Document Type : Original Research Paper


1 Department of Geology, Faculty of Sciences, Science & Research Branch Islamic Azad University, Tehran, Iran

2 School of Earth Sciences, Shahid Beheshti University, Tehran, Iran

3 Department of Geology, Faculty of Sciences, Ferdowsi University, Mashhad, Iran


The Givetian-Frasnian sandstones in the Kuh-e-Tizi section (25 km NE Kerman), unconformably overlie the Upper Cambrian Kuhbanan and underlie the Lower Carboniferous Hutk Formations respectively, in southeastern Central Iran. Petrographical data show that these sandstones are well-sorted, sub-angular to rounded quartzarenite. Diagenetic features include physical and chemical compactions (straight, concavo-convex, sutured grain contacts and pressure solution of quartz grain), reduction of the pore space through rearrangements and cementation (mostly silica, as quartz overgrowth). The provenance and tectonic setting of these sandstones have been interpreted using integrated petrographic and geochemical data. Petrographic analysis using standard methods revealed that mono and poly-crystalline quartz grains have been derived from plutonic rocks of an interior cratonic setting. Trace element analyses and their ratios used for provenance studies (Th/Sc and La/Sc) are similar to sediments derived from weathering of mostly felsic rocks. Values representing chemical index of alteration (CIA) and the plagioclase index of alteration (PIA) range from 44.24 to 83.43, with an average of 69.96, and from 42.98 to 92.56, with an average of 75.8, respectively. However, most samples have values greater than 60, suggesting moderate to high weathering in the source area or during transportation prior to find deposition. Major and trace element concentrations indicated a depositional setting in a passive continental margin.


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