دانشگاه اصفهان پژوهش های چینه نگاری و رسوب شناسی 2008-7888 مقالات آماده انتشار 2026 01 11 The Tethyan Seaway during Late Miocene-Early Pliocene: with indication of constraints from foraminifera of the Southern Iran The Tethyan Seaway during Late Miocene-Early Pliocene: with indication of constraints from foraminifera of the Southern Iran 1 30 30228 10.22108/jssr.2026.146509.1319 FA Fereshteh Mahdipour Haskouei Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran Ali Bahrami Department of Geology, Faculty of Sciences, University of Isfahan Mehdi Yazdi Department of Geology, Faculty of Sciences. University of Isfahan. Hossein Vaziri-Moghaddam Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran Azizollah Taheri Faculty of Earth Science, Department of Geology, Shahrood University of Technology, Shahrood, Iran Journal Article 2025 08 30 A micropaleontological analysis of the Miocene strata in the Qeshm and Minab regions of southern Iran has yielded a diverse foraminiferal assemblage, comprising twenty-five species belonging to fifteen genera. This fauna is predominantly reported for the first time from these studied outcrops. The identified taxa include: Asterorotalia dentata, A. pulchella, Triloculina tricarinata, T. terquemiana, T. trigonula, Trilobatus (Globigerinoides) trilobus, Globigerina bulloides, Quinqueloculina bogdanowiczi, Textularia agglutinans, Praeorbulina transitoria, Elphidium crispum, E. craticulatum, E. asiaticum, E. advenum limbatum, E. advenum macelliforme, E. advenum maorium, Poroeponides lateralis, Eponides repandus, Eponides isabellanus, Rotalinoides compressiuscula, Challengerella bradyi, Ammonia beccarii, and Bolivina spathulata. Biostratigraphic analysis, based on key index species, provides refined age constraints for the regional stratigraphy. Within the Mishan Formation on Qeshm Island, the presence of Praeorbulina transitoria and Quinqueloculina bogdanowiczi in the white sandy limestone of the Stars Valley section indicates a Langhian-Serravallian boundary age. The uppermost strata of the Mishan Formation on the island suggest a depositional range extending from the late Serravallian to the Mio-Pliocene boundary, potentially correlating with the interval of global planktonic foraminiferal zones N8-N9 to N19-N20. In the Minab region, the Gushi Marl of the Makran Basin is dated to the latest Miocene (Messinian) to early-middle Pliocene (Zanclean to Piacenzian boundary), corresponding to the time encompassed by biozones N19-N20. The paleobiogeographic distribution of the fauna is particularly significant. The co-occurrence of these species in the studied areas, coupled with the presence of Quinqueloculina bogdanowiczi-a taxon previously documented only from the Central Eastern Paratethys during the Serravallian to Tortonian-suggests the existence of a marine connection during the Late Miocene. This evidence supports a seaway linking the Iranian Gateway and the Iraqi Basin (represented by the Fatha Formation) with the marginal marine environments of the eastern Paratethys (Qom Basin), the Central Paratethys, the Indo-Pacific Ocean, and the proto-Mediterranean. A micropaleontological analysis of the Miocene strata in the Qeshm and Minab regions of southern Iran has yielded a diverse foraminiferal assemblage, comprising twenty-five species belonging to fifteen genera. This fauna is predominantly reported for the first time from these studied outcrops. The identified taxa include: Asterorotalia dentata, A. pulchella, Triloculina tricarinata, T. terquemiana, T. trigonula, Trilobatus (Globigerinoides) trilobus, Globigerina bulloides, Quinqueloculina bogdanowiczi, Textularia agglutinans, Praeorbulina transitoria, Elphidium crispum, E. craticulatum, E. asiaticum, E. advenum limbatum, E. advenum macelliforme, E. advenum maorium, Poroeponides lateralis, Eponides repandus, Eponides isabellanus, Rotalinoides compressiuscula, Challengerella bradyi, Ammonia beccarii, and Bolivina spathulata. Biostratigraphic analysis, based on key index species, provides refined age constraints for the regional stratigraphy. Within the Mishan Formation on Qeshm Island, the presence of Praeorbulina transitoria and Quinqueloculina bogdanowiczi in the white sandy limestone of the Stars Valley section indicates a Langhian-Serravallian boundary age. The uppermost strata of the Mishan Formation on the island suggest a depositional range extending from the late Serravallian to the Mio-Pliocene boundary, potentially correlating with the interval of global planktonic foraminiferal zones N8-N9 to N19-N20. In the Minab region, the Gushi Marl of the Makran Basin is dated to the latest Miocene (Messinian) to early-middle Pliocene (Zanclean to Piacenzian boundary), corresponding to the time encompassed by biozones N19-N20. The paleobiogeographic distribution of the fauna is particularly significant. The co-occurrence of these species in the studied areas, coupled with the presence of Quinqueloculina bogdanowiczi-a taxon previously documented only from the Central Eastern Paratethys during the Serravallian to Tortonian-suggests the existence of a marine connection during the Late Miocene. This evidence supports a seaway linking the Iranian Gateway and the Iraqi Basin (represented by the Fatha Formation) with the marginal marine environments of the eastern Paratethys (Qom Basin), the Central Paratethys, the Indo-Pacific Ocean, and the proto-Mediterranean.

https://jssr.ui.ac.ir/article_30228_2d19bd9357e4b567db60a8689c558580.pdf