Compositional and Geochemical Signatures of Oligocene volcanoclastic sandstones of Abbasabad-Kahak area, NE Iran: Implications for provenance relations and paleogeography. (May 2022)

• Record Type: Journal Article
• Authors: Jafarzadeh, Mahdi; Shoghani-Motlagh, Maryam; Mousivand, Fardin; Criniti, Sara; Critelli, Salvatore
• Is Part Of: Marine and petroleum geology. Volume 139(2022)
• Publication Date: 2022-05
• Subjects: Early oligocene sandstones -- Iran -- Volcaniclastic sandstones -- Dissected magmatic arc provenance; Submarine geology -- Periodicals; Petroleum -- Geology -- Periodicals; Géologie sous-marine -- Périodiques; Pétrole -- Géologie -- Périodiques; Petroleum -- Geology; Submarine geology; Periodicals; Electronic journals; 551.468
• DOI: 10.1016/j.marpetgeo.2022.105605
• Languages: English
• ISSNs: 0264-8172

Abstract

Abstract: Petrography and geochemistry of sandstone for the lower Oligocene volcanic-related sandstones of Abbasabad-Kahak area, NE Iran, are detected to decipher provenance, tectonic setting and paleo-weathering of source areas. Lower Oligocene sandstones are grey in colour and host copper mineralization as bedded and lenticular, vein-veinlets and disseminated textures and structures. Texturally, sandstones are medium to coarse grained, moderately to poorly sorted and compositionally have abundance of volcanic lithic fragments. Sandstones are lithofeldspathic to feldspatholithic, leading to a provenance from the progressive dismantling of a magmatic arc. Geochemical signatures suggest a derivation from mafic-to-intermediate volcanic sources. CIA values (56–61 with the average of 57) indicate a low level of chemical weathering in source areas, which may reflect arid to semi-arid climatic conditions in source terrains. These sandstones, deposited in a remnant backarc basin, are the results of the post-Eocene extensional stage of a dismantling magmatic arc. Highlights: Petrological and geochemical characterization of Abbasabad-Kahak area, Iran. Geochemical signatures of provenance relations. Mafic and intermediate volcanic rocks as main source rocks. Oligocene arc-related active volcanism in a subduction complex.