Eocene Kashmar granitoids (NE Iran): Petrogenetic constraints from U-Pb zircon geochronology and isotope geochemistry

doi:10.1016/j.lithos.2014.12.012

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	Eocene Kashmar granitoids (NE Iran): Petrogenetic constraints from U-Pb zircon geochronology and isotope geochemistry
	Moghadam, Hadi Shafaii 1,2; Li, Xian-Hua 2; Ling, Xiao-Xiao 2; Santos, Jose F.3; Stern, Robert J.4; Li, Qiu-Li 2; Ghorbani, Ghasem 2
刊名	LITHOS
	2015-02-01
卷号	216 页码:118-135
关键词	I-type granite U-Pb zircon dating Hf-O isotopes Eocene magmatism Kashmar granitoids
DOI	10.1016/j.lithos.2014.12.012
文献子类	Article
英文摘要	Kashmar granitoids outcrop for similar to 100 km along the south flank of the Sabzevar ophiolite (NE Iran) and consist of granodiorite and monzogranite along with subordinate quartz monzonite, syenogranite and aplitic dikes. These granitoids intruded Early to Middle Eocene high-K volcanic rocks and can spatially be grouped into eastern and western granitoids. Five samples of granite have identical zircon U-Pb ages of ca. 40-41 Ma. The granitoids have quite high K2O (similar to 1.3-53 wt%) and Na2O (similar to 1.1-4.6 wt%) with SiO2 ranging between similar to 62 and 77 wt%. They are metaluminous to peraluminous, calc-alkaline and I-type in composition. Their chondrite-normalized REE patterns are characterized by LREE enrichment and show slight negative Eu anomalies. Kashmar granitoids have low whole rock epsilon Nd (-0.43 to -2.3), zircon sHf values (-1.9 to +7.2), and somewhat elevated delta O-18 (+6.1 to +8.7 parts per thousand) in the range of I-type granites. The Kashmar granitoids show Early Neoproterozoic zircon second-stage Hf and bulk rock Nd model ages at ca. 500-1000 Ma (associated with ca. 640 Ma old inherited zircons). Bulk rock Nd-Sr isotopic modeling suggests that 10-20% assimilation of Cadomian lower crust by juvenile mantle melts and then fractional crystallization (AFC process) can explain the Sr-Nd isotopic compositions of Kashmar granitoids. Kashmar granitoids are products of crustal assimilation by mantle melts associated with extension above the subducting Neotethyan Ocean slab beneath SW Eurasia. Similar subduction-related extension was responsible for the flare-up of Eocene-Oligocene magmatism across Iran, associated with core complex formation in central Iran. (C) 2014 Elsevier B.V. All rights reserved.
WOS关键词	MANTLE WEDGE PLUMES ; TECTONIC EVOLUTION ; HIGH-POTASSIUM ; TRACE-ELEMENT ; SOUTHEASTERN AUSTRALIA ; SUBDUCTED LITHOSPHERE ; GEODYNAMIC EVOLUTION ; OCEANIC LITHOSPHERE ; EUROPEAN VARISCIDES ; SABZEVAR OPHIOLITE
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
WOS记录号	WOS:000353851300009
资助机构	"Strategic Priority Research Program (B)" of the Chinese Academy of Sciences(XDB03010800) ; "Strategic Priority Research Program (B)" of the Chinese Academy of Sciences(XDB03010800) ; "Strategic Priority Research Program (B)" of the Chinese Academy of Sciences(XDB03010800) ; "Strategic Priority Research Program (B)" of the Chinese Academy of Sciences(XDB03010800) ; State Key Laboratory of Lithospheric Evolution, IGG-CAS ; State Key Laboratory of Lithospheric Evolution, IGG-CAS ; State Key Laboratory of Lithospheric Evolution, IGG-CAS ; State Key Laboratory of Lithospheric Evolution, IGG-CAS ; "Strategic Priority Research Program (B)" of the Chinese Academy of Sciences(XDB03010800) ; "Strategic Priority Research Program (B)" of the Chinese Academy of Sciences(XDB03010800) ; "Strategic Priority Research Program (B)" of the Chinese Academy of Sciences(XDB03010800) ; "Strategic Priority Research Program (B)" of the Chinese Academy of Sciences(XDB03010800) ; State Key Laboratory of Lithospheric Evolution, IGG-CAS ; State Key Laboratory of Lithospheric Evolution, IGG-CAS ; State Key Laboratory of Lithospheric Evolution, IGG-CAS ; State Key Laboratory of Lithospheric Evolution, IGG-CAS
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62530]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位	1.Damghan Univ, Sch Earth Sci, Damghan 3671641167, Iran 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.Univ Aveiro, Dept Geociencias, Geobiotec, P-3810193 Aveiro, Portugal 4.Univ Texas Dallas, Dept Geosci, Richardson, TX 75083 USA
推荐引用方式 GB/T 7714	Moghadam, Hadi Shafaii,Li, Xian-Hua,Ling, Xiao-Xiao,et al. Eocene Kashmar granitoids (NE Iran): Petrogenetic constraints from U-Pb zircon geochronology and isotope geochemistry[J]. LITHOS,2015,216:118-135.
APA	Moghadam, Hadi Shafaii.,Li, Xian-Hua.,Ling, Xiao-Xiao.,Santos, Jose F..,Stern, Robert J..,...&Ghorbani, Ghasem.(2015).Eocene Kashmar granitoids (NE Iran): Petrogenetic constraints from U-Pb zircon geochronology and isotope geochemistry.LITHOS,216,118-135.
MLA	Moghadam, Hadi Shafaii,et al."Eocene Kashmar granitoids (NE Iran): Petrogenetic constraints from U-Pb zircon geochronology and isotope geochemistry".LITHOS 216(2015):118-135.