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Article

A Residual Middle Triassic Oceanic Island-Seamount in the Maoershan Area, Northwest Tibet: Implications for the Evolution of the Paleo-Tethys Ocean

by
Chao Li
1,2,*,
Junhao Wen
3,
Zhongbao Zhao
2,4,
Feng Yang
1,*,
Jiaxin Yan
5,
Ye Tian
6 and
Rong Su
7
1
China National Institute of Standardization, Beijing 100191, China
2
Key Laboratory of Continental Tectonics and Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
3
Administrative and Protection Bureau of China Precambrian Provincial Geological Nature Reserve, Kunming 650600, China
4
Jiangsu Donghai Continental Deep Hole Crustal Activity National Observation and Research Station, Lianyungang 222300, China
5
Xi’an Center of Geological Survey, China Geological Survey, Xi’an 710054, China
6
Beijing Urban Construction Exploration & Surveying Design Research Institute Co., Ltd., Beijing 100101, China
7
School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China
*
Authors to whom correspondence should be addressed.
Minerals 2023, 13(12), 1551; https://doi.org/10.3390/min13121551
Submission received: 22 September 2023 / Revised: 12 December 2023 / Accepted: 12 December 2023 / Published: 15 December 2023
(This article belongs to the Section Mineral Geochemistry and Geochronology)
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Abstract

The assemblage of oceanic islands and seamounts, arising from the widespread presence of mature oceans, plays a crucial role in reconstructing the evolutionary history of the paleoocean. Oceanic islands or seamounts within the Longmuco-Shuanghu metamorphic complex, a remnant of the Paleo-Tethys Ocean in the central Tibetan Plateau, have seldom been reported due to their remoteness. This study has identified an oceanic island-seamount in the Maoershan area, situated to the west of the Longmuco-Shuanghu metamorphic complex, composed of basalt, diabase, limestone, and siliceous rocks. Based on field observations, petrology, zircon U-Pb dating, whole-rock geochemistry, and Sr-Nd isotopes analyses, we have identified a suite of mafic rocks with OIB affinity. The youngest zircon U-Pb age cluster was concentrated at ~243–241 Ma. The geochemical characteristics of the siliceous rocks indicate a mixture of terrigenous material, suggesting that they formed in a continental margin. In combination with regional geological data, we conclude that the Longmuco-Shuanghu Paleo-Tethys Ocean remained open during the Middle Triassic. Furthermore, a fraction of the oceanic island-seamounts underwent scraping and transformed into a metamorphic complex, while other segments experienced deep subduction, resulting in the formation of high-pressure metamorphic rocks. Collectively, these processes gave rise to the distinctive high-pressure metamorphic complex within the central Qiangtang terrane.
Keywords: central Tibetan Plateau; Longmuco-Shuanghu Paleo-Tethys Ocean; oceanic island and seamount; middle Triassic; in situ origin central Tibetan Plateau; Longmuco-Shuanghu Paleo-Tethys Ocean; oceanic island and seamount; middle Triassic; in situ origin

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MDPI and ACS Style

Li, C.; Wen, J.; Zhao, Z.; Yang, F.; Yan, J.; Tian, Y.; Su, R. A Residual Middle Triassic Oceanic Island-Seamount in the Maoershan Area, Northwest Tibet: Implications for the Evolution of the Paleo-Tethys Ocean. Minerals 2023, 13, 1551. https://doi.org/10.3390/min13121551

AMA Style

Li C, Wen J, Zhao Z, Yang F, Yan J, Tian Y, Su R. A Residual Middle Triassic Oceanic Island-Seamount in the Maoershan Area, Northwest Tibet: Implications for the Evolution of the Paleo-Tethys Ocean. Minerals. 2023; 13(12):1551. https://doi.org/10.3390/min13121551

Chicago/Turabian Style

Li, Chao, Junhao Wen, Zhongbao Zhao, Feng Yang, Jiaxin Yan, Ye Tian, and Rong Su. 2023. "A Residual Middle Triassic Oceanic Island-Seamount in the Maoershan Area, Northwest Tibet: Implications for the Evolution of the Paleo-Tethys Ocean" Minerals 13, no. 12: 1551. https://doi.org/10.3390/min13121551

APA Style

Li, C., Wen, J., Zhao, Z., Yang, F., Yan, J., Tian, Y., & Su, R. (2023). A Residual Middle Triassic Oceanic Island-Seamount in the Maoershan Area, Northwest Tibet: Implications for the Evolution of the Paleo-Tethys Ocean. Minerals, 13(12), 1551. https://doi.org/10.3390/min13121551

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