气候变化领域集成服务门户(CCPortal): Tectonic evolution of the north Lhasa subterrane: insights from early Cretaceous marine strata in the Asuo area, central Tibet

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DOI	10.1007/s00531-023-02333-2
	Tectonic evolution of the north Lhasa subterrane: insights from early Cretaceous marine strata in the Asuo area, central Tibet
	Shen, Di; Wang, Ming; Yu, Chang-Sheng; Zhang, Sheng-Shuo; Tenzin, Trevon
发表日期	2023
ISSN	1437-3254
EISSN	1437-3262
英文摘要	The mid-Cretaceous Langshan Formation, which crops out on the north Lhasa subterrane, central Tibet, is composed of a thick carbonate sequence with local volcanic rock and sandstone interlayers. In this study, we present data from the Asuo area, including fossil assemblages within carbonates, detrital zircon U-Pb ages of sandstone interlayers, zircon U-Pb ages and whole-rock geochemistry of andesite interlayers within the Langshan Formation to provide new constraints on the tectonic evolution of north Lhasa subterrane. The fossil assemblage indicates that the Langshan Formation was deposited on a carbonate platform at water depths of approximately 0-50 m during the late Albian to early Cenomanian period. The volcanic rock interlayers (111-109 Ma) primarily consist of high-K calc-alkaline andesites/dacites (SiO2: 56.48-67.03 wt. %; Mg#: 42.5-58.9). These andesites exhibit limited evidence of significant modification by crustal contamination. The high Mg# values and arc-like trace element signatures suggest that the andesites may have resulted from partial melting of the mantle wedge induced by fluids derived from a subducted slab. Furthermore, the lithic fragments within the sandstone interlayers predominantly exhibit characteristics of recycled orogen and arc orogen, indicating that the sandstone was derived from recycled ancient strata and a few magmatic arc materials. Considering the regional paleogeographic context, the carbonate accumulation of the Langshan Formation appears to have occurred nearly simultaneously with a period of high-flux magmatism, long-term slow tectonic subsidence, and the closure of the Meso-Tethys Ocean. The arc-arc soft collision provides a plausible mechanism to explain the widespread and rapid accumulation of thick carbonates in collision settings. It also accounts for the presence of magmatic rocks with enhanced mantle contributions on both sides of the north Lhasa subterrane.
关键词	Tibetan Plateau Meso-Tethys Ocean Arc-arc soft collision Langshan Formation
英文关键词	BANGONG-NUJIANG SUTURE; U-PB; ZIRCON GEOCHRONOLOGY; MAGNESIAN ANDESITES; SOUTHERN QIANGTANG; BASIN EVOLUTION; MIDDLE SEGMENT; VOLCANIC-ROCKS; CRUSTAL GROWTH; TRACE-ELEMENT
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001040899600001
来源期刊	INTERNATIONAL JOURNAL OF EARTH SCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283277
作者单位	Jilin University; Ministry of Natural Resources of the People's Republic of China
推荐引用方式 GB/T 7714	Shen, Di,Wang, Ming,Yu, Chang-Sheng,et al. Tectonic evolution of the north Lhasa subterrane: insights from early Cretaceous marine strata in the Asuo area, central Tibet[J],2023.
APA	Shen, Di,Wang, Ming,Yu, Chang-Sheng,Zhang, Sheng-Shuo,&Tenzin, Trevon.(2023).Tectonic evolution of the north Lhasa subterrane: insights from early Cretaceous marine strata in the Asuo area, central Tibet.INTERNATIONAL JOURNAL OF EARTH SCIENCES.
MLA	Shen, Di,et al."Tectonic evolution of the north Lhasa subterrane: insights from early Cretaceous marine strata in the Asuo area, central Tibet".INTERNATIONAL JOURNAL OF EARTH SCIENCES (2023).