SEISMIC INSIGHTS INTO THE OROGENIC DYNAMICS OFTHE EASTERN IRANIAN RANGES

This paper presents an integrated seismic study of the Eastern Iranian Ranges (EIR), examining thelithospheric and mantle dynamics since the region's formation in the Late Cretaceous. Throughanalysis of receiver function (RF) waveforms and inversion with Rayleigh wave velocity data, weunveil west-dipping lithospheric structures and a distinctive deepening of the Moho under the EIR,connoting complex intra-continental tectonics. Moreover, interpreting teleseismic records using nonlineartomography highlights stark mantle velocity contrasts, suggesting lithospheric dripping andconsequential asthenospheric rise that may drive the EIR's post-collisional magmatism andtopographic anomalies. Our findings portray the underthrusting of the Eurasian margin and possiblelithospheric delamination as significant contributors to the EIR's orogenic development, reflecting anintricate coupling of deep geodynamic mechanisms with surface geological features

Keywords:

Eastern Iran , Lithospheric and Mantle Dynamics , Receiver Function , SeismicTomography