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Zircon U-Pb, geochemical and isotopic constraints on the age and origin of A- and I-type granites and gabbro-diorites from NW Iran

文献类型：期刊论文

作者Moghadam, Hadi Shafaii2,3,4,5,6; Li, Qiu-Li3; Griffin, William L.4,5; Stern, Robert J.7; Chiaradia, Massimo8; Karsli, Orhan9; Ghorbani, Ghasem2; O'Reilly, S. Y.4,5; Pourmohsen, Mehrdad1
刊名LITHOS
出版日期2020-11-15
卷号374页码:18
ISSN号0024-4937
关键词Granitoids Late cretaceous Subduction initiation Extension Iran
DOI10.1016/j.lithos.2020.105688
英文摘要The continental crust of NW Iran is intruded by Late Cretaceous I-type granites and gabbro-diorites as well as Paleocene A-type granites. SIMS and LA-ICPMS U-Pb analyses of zircons yield ages of 100-92 Ma (Late Cretaceous) for I-type granites and gabbro-diorites and 61-63 Ma (Paleocene) for A-type granites. Late Cretaceous gabbro-diorites (including mafic microgranular enclaves; MMEs) from NW Iran show variably evolved signatures. They show depletion in Nb and Ta on N-MORB-normalized trace-element spider-diagrams and have high Th/Yb ratios, suggesting their precursor magmas were generated in a subduction-related environment. Gabbro-diorites have variable zircon epsilon Hf(t) values of +1.2 to +8, delta O-18 of 6.4 to 7.4 parts per thousand and bulk rock epsilon Nd(t) of -1.4 to similar to +4.9. The geochemical and isotopic data attest to melting of subcontinental lithospheric mantle (SCLM) to generate near-primitive gabbros with radiogenic Nd isotopes (epsilon Nd(t) = similar to +4.9) and high Nb/Ta and Zr/Hf ratios, similar to mantle melts (Nb/Ta similar to 17 and Zr/Hf similar to 38). These mafic melts underwent further fractionation and mixing with crustal melts to generate Late Cretaceous evolved gabbro-diorites. Geochemical data for I-type granites indicate both Nb-Ta negative and positive anomalies along with enrichment in light REEs. These rocks are peraluminous and have variable bulk-rock epsilon Nd(t) (-1.4 to +1.3), zircon epsilon Hf(t) (+2.8 to +10.4) and delta O-18 (4.7-7.3 parts per thousand) values, but radiogenic bulk rock Pb isotopes. The geochemical and isotopic signatures of these granites suggest interaction of mantle-derived mafic magmas (similar to near-primitive Oshnavieh gabbros) with middle-upper crust through assimilation-fractional crystallization (AFC) to produce Late Cretaceous I-type granites. Paleocene A-type granites have distinctive geochemical features compared to I-type granitoids, including enrichment in Nb-Ta, high bulk rock epsilon Nd(t) (+3.3 to +3.9) and zircon epsilon Hf(t) (+5.1 - +9.9) values. Alkaline granites are ferroan; they have low MgO, CaO, Sr, Ba and Eu concentrations and high total Fe2O3, K2O, Na2O, Al2O3, Ga, Zr, Nb-Ta, Th and rare earth element (REE) abundances and Ga/Al ratios. These rocks might be related to fractionation of a melt derived from a sub-continental lithospheric mantle, but which interacted with asthenosphere-derived melts. We suggest that subduction initiation and the resultant slab roll-back caused extreme extension in the overlying Iranian plate, induced convection in the mantle wedge and led to the decompression melting of SCLM. Rising mantle-derived magmas assimilated middle-upper crustal rocks. Fractionating mantle-derived magmas and contamination with crustal components produced evolved gabbro-diorites and I-type granites. In contrast, asthenospheric upwelling during the Paleocene provided heat for melting and interaction with SCLM to generate the precursor melts to the A-type granites. (C) 2020 Published by Elsevier B.V.
WOS关键词A-TYPE GRANITES ; SANANDAJ-SIRJAN ZONE ; SUBDUCTION-RELATED MAGMATISM ; LACHLAN FOLD BELT ; CONTINENTAL COLLISION ; HAFNIUM ISOTOPE ; SUTURE ZONE ; MANTLE ; EVOLUTION ; OPHIOLITE
资助项目National Key Research and Development Program of China[2016YFE0203000] ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI)[2019VCB0013] ; Alexander von Humboldt Foundation ; GEOMAR Helmholtz Centre ; ARC LIEF Grant ; ARC DEST Systemic Infrastructure Grant ; Macquarie University ; NCRIS AuScope and Industry
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER
WOS记录号WOS:000576679300004
资助机构National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Alexander von Humboldt Foundation ; Alexander von Humboldt Foundation ; Alexander von Humboldt Foundation ; Alexander von Humboldt Foundation ; GEOMAR Helmholtz Centre ; GEOMAR Helmholtz Centre ; GEOMAR Helmholtz Centre ; GEOMAR Helmholtz Centre ; ARC LIEF Grant ; ARC LIEF Grant ; ARC LIEF Grant ; ARC LIEF Grant ; ARC DEST Systemic Infrastructure Grant ; ARC DEST Systemic Infrastructure Grant ; ARC DEST Systemic Infrastructure Grant ; ARC DEST Systemic Infrastructure Grant ; Macquarie University ; Macquarie University ; Macquarie University ; Macquarie University ; NCRIS AuScope and Industry ; NCRIS AuScope and Industry ; NCRIS AuScope and Industry ; NCRIS AuScope and Industry ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Alexander von Humboldt Foundation ; Alexander von Humboldt Foundation ; Alexander von Humboldt Foundation ; Alexander von Humboldt Foundation ; GEOMAR Helmholtz Centre ; GEOMAR Helmholtz Centre ; GEOMAR Helmholtz Centre ; GEOMAR Helmholtz Centre ; ARC LIEF Grant ; ARC LIEF Grant ; ARC LIEF Grant ; ARC LIEF Grant ; ARC DEST Systemic Infrastructure Grant ; ARC DEST Systemic Infrastructure Grant ; ARC DEST Systemic Infrastructure Grant ; ARC DEST Systemic Infrastructure Grant ; Macquarie University ; Macquarie University ; Macquarie University ; Macquarie University ; NCRIS AuScope and Industry ; NCRIS AuScope and Industry ; NCRIS AuScope and Industry ; NCRIS AuScope and Industry ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Alexander von Humboldt Foundation ; Alexander von Humboldt Foundation ; Alexander von Humboldt Foundation ; Alexander von Humboldt Foundation ; GEOMAR Helmholtz Centre ; GEOMAR Helmholtz Centre ; GEOMAR Helmholtz Centre ; GEOMAR Helmholtz Centre ; ARC LIEF Grant ; ARC LIEF Grant ; ARC LIEF Grant ; ARC LIEF Grant ; ARC DEST Systemic Infrastructure Grant ; ARC DEST Systemic Infrastructure Grant ; ARC DEST Systemic Infrastructure Grant ; ARC DEST Systemic Infrastructure Grant ; Macquarie University ; Macquarie University ; Macquarie University ; Macquarie University ; NCRIS AuScope and Industry ; NCRIS AuScope and Industry ; NCRIS AuScope and Industry ; NCRIS AuScope and Industry ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences, President's International Fellowship Initiative (PIFI) ; Alexander von Humboldt Foundation ; Alexander von Humboldt Foundation ; Alexander von Humboldt Foundation ; Alexander von Humboldt Foundation ; GEOMAR Helmholtz Centre ; GEOMAR Helmholtz Centre ; GEOMAR Helmholtz Centre ; GEOMAR Helmholtz Centre ; ARC LIEF Grant ; ARC LIEF Grant ; ARC LIEF Grant ; ARC LIEF Grant ; ARC DEST Systemic Infrastructure Grant ; ARC DEST Systemic Infrastructure Grant ; ARC DEST Systemic Infrastructure Grant ; ARC DEST Systemic Infrastructure Grant ; Macquarie University ; Macquarie University ; Macquarie University ; Macquarie University ; NCRIS AuScope and Industry ; NCRIS AuScope and Industry ; NCRIS AuScope and Industry ; NCRIS AuScope and Industry
源URL[http://ir.iggcas.ac.cn/handle/132A11/98291]  
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Moghadam, Hadi Shafaii; Li, Qiu-Li
作者单位1.Payame Noor Univ PNU, Dept Geol, Tehran, Iran
2.Damghan Univ, Sch Earth Sci, Damghan 3671641167, Iran
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Macquarie Univ, Arc Ctr Excellence Core Crust Fluid Syst, Macquarie Pk, NSW 2109, Australia
5.Macquarie Univ, GEMOC ARC Natl Key Ctr, Dept Earth & Planetary Sci, Macquarie Pk, NSW 2109, Australia
6.Helmholtz Zentrum Ozeanforsch Kiel, GEOMAR, FB4 Dynam Ocean Floor,Wischhofstr 1-3, D-24148 Kiel, Germany
7.Univ Texas Dallas, Geosci Dept, Richardson, TX 75083 USA
8.Univ Geneva, Dept Earth Sci, Geneva, Switzerland
9.Recep Tayyip Erdogan Univ, Dept Geol Engn, TR-53100 Rize, Turkey
推荐引用方式
GB/T 7714		 Moghadam, Hadi Shafaii,Li, Qiu-Li,Griffin, William L.,et al. Zircon U-Pb, geochemical and isotopic constraints on the age and origin of A- and I-type granites and gabbro-diorites from NW Iran[J]. LITHOS,2020,374:18.
APA Moghadam, Hadi Shafaii.,Li, Qiu-Li.,Griffin, William L..,Stern, Robert J..,Chiaradia, Massimo.,...&Pourmohsen, Mehrdad.(2020).Zircon U-Pb, geochemical and isotopic constraints on the age and origin of A- and I-type granites and gabbro-diorites from NW Iran.LITHOS,374,18.
MLA Moghadam, Hadi Shafaii,et al."Zircon U-Pb, geochemical and isotopic constraints on the age and origin of A- and I-type granites and gabbro-diorites from NW Iran".LITHOS 374(2020):18.

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