Revisiting Early-Middle Jurassic igneous activity in the Nanling;Mountains, South China: Geochemistry and implications for regional;geodynamics

doi:10.1016/j.jseaes.2012.07.010

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	Revisiting Early-Middle Jurassic igneous activity in the Nanling;Mountains, South China: Geochemistry and implications for regional;geodynamics
	Ye, Hai-Min 7; Mao, Jian-Ren ; Zhao, Xi-Lin ; Liu, Kai ; Chen, Dan-Dan
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2013
卷号	72;SI SI 页码:108-117
关键词	Early-Middle Jurassic igneous rocks Nanling Mountains Geochemistry Geodynamic implications
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2012.07.010
英文摘要	Early-Middle Jurassic igneous rocks (190-170 Ma) are distributed in an E-W-trending band within the Nanling Tectonic Belt, and have a wide range of compositions but are only present in limited volumes. This scenario contrasts with the uniform but voluminous Middle-Late Jurassic igneous rocks (165-150 Ma) in this area. The Early-Middle Jurassic rocks include oceanic-island basalt (OIB)-type alkali basalts, tholeiitic basalts and gabbros, bimodal volcanic rocks, syenites, A-type granites, and high-K calc-alkaline granodiorites. Geochemical and isotopic data indicate that alkaline and tholeiitic basalts and syenites were derived from melting of the asthenospheric mantle, with asthenosphere-derived magmas mixing with variable amounts of magmas derived from melting of metasomatized lithospheric mantle. In comparison, A-type granites in the study area were probably generated by shallow dehydration-related melting of hornblende-bearing continental crustal rocks that were heated by contemporaneous intrusion of mantle-derived basaltic magmas, and high-K calc-alkaline granodiorites resulted from the interaction between melts from upwelling asthenospheric mantle and the lower crust. The Early-Middle Jurassic magmatic event is spatially variable in terms of lithology, geochemistry, and isotopic systematics. This indicates that the deep mantle sources of the magmas that formed these igneous rocks were significantly heterogeneous, and magmatism had a gradual decrease in the involvement of the asthenospheric mantle from west to east. These variations in composition and sourcing of magmas, in addition to the spatial distribution and the thermal structure of the crust-mantle boundary during this magmatic event, indicates that these igneous rocks formed during a period of rifting after the Indosinian Orogeny rather than during subduction of the paleo-Pacific oceanic crust. (c) 2012 Elsevier Ltd. All rights reserved.
学科主题	火成岩岩石学
WOS关键词	A-TYPE GRANITES ; TECTONIC EVOLUTION ; SOUTHEASTERN CHINA ; JIANGXI ; PROVINCE ; PETROGENETIC IMPLICATIONS ; SYENITE-GABBRO ; VOLCANIC-ROCKS ; FOLD BELT ; SE CHINA ; CONSTRAINTS
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000321404900010
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39949]
专题	中国地质调查局南京地质调查中心
作者单位	1.[Ye, Hai-Min 2.Mao, Jian-Ren 3.Zhao, Xi-Lin 4.Liu, Kai 5.Nanjing Inst Geol & Mineral Resources, Nanjing 210016, Jiangsu, Peoples R China. 6.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China. 7.中国地质调查局南京地质调查中心
推荐引用方式 GB/T 7714	Ye, Hai-Min,Mao, Jian-Ren,Zhao, Xi-Lin,et al. Revisiting Early-Middle Jurassic igneous activity in the Nanling;Mountains, South China: Geochemistry and implications for regional;geodynamics[J]. JOURNAL OF ASIAN EARTH SCIENCES,2013,72;SI SI:108-117.
APA	Ye, Hai-Min,Mao, Jian-Ren,Zhao, Xi-Lin,Liu, Kai,&Chen, Dan-Dan.(2013).Revisiting Early-Middle Jurassic igneous activity in the Nanling;Mountains, South China: Geochemistry and implications for regional;geodynamics.JOURNAL OF ASIAN EARTH SCIENCES,72;SI SI,108-117.
MLA	Ye, Hai-Min,et al."Revisiting Early-Middle Jurassic igneous activity in the Nanling;Mountains, South China: Geochemistry and implications for regional;geodynamics".JOURNAL OF ASIAN EARTH SCIENCES 72;SI SI(2013):108-117.