Study of Abtalkh formation based on ostracodea to determine paleoecology and paleoenvironment in Bafaraji section

Document Type : مقالات پژوهشی

Authors

• Zinat Soleyman Noori
• Mohsen Allameh
• Habibollah Torshizian
• Reza Sharifian Attar

10.22067/sed.facies.v3i1.2569

Abstract

In the North & E. North of Iran Kopeh Dagh basin has formed and begins from khazar sea, passes through Turkmenistan and Iran, then inter Afghanistan. Abtalkh formation is one of the sedimentary units of this basin that has been studied based on other fossils several times such as foraminifera, palinomorphs and nanoplanctons. The study area is located in 135 Kilometers of Mashhad-Kalat road, with geographical features North latitude 59° 46' 54" and Earst longitude 36° 55' 42", and its lithology is mostly of blue-gray chalky shale with layers of marn. Its down boundary with Abderaz formation and upper boundary with Neyzar formation is conformable and its thickness is 980 M. For studying of formation according to Ostracoda, 46 samples have been taken. For separating Ostracoda of surrounded sediment, samples were washed and then were photographed by electronically microscope. We organized 57 spices for 26 genus from Ostracoda. According to, age of Abtalkh formation is santonian-masterishtian.

Keywords

• Kopeh Dagh
• Abtalkh Formation
• Bafaraji
• Ostracods
• paleoecology

---

References

آقانباتی، ع.، 1383. زمین شناسی ایران. سازمان زمین شناسی و اکتشافات معدنی کشور، 586 ص.

افسری کهنه شهری، س.، 1387. پالینواستراتیگرافی سازند آب تلخ در برش حمام قلعه واقع در حوضه رسوبی کپه داغ. پایان نامه کارشناسی ارشد، دانشگاه آزاد اسلامی واحد مشهد.

افشارحرب، ع.، 1373. زمین شناسی کپه داغ. سازمان زمین شناسی و اکتشافات معدنی کشور، ۲۷۵ ص.

انجیدنی، ف.، 1388. بایواستراتیگرافی سازند آب تلخ در برش حمام قلعه براساس میکروفسیلهای پلانکتونیک. پایان نامه کارشناسی ارشد، دانشگاه آزاد اسلامی واحد مشهد.

علامه، م.، حسن زاده، ع.، 1386. مطالعه سازند آب تلخ بر مبنای استراکودها (شمال شرق روستای پادها). اولین کنگره

زمین شناسی کاربردی ایران، دانشگاه آزاد اسلامی واحد مشهد.

هادوی، ف.، 1386. نانوفسیلهای آهکی کرتاسه کپه داغ. سازمان زمین شناسی و اکتشافات معدنی کشور، 493 ص.

Cabral, M.C., Colin, J.P., & Azeredo, A.C., 1897. Taxonomy and Palaeoecology of new brackish osteracoda species from the Middle Cenomanian of lousa Lisbonregion, Portugal. Palaeogeography, Palaeoclimatology, Palaeoecology, 264: 250-262

Caus, E., Tambareau, Y., Colin, J.P., Aguilar, M., Bernaus, J.M., Garrido, A.G., & Brusset, S., 2002. Upper Cretaceous microfouna of the Cardenas Formaition, Sanluis potosi, NE. Mexico, Biostratigraphical, palaeoecological and palaeogeographical significance. Revista Mexicana de ciencias Geologicas, 19: 137-144

Swain, F.M., 2007. Biostratigraphy of Cretaceous ostracoda from wells in South Carolina. 5: 1- 30.

Freiwald, A., & Mostafawi, B.N., 1998. Ostracods in a cold temperate coastal environment Western Troms, Northern Norrway: Sedimentary aspect and assemblages. Facies, 38: 255-274.

Guernet, C., Bourdillon, C., & Roger, J., 1991. Palaeogene Ostracods of Dohofar (Oman), Strtigraphical and Paleogeographical Implications. Reveue de Micropaleontologie, 34: 297-311.

Lines, K., Brandet, A., Bohn, J.N., Danis, B., Broyer, C., & Ebbe, B., 2007. Macro and Mega benthic assemblages in the bathyal and abyssal Weedel Sea. Oceanography Journal, 54: 1848-1863.

Loger, P., 2003. Paleobiogeography of late Early Cretaceous to Early Paleocene marine ostracoda in Arabia and North to Equatorial Africa. Palaeogeography, Paleoecology, Palaeoclimatology, 196: 319-349.

Moore, R.C., 1961. Treatise on invertebrate paleontology, Part Q, Arthropoda 3, Osteracoda. Geol. Soc. America and Univ. Kansas, 422 p.

Shahin, A., 2005. Maastrichtian to Middle Eocene ostracodes from Sinai, Egypt: systematics, biostratigraphy and paleobiogeography. Revue de Paleobiologie, 24: 749-779.

Whatley, R., & Bajpai, S., 2000. Further nonmarine ostracoda from the Late Cretaceous intertrappean deposits of the Anjar region, Kachchh, Gujarat, India. Micropaleontologie, 43: 173- 178.

Whatley, R.C., Pyne, R.S., & Wilkinson, I.P., 2003. Ostracodes and palaeo-oxygen levels, with particular reference to the Upper Cretaceous of East Anglia. Palaeogeography, Paleoecology, Palaeoclimatology, 194: 355-386.