Biostratigraphy and microfacies of the Asmari Formation in Lar anticline (northeast of Gachsaran): biostratigraphical correlation
Subject Areas :Meysam Barari Kharkeshi 1 , Ali Seyrafian 2 , Hossein Vaziri-Moghaddam 3 , Roohollah Shabafrooz 4
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Keywords: Asmari Formation Oligocene – Miocene Lar anticline Biostratigraphy Microfacies Benthic foraminifera,
Abstract :
The Asmari Formation at the Lar anticline, located 77 km northeast of Gachsaran city, comprised 361 meters in thickness. In the present study, biostratigraphy and microfacies of the Asmari Formation at the Lar anticline (northeast of Gachsaran city) is investigated. Based on foraminiferal distribution, 25 genera and 21 species have been identified and four biozones: 1. Lepidocyclina – Operculina – Ditrupa assemblage zone, 2. Archaias asmaricus – Archaias hensoni – Miogypsinoides complanatus assemblage zone, 3. Indeterminate zone, 4. Borelis melo curdica – Borelis melo melo assemblage zone, representing Oligocene (Chattian) to Early Miocene (Aquitanian - Burdigalian) are introduced, respectively. 12 microfacies related to an open marine and lagoon (semi-closed and closed) environments of homoclinal ramp setting are present.
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