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DOI	10.1016/j.lithos.2018.04.026
	Sequence and petrogenesis of the Jurassic volcanic rocks (Yeba Formation) in the Gangdese arc, southern Tibet: Implications for the Neo-Tethyan subduction
	Liu, Zhi-Chao; Ding, Lin; Zhang, Li-Yun; Wang, Chao; Qiu, Zhi-Li; Wang, Jian-Gang; Shen, Xiao-Li; Deng, Xiao-Qin
通讯作者	Liu, ZC (通讯作者)
发表日期	2018
ISSN	0024-4937
EISSN	1872-6143
起始页码	72
结束页码	88
卷号	312
英文摘要	The Yeba Formation volcanic rocks in the Gangdese arc recorded important information regarding the early history of the Neo-Tethyan subduction. To explore their magmatic evolution and tectonic significance, we performed a systematic petrological, geochronological and geochemical study on these volcanic rocks. Our data indicated that the Yeba Formation documents a transition from andesite-dominated volcanism (which started before 182 Ma and continued until similar to 176 Ma) to bimodal volcanism (similar to 174-168 Ma) in the earliest Middle Jurassic. The early-stage andesite-dominated volcanics are characterized by various features of major and trace elements and are interpreted as the products of interactions between mantle-derived arc magmas and lower crustal melts. Their positive epsilon(Nd)(t) and epsilon(Hf)(t) values suggest a significant contribution of asthenosphere-like mantle. The late-stage bimodal volcanism is dominated by felsic rocks with subordinate basalts. Geochemical signatures of the basalts indicate a composite magma source that included a subduction component, an asthenosphere-like upper mantle domain and an ancient subcontinental lithospheric mantle component. The felsic rocks of the late stage were produced mainly by the melting of juvenile crust, with some ancient crustal materials also involved. We suggest that the occurrence and preservation of the Yeba Formation volcanic rocks were tied to a tectonic switch from contraction to extension in the Gangdese arc, which probably resulted from slab rollback of the subducting Neo-Tethyan oceanic slab during the Jurassic. (C) 2018 Published by Elsevier B.V.
关键词	ZIRCON U-PB LHASA TERRANE IMPLICATIONS HF ISOTOPIC CONSTRAINTS NEO-TETHYS LU-HF CONTINENTAL-CRUST INTRAOCEANIC ARC ZEDONG TERRANE TRACE-ELEMENT EVOLUTION
英文关键词	Neo-Tethyan subduction; Gangdese arc; Jurassic magmatism; Volcanic sequence; Extension; Southern Tibet
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:000437064600005
来源期刊	LITHOS
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/259205
推荐引用方式 GB/T 7714	Liu, Zhi-Chao,Ding, Lin,Zhang, Li-Yun,et al. Sequence and petrogenesis of the Jurassic volcanic rocks (Yeba Formation) in the Gangdese arc, southern Tibet: Implications for the Neo-Tethyan subduction[J]. 中国科学院青藏高原研究所,2018,312.
APA	Liu, Zhi-Chao.,Ding, Lin.,Zhang, Li-Yun.,Wang, Chao.,Qiu, Zhi-Li.,...&Deng, Xiao-Qin.(2018).Sequence and petrogenesis of the Jurassic volcanic rocks (Yeba Formation) in the Gangdese arc, southern Tibet: Implications for the Neo-Tethyan subduction.LITHOS,312.
MLA	Liu, Zhi-Chao,et al."Sequence and petrogenesis of the Jurassic volcanic rocks (Yeba Formation) in the Gangdese arc, southern Tibet: Implications for the Neo-Tethyan subduction".LITHOS 312(2018).