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Provenance evolution of Oligocene-Pliocene foreland deposits in the Dezful Embayment to constrain central Zagros exhumation history

Najmeh Etemad-Saeed, Mahdi Najafi and Jaume Verges
Provenance evolution of Oligocene-Pliocene foreland deposits in the Dezful Embayment to constrain central Zagros exhumation history
Journal of the Geological Society of London (March 2020) 177 (4): 799-817

Abstract

This paper presents a detailed provenance analysis of the 6.5-km thick Oligocene-Pliocene foreland succession in the north Dezful embayment in Zagros, Iran. Using petrography, geochemistry, and paleoflow analysis, we determined three provenance shifts during the exhumation of Zagros orogen. Above the Ahwaz sandstones, sourced from the Arabian craton, a sharp decrease in SiO (sub 2) /Al (sub 2) O (sub 3) , Zr/Sc, Th/Sc, Th/Co and Th/Cr within the Gachsaran Fm., and the appearance of first-cycle sands derived from metamorphic and volcanic rocks at the base of Aghajari Fm., characterize the onset of exhumation, rising topography and denudation of the Zagros orogenic system during latest Oligocene and constitute the first shift. The second shift, in middle Aghajari Fm., is marked by a distinct increase in radiolarian cherts and compatible/incompatible elements, indicating the exhumation of Neo-Tethyan radiolarite-ophiolite allochthonous slices in the High Zagros Zone during Tortonian ( approximately 9 Ma). A vast number of carbonates derived from nearby growing Izeh Zone anticlines characterize the Messinian ( approximately 7 Ma) Bakhtyari conglomerates marking the third shift. In conclusion, a detailed hands-on provenance analysis of the clastic sedimentary sequences in the north Dezful embayment enabled us to determine catchment areas and shifts hitherto unstudied thus contributing to the exhumation history of the Central Zagros orogenic system. Supplementary material: Details of the petrography and geochemistry results are presented in 7 tables and 4 figures https://doi.org/10.6084/m9.figshare.c.4905558.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 177
Serial Issue: 4
Title: Provenance evolution of Oligocene-Pliocene foreland deposits in the Dezful Embayment to constrain central Zagros exhumation history
Affiliation: Institute for Advanced Studies in Basic Sciences, Department of Earth Sciences, Zanjan, Iran
Pages: 799-817
Published: 20200325
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 105
Accession Number: 2020-047132
Categories: StratigraphyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. block diags., sect., strat. col., geol. sketch maps
N31°00'00" - N35°00'00", E47°00'00" - E50°00'00"
Secondary Affiliation: Institute of Earth Sciences Jaume Almera, Group of Dynamics of the Lithosphere, ESP, Spain
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 202029
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