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The origin of mafic rocks in the Naqadeh intrusive complex, Sanandaj-Sirjan Zone, NW Iran |
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| Authors: | Seyed Ali Mazhari Sadraldin Amini Jalil Ghalamghash Fernando Bea |
| Institution: | 1. Department of Geology, Payame Noor University (PNU), Sabzevar, Iran 2. Department of Geology, Tarbiat Moallem University, 49, Mofatteh Avenue, Tehran,, 15614, Iran 3. Department of Petrology, Geological Survey of Iran, P.O. Box 13185–1494, Tehran, Iran 4. Department of Mineralogy and Petrology, University of Granada, Fuentenueva Campus, 18002, Granada, Spain |
| Abstract: | The Naqadeh mafic plutonic rocks are located on a plutonic assemblage and include different granitoid rocks related to ～40 Ma. U-Pb SHRIMP data shows different ages of 96?±?2.3 Ma for mafic rocks. Naqadeh mafic plutonic rocks consist of diorite to diorite-gabbros with relatively high contents of incompatible elements, low Na2O, and $ {\hbox{Mg\# }} = \left {{\hbox{molar}}{100} \times {\hbox{MgO/}}\left( {{\hbox{MgO}} + {\hbox{FeO}}} \right)} \right] > 44.0 $ . These features suggest that the Naqadeh mafic rocks originate from enriched lithospheric mantle above subducted slab during Neotethys subduction under Iranian plate. |
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