Biostratigraphy of Dariyan Formation in Lar Anticline (north east Gachsaran) and Lower Cretaceous sediments in Kolah Ghazi section (South west Isfahan)
Subject Areas : Geoscience Fields in relation with Petroleum GeologyMahdie Shirzad 1 , Hosyen Vaziri moghadam 2 , Ali Bahrami 3
1 - دانشگاه اصفهان
2 - دانشگاه اصفهان
3 - دانشگاه اصفهان
Keywords: Dariyan Formation Lar Anticline Cretaceous sediments Kolah Ghazi Biostratigraphy Biozone ,
Abstract :
In order to identify foraminifera and determine the age of Dariyan Formation and the lower Cretaceous sediments of Central Iran, a section of Dariyan Formation in Lar Anticline (northeast Gachsaran) (with a thickness of 111m, thick, medium and thin layer of limestone, marl and marly limestone) and Kolah Ghazi section (south west Isfahan) (with a thickness of 260m, thick to medium layer limestone and shale) were studied. Based on biostratigraphic studies of Lar Anticline section, 28 benthonic foraminifera and 4 planktonic foraminifera have been identified in 4 biozones contains: Hedbergellids - Orbitolinids assemblage zone, Mesorbitolina texana zone, Mesorbitolina gr. subconcava zone, Favusella washitensis rang zone. Based on biostratigraphic of Lower Cretaseous sediments in Kuh-e-Kolah Ghazi, 21 benthonic foraminifera and 1 planktonic foraminifera have been identified and consequently 2 biozones are recognized contains: Mesorbitolina texana zone, Mesorbitolina gr. subconcava zonethe studied areas were correlated with some sections of the Dariyan in Kuh-e-Fahliyan, Kuh-e- Mangasht and Meymand. Accordingly, the sedimentation of two studied sections in Lar Anticline and Kuh-e-Kolah Ghazi were started from Late Aptian which were later than the other sections, and the end of sedimentation in the Kuh-e-Kolah Ghazi was earlier than the other sections in the Late Aptian age, while the end of sedimentation of Dariyan Formation in other sections was in Early Albian age
[1] درویش زاده، ع.، 1385، زمین شناسی ایران: انتشارات دانشگاه امیر¬کبیر تهران، 625 ص.
[2] آقانباتی، ع.، 1385، زمین شناسی ایران: سازمان زمین شناسی ایران و اکتشافات معدنی ایران، 586 ص.
[3] نقشه زمین شناسی ایران (شهرضا)، 1976، سازمان زمین شناسی کشور، مقیاس 1:100000، 1 صفحه.
[4] موسسه جغرافیایی و کارتو¬گرافی گیتا شناسی، 1384، اطلس راه¬های ایران، مقیاس 1:1000000، 1 صفحه.
[5] خسروتهرانی، خ.، 1384، زمین شناسی ایران: تهران، انتشارات کلیدر، 480 ص.
[6] قلاوند، ه.، 1375، لیتواستراتیگرافی و بیواستراتیوگرافی سازندهای داریان و کژدمی در جنوب غرب ایران (نواحی فارس و فروافتادگی دزفول): پایان نامه کارشناسی ارشد، دانشگاه شهید بهشتی تهران، 282 ص.
[7] فخر رحیمیان، م.، 1386، میکرواستراتیگرافی سازند داریان در برش نمونه (شمال شرق شیراز) و تاقدیس کوه آنه (شمال شرق گچساران): پایان نامه کارشناسی ارشد، دانشگاه شهید بهشتی تهران، 145 ص.
[8] HALLOCK, P., 1985, Why are larger foraminifera large: Paleobiology, 11(2), 195-208.
[9] BOUDAGHER-FADEL, M.K., 2008, Evolution and Geological Significance of Larger Benthic Foraminifera, Elsevier, 544 p.
[10] SCHROEDER, R., VANBUCHEM, F.S.P, CHERCHI, A., BAGHBANI, D., VINCENT, B., IMMENHAUSER, A. & GRAINER, B.,2010, Revised orbitolinid biostratigraphic zonation for the Barremian–Aptian of the eastern Arabian Plate and implications for regional stratigraphic correlations: GeoArabia Special Publication, 4(1), 49-96.
[11] YAVARI, M., YAZDI, M., GHALAVAND, H. & ADABI, M. H., 2015, Planktonic Foraminifera of the Dariyan formation and implications of Oceanic Anoxic Event 1a: Geopersia, 5(2), 125-137.
[12] WYND, J. G., 1965, Biofacies of the Iranian oil consortium agreement area: Iranian Offshore Oil Company report, 1082, 89.
[13] JAMEZ, G. A., & J. G. WYND, 1965, Stratigraphic nomenclature of Iranian oil consortium agreement area: American Association Petroleum Geologists Bulletin, 49, 2182-2245.
[14] GOLESTANEH, A., 1965, Micropaleontological study of Khami Group and the Jurassic-Cretaceous in Fars Province (southern Iran): Bulletin du Bureau de Recherches Géologiques et Minières, 4(3-1974), 165-197.
[15] WELLS, A. J., 1969, The crush zone of the Iranian Zagros Mountains and its implications: Geological Magazine, (106), 385-395.
[16] KHERADPIR, A., 1975, Stratigraphy of Khami Group in southwest Iran: Oregon State Correctional Institution Report, 1235.
[17] VANBUCHEM, F.S.P., BAGHBANI, D., BULOT, L.G., CARON, M., GAUMET, F., HOSSEINI, A., KEYVANI, F., SHROEDER, R., SWENNEN, R., VEDRENNE, V. & VINCENT, B., 2010, Barremian - Lower Albian sequence-stratigraphy of southwest Iran (Gadvan, Dariyan and Kazhdumi formations) and its comparison with Oman, Qatar and the United Arab Emirates: GeoArabia Special Publication, 4(2), 503-548.
[18] MOUSAVIZADEH, S.M.A., MAHBOOBI, A., MOSSAVI-HARAMI, R., KAVOOSI, M.A., and SCHLAGINTWEIT, F. 2015, Sequence stratigraphy and platform to basin margin facies transition of the Lower Cretaceous Dariyan Formation (northeastern Arabian plate, Zagros fold-thrust belt, Iran): Bulletin of Geosciences, 90(1), 145-172.
[19] STAHL, A.F., 1897, Zur Geologie von Persian, Geognostische Beschreibung von Nord-und Zentral Persian: Petermann ׳s Geographische Mittheilungen Gotha, Ergänzungsheftiche, 122, 72 p.
[20] SEYED-EMAMI, K., BRANTS, A. & BOZORGNIA, F., 1971, Stratigraphy of the Cretaceous rocks southeast of Isfahan: Geological Survey of Iran, 20, 5-27.
[21] PREMOLI SILVA, I., & VERGA, D., 2004, Practical Manual of Cretaceous Planktonic Foraminifera. In: Verga, D., & Rettori, R., (eds.): International school on Planktonic Foraminifera, Universities of Perugia and Milano, Tipografiadi di Pontefelcino, 1,
1-283
