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Petrogenesis of the Darvazeh mafic-intermediate intrusive bodies, Qorveh, Sanandaj-Sirjanzone, Iran

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Abstract

The Darvazeh intrusion in the northern Sanandaj-Sirjan zone in the Alpine-Himalayan orogenic belt is composed of olivine gabbro, gabbroic diorite and granitoid units that intruded Jurassic metamorphic rocks. Field relations, textures, and whole rock geochemistry indicate that most of the mafic to intermediate composition rocks are not cumulates and instead represent liquid compositions. The tholeiitic (or ferroan) gabbros and magnesian gabbroic diorites evolved along liquid lines of descent and have different parental magmas. This conclusion is based on separate trends, often with overlapping MgO contents, for Si, Fe, Ti, Ni, Cr, Zn, Cu and Sr. The mineralogy (late versus early magnetite and contrasting proportions of magmatic amphibole) of the two suites are also slightly different as is the trace element patterns (for example Th, U, Ti and Sr). The Mg# of mafic-intermediate rocks ranges from 46 to 73, implying that the ultimate source for the most mafic rocks was in the mantle, not the crust. Flat HREE patterns, Sm/Yb ratios (<2) show that melting occurred in the shallow mantle, above the stability field of garnet. Small negative Nb-Ta-Ti anomalies and enrichments of Cs, Rb, Pb, Pb, and Sr on mantle-normalized trace element diagrams are consistent with a subduction zone source for both the tholeiitic gabbros and the magnesian gabbroic diorites. Hence, we conclude that the parental mafic magmas were generated by partial melting of spinel peridotite in the mantle wedge above a subducting slab of oceanic lithosphere. However, the composition of plagioclase-olivine pairs suggest the gabbroic magmas were not water-rich, and their high Fe/Mg and Ti/V ratios show they were relatively reduced compared to typical arc magmas. For the gabbros, melting may have been initiated by decompression in an intra-arc extensional environment caused by slab roll back or oblique subduction that partially separated the Sanandaj-Sirjan zone from the Central Iran block. Components from the subduction fluid are smaller than in the subsequent gabbroic diorites which have more typical arc compositions. These mafic magmas rose and fractionated on different paths controlled by water content and fO2, with the gabbros following reduced Fe-enrichment trends and the magnesian gabbroic diorites following more oxidized trends. The country rocks, plate reconstructions, and trace element systematics (including high Th/La ratios) show that the arc was underlain by continental crust that was assimilated into the mafic and intermediate magmas. Thus, the Darvazeh pluton reveals the complex nature of mafic intrusive rocks, which formed in a continental arc experiencing extension as the Neo-Tethys oceanic lithosphere subducted beneath the Central Iranian plate.

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Acknowledgments

Financial support from the Bu-Ali Sina University and Brigham Young University (BYU) are acknowledged. The diligence of Shane Dailey, Danielle Spencer, and Phillip Cammans in the geochemistry laboratories at BYU also contributed to this project. Instrumentation grants from the U.S. National Science Foundation (EAR-0923495 and 99-10664) supported this research.

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  1. Departmentof Geology, Faculty of Science, Bu-Ali Sina University, Hamedan, Iran

    Tahereh Molaei Yeganeh, Ashraf Torkian & Ali A. Sepahi

  2. Department of Geological Sciences, Brigham Young University, Provo, UT, 84602, USA

    Eric H. Christiansen

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Yeganeh, T.M., Torkian, A., Christiansen, E.H. et al. Petrogenesis of the Darvazeh mafic-intermediate intrusive bodies, Qorveh, Sanandaj-Sirjanzone, Iran. Arab J Geosci 11, 202 (2018). https://doi.org/10.1007/s12517-018-3554-y

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