Ordovician crustal thickening and syn-collisional magmatism of Iran: Gondwanan basement along the north of the Yazd Block (Central Iran)
INTERNATIONAL GEOLOGY REVIEW(2022)
摘要
This study investigates relicts of some granitic Gondwanan basement unexpectedly outcropping in the northwest of Central-East Iranian Microcontinent (CEIM) and incorporated into an ophiolitic melange. Based on petrographical (e.g. high modal content of muscovite (similar to 10 vol.%), absence of hornblende, inherited zircons (>541 Ma)), geochemical (peraluminous and calc-alkaline S-type affinity, high silica, high 'light rare earth element (LREE)/heavy rare earth element (HREE)' ratios, negative Nb and Ti anomalies), and geochronological (magmatic zircon age similar to 448 Ma) results, it is an Ordovician anatectic granite formed from a sedimentary source during crustal thickening in a syn-collisional setting. It shows some signatures of metamorphic deformation (cataclastic fabric, quartz bulging recrystallization, and foliation) likely developed in the Devonian (similar to 410 Ma). The U-Pb zircon ages from this granite are analogous to the other Ordovician collision-related magmatic events in the CEIM (Chahak to Airekan, Balvard). Our results confirm that Cadomian subduction and closure of the Proto-Tethys Ocean to the north of the Gondwana supercontinent resulted in crustal thickening during Ordovician collision-related magmatism and Devonian-Carboniferous regional metamorphism in the CEIM.
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关键词
Ordovician, Proto-Tethys Ocean, ophiolite, Gondwana, Iran
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