Early Paleozoic high-Mg granodiorite from the Erlangping unit, North Qinling orogen, central China: Partial melting of metasomatic mantle during the initial back-arc opening

doi:10.1016/j.lithos.2017.07.016

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	Early Paleozoic high-Mg granodiorite from the Erlangping unit, North Qinling orogen, central China: Partial melting of metasomatic mantle during the initial back-arc opening
	Abdallsamed, Mohammed I. M.1,2; Wu, Yuan-Bao 1; Zhang, Wenxiang 1; Zhou, Guangyan 1; Wang, Hao3 ; Yang, Saihong 3
刊名	LITHOS
	2017-09-01
卷号	288 页码:282-294
关键词	High-Mg granodiorite U-Pb zircon age Metasomatized mantle Back-arc opening The Qinling orogen
ISSN号	0024-4937
DOI	10.1016/j.lithos.2017.07.016
文献子类	Article
英文摘要	This study discussed the petrological classification, petrogenesis, and tectonic significance of early Paleozoic high Mg granodiorite from the Erlangping unit, in the North Qinling orogen. To achieve this target, we conducted integrated investigation of in situ zircon U-Pb dating, whole-rock geochemical, as well as Sr-Nd-Hf-O isotopic compositions for the Kanfenggou pluton from the Erlangping unit. LA-ICP-MS zircon dating for the Kanfenggou samples yields U-Pb ages of 442.9 +/- 6.2.and 438.0 +/- 6.7 Ma, suggesting that the pluton was emplaced at ca. 440 Ma. Whole-rock geochemical compositions of the samples display intermediate SiO2 (60.48-64.67 wt%) and K2O (1.21 to 2.10 wt%), but high Al2O3 (15.44 to 16.51 wt) and Na2O (4.01 to 4.81 wt%) contents. The granodiorite samples are characterized by elevated MgO ranging from 2.30 to 3.44 wt% and Mg# values of 53.35to 56.66, implying they are high-Mg granodiorites. They are characterized by very high Ba (524-1132 ppm) and Sr (684-980 ppm) contents, but depleted in HREE, and high (La/Yb)(N) ratios of 6.34 to 16.5 and slightly negative to weak positive Eu anomalies (Eu/Eu* = 0.68-1.09). These evidence that the Kanfenggou pluton belongs to the sanukitoid series. The high-Mg granodiorite samples exhibit a mantle signature with high Mg# values (53.35-56.66), Cr (45.8 to 93.3 ppm) and Ni (282 to 48.2 ppm) contents, but enriched in LILE, pointing to an enriched mantle source. The samples show relatively depleted radiogenic isotopic compositions with initial Sr-87/Sr-86 ratios varying from 0.7044 to 0.7047, epsilon(Nd)(t) values from 0.31 to 421, and zircon epsilon(Hf) (t) values from 7.3 to 83. The zircons have a mean delta O-18 value of 5.20 +/- 0.17 parts per thousand. Based on the trace element geochemical features, the metasomatic agent was suggested to be the fluids generated from dehydration of subducted slab. Therefore, we suggest two-stage processes for the formation of the Erlangping high-Mg granodiorites: (1) interaction between slab fluids and mantle peridotite; (2) partial melting of metasomatized mantle peridotite caused by the asthenosphere mantle upwelling and the initial back-arc opening resulted from the oceanic slab rollback. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词	SETOUCHI VOLCANIC BELT ; U-PB AGE ; HIGH-MAGNESIAN ANDESITES ; WESTERN DABIE MOUNTAINS ; OXYGEN-ISOTOPE RATIOS ; HIGH-PRESSURE ROCKS ; HF-O ISOTOPES ; CONTINENTAL-CRUST ; TRACE-ELEMENT ; SUBDUCTION ZONES
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000411546000017
资助机构	Ministry of Science and Technology of China(2017YFC0602401 ; National Natural Science Foundation of China(41625008 ; 2015CB856106) ; 41573047 ; 41273035) ; Ministry of Science and Technology of China(2017YFC0602401 ; National Natural Science Foundation of China(41625008 ; 2015CB856106) ; 41573047 ; 41273035) ; Ministry of Science and Technology of China(2017YFC0602401 ; National Natural Science Foundation of China(41625008 ; 2015CB856106) ; 41573047 ; 41273035) ; Ministry of Science and Technology of China(2017YFC0602401 ; National Natural Science Foundation of China(41625008 ; 2015CB856106) ; 41573047 ; 41273035)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/61965]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Wu, Yuan-Bao
作者单位	1.China Univ Geosci, Fac Earth Sci, State Key Lab Geol Processes & Mineral Resources, Wuhan 430074, Hubei, Peoples R China 2.Univ Kordofan, Fac Sci, Dept Geol, B160, Elobeid 51111, Sudan 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Abdallsamed, Mohammed I. M.,Wu, Yuan-Bao,Zhang, Wenxiang,et al. Early Paleozoic high-Mg granodiorite from the Erlangping unit, North Qinling orogen, central China: Partial melting of metasomatic mantle during the initial back-arc opening[J]. LITHOS,2017,288:282-294.
APA	Abdallsamed, Mohammed I. M.,Wu, Yuan-Bao,Zhang, Wenxiang,Zhou, Guangyan,Wang, Hao,&Yang, Saihong.(2017).Early Paleozoic high-Mg granodiorite from the Erlangping unit, North Qinling orogen, central China: Partial melting of metasomatic mantle during the initial back-arc opening.LITHOS,288,282-294.
MLA	Abdallsamed, Mohammed I. M.,et al."Early Paleozoic high-Mg granodiorite from the Erlangping unit, North Qinling orogen, central China: Partial melting of metasomatic mantle during the initial back-arc opening".LITHOS 288(2017):282-294.