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Information Journal Paper

Title

SOGHAN COMPLEX AS AN EVIDENCE FOR PALEOSPREADING CENTER AND MANTLE DIAPIRISM IN SANANDAJ-SIRJAN ZONE (SOUTH-EAST IRAN)

Pages

  157-172

Abstract

 Soghan complex is one of the major ultramafic-mafic complexes in south-east Iran (Esfandagheh area). Lower part of this complex is composed of dunite, harzburgite and chromitite. The lower part is transitionally converted to lherzoite, dunite, pyroxenite and wehrlite (transition zone). These units are transitionally changed into layered gabbros. This sequence is overlained by the metamorphosed Sargaz-Abshur complexes (Marble and Amphibolites) and has been invaded by an isotropic gabbro in Upper Triassic-lower Jurassic period. The last magmatic phase in this complex is characterised by Cretaceous diabasic dykes. Dunites and harzburgites have coarse granular texture with evidence of grain boundary migration and annealing. In these rocks, there are two generations of minerals; the first generation is completely deformed but the second one is nondeformed which have been probably recrystallized from ascending melts. Soghan peridotites have a weak lattice preferred orientation similar to the mantle peridotites. Layered gabbros have typical cumulate textures and phase layering. There are various shapes of minerals with different chemical composition in Soghan complex. The whole chemical composition of Soghan chromitites in particular TiO2 and Cr2O3 contents are similar to boninitic chromites. However, disseminated chromospinels of harzburgites plot in the field of refractory depleted chromospinels. Geothermometric estimations on orthopyroxene-clinopyroxene and olivine-spinel in the complex show subsolidous equilibrium temperatures ranging from 800-950°C. Based on the petrogeochemical data, Soghan harzburgites have been formed by partial melting of subcontinental lherzolites with minor percolation of later melts. The absence of pillow lavas and tectonites, combined with textures, mineral chemistry and whole rock chemistry indicate this complex is likely a part of mantle diapir. Paleorifting of aborted types in Paleozoic, caused lherzolitic diapirism in this area. At the first stage, the diapir is partially melted and resulting melts form transition zone and layered gabbros. In later stages of partial melting, ultramafic sills and isotropic gabbro were formed and move upward. These could have reacted with host peridotites and formed chromite bearing dunites. It is probable that in early Kimmerian orogenic phase, the whole sequence was metamorphosed up to amphibolite facies.

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    APA: Copy

    AHMADIPOUR, H., SABZEHEI, M., EMAMI, M.H., WHITECHURCH, H., & RASTAD, E.. (2003). SOGHAN COMPLEX AS AN EVIDENCE FOR PALEOSPREADING CENTER AND MANTLE DIAPIRISM IN SANANDAJ-SIRJAN ZONE (SOUTH-EAST IRAN). JOURNAL OF SCIENCES ISLAMIC REPUBLIC OF IRAN, 14(2), 157-172. SID. https://sid.ir/paper/532064/en

    Vancouver: Copy

    AHMADIPOUR H., SABZEHEI M., EMAMI M.H., WHITECHURCH H., RASTAD E.. SOGHAN COMPLEX AS AN EVIDENCE FOR PALEOSPREADING CENTER AND MANTLE DIAPIRISM IN SANANDAJ-SIRJAN ZONE (SOUTH-EAST IRAN). JOURNAL OF SCIENCES ISLAMIC REPUBLIC OF IRAN[Internet]. 2003;14(2):157-172. Available from: https://sid.ir/paper/532064/en

    IEEE: Copy

    H. AHMADIPOUR, M. SABZEHEI, M.H. EMAMI, H. WHITECHURCH, and E. RASTAD, “SOGHAN COMPLEX AS AN EVIDENCE FOR PALEOSPREADING CENTER AND MANTLE DIAPIRISM IN SANANDAJ-SIRJAN ZONE (SOUTH-EAST IRAN),” JOURNAL OF SCIENCES ISLAMIC REPUBLIC OF IRAN, vol. 14, no. 2, pp. 157–172, 2003, [Online]. Available: https://sid.ir/paper/532064/en

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