THE NEOGENE MOLASSE DEPOSITS OF THE ZAGROS MOUNTAINS IN CENTRAL DEZFUL EMBAYMENT: FACIES, SEDIMENTARY ENVIRONMENTS AND CONTROLS

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JALILIAN ALI HOSSEIN

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Journal: JOURNAL OF STRATIGRAPHY AND SEDIMENTOLOGY RESEARCHES Year:2016 | Volume:32 | Issue:1 (62) Page(s): 81-98

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Title

THE NEOGENE MOLASSE DEPOSITS OF THE ZAGROS MOUNTAINS IN CENTRAL DEZFUL EMBAYMENT: FACIES, SEDIMENTARY ENVIRONMENTS AND CONTROLS

Author(s)

JALILIAN ALI HOSSEIN | Issue Writer Certificate

Keywords

ZAGROS MOLASSE BASINQ1

BASE LEVELQ1

AGHAJARI AND BAKHTYARI FORMATIONSQ1

Abstract

The upper part of Neogene sequence of the Zagros Mountains consists of a clastic succession which is identified as AGHAJARI AND BAKHTYARI FORMATIONS. The sequence is an excellent example of synorogenic sedimentation or molasse deposited in northern portion of the Zagros foreland basin. Sedimentological analysis of an outcrop section representing Miocene-Pliocene sediments in central Dezful Embayment resulted in recognizing 9 lithofacies and 4 architectural elements. These lithofacies include conglometate (Gt, Gh, Gmm), sandstone (Sp, Sh, Sr, St) and mudstone (Fm, Fl) that were deposited in meandering stream, braided river and alluvial fan environments. Paleocurrent analysis of cross-beds, channels and asymmetric ripple marks indicate that these Neogene clastics were mainly drived from Cretaceous to Paleogene highlands in the Zagros Mountains on the north. This stratigraphic record is coarsening-upward and formed by a regressive depositional megacycle under arid climate. Facies and depositional history analysis show that sedimentation of the Zagros molasse was primarily controlled by base-level changes rather than catchment lithology or climate. The sedimentary record of this regressive megacycle reveales the base-level was constantly falling down on one hand and the provenance was uplifting on the other hand. Tectonic activities and Zagros Mountains rising in the Late Miocene resulted in deposition of fining-upward point-bar and floodplain sequences of the Aghajari Formation in low-gradient meandering streams. The Lahbari Member of the Aghajari Formation represents deposition in braided rivers that composed predominantly of flood-plain deposits in the Early Pliocene. Finally, the sedimentary cycle of the Zagros molasse deposits terminated with massive conglomerates of the Bakhtyari Formation deposited in large alluvial fans near the source area.

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APA: Copy

JALILIAN, ALI HOSSEIN. (2016). THE NEOGENE MOLASSE DEPOSITS OF THE ZAGROS MOUNTAINS IN CENTRAL DEZFUL EMBAYMENT: FACIES, SEDIMENTARY ENVIRONMENTS AND CONTROLS. JOURNAL OF STRATIGRAPHY AND SEDIMENTOLOGY RESEARCHES, 32(1 (62)), 81-98. SID. https://sid.ir/paper/157045/en

Vancouver: Copy

JALILIAN ALI HOSSEIN. THE NEOGENE MOLASSE DEPOSITS OF THE ZAGROS MOUNTAINS IN CENTRAL DEZFUL EMBAYMENT: FACIES, SEDIMENTARY ENVIRONMENTS AND CONTROLS. JOURNAL OF STRATIGRAPHY AND SEDIMENTOLOGY RESEARCHES[Internet]. 2016;32(1 (62)):81-98. Available from: https://sid.ir/paper/157045/en

IEEE: Copy

ALI HOSSEIN JALILIAN, “THE NEOGENE MOLASSE DEPOSITS OF THE ZAGROS MOUNTAINS IN CENTRAL DEZFUL EMBAYMENT: FACIES, SEDIMENTARY ENVIRONMENTS AND CONTROLS,” JOURNAL OF STRATIGRAPHY AND SEDIMENTOLOGY RESEARCHES, vol. 32, no. 1 (62), pp. 81–98, 2016, [Online]. Available: https://sid.ir/paper/157045/en

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