Study of main planktonic foraminifera(Turonian-Santonian) in Kopeh-Dagh sedimentary environment, NE Iran

Document Type : Original Research Article

Authors

Department of Geology, Faculty of sciences, Ferdowsi University of Mashhad, Mashhad, Iran

Abstract

In order to study the fossil contents of the Abderaz Formation for biostratigraphical purposes the 500 meters thick section was sampled at type section. The sequence is mainly made up of grey shales and marls with two units of chalky limestone in upper part. The lower contact of the formation with Aitamir Formation is disconform while the upper contact with Abtalkh is continuous. Fifty six species belonging to 16 genera were identified and four biozones were differentiated. These are: Helvetoglobotruncana helvetica (Sigal)total range Zone, 2-Marginotruncana sigali - Dicarinella primitiva (Premoli Silva and Sliter)Partial range Zone, 3- Dicarinella concavata (Sigal)interval Zone and4-Dicarinella asymetrica (Postuma)total range Zone. Based on, these an age of Turonian-Late Santonian is quoted to the formation. Also it was shown that Helvetoglobotruncana helvetica, the index species for middle Turonian exists at the base of the formation while, in the samples immediately below this belonging to Aitamir Formation Rotalipora appenninica, the index for middel cenomanian was recorded. Therefore, lack of index species for late Cenomanian- early Turonian shows a gap spanning this period between the Aitamir and Abderaz formations. This could be a result of sub Hersinian orogeny.

Keywords

Main Subjects

References

Abdel-Kireem, M.R., Samir, A.M. & Ibrahim, M.I.A. 1995. Upper Cretaceous planktonic foraminiferal zonation and correlation in the northern part of Western Desert, Egypt. Neues Jahrbuch für Geologie und Paläontologie-Abhandlungen, 198(3), 329-361.
Barr, F.T., 1972. Cretaceous biostratigraphy and planktonic foraminifera of Lybia. Micropaleontol, 18(1), 1-46.
Bolli, H.M., 1957. The genera Praeglobotruncana, Globotruncana, Rotalipora Abathomphalus in the Upper Cretaceous of Trinidad, B.W.I.U.S. Natural History Museum Bulletin, 215, 51-60
  Caron, M., 1985. Cretaceous planktic foraminifera. In. Bolli, H.M., Saunders, J.B., Perch Nielsen,K. (Eds), Plankton stratigraphy, Cambridge university press, 17-86.
COCCIONI, R. & PREMOLI-SILVA, I., 2015. Revised upper Albian–Maastrichtian planktonic foraminifera biostratigraphy and magnetostratigraphy of the classical Tethyan Gubbiosection (Italy). Newsletters on Stratigraphy, 48, 47-90.
Dimitrova, E. & Valchev, B., 2007. Attempt for upper cretaceous planktic foraminiferal zonation of the srednogoriå and eastern balkan zones (bulgaria). Geologica balcanica, 36(1-2), sofia, iun. 55-63.
Ellis, B.F. & Messina, A.R., 1999. Catalogue of foraminifera on CD ROM.American Museum of Natural History.
Fleury, J.J., 1980. Les zones de Gavrovo-Tripolitza et du Pinde Olonos (Grece continentale et Peloponnese du Nord). Evolution d, plate-forme et dun bassin dans leur cadre Evolution dune plate-forme et dun bassin dans cardre alpin.Societe Geologique du Nord, 4, 1-648
Gorbachik, T.N., 1971. Abrief characteristic of Cretaceous and Paleogene deposits of the Mountain Crimea. In XII European Micropaleontological Colloquium, 13-28‏.
Gorbachik, T.N., 1971a. On Cretaceous foraminifera of the Crimea. Voprosy Mikropaleontology, 14, 125-216.
Gradstein, F.M., Agterberg, F.P., Ogg, J.G., Hardenbol, J., van Veen, P., Thierry, J. & Huang, Z., 1994. A Mesozoic time scale. Journal of Geophysical Research: Solid Earth, 99(B12), 24051-24074.‏
Grandstein, F.M., Bukry, D., Hbib, D., Renz, O. & Roth, P.H., 1978. Biostratigraphic summary of DSDP Leg 44: Western North Atlantic Ocean. Initial Report. Deep Sea Drill. Project., 44, 567-62
Keller, G. & Pardo, A., 2004. Paleoecology of the Cenomanian – Turonian Stratotype Section (GSSP) at Pueblo, Colorado. Marine Micropleontology, 51, 95-128.
Keller, G., Berner, Z., Adatte, T. & Stueben, D., 2004. Cenomanian–Turonian and δ13C, and δ18O, sea level and salinity variations at Pueblo, Colorado. Palaeogeography, Palaeoclimatology, Palaeoecology, 211(1-2), 19-43.‏
Loeblich Jr, A.R. & Tappan, H., 2015. Foraminiferal genera and their classification, Springer.‏
Maslakova, N.I., 1971. Contribution to the systematics and phylogeny of the Globotruncanids. Voprosy Mikropaleontology, 8, 102-17
McNulty, C.L., 1976. Cretaceous foraminiferal stratigraphy, DSDP Leg 33, Holes 315A, 317a. Initial Report. Deep Sea Drill. Project, 33, 369-381.
Ogg, J., Agterberg, F.P. & Gradstein, F.M., 2004. The Cretaceous Period. In: Gradstein, F.M., Ogg, J. and Smith, A. (Eds.): A geologic time scale, Cambridge University Press, 344-383.
Peryt, D. & Lamolda, M.A., 2002. Benthic foraminifers from the Coniacian- Santonian boundary interval at Olazagutia, Spain. In: Lamolda, M.A. (Comp.), Meeting on the Coniacian-Santonian Boundary, Bilbao, p. 19.
Pessagno Jr, E.A. & Longoria, J.F., 1973. Shore laboratory report on Mesozoic planktonic foraminifera. Deep Sea Drill Project Leg, 16(16), 891-894.
Pessagno Jr, E.A. & Longoria, J.F., 1973. Shore laboratory report on Mesozoic planktonic foraminifera. Deep Sea Drill Project Leg, 16(16), 891-894.
‏Postoma, J., 1971. Manual of Planktonic Foraminifera. Elsevier PublishingCompany.Amsterdam, 420 p.
Sustainable Earth Trends
Volume 1, Issue 4 - Serial Number 4
October 2021
Pages 36-43

Files

Share

How to cite

Statistics