Document Type : Original Research Paper

Authors

1 Professor, Faculty of Science, Department of Geology, University of Esfahan, Esfahan, Iran

2 Assistant Professor, Faculty of Science, Department of Geology, University of Esfahan, Esfahan, Iran

3 M. Sc.Student, Faculty of Science, Department of Geology, University of Esfahan, Esfahan, Iran

4 Assistant Professor, Depatment of Geology, Faculty of Science, University of Birjand, Birjand, Iran

5 Associate Professor, Faculty of Earth Science, Shahrood University of Technology, Shahrood, Iran

Abstract

In order to study the biostratigraphy and palaeoecology of the Maestichtian deposits (Tarbur and Gurpi formations) in High Zagros, Gardbishe section in south of Borojen was selected. The Tarbur deposits in this region are mainly composed of carbonate and clastic a rock which has been overlaind by Gurpi Formation. The lower contact of this formation is lower red unit as conformable contact. The Gurpi Formation is lithologically composed of marl which has been overlaind as a disconformable contact by Shahbazan dolomites. The biostratigrphic data based on benthic and planktonic foraminifera and rudists represents the late Maestrichtian age for the section. Two biozones were identified in Maestrichtian deposits including: Omphalocyclus-Loftusia assemblage zone, Contusatruncana contusa-Recemiguembelina fructicasa zone. In general, the suitable environmental conditions for diversity, frequency and increase in size of some fossils such as Loftusia and in the absence of some other fossils such as Orbitoides and Lepidorbitoides in this region can be related to augmentation of nutrients and entering the detrital and silica sediments due to river injection and runoff and consequently to the eutrophic conditions formed in the basin.

Keywords

     
Aguirre, J. & Riding, R., 2005- Dasycladacean algal biodiversity compared with global variations in temperature and sea level over the past 350 Myr, Palaios, v. 20, p. 581-588.
Alegret, L. & Thomas, E., 2001- Upper Cretaceous and lower Paleogene benthic foraminifera from northeastern Mexico, Micropaleontology 47, p. 269-316.
Authemayou, C., Bellier, O., Chardon, D., Malekzad, Z. & Abbassi, M., 2005- Role of the Kazerun fault system in active deformation of the Zagros fold-and-thrust-belt (Iran), C.R.Geoscience 337, p. 539-545.
Bachmann, M. & Harsch, F., 2006- Lower Cretaceous carbonate platform of the eastern Levant (Galilee and the Golan Heights): stratigraphy and second-order sea-level change. Cretaceous Research, 27: 487-512.
Baumfalk, Y. A., 1986- The evolution of Orbitoides media (Foraminiferida) in the Late Campanian, Journal of Foraminiferal Research 16, p. 293-312.
Be, A. W. H., 1977- An ecological, zoogeographic and taxonomic review of recent planktonic foraminifera. In: Oceanic micropalaeontology Ramsay, A.T.S. (ed.), v. 1, p. 1-100.
Beavington-Penney, S. J. & Racey, A., 2004- Ecology of extant Nummulitids and other larger benthic foraminifera: applications in palaeoenvironmental analysis: Earth-Science Reviews, v. 67, p. 219-265.
Bolli, H. M. & Saunders, J. B., 1989- Plankton Stratigraphy, CambridgeUniversity Press. v. 1, p.
Carannante, G., Ruberti, D. & Sirna, M., 2000- Upper Cretaceous ramp limestones from the SorrentoPeninsula (Southern Apennines, Italy): micro-and macrofossil associations and their significance in the depositional sequences: Sedimentary Geology, v. 132, p. 89-123.
Cestari, R. & Sartorio, D., 1995- Rudists and facies of the Periadriatic domain.-207Pls., many microphotographs, Milano (Agip), Early and Late Cretaceous. E, F, PD
Colin, J. P., Vaziri-Moghaddam, H., Safari, A. & Shahriari Graii, S., 2010- Presence of the genus Frambocythere Colin, 1980, Ostracoda (Lilmnocytheridae, Timiriaseviiinae) in the Upper Maastrichtian of the Zagros Mountains, Iran, a new relay betewen southern Europe and the Far East.- In; Benzarti-Said, R. (Edits.), Programme et résumés des communications. - ROLF 23, 23ème Réunion des Ostracodologistes de Langue Française (Tunis, 6-8-Mai, 2010). Serept, Tunis: 27-28.
Douville, H., 1910- Etudes sur les rudistes. Rudistes de Sicile, d’ Algerie, d’Egypte, du Liban et de la Perse: Memoires de la Societe Geologique deFrance 41, p. 1-83.
Elliott, G. F., 1991- Dasycladacean algae of the Palaeozoic and Mesozoic, In: Riding, R. (ed.), Calcareous algae and stromatolites, Springer, p. 125-130.
Flugel, E., 2004- Microfacies of carbonate rocks, Springer-Verlag Berlin Heidelberg Germany, 976p.
Gili, E., Masse, J. P. & Skelton, P. W., 1995- Rudists as gregarious sediment dwellers, not reef-builders, on Cretaceous carbonate platforms. Palaeogeography, Palaeoclimatology, Palaeoecology 118, p. 245-267.
Hart, M. B. & Carter, D. J., 1975- Some observations on the Cretaceous Foraminiferida of south-east England. J. Foramin. Res. 2, p. 14-34.
Hottinger, L., 1983- Processes determining the distribution of larger foraminifera in space and time: Utrecht Micropaleontological Bulletin, v. 30, p. 239-253.
Hottinger, L., 1997- Shallow benthic foraminiferal assemblages as signals for depth of their deposition and their limitation: Bull. Soc. Geol. France, v. 168, p. 491-505.
James, G. A. & Wynd, J. G., 1965- Stratigraphic nomenclature of Iranian oil consortium agreement area: American Association Petroleum Geology Bulletin, v. 49, p. 2182-2245.
Khazaei, A. R., Skelton, P. W. and Yazdi, M., 2010- Maastrichtian Rudist fauna from Tarbur formation (Zagros region-SW Iran), Preliminary observations: Turkish Journal of Earth Sciences, v.19, p.703-719.
Kühn, O., 1932- Rudistae from eastern Persia: Records of the Geological Survey of India, v. 46, p. 151-179.
Meric, E., 1967- An aspect of Omphalocyvlus macroporus (Lamarck). Micropaleontology 13, p. 369-380.
Meric, E., Ersoy, S. & Gormus, M., 2001- Palaeogeographical distribution of the species of Loftusia (Foramin iferida) in the TethyanOcean during the Maastrichtian (Late Cretaceous): Cretaceous Research, v. 22, p. 353-364.
Moro, A., Skelton, P. W. & Cosovic, V., 2002- Palaeoenvironmental setting of Rudists in the Upper Cretaceous (Turonian-Maastrichtian) Adriatic carbonate platform (Croatia), based on sequence stratigraphy: Cretaceous Research, v. 23, p. 489-50.
Morris, N. J. & Skelton, P. W., 1995- Late Campanian - Maastrichtian rudists from the United Arab Emirates - Oman border region: Bulletin of the BritishMuseum (Natural History), Geology Series, v. 51, p. 277-305.
Ogg, J. G., 2004- Geologic time scale, Late Cretaceous (65-100 Ma time-slices), Cambridge Univ. Press.
Ozcan, E. & Ozkan-Altiner, S., 1999- The genus Lepidorbitoides and Orbitoides: evolution and stratigraphic significance in some Anatolian Basins. Geological Journal 34, p. 275-286.
Ozcan, E. & Ozkan-Altiner, S., 2001- Description of an early ontogenetic evolutionary step in Lepidorbitoides: Lepidorbitoides bisambergensis asymmetrica spp. Nov., Early Maastrichtian (Turkey). Rivista Italiana di Paleontologia e Stratigrafia 107, p. 137-144.
Ozcan, E., 2007- Morphometric analysis of the genus Omphalocyclus from the Late Cretaceous of Turkey: new data on its stratigraphic distribution in Mediterranean Tethys and description of two new taxa. Cretaceous Research 28, p. 621-641.
Özer, S., Sarı, B. & Önal, M., 2008- Campanian-Maastrichtian rudist-bearing mixed siliciclastic-carbonate transgressive-regressive system tracts of the eastern and southeastern Anatolia: faunal correlation, depositional facies and palaeobiogeographic significance. Eighth International Congress on Rudists, İzmir-Turkey, Pre-meeting Field Trip (1) Excursion Guide, 1-28.
Pedley, H. M. & Carannante, G., 2006- Cool-Water Carbonates: Depositional systems and palaeo-environmental controls, Geological Society, London, Special publications 255, p. 1-9.
Pons, J. M., Schröeder, J. H., Hofling, R. & Moussavian, E., 1992- Upper Cretaceous rudist assemblages in Northern Somalia: Geologica Romana, v. 28, p. 219-242.
Rahaghi, A., 1976- Contribution and I etude de quelques grands foraminifers de I Iran, Parts 1-3. Societe National Iranienne des Petroles, Publication no.6, p. 1-79.
Reiss, Z. & Hottinger, L., 1984- The Gulf of Aqaba. Ecological micropaleontology, Ecological Studies 50, Springer Verlag, Berlin, 354 p.
Ross, D. J. & Skelton, P. W., 1993- Rudist formation of the Cretaceous: a Paleoecological, Sedimentological and Stratigraphical review In: Wright V.P., Sedimentology Review: Blackwell Sc. Pub. Oxford, v. 1, p. 73-91.
Ruberti, D., Carannante, G., Simone, L. & Toscano, F., 2006- Rudist lithosomes related to current pathwaysin Upper Cretaceous, temperate-type
Sadooni, F. N. & Aqrawi, A. A. M., 2000- Cretaceous sequence stratigraphy and petroleum potentional of the MesopotamianBasin, Iraq. In: Scott, B., Alsharhan, A.S. (Eds.), Middle East models of Jurassic/Cretaceous carbonate systems. SEPM Special publication 69, p. 315-334.
Sadooni, F. N., 1993- Stratigraphic sequence, microfacies and petroleum prospects of the Yamama Formation, Lower Cretaceous, southern Iraq. American Association of Petroleum Geologists, Bulletin 71, p. 1971-1988.
Sanders, D. & Baron-Szabo, R., 1997- Coral-rudist bioconstructions in the Upper Cretaceous Haidach section (Northern Calcareous Alps, Austria), Facies 36, p. 69-90.
Sanders, D. & Pons, J. M., 1999- Rudist formations in mixed siliciclastic-carbonate depositional environments, Upper Cretaceous, Austria: stratigraphy, sedimentology and models of development, Palaeogeography, Palaeoclimatology, Palaeoecology, v. 148, p. 249-284.
Skelton, P. W., 1991- Morphogenetic versus envaironmental cues for adaptive radiations. In: N., Schmidt-Kittler and K., Vogel (Editors), Constructional Morphology and Evolution. Springer, Berlin, p. 375-388.
Steuber, T. & Loser, H., 2000- Species richness and abundance patterns of Tethyan Cretaceous rudist bivalves (Mollusca: Hippuritacea) in the central-eastern Mediterranean and Middle East analysed from a palaeontological data base. Palaeogeography, Palaeoclimatology, Palaeoecology, v. 162, p. 75-104.
Van der Zwaan, G. J., Duijnstee, I. A. P., Den Dulk, M., Ernst, S. R., Jannink, N. T. & Kouwenhoven, T. J., 1999- Benthic foraminifers: proxies of problems? A review of palaeoecological concepts, Earth-Science Reviews 46, p. 213-236.
Van Gorsel, J. T., 1978- Late Cretaceous orbitoidal foraminifera. In: Hedley, R.H., Adams, C.G. (Eds.), Foraminifera. Academic Press, London, p. 1-120.
Van Hinte, J. E., 1965- An approach to Orbitoides. Proceedings, Koninklijke Nederlandes Akademie van Wetenschappen, Amsterdam, Series B 68, p. 57-70.
Vaziri Moghaddam, H., Safari, A. & Taheri, A., 2005- Microfacies, Paleoenvironments and Sequence stratigraphy of the Tarbur Formation in Kerameh area, SW Iran, Carbonates and Evaporites, v. 20, p. 131-137.
Verga, D. & Rettori, R., 2004- International school on planktonic Foraminifera, Universities of Perugia & Milano, 283p.
Widmark, J. G. V., 1997- Deep-sea benthic foraminifera from Cretaceous-Tertiary boundary strata in the south Atlantic ocean, Taxonomy and Paleoecology, Fossils & Strata 43, p. 1-94.
Zhicheng, Z., Willems, H. & Binggao, Z., 1999- Marine Cretaceous-Paleogene biofacies and ichnofacies in southern Tibet, China, and their sedimentary significance. Marine Micropaleontology, 32: 3-29.