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Petrogenesis and tectonic implications of Late Carboniferous A-type granites and gabbronorites in NW Iran:Geochronological and geochemical constraints

Petrogenesis and tectonic implications of Late Carboniferous...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： hadi shafaii moghadam Xian-Hua Li Xiao-Xiao Ling Robert J.Stern Jose F.Santos Guido Meinhold Ghasem Ghorbani Shirin Shahabi State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences School of Earth Sciences Damghan University Geosciences Dept. University of TX at Dallas Geobiotec Departamento de GeociênciasUniversidade de Aveiro Geowissenschaftliches Zentrum der Universit?t G?ttingen

Carboniferous igneous rocks constitute volumetrically minor components of Iranian crust but preserve important information about the magmatic and tectonic history of SW *** granites and gabbronorites in NW Iran comprise a bimodal magmatic suite that intruded Ediacaran–Cambrian gneiss and are good representatives of carboniferous igneous *** SIMS U–Pb zircon ages indicate that the gabbronorites and granites were emplaced synchronously at20 *** granites show A-type magmatic affinities,with typical enrichments in alkalis,Ga,Zr,Nb and Y,depletion in Sr and P and fractionated REE patterns showing strong negative Eu *** gabbronorites are enriched in LREEs,Nb,Ta and other incompatible trace elements,and are similar in geochemistry to OIB-type *** and gabbronorites have similarεNd(t)(+1.3 to+3.4 and-0.1 to+4.4,respectively)and zirconεHf(t)(+1.7 to+6.2 and+0.94 to+6.5,respectively).The similar variation in bulk rockεNd(t)and zirconεHf(t)values and radiometric ages for the granites and gabbronorites indicate a genetic relationship between mafic and felsic magmas,either a crystal fractionation or silicate liquid immiscibility process;further work is needed to resolve petrogenetic *** compositional characteristics of the bimodal Ghushchi complex are most consistent with magmatic activity in an extensional tectonic *** extension may have occurred during rifting of Cadomian fragments away from northern Gondwana during early phases of Neotethys opening.

关键词： A-type granite Gabbronorite Carboniferous Zircon U–Pb ages Iran

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Devonian to Permian evolution of the Paleo-Tethys Ocean:New evidence from U–Pb zircon dating and Sr–Nd–Pb isotopes of the Darrehanjir–Mashhad “ophiolites”,NE Iran

Devonian to Permian evolution of the Paleo-Tethys Ocean:New ...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： hadi shafaii moghadam Xian-Hua Li Xiao-Xiao Ling Robert J.Stern Mohamed Zaki Khedr Massimo Chiaradia Ghasem Ghorbani Shoji Arai Akihiro Tamura State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences School of Earth Sciences Damghan University Geosciences Dept. University of Texas at Dallas Department of Earth Sciences Kanazawa University Department of Geology Faculty of ScienceKafrelsheikh University Département de Minéralogie Université de Genève

Middle to Late Paleozoic ophiolites,which are remnants of the Paleo-Tethys Ocean,are aligned in two main zones in northern Iran:Darrehanjir-Fariman-Mashhad,and Rasht in the north and Jandagh-Anarak ophiolites to the *** new U-Pb zircon dating results show that the-200 km long Darrehanjir-Mashhad mafic-ultramafic body is not a single ophiolite but a composite igneous complex composed of Permian pillow lavas and pelagic sediments in fault contact with a small outcrop of Devonian intrusive and ultramafic *** intrusive rocks have U-Pb zircon ages of 380.6±3.7 Ma and 382.9±3.7 Ma respectively,-100 Ma older than published ages for gabbros and radiolarites intercalated with lavas near Mashhad and *** peridotites from the Devonian complex contain low Cr#spinel,similar to that in MORB-type *** Darrehanjir gabbros and Permian Mashhad sequences both have boninitic and calc-alkaline signatures,***δOvalues from the Devonian ferrodiorite(δO-4.6±0.3‰)are slightly lower than the 5.2 to5.4‰expected for MORB-type zircons whereas Devonian plagiogranitic zircons mostly haveδO103)and lowεNd(<5.4)for both Permian and Devonian *** Darrehanjir-Mashhad rocks are characterized by radiogenicPb/Pb andPb/Pb,indicating the involvement of subducted terrigenous sediments in the *** Mashhad-Darrehanjir mafic-ultramafic complex demonstrates that this part of Paleo-Tethys evolved from oceanic crust formation above a subduction zone in Devonian time to accretionary convergence in Permian *** Paleozoic ophiolites and oceanic igneous complexes along with those of the Caucasus and Turkey in the west and Afghanistan,Turkmenistan

关键词： Paleozoic ophiolites U–Pb zircon dating Zircon εHf(t) Komatiite Supra-subduction zone-type magmatism

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