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Petrography, geochemistry, and U–Pb geochronology of pegmatites and aplites associated with the Alvand intrusive complex in the Hamedan region, Sanandaj–Sirjan zone, Zagros orogen (Iran)

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Abstract

The Alvand intrusive complex in the Hamedan area in Iran is in the Sanandaj–Sirjan zone of the Zagros orogen. It consists of a wide range of plutonic rocks, mainly gabbro, diorite, granodiorite, granite, and leucogranites that were intruded by aplitic and pegmatitic dykes. At least three successive magmatic episodes generated an older gabbro–diorite–tonalite assemblage, followed by a voluminous granodiorite–granite association, which was then followed by minor leucocratic granitoids. Aplitic and pegmatitic dykes and bodies have truncated both plutonic rocks of the Alvand intrusive complex and its metamorphic aureole. Chemically they belong to peraluminous LCT (Li-, Cs-, and Ta-bearing) family of pegmatites. Mineralogically, they resemble Muscovite (MS) and Muscovite Rare Element (MSREL) classes of pegmatites. High amounts of some elements, such as Sn (up to 10,000 ppm), Rb (up to 936 ppm), Ba (up to 706 ppm), and LREE (up to 404 ppm) indicate the highly fractionated nature of some of these aplites and pegmatites. U–Pb dating of monazite, zircon, and allanite by LA-ICPMS indicate the following ages: monazite-bearing aplites of Heydareh-e-Poshteshahr and Barfejin areas, southwest of Hamedan, give an age range of 162–172 Ma; zircon in Heydareh-e-Poshteshar gives an average age of ~165 Ma and for allanite-bearing pegmatites of Artiman area, north of Tuyserkan, an age of 154.1 ± 3.7 Ma was determined. These overlap with previously reported ages (ca. 167–153 Ma) for the plutonic rocks of the Alvand complex. Therefore, these data reveal that the Jurassic was a period of magmatism in the Hamedan region and adjacent areas in the Sanandaj–Sirjan zone, which was situated at the southern edge of the central Iranian micro-plate (southern Eurasian plate) at this time. Our results also suggest that advective heating in a continental arc setting has caused melting of fertile supracrustal lithologies, such as meta-pelites. These partial melts were then emplaced at much higher crustal levels, but within a thermally anomalous environment, which, therefore, leads to formation of evolved felsic rocks, such as the studied LCT aplite–pegmatite suite and their parental granitic rocks. This is a new result that indicates the role of syn-subduction crustal partial melting in the region as part of Zagros orogeny.

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Fig. 1

(Modified after Mohajjel et al. 2003)

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(Modified from Ahmadi-Khalaji et al. 2007)

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Acknowledgements

David Lentz and Christopher McFarlane are each supported by a NSERC Discovery grant. We thank research office of Bu-Ali Sina University for providing part of the budget for geochemicaland microprobe analyses of this study.

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Authors and Affiliations

  1. Department of Geology, Bu Ali Sina University, Mehdieh Street, Hamedan, Iran

    Ali Asghar Sepahi, Sedigheh Salami & Mohammad Maanijou

  2. Department of Earth Sciences, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada

    David Lentz & Christopher McFarlane

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  1. Ali Asghar Sepahi
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  2. Sedigheh Salami
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Sepahi, A.A., Salami, S., Lentz, D. et al. Petrography, geochemistry, and U–Pb geochronology of pegmatites and aplites associated with the Alvand intrusive complex in the Hamedan region, Sanandaj–Sirjan zone, Zagros orogen (Iran). Int J Earth Sci (Geol Rundsch) 107, 1059–1096 (2018). https://doi.org/10.1007/s00531-017-1515-4

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