, 18(3): 403-411. doi: 10.1007/s12583-016-0672-x

Geochemistry of Triassic Siliceous Rocks of the Muyinhe Formation in the Changning-Menglian Belt of Southwest China

doi: 10.1007/s12583-016-0672-x

Geochemistry of Triassic Siliceous Rocks of the Muyinhe Formation in the Changning-Menglian Belt of Southwest China

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出版历程
  • 收稿日期:  2016-06-12
  • 修回日期:  2016-06-12
  • 刊出日期:  2016-06-12

Geochemistry of Triassic Siliceous Rocks of the Muyinhe Formation in the Changning-Menglian Belt of Southwest China

doi: 10.1007/s12583-016-0672-x

摘要: 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 SiO 2 (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 Fe 2 O 3 /TiO 2 -Al 2 O 3 /(Al 2 O 3 +Fe 2 O 3 ) and (La/Ce) N -Al 2 O 3 /(Al 2 O 3 +Fe 2 O 3 ) 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 be- lieved. These non-pelagic deposits may represent the closure stage of the Paleotethys.

English Abstract

Tsuyoshi Ito, Xin Qian, Qinglai Feng. Geochemistry of Triassic Siliceous Rocks of the Muyinhe Formation in the Changning-Menglian Belt of Southwest China[J]. Journal of Earth Science, 2016, 18(3): 403-411. doi: 10.1007/s12583-016-0672-x
引用本文: Tsuyoshi Ito, Xin Qian, Qinglai Feng. Geochemistry of Triassic Siliceous Rocks of the Muyinhe Formation in the Changning-Menglian Belt of Southwest China[J]. Journal of Earth Science, 2016, 18(3): 403-411. doi: 10.1007/s12583-016-0672-x
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, 18(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, 18(3): 403-411. doi: 10.1007/s12583-016-0672-x

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