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Cretaceous tectonic evolution of the Neo-Tethys in Central Iran:Evidence from petrology and age of the Nain-Ashin ophiolitic basalts

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Geoscience Frontiers 2020年第1期11卷 57-81页

作者： Tahmineh Pirnia Emilio Saccani ghodrat torabi Marco Chiari Spela Gorican Edoardo Barbero Department of Physics and Earth Sciences Ferrara UniversityFerrara44122Italy Department of Geology Faculty of ScienceUniversity of IsfahanIran CNR Istituto di Geoscienze e GeorisorseFlorenceItaly Paleontoloski institut Ivana Rakovca ZRC SAZU LjubljanaSlovenia

The Nain and Ashin ophiolites consist of Mesozoic melange units that were emplaced in the Late Cretaceous onto the continental basement of the Central-East Iran microcontinent(CEIM).They largely consist of serpentinized peridotites slices;nonetheless,minor tectonic slices of sheeted dykes and pillow lavas-locally stratigraphically associated with radiolarian cherts-can be found in these ophiolitic *** on their whole rock geochemistry and mineral chemistry,these rocks can be divided into two geochemical *** sheeted dykes and most of the pillow lavas show island arc tholeiitic(IAT)affinity,whereas a few pillow lavas from the Nain ophiolites show calc-alkaline(CA)*** modeling based on trace elements composition indicates that both IAT and CA rocks derived from partial melting of depleted mantle sources that underwent enrichment in subduction-derived components prior to *** modeling shows that these components were represented by pure aqueous fluids,or sediment melts,or a combination of both,suggesting that the studied rocks were formed in an arc-forearc tectonic *** new biostratigraphic data indicate this arc-forearc setting was active in the Early *** tectonic interpretations suggested that the Nain ophiolites formed,in a Late Cretaceous backarc basin located in the south of the CEIM(the so-called Nain-Baft basin).However,recent studies showed that the CEIM underwent a counter-clockwise rotation in the Cenozoic,which displaced the Nain and Ashin ophiolites in their present day position from an original northeastward *** evidence combined with our new data and a comparison of the chemical features of volcanic rocks from different ophiolites around the CEIM allow us to suggest that the Nain-Ashin volcanic rocks and dykes were formed in a volcanic arc that developed on the northern margin of the CEIM during the Early Cretaceous in association with the subduction,below the CEIM,of a Neo

关键词： Ophiolite Volcanic arc Early Cretaceous Nain Ashin Iran

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