Diagenesis and geochemistry of siliciclastic facies from Ordovician of Rahdar Mountain, western Tabas

Document Type : مقالات پژوهشی

Authors

• Mohammad Khanehbad
• Seyed Reza Moussavi Harami
• Mahnaz Sabagh Bajestani

10.22067/sed.facies.v3i1.2867

Abstract

Petrographic, major and trace element composition of sandstones from Ordovician Rahdar Mountain have been investigated to determine their provenance, tectonic setting and paleo-weathering condition in the source area. Petrographically and geochemically, these sandstones are classified as quartzarenite and sublitharenite. All sandstone samples are enriched in quartz but poor in feldspar and rock fragments. These sandstones are commonly well cemented by silica (overgrowth or syntaxial cements) and rarely by carbonate, hematite and clay materials. The petrographic data suggest a recycled orogen and craton source terrain. Geochemical data suggest that these sediments were derived from quartzose sedimentary provenance (older sandstones). The mean CIW values (chemical index of weathering) for these sandstones are about 91 that suggest intense-weathering condition in source area. Humid climate prevailed during deposition of these sandstones.

Keywords

• diagenesis
• Geochemistry
• siliciclastic facies
• Rahdar
• Tabas

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