气候变化领域集成服务门户(CCPortal): Recognizing different types of ocean plate stratigraphy in the southeastern South Qilian Accretionary Belt, northeastern Tibet Plateau

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DOI	10.1144/jgs2023-035
	Recognizing different types of ocean plate stratigraphy in the southeastern South Qilian Accretionary Belt, northeastern Tibet Plateau
	Tao, Lu; Zhang, Hongfei; Gao, Zhong; Lu, Zhuo; Yang, He; Zhang, Liqi
发表日期	2023
ISSN	0016-7649
EISSN	2041-479X
卷号	180 期号:6
英文摘要	Dissection of relicts of ocean plate stratigraphy (OPS) in orogens could provide important insights into oceanic evolution, orogenic formation and continental growth. Here we describe a study of petrology, geochronology, geochemistry and Sr-Nd isotopes for OPS in the South Qilian Accretionary Belt with the aim of providing new constraints on the evolution of the Proto-Tethys Ocean (PTO). Three types of OPS units were recognized by their differing petrological, geochemical and isotopic features. Type 1 OPS, representing relicts of ocean islands or seamounts, comprises ocean island basalt and gabbro (t = 525 +/- 4 Ma, (Sr-87/Sr-86)(i) = 0.7035-0.7039 and epsilon(Nd)(t) = +3.63 to +4.16) and (siliceous) carbonate rocks. Type 2 OPS, representing fragments of normal oceanic crust, consists of normal mid-ocean ridge basalt (N-MORB) and basaltic andesite ((Sr-87/Sr-86)(i) = 0.7059-0.7063 and epsilon(Nd)(t) = +6.33 to +7.44), chert and siliceous mudstone. Type 3 OPS could be oceanic plateau-derived and comprises enriched (E)-MORB and dolerite ((Sr-87/Sr-86)(i) = 0.7051-0.7064 and epsilon(Nd)(t) = +4.81 to +6.24), carbonate-siliceous mudstone and carbonate rock. These OPS units witnessed evolution of the PTO. Using available studies on regional arc-type magmatism and U-Pb geochronological data for detrital zircon in this study, a model of 'trench jam accompanying subduction flip induced by accretion of the OPS' is put forward.
英文关键词	PRESSURE METAMORPHIC BELT; NW CHINA PETROGENESIS; NORTH QAIDAM OROGEN; ARC VOLCANIC-ROCKS; U-PB AGE; TECTONIC EVOLUTION; WESTERN CHINA; POSTCOLLISIONAL MAGMATISM; NORTHWESTERN CHINA; CONTINENTAL-CRUST
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001098160900001
来源期刊	JOURNAL OF THE GEOLOGICAL SOCIETY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283481
作者单位	China University of Geosciences - Wuhan; China University of Geosciences - Wuhan; Hubei Polytechnic University; West Yunnan University of Applied Sciences; Chinese Academy of Sciences; Xinjiang Institute of Ecology & Geography, CAS; China University of Geosciences - Wuhan
推荐引用方式 GB/T 7714	Tao, Lu,Zhang, Hongfei,Gao, Zhong,et al. Recognizing different types of ocean plate stratigraphy in the southeastern South Qilian Accretionary Belt, northeastern Tibet Plateau[J],2023,180(6).
APA	Tao, Lu,Zhang, Hongfei,Gao, Zhong,Lu, Zhuo,Yang, He,&Zhang, Liqi.(2023).Recognizing different types of ocean plate stratigraphy in the southeastern South Qilian Accretionary Belt, northeastern Tibet Plateau.JOURNAL OF THE GEOLOGICAL SOCIETY,180(6).
MLA	Tao, Lu,et al."Recognizing different types of ocean plate stratigraphy in the southeastern South Qilian Accretionary Belt, northeastern Tibet Plateau".JOURNAL OF THE GEOLOGICAL SOCIETY 180.6(2023).