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DOI	10.1130/B36847.1
	Coexisting Nb-enriched basalts and arc volcanic rocks in the northern Qiangtang Terrane, China: Implications for the effects of ambient mantle on subduction zone magmatism
	Zhang, Ze; Chen, Sheng-Sheng; Sun, Da -Wei; Gao, Sen
发表日期	2024
ISSN	0016-7606
EISSN	1943-2674
起始页码	136
结束页码	5-6
卷号	136 期号:5-6
英文摘要	The petrogenesis of Nb-enriched basalts (NEBs) is controversial. NEBs are generally considered to form by melting of either a mixed enriched and depleted mantle source or a mantle wedge metasomatized by adakitic melts. Here we present geochronological, petrological, geochemical, and Sr-Nd-Os isotope data for Early Permian volcanic rocks from the Tuotuohe area in the northern Qiangtang Terrane, China. The studied volcanic rocks can be divided into two groups: arc basalts and basaltic andesites in the lower sequence and NEBs in the upper sequence. Zircon grains from one basaltic andesite sample in the lower sequence yielded a concordia age of 302.0 +/- 1.1 Ma. The geochemical and isotopic characteristics suggest that the NEBs were derived from a mixed source consisting of enriched mid -oceanic ridge basalts (MORB)- to oceanic -island basalt -like ambient mantle and slab -derived fluids, whereas the arc basalts and basaltic andesites originated from a source made of the MORB-type ambient mantle modified by slab -derived melts. We propose for the first time that the Nb enrichment of the NEBs was most likely inherited from high-Nb ambient mantle and is independent of the addition of slab -derived components. In addition to slab -derived components, the nature of the ambient mantle is also an important factor controlling the diversity of arc magmatism. Our new findings show that the Late Carboniferous-Early Permian magmatism in the northern Qiangtang Terrane was related to northward subduction of the Paleo-Tethys Ocean, suggest ing that subduction might have occurred in at least the Early Permian rather than in the previously thought Middle Permian.
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001234721200004
来源期刊	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303597
作者单位	China University of Geosciences; China University of Geosciences; Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
推荐引用方式 GB/T 7714	Zhang, Ze,Chen, Sheng-Sheng,Sun, Da -Wei,et al. Coexisting Nb-enriched basalts and arc volcanic rocks in the northern Qiangtang Terrane, China: Implications for the effects of ambient mantle on subduction zone magmatism[J]. 中国科学院青藏高原研究所,2024,136(5-6).
APA	Zhang, Ze,Chen, Sheng-Sheng,Sun, Da -Wei,&Gao, Sen.(2024).Coexisting Nb-enriched basalts and arc volcanic rocks in the northern Qiangtang Terrane, China: Implications for the effects of ambient mantle on subduction zone magmatism.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,136(5-6).
MLA	Zhang, Ze,et al."Coexisting Nb-enriched basalts and arc volcanic rocks in the northern Qiangtang Terrane, China: Implications for the effects of ambient mantle on subduction zone magmatism".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 136.5-6(2024).