Late Cretaceous Island-arc subduction magmatism in northern edge of central Iran, SW Sabzevar
Subject Areas :Elham Mirzakazemi 1 , Habibollah Ghasemi 2 , Fardin Mousivand 3 , Wilyam Griffin 4
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Keywords: Igneous rocks Magmatism Sabzevar Central Iran Late Cretaceous Neo-Tethys,
Abstract :
A thick sequence of Late Cretaceous volcano-sedimentary rocks crops out on the northern margin of Central Iran, in the southwest of the Sabzevar. The igneous rocks include extrusions (trachy-andesite, dacite and rhyolite) and shallow depth intrusions (gabbro, gabbrodiorite, diorite and granite). These igneous rocks have geochemical signatures of magmatic rocks of island-arc subduction zones and plot within field in different tectonic setting discrimination diagrams. The parental magma of these rocks has island arc tholeiitic nature and was produced via partial melting of a depleted spinel lherzolite mantle source during closing of the Sabzevar Neo-Tethyan oceanic basin in the Late Cretaceous. This depleted mantle source was affected by the metasomatic fluids released from dehydration of the Neo-Tethys subducted oceanic slab.
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