气候变化领域集成服务门户(CCPortal): A Residual Middle Triassic Oceanic Island-Seamount in the Maoershan Area, Northwest Tibet: Implications for the Evolution of the Paleo-Tethys Ocean

CCPortal

DOI	10.3390/min13121551
	A Residual Middle Triassic Oceanic Island-Seamount in the Maoershan Area, Northwest Tibet: Implications for the Evolution of the Paleo-Tethys Ocean
	Li, Chao; Wen, Junhao; Zhao, Zhongbao; Yang, Feng; Yan, Jiaxin; Tian, Ye; Su, Rong
发表日期	2023
EISSN	2075-163X
卷号	13 期号:12
英文摘要	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 similar to 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.
关键词	central Tibetan Plateau Longmuco-Shuanghu Paleo-Tethys Ocean oceanic island and seamount middle Triassic in situ origin
英文关键词	PB ISOTOPIC CHARACTERISTICS; RARE-EARTH-ELEMENTS; U-PB; CENTRAL QIANGTANG; NORTHERN TIBET; CONTINENTAL-CRUST; TRACE-ELEMENT; GEOCHEMICAL CHARACTERISTICS; DEPOSITIONAL ENVIRONMENT; PETROGENETIC EVOLUTION
WOS研究方向	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS记录号	WOS:001132468600001
来源期刊	MINERALS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283471
作者单位	China National Institute of Standardization; Ministry of Natural Resources of the People's Republic of China; China Geological Survey; Institute of Geology, Chinese Academy of Geological Sciences; Chinese Academy of Geological Sciences; China Geological Survey; Xi'an Center, China Geological Survey; China University of Geosciences - Beijing
推荐引用方式 GB/T 7714	Li, Chao,Wen, Junhao,Zhao, Zhongbao,et al. A Residual Middle Triassic Oceanic Island-Seamount in the Maoershan Area, Northwest Tibet: Implications for the Evolution of the Paleo-Tethys Ocean[J],2023,13(12).
APA	Li, Chao.,Wen, Junhao.,Zhao, Zhongbao.,Yang, Feng.,Yan, Jiaxin.,...&Su, Rong.(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).
MLA	Li, Chao,et al."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(2023).