黎府构造带北部南莫溪蛇绿混杂岩的发现及其地质意义

吴松洋; 聂飞; 刘书生; 谢恩顺; 冷秋锋; 李雁龙; 吴振波; 张红

doi:10.3799/dqkx.2021.092

Volume 47 Issue 8

Sep. 2022

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Article Navigation > Earth Science > 2022 > 47(8): 2871-2888

Wu Songyang, Nie Fei, Liu Shusheng, Xie Enshun, Leng Qiufeng, Li Yanlong, Wu Zhenbo, Zhang Hong, 2022. The Discovery of Ophiolitic Complex in Namhonr, Northern Loei Tectonic Belt and Its Geological Significance. Earth Science, 47(8): 2871-2888. doi: 10.3799/dqkx.2021.092

Citation:

Wu Songyang, Nie Fei, Liu Shusheng, Xie Enshun, Leng Qiufeng, Li Yanlong, Wu Zhenbo, Zhang Hong, 2022. The Discovery of Ophiolitic Complex in Namhonr, Northern Loei Tectonic Belt and Its Geological Significance. Earth Science, 47(8): 2871-2888. doi: 10.3799/dqkx.2021.092

Citation:

Wu Songyang, Nie Fei, Liu Shusheng, Xie Enshun, Leng Qiufeng, Li Yanlong, Wu Zhenbo, Zhang Hong, 2022. The Discovery of Ophiolitic Complex in Namhonr, Northern Loei Tectonic Belt and Its Geological Significance. Earth Science, 47(8): 2871-2888. doi: 10.3799/dqkx.2021.092

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The Discovery of Ophiolitic Complex in Namhonr, Northern Loei Tectonic Belt and Its Geological Significance

doi: 10.3799/dqkx.2021.092

1.
Chengdu Center, China Geological Survey, Chengdu 610081, China
2.
Applied Geological Survey Center, China Geological Survey, Chengdu 610036, China
3.
Panxi Geological Brigade of Sichuan Bureau of Geology and Mineral Resources, Xichang 615000, China

Received Date: 2021-05-31
Publish Date: 2022-09-25

Abstract

Abstract

The Tethyan tectonic framework in Southeast Asia is complex, especially the tectonic evolution history and tectonic belt connection of Luang Prabang⁃Loei tectonic belt on the western margin of the Indo china block is more controversial. Basing on the geological mapping work, we discovered for the first time a well⁃preserved ophiolitic complex in the Namhonr area, northern Loei tectonic belt. In order to explore the attributes of the Loei tectonic belt and the regional paleogeographic pattern, the lithology identification for the ophiolitic complex, zircon LA⁃ICP⁃MS U⁃Pb dating forthe gabbro, paleobiology and major and trace elements for the radiolarian chert and reef limestone are presented in this paper. The results show that the outcroped end members of the ophiolitic complex include serpentinite, serpentinized peridotite, gabbro, diorite, basalt and siliceous rock, which display a complete sequence of ophiolitic complex. The LA⁃ICP⁃MS U⁃Pb ages of gabbro is 350.4±3.3 Ma, indicating the gabbro was formed in the Early Carboniferous. The coral species in the oceanic island⁃seamount are Thamnopora sp. and Paracravenia sp. which belong to the Middle Permian. The geochemical characteristics of the siliceous rock indicate that it is of biological origin and the sedimentary environment is an ocean basin or an open basin environment. A total of 30 species of radiolarians have been identified in 9 genera, which belong to the Middle Devonian⁃Early Carboniferous. The results of this research reflect that the ocean basin represented by the ophiolitic complex in the Namhonr area has a long⁃term evolution history, starting from the Late Devonian and continuing to the Middle Permian, the evolution duration is at least 135 Ma, indicating that the ophiolitic complex represents the residual Paleo⁃Tethys ocean basin, not the back⁃arc basin. We believe that the Loei tectonic belt should be connected to the Luang Prabang tectonic belt to the north, the Paleo⁃Tethys Ocean has existed in this area since the Late Devonian.
- ophiolitic complex,
- zircon U⁃Pb age,
- geochemistry,
- paleobiology,
- Paleo-Tethys Ocean,
- Loei tectonic belt

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References(74)

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The Discovery of Ophiolitic Complex in Namhonr, Northern Loei Tectonic Belt and Its Geological Significance

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