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Depositional environments and trace fossil assemblages in the Pabdeh Formation (Paleogene), Zagros Basin, Iran

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Abstract:

This study focuses on interpreting the depositional environments in the Pabdeh Formation (late Paleocene-early Oligocene) in the Zagros Basin (W-Iran). It is based on field observations and measurements, thin section petrography, trace fossil analysis and organic matter (TOC % and kerogen type) measurements. Seven microfacies assemblages and two ichnoassemblages have been recognized. The Cruziana ichnofacies (Arenicolites, Chondrites, Planolites and Neonereites) formed under moderate energy conditions, the Zoophycos ichnofacies (Zoophycos and Chondrites) under lower energy and in deeper water conditions. Spatial relation ships of microfacies and ichnofacies suggest a distally steepening ramp with reducing conditions in oxygen depleted waters (TOC > 2.5%; kerogens type II, I and few type III) evolved into a middle ramp where marine currents had important impact on sediment reworking.

Keywords: CARBONATE RAMP; DEPOSITIONAL ENVIRONMENT; ICHNOFOSSIL; PABDEH FORMATION; TURBIDITE FACIES; ZAGROS BASIN

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0077-7749/2011/0185

Publication date: October 1, 2011

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  • Neues Jahrbuch für Geologie und Paläontologie continuously publishes current original contributions from all fields of geology, ever since its foundation in 1807. All published contributions are in the English language.
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