Depositional Evolutionand Sediment Facies Pattern of Upper Cretaceous in Zagros Basin, South of Iran
Year: 2013
Type: article
Abstract: The Upper Cretaceous (Campanian - Maastrichtian) units of Zagros fold-thrust belt were studied in four different regions (east khamir, west khamir, Namak and west Namak) in Hormozgan Province, Iran. Four cross-sections were constructed using well and outcrop data and illustrate facies and thickness variations within the Upper Cretaceous. Sedimentary environment and basin changes through the time of depositionofthese successions were studied. Based on the microfacies and by comparing the outcrops and wells, two depositional systems can be recognized in the Upper Cretaceous succession in the study area: intrashelf basin and pelagic-hemipelagic basin. Sediments deposited in intrashelf basin are dominated by thick to massive bedded limestone, Loftusia-bearing Packstone to Grainastone facies and index species of Loftusia give the age upper Maastrichtian. Pelagic basin Sedimentsfacies consist mainly thin to medium sized layers of gray marl and marlstone of wackestone to packstones with abundant pelagic foraminifera. Index species of Globotruncanagive the age of this sediment from Lower Companion to upper Maastrichtian. Rapid variations inthickness, Sequence stratigraphy and facies document the evolution of depositional processes in the foreland basin. In the study area, the foreland basin is characterized by a considerable SW to NE increase in stratigraphic thickness. The depocenter and related to maximum development of foreland basin of during this period of time was located in the SW as indicated by a thickness and facies.
Source: Geosciences
Language: English
Subfield: Earth-Surface Processes
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,172
OpenAlex ID: W201322844