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Biostratigraphy of the Asmari Formation at Khaviz and Bangestan Anticlines, Zagros Basin, SW Iran

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Abstract:

Paleontological and biostratigraphical studies on a carbonate platform succession from southwestern Iran documented a high diversity of shallow-water benthic foraminifera during the Oligocene–Miocene. Larger foraminifera are the main means for stratigraphic zonation of the Asmari Formation. The distributions of larger benthic foraminifera in two outcrop sections (Khaviz and Bangestan Anticlines) in the central part of the Zagros Fold-and-Thrust Belt (Iran) are used to determine the age of the Asmari Formation in this area. Four assemblage zones are recognized by distribution of larger benthic foraminifera in the study areas. Assemblage zone 1 is Rupelian–Chattian in age and occurs in the lower part of the Asmari Formation. Assemblage zone 2 suggests a Chattian age. Assemblage zone 3 indicates an Aquitanian age and Assemblages zone 4 is restricted to the Burdigalian. Assemblage zones 1 (Rupelian–Chattian) and 2 (Chattian age) were not recognized in the Asmari Formation of the Bangestan Anticline section. The Oligocene shallow carbonate part of the Asmari Formation has been replaced by the basinal marl of the Pabdeh Formation in the Bangestan Anticline. This suggests that the Bangestan Anticline section was situated in a basinal position during the Oligocene.

Keywords: ASMARI FORMATION; BANGESTAN ANTICLINE; BIOSTRATIGRAPHY; KHAVIZ ANTICLINE; LARGER BENTHIC FORAMINIFERA; MIOCENE; OLIGOCENE; ZAGROS BASIN

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0077-7749/2011/0189

Publication date: January 1, 2012

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