Abstract
In this paper, Biostratigraphy of Asmari formation to San oligo-Myocene was studied in North Mamulan, South West Lorestan Province. In this region, Shahbazan-Asmari carbonate formation is located between Kashkan formation beneath and evaporative formation of Gachsaran as old as lower Miocene in the form of disconformity above. From 180 m real thickness observed in this study, 23 genera and 15 species of benthic foraminifera were identified and studied. These foraminifera were found in four assemblage zones suggesting that this formation dates back to Oligocene (Chattian-Rupelian) and early Miocene (Aquitanian-Burdigalian). Moreover, based on microscopic studies and visual observations, nine microfacies were identified that were deposited in three zones: lagoon, dam, and shallow open marine.
Highlights
Zagros orogenic belt (Figure 1) is a result of the Closure of the Neotethys
Analyses of Asmari lime formation in Mamoolan stratigraphy section have led to following results: 1) The real thickness of deposits of Asmari lime formation in Mamoolan stratigraphy section is 180 m. 2) The lower boundary of Asmari lime formation and Kashkan formation in Mamoolan stratigraphy section, southwest of Lorestan and north of Poldokhtar is in the form of conglomerate and red siltstone sediments
3) The upper boundary of lime deposits of Asmari lime formation is covered by Evaporite Gachsaran Formation
Summary
Zagros orogenic belt (Figure 1) is a result of the Closure of the Neotethys. Subduction of Neotethys oceanic crust and the convergence between Arabian and Iranian plateaus concurrent with the Zagros orogenic activity occurred originally by establishment of ophiolites in the north eastern margin of Arabian plateau and the region extending from south east Turkey to Oman, which this tectonic event was mainly in Late Cretaceous and Paleocene. Stratigraphic column is consisted of approximately 5 - 4 km of Pre-orogenic sediments and about 6 km synorogenic facies, which are mostly Cenozoic carbonates. This synorogenic sequence from bottom to top includes deposits of Amiran, Kashkan, Shahbazan-ASMARI, Gachsaran, Aghajari Formations, and Bakhtiari debris facies [1]
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