Melt-Fluxed Melting of the Heterogeneously Mixed Lower Arc Crust: A Case Study from the Qinling Orogenic Belt, Central China

doi:10.1029/2017GC007395

QIBEBT-IR

	Melt-Fluxed Melting of the Heterogeneously Mixed Lower Arc Crust: A Case Study from the Qinling Orogenic Belt, Central China
	Wu, Kai 1,2; Ling, Ming-Xing 3,4; Hu, Yong-Bin 1; Guo, Jia 1,2; Jiang, Xiao-Yan 1; Sun, Sai-Jun 1; Liang, Hua-Ying 1; Liu, Xu 5; Sun, Weidong 2,4,6,7
	2018-06-01
发表期刊	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
ISSN	1525-2027
卷号	19 期号:6 页码:1767-1788
摘要	Adakitic rocks with high MgO content and lower crust affinity at convergent margins provide important constraints on arc crust evolution and regional tectonics. An integrated study on the only adakitic pluton with high MgO content and its mafic microgranular enclaves (MMEs) in the Early Paleozoic North Qinling arc terrane was conducted in this paper. Zircons from 2 host rock samples yielded identical weighted mean ages of 428 Ma. The MMEs contain two types of zircons: type 1 zircons share similar morphology, chemical composition, and indistinguishable age with those from the host rock; type 2 zircons yielded an older age of 450 Ma. The similarity in zircon Hf isotopic composition for these zircons indicates a cognate origin of the MMEs. However, the lower Ce4+/Ce3+, higher crystallization temperature and the LREE overabundance of type 2 zircons indicate that mafic intrusions in the lower arc crust were subjected to a post-magmatic event at similar to 450 Ma. Samples from the Tangzang pluton are characterized by typical adakitic geochemical features, and high MgO (Mg#: 50-52), Cr, Ni, and Ba contents. Considering their similar isotopic compositions with the Neoproterozoic metabasites in the North Qinling terrane, we argue that the Tangzang pluton was generated by crustal anatexis of two sources with contributions from the metasomatized mantle wedge. The mantle connection was achieved by aqueous melt-fluxed melting of a "hot zone'' in the lower arc crust. This implies that andesitic continental crust with Mg# of similar to 0.5 may also be associated with fluxed-melting of the lower arc crust.
DOI	10.1029/2017GC007395
关键词[WOS]	LA-ICP-MS ; PORPHYRY COPPER-DEPOSITS ; LOWER CONTINENTAL-CRUST ; LACHLAN FOLD BELT ; HF-O ISOTOPES ; ZIRCON U-PB ; TECTONIC EVOLUTION ; NORTH CHINA ; SOUTH CHINA ; ISLAND-ARC
语种	英语
资助项目	National Key R&D Program of China[2017YFC0602301] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18020102] ; Guangdong Natural Science Funds[2014A030306032] ; Guangdong Natural Science Funds[2015TQ01Z611] ; Youth Innovation Promotion Association CAS[2016315] ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences ; Sino Shaanxi Nuclear Industry Group
WOS研究方向	Geochemistry & Geophysics
项目资助者	National Key R&D Program of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Guangdong Natural Science Funds ; Youth Innovation Promotion Association CAS ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences ; Sino Shaanxi Nuclear Industry Group
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000445194000004
出版者	AMER GEOPHYSICAL UNION
引用统计
文献类型	期刊论文
条目标识符	http://ir.qibebt.ac.cn/handle/337004/11716
专题	中国科学院青岛生物能源与过程研究所
通讯作者	Ling, Ming-Xing
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou, Guangdong, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Guangdong, Peoples R China 4.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China 5.Sino Shaanxi Nucl Ind Grp, Geol Team 211, Xian, Shaanxi, Peoples R China 6.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanog, Qingdao, Peoples R China 7.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Wu, Kai,Ling, Ming-Xing,Hu, Yong-Bin,et al. Melt-Fluxed Melting of the Heterogeneously Mixed Lower Arc Crust: A Case Study from the Qinling Orogenic Belt, Central China[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2018,19(6):1767-1788.
APA	Wu, Kai.,Ling, Ming-Xing.,Hu, Yong-Bin.,Guo, Jia.,Jiang, Xiao-Yan.,...&Sun, Weidong.(2018).Melt-Fluxed Melting of the Heterogeneously Mixed Lower Arc Crust: A Case Study from the Qinling Orogenic Belt, Central China.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,19(6),1767-1788.
MLA	Wu, Kai,et al."Melt-Fluxed Melting of the Heterogeneously Mixed Lower Arc Crust: A Case Study from the Qinling Orogenic Belt, Central China".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 19.6(2018):1767-1788.