The Upper Triassic -Norian–Rhaetian- Nayband Formation at the southwestern margin of Central East Iranian Microcontinent is composed of mixed carbonate-siliciclastic deposits, is crucial as it records the Eo-Cimmerian events. This study presents information on the tectonic reconstruction and palaeoclimate of southwestern margin of Central East Iranian Microcontinent during the Late Triassic. Petrography and modal analyses of the sandstones show a variety of quartz rich petrofacies including subarkose, lithic arkose, sublitharenite, feldspathic litharenite and litharenite. The combined modal analysis and geochemical results of major and trace elements of the sandstone samples represents mixed sedimentary, intermediate, felsic igneous rocks and moderate to high-grade metamorphic provenance area. The major elements and modal analyses of the Nayband Formation sandstone samples suggest an active continental margin tectonic settings. The palaeoclimatic conditions were sub-humid to humid with relatively low to moderate weathering in the source area which is in agreement with the palaeogeography and palaeotectonic history of southwestern margin of Central East Iranian Microcontinent during the Late Triassic.

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