气候变化领域集成服务门户(CCPortal): The tempo of back-arc basin evolution: Insights from the early Paleozoic Proto-Tethyan North Qilian orogenic belt, northeastern Tibet

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DOI	10.1016/j.epsl.2022.117976
	The tempo of back-arc basin evolution: Insights from the early Paleozoic Proto-Tethyan North Qilian orogenic belt, northeastern Tibet
	Fu, Dong; Huang, Bo; Wilde, Simon A.; Johnson, Tim E.; Polat, Ali; Windley, Brian F.; Hu, Zhaochu; Zhou, Zhipeng; Kusky, Timothy M.
发表日期	2023
ISSN	0012-821X
EISSN	1385-013X
卷号	603
英文摘要	Back-arc basins are pivotal sites for the generation and consumption of oceanic lithosphere in mature intra-oceanic convergent plate margins. However, the processes and mechanisms by which back-arc oceanic basins generate and terminate remain enigmatic. Here we document the life cycle of an extinct Paleozoic back-arc from an ophiolite-accretionary complex in the Proto-Tethyan North Qilian orogenic belt, northeastern Tibet, which records early spreading and subsequent closure through two episodes of subduction. Zircon U-Pb ages of gabbro and plagiogranite indicate two episodes of oceanic crust formation at ca. 480 Ma and ca. 452-448 Ma. Low-Ti gabbro, basalt, and plagiogranite (ca. 480 Ma) from the accretionary complex have back-arc geochemical signatures, whereas ultramafic rocks, gabbro, basalt, and plagiogranite suite from the ophiolite sheet (ca. 452-448 Ma) exhibit forearc characteristics. These data, together with recent structural and metamorphic evidence, indicate that the ophiolitic rocks were derived from both back-arc and forearc settings, and record the magmatic response to early spreading of the North Qilian back-arc basin and subsequent subduction initiation. Early subduction and slab rollback of the North Qilian oceanic lithosphere led to formation of the North Qilian arc and spreading of the back-arc, whereas later subduction initiation of the back-arc oceanic crust resulted in its termination and closure. These findings indicate that the subduction of back-arc oceanic crust is a primary mechanism in the closure of back-arc basins and thereby highlights the complex evolutionary tempo of back-arc basins in Earth history.
关键词	back-arc basin subduction initiation intra-oceanic subduction forearc ophiolite
英文关键词	SUBDUCTION INITIATION; NW CHINA; OCEANIC SUBDUCTION; TRACE-ELEMENTS; MARIANA TROUGH; SUTURE ZONE; BASALTS; OPHIOLITE; ROCKS; ISOTOPES
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:000990995500001
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283278
作者单位	China University of Geosciences - Wuhan; China University of Geosciences - Wuhan; Curtin University; University of Windsor; University of Leicester; China University of Geosciences - Wuhan
推荐引用方式 GB/T 7714	Fu, Dong,Huang, Bo,Wilde, Simon A.,et al. The tempo of back-arc basin evolution: Insights from the early Paleozoic Proto-Tethyan North Qilian orogenic belt, northeastern Tibet[J],2023,603.
APA	Fu, Dong.,Huang, Bo.,Wilde, Simon A..,Johnson, Tim E..,Polat, Ali.,...&Kusky, Timothy M..(2023).The tempo of back-arc basin evolution: Insights from the early Paleozoic Proto-Tethyan North Qilian orogenic belt, northeastern Tibet.EARTH AND PLANETARY SCIENCE LETTERS,603.
MLA	Fu, Dong,et al."The tempo of back-arc basin evolution: Insights from the early Paleozoic Proto-Tethyan North Qilian orogenic belt, northeastern Tibet".EARTH AND PLANETARY SCIENCE LETTERS 603(2023).