气候变化领域集成服务门户(CCPortal): K-Rich Adakite-Like Rocks in Central Tibet: Fractional Crystallization of a Hydrous, Alkaline Primitive Melt

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DOI	10.1029/2022GL099887
	K-Rich Adakite-Like Rocks in Central Tibet: Fractional Crystallization of a Hydrous, Alkaline Primitive Melt
	Xu, Wei; Weinberg, Roberto F. F.; Tian, Shi-Hong; Hou, Zeng-Qian; Yang, Zhu-Sen; Chen, Lu; Lai, Feng
发表日期	2023
ISSN	0094-8276
EISSN	1944-8007
卷号	50 期号:10
英文摘要	K-rich adakite-like rocks (KARs) in post-collisional settings, such as in Tibet, have been widely linked with the melting of pre-existing thickened crust. Here, we investigate geochemical data of the Late Eocene (38-34 Ma) volcanic rocks including KARs from the southern Qiangtang terrane (SQT) of central Tibet. The data reveal that: (a) the volcanic rocks define a fractionation trend from high-K alkaline basalt to high-K calc-alkaline rhyolite, with a continuous compositional range and (b) they are characterized by a narrow range of depleted Sr-Nd isotopic compositions relative to the pre-Eocene SQT crust. We contend that the KARs in the SQT resulted from fractional crystallization of hydrous, alkaline melts derived from the lithospheric mantle where fractionation was dominated by amphibole and plagioclase. Partial melting of the lithospheric mantle beneath the SQT was possibly triggered by thermal perturbations owing to the north-directed subduction of the Indian continental lithosphere beneath southern Tibet.
英文关键词	NADINGCUO VOLCANIC-ROCKS; SOUTHERN QIANGTANG; U-PB; CHEMICAL CLASSIFICATION; CONTINENTAL-CRUST; INTRUSIVE ROCKS; GEOCHEMISTRY; ARC; SUBDUCTION; SLAB
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:000999861700001
来源期刊	GEOPHYSICAL RESEARCH LETTERS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282957
作者单位	East China University of Technology; Monash University; China Geological Survey; Chinese Academy of Geological Sciences; China Geological Survey; Institute of Geology, Chinese Academy of Geological Sciences; Chinese Academy of Geological Sciences
推荐引用方式 GB/T 7714	Xu, Wei,Weinberg, Roberto F. F.,Tian, Shi-Hong,et al. K-Rich Adakite-Like Rocks in Central Tibet: Fractional Crystallization of a Hydrous, Alkaline Primitive Melt[J],2023,50(10).
APA	Xu, Wei.,Weinberg, Roberto F. F..,Tian, Shi-Hong.,Hou, Zeng-Qian.,Yang, Zhu-Sen.,...&Lai, Feng.(2023).K-Rich Adakite-Like Rocks in Central Tibet: Fractional Crystallization of a Hydrous, Alkaline Primitive Melt.GEOPHYSICAL RESEARCH LETTERS,50(10).
MLA	Xu, Wei,et al."K-Rich Adakite-Like Rocks in Central Tibet: Fractional Crystallization of a Hydrous, Alkaline Primitive Melt".GEOPHYSICAL RESEARCH LETTERS 50.10(2023).