气候变化领域集成服务门户(CCPortal): Response of the North Lhasa terrane to the initial break-up of Rodinia: Evidence from the newly identified early Neoproterozoic gabbros in the Asa area, southern Tibet

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DOI	10.1016/j.precamres.2023.106971
	Response of the North Lhasa terrane to the initial break-up of Rodinia: Evidence from the newly identified early Neoproterozoic gabbros in the Asa area, southern Tibet
	Yu, Changsheng; Wang, Ming; Shen, Di; Zeng, Xiaowen; Li, Hang
发表日期	2023
ISSN	0301-9268
EISSN	1872-7433
卷号	386
英文摘要	Due to the less exposure of Precambrian basement, the origin of ancient continental blocks in the Tibetan plateau and their paleogeographic locations in the Rodinia supercontinent remain enigmatic. Here we first report the newly identified Precambrian basement from the Asa region of the North Lhasa terrane (NL), southern Tibet. The zircon U-Pb age and whole-rock geochemical data on gabbro intrusions (known as Tugu gabbros) in this basement reveal an important tectonic evolution process of continental-oceanic transition experienced by the North Lhasa terrane in the early Neoproterozoic (ca. 900-875 Ma), which may be the prelude to the disinte-gration of Rodinia in China. Tugu gabbros (ca. 876-874 Ma) belong to the series of sub-alkaline tholeiitic basalt and have N-MORB geochemical affinities. In combination, the high (87Sr/86Sr)i ratios (0.709-0.711), positive epsilon Nd(t) values (2.8-3.9) and the relatively young Nd isotopic pattern age (tDM C = 1.2-1.3 Ga) indicate that it came from a depleted mantle source and were formed in an intercontinental rift environment on the northern margin of Rodinia. According to previous studies and data provided herein, the era and nature of Precambrian magmatic-metamorphic records in North and South Lhasa terranes cannot be compared, suggesting these may have been two separate terranes in the Precambrian. We propose that the South Lhasa terrane (SL) originated from India, while the North Lhasa terrane may originate from Australia. After splitting from Australia at ca. 930-875 Ma, the North Lhasa terrane continued to drift westward owing to the break-up of Rodinia. During the process of drifting, the North Lhasa terrane received sedimentary input from India and developed Andean-type arc magmatism with the influence of oceanic subduction on the northwest margin of supercontinent.
关键词	Tibet North Lhasa terrane Rodinia Supercontinent break-up Intercontinental rift
英文关键词	BACK-ARC SYSTEM; TRACE-ELEMENT; PB GEOCHRONOLOGY; VOLCANIC-ROCKS; ISOTOPIC GEOCHEMISTRY; TECTONIC EVOLUTION; EAST ANTARCTICA; MAFIC MAGMATISM; MARIANA TROUGH; SEA-WATER
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:000926859500001
来源期刊	PRECAMBRIAN RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282968
作者单位	Jilin University; Ministry of Natural Resources of the People's Republic of China; Jilin University; China Geological Survey; Chengdu Center, China Geological Survey
推荐引用方式 GB/T 7714	Yu, Changsheng,Wang, Ming,Shen, Di,et al. Response of the North Lhasa terrane to the initial break-up of Rodinia: Evidence from the newly identified early Neoproterozoic gabbros in the Asa area, southern Tibet[J],2023,386.
APA	Yu, Changsheng,Wang, Ming,Shen, Di,Zeng, Xiaowen,&Li, Hang.(2023).Response of the North Lhasa terrane to the initial break-up of Rodinia: Evidence from the newly identified early Neoproterozoic gabbros in the Asa area, southern Tibet.PRECAMBRIAN RESEARCH,386.
MLA	Yu, Changsheng,et al."Response of the North Lhasa terrane to the initial break-up of Rodinia: Evidence from the newly identified early Neoproterozoic gabbros in the Asa area, southern Tibet".PRECAMBRIAN RESEARCH 386(2023).