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Controls on the sequence stratigraphic architecture of the Neogene Zagros foreland basin

By
Mortaza Pirouz
Mortaza Pirouz
Division of Geological and Planetary Sciences, California Institute of Technology, Mc 100-23,1200 E. California Boulevard, Pasadena, California 91125, USA
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Guy Simpson
Guy Simpson
Section of Earth and Environmental Sciences, University of Geneva, 13 Rue des Maraîchers, 1205 Geneva, Switzerland
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Sebastien Castelltort
Sebastien Castelltort
Section of Earth and Environmental Sciences, University of Geneva, 13 Rue des Maraîchers, 1205 Geneva, Switzerland
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Georges Gorin
Georges Gorin
Section of Earth and Environmental Sciences, University of Geneva, 13 Rue des Maraîchers, 1205 Geneva, Switzerland
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Abbas Bahroudi
Abbas Bahroudi
Exploration Department, Mining Engineering Faculty, University College of Engineering, University of Tehran, North Karghar Street, P.O. Box 1439, Tehran 957131, Iran, and Department of Geoscience, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada, T2N 1N4
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Published:
December 21, 2017
Publication history
15 June 201627 January 2017

ABSTRACT

We investigated the sequence stratigraphic architecture of Neogene deposits in the Zagros region using 12 measured stratigraphic sections and performing strontium isotope measurements on 10 samples. We combined our data with 44 previous published Sr isotope measurements and five paleomagnetostratigraphic sections in order to place the foreland deposits in a chronostratigraphic framework. Two chronostratigraphic charts were created, and transgressive-regressive system tracts were identified in the western and eastern sectors of the Zagros. These results show that the southward migration of the Zagros fold-and-thrust belt led to broadly upward-coarsening, progradational sequences due to progressive uplift and seaward (south-westward) migration of the Zagros fold-and-thrust belt. In addition, we show distinct differences in the sequences between the eastern and western sectors. It can be inferred that, in the strike-parallel direction, the Zagros foreland basin did not respond in a simple manner to tectonics and global sea-level changes during the Neogene. The different architecture of the sequences and mismatch of Neogene sedimentary architecture with global sea-level curves imply different orogen-parallel evolutionary histories and strong impact of tectonics on the basin evolution as compared to eustasy. Finally, we present evidence for a retrogradational sequence related to a period of enhanced deformation and related crustal thickening during the middle Miocene in the eastern Zagros.

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Contents

GSA Special Papers

Tectonic Evolution, Collision, and Seismicity of Southwest Asia: In Honor of Manuel Berberian’s Forty-Five Years of Research Contributions

Geological Society of America
Volume
525
ISBN electronic:
9780813795256
Publication date:
December 21, 2017

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