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

Tsuyoshi Ito; Xin Qian; Qinglai Feng

doi:10.1007/s12583-016-0672-x

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

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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

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

doi: 10.1007/s12583-016-0672-x

Tsuyoshi Ito^{1, 2
,
,},
Xin Qian^{1, 3},
Qinglai Feng^{1, 3}

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

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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

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.
- geochemistry,
- Triassic,
- siliceous rock,
- Paleotethys,
- Muyinhe Formation,
- Changning-Menglian belt

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References(46)

References

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

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

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