Identification of the Late Devonian back-arc magmatism in the Chinese Eastern Tianshan

doi:10.1016/j.lithos.2023.107283

	Du, Long 1,2; Long, Xiaoping 2; Yuan, Chao3 ; Zhang, Yunying 4; Huang, Zongying 3; Zhu, Hongli 5
	Identification of the Late Devonian back-arc magmatism in the Chinese Eastern Tianshan
Source Publication	LITHOS
ISSN	0024-4937
	2023-10-01
Volume	454 Pages:14
DOI	10.1016/j.lithos.2023.107283
Language	英语
WOS Research Area	Geochemistry & Geophysics ; Mineralogy
Abstract	Identifcation of subduction to back-arc tectonic transitions is critical to the study of accretionary orogens. Some new geochronological and geochemical data for the Late Devonian (380-361 Ma) Kezier mafic-felsic complex and Tuwu granitic pluton in this study have well recorded such transition feature in the Chinese Eastern Tianshan orogen. The Kezier gabbro is classified as high-Al basalt given their high Al contents (A12O3 > 17 wt%). They were originated from a depleted mantle fluxed by fertile mantle components at shallow depths under hydrous condition. Both the Kezier and Tuwu granites show geochemical characteristics of high total alkali, Ga/Al, HFSE, low CaO, and strongly negative Ba, Sr, and Eu anomalies, demonstrating a close affinity with A-type granites. The granites were probably generated by high temperature melting (zircon saturation temperature up to 916 degrees C) of crustal rocks under a low-pressure (<0.8-1.0 GPa) condition. These rocks can help identify the Late Devonian back-arc extensional event in the Eastern Tianshan. This extensional event contemporaneous with the onset of the earliest arc magmatic records southward rejuvenating. The back-arc extensional with crustal high-temperature melting event can be reconciled with the Kangguer Ocean rollback, which forced the arc rifting occur on the Dananhu fore-arc side during the Late Devonian.
Keyword	Accretionary orogen Eastern Tianshan Back-arc High -Al gabbro A-type granite
WOS ID	WOS:001045762200001
Indexed By	SCI
Citation statistics	Cited Times:2[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.gig.ac.cn/handle/344008/74629
Collection	同位素地球化学国家重点实验室
Corresponding Author	Du, Long
Affiliation	1.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Res Ctr Continental Dynam, Qingdao 266590, Peoples R China 2.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 4.Chinese Acad Sci, South China Sea Inst Oceanol, Innovat Acad South China Sea Ecol & Environm Engn, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China 5.Chinese Acad Sci, Inst Oceanog, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
Recommended Citation GB/T 7714	Du, Long,Long, Xiaoping,Yuan, Chao,et al. Identification of the Late Devonian back-arc magmatism in the Chinese Eastern Tianshan[J]. LITHOS,2023,454:14.
APA	Du, Long,Long, Xiaoping,Yuan, Chao,Zhang, Yunying,Huang, Zongying,&Zhu, Hongli.(2023).Identification of the Late Devonian back-arc magmatism in the Chinese Eastern Tianshan.LITHOS,454,14.
MLA	Du, Long,et al."Identification of the Late Devonian back-arc magmatism in the Chinese Eastern Tianshan".LITHOS 454(2023):14.

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