Vol.2 – 1996 – No.2

Larger ostracoda in the sea of Marmara: general distribution of Bosquetina dentata (G.W. Muller, 1894)

Cemal Tunoğlu

Hacettepe University, Geological Engin. Dept. 06532, Beytepe, Ankara, TURKEY

Abstract

Bosquetina dentata (G.W.Müller, 1894) is a benthic ostracoda specimen which has larger dimensions than the other ostracoda species of the Sea of Marmara. This species is known very common in all around of the Mediterranean. B. dentata are found and observed generally shallow-circolittoral but fairly deep-marine in the sea of Marmara.

Keywords: Ostracoda, Bosquetina dentata, sea of Marmara, recent, Turkey

General distribution of Pterigocythereis jonesii (Baird, 1850) and Pterigocythereis ceratoptera (Bosquet, 1852) (Ostracoda) in the sea of Marmara

Cemal Tunoğlu

Hacettepe University, Geological Engineering Departmen,. 06532 Beytepe, Ankara, TURKEY

Abstract

Genus Pterigocythereis and related species are known all around of the Mediterranean recently. Pterigocythereis jonesii and P. ceratoptera are important species which they observed for the first time with this study in the benthic ostracoda thanatocoenosis and biocoenosis of the Sea of Marmara. These species have been found in all of the locations of shallow water at depths between 20-60 m. and especially in near-shore throughout the Sea of Marmara coasts. Their habitat are exist different types of substrate, but they prefer commonly on sandy mud and silty mud bottom sediments.

Keywords: Ostracoda, Pterigocythereis, Sea of Marmara

References

Aranki. J.F. (1987). Marine Lower Pliocene ostracoda of southern Spain with notes on the recent fauna. Publications from the Paleontological Institution of The Universty of Upsala, p. 94.

Baird. W. (1850). Description of several new species of Entomostraca, Proceedings of the Zoological Society of London, 18, 254-257.

Bonaduce, G. Ciampo, G., Masoli, M., (1975). Distribution of ostracoda in the Adriatic Sea. Publicazioni della Stazione Zoologica d. Napoli, v.40, Sup.!, p.l54

Hartmann. G. & Puri, H., (1974). Summary of Neontological and Paleontological Classification of Ostracoda. Mitt. Hamburg Zool. Mus. Inst., 70:7-73.

Guernet C. (1990). Evolution of the genus Pterigocythereis BLAKE, 1933 (ostracode). from Cretaceous to Recent, Revue de Micropaleontologie, .33/3-4:, .279-293

Keurs, D. (1971). Development of ostracoda and foraminifera assemblages in transgressive /regressive sequences. “A paleontological investigation of the post glacial Rhone Delta complex” Paleoecologic ostracodes Pau, 1970, (Oertli, ed.), Bull. Centre Rech. Pan. SNPA. 5 suppl., 257-283.

Nazik. A. (1996). Environmental interpretation of Quaternary sediments: Küçüksu Palace (Asiatic Side of the istanbul Bosphoms, Turkey, 3^rd European Ostracodologists Meeting-Paris-Bierville. July 8-12th. Abstracts, p.54.

Oertli. H.J. (De.). (1985). Atlas des Osracodes de France. Memories Elf-Aquitaine, 9, p. 396 Pan.

Sars. G.O. (1928). An account of the Crustacea of Norway, volume. IX: Ostracoda, Bergen Museum, pp. 277.

Sissingh. W. (1972). Late Cenozoic ostracoda of the South Aegean Island Arc, Utrecht Micropaleontological Bulletins, p. 187.

Stancheva, M. (1963). Ostracoda from the Neogene in North-Western Bulgaria, I. Tortonian Ostracoda, Academie des Sciences de Bulgaria, Serie Paleontologie KH. V, 1-75.

Tunoğlu, C. (1996). Recent Ostracoda Association In The Sea Of Marmara. NW Turkey, 3^rd European Ostracodologists Meeting- Paris-Bierville, july 8-12th, Abstracts, p. 78.

Yassini, I, (1979). The littoral system ostracodes from the Bay of Bou-Ismail, Algiers, Algeria, Revista, Espanola, de Micropaleontologia, 11: 3, 353-416

Zorn, l. (1995). Preliminary report on the ostracodes from the Ottnangian(Early Miocene) of Upper Austria, Ostracoda and Biostratigraphy, (Riha ed.), pp. 237-243 Belkema Rotterdam.

 

 

Extents of the North Anatolian Fault in the Izmit, Gemlik, and Bandırma Bays

Aykut Barka, Ismail Kusçu

ITU, Faculty of Mining Department of Geology, Ayazağa, Istanbul, TURKEY
MTA, Ankara, TURKEY

Abstract

High resolution shallow seismic reflection profiles, surveyed by MTA Sismik-1 in the Izmit, Gemlik and Bandmna bays, in 1984, were re-examined in order to understand geometry and kinematics of the northern and middle strands of the North Anatolian Fault. We used the pull-apart model to detect the course of the strands. We concluded that this approach fits well with the fault patterns and all three strands seems to have identical fault geometry and kinematics. GPS measurements geomorphology, bathimetry and tickness of sediment in the basins, and historical earthquake records in the eastern Marmara Sea region show that slip rate is higher along the northern strand than the middle strand suggesting higher earthquake risk along the northern strand of the North Anatolian Fault.

Keyword: Shallow seismic reflection profiles, lzmit, Gemlik and Bandırma Bays

References

Akartuna, M. (1968). Armutlu yarımadasının Jeolojisi, Ist. Üni. Fen Fak. Monog. 20, 105pp.

Akgün, M. (1987). lzmit Körfezinin jeofizik yöntemlerle incelenmesi. MSc. Thesis, DEU, lzmir.

Akgün, M. and Ergün, M. (1995). İzmit Korfezinin yap1s1 ve Kuzey Anadolu fayı (KAF) ile ilişkisinin irdelenmesi. Jeofizik, 9: 1-2, 71-78.

Ambraseys, N. N. and Finkel, C. F. (1991). Long-term seismicity of İstanbul and of the Marmara region. Engin. Seis. Earthq. Engin.Report 91/8, Imperial College.

Barka, A. A., (1991). İstanbul’un Depremselliğini oluşturan tektonik yapılar ve İstanbul için bir mikro-bölgelendirme denemesi. “İstanbul ve Deprem Sempozyumu” lnşaat Müh. Odası.

Barka, A. A. and Kadinsky-Cade, K. (1988). Strike-slip fault geometry in Turkey and its influence on earthquake activity. Tectonics, 7: 663-684.

Barka, A. A. and Gülen, L. (1988). New constraints on age and total offset of the North Anatolian Fault Zone: Implications for tectonics of the eastern Mediterranean region. Spec. Publ. Middle-East Techn. Univ. Ankara, Turkey.

Barka, A. A. (1992). The North Anatolian Fault. Annales Tectonicae, 6: 164-195.

Barka, A. A. (1993). Kuzey Anadolu Fayının Sapanca- İzmit ve Geyve- İznik Kolları Üzerinde Paleosismik Araştırmalar. Proje No: YBAG-4/7551.

Crampin, S. and Evans, R., and Üçer, B. (1985). Analysis of records of local earthquakes: Turkish dilatency project. Geophys. J. R. Astr. Soc. 83: 1-16.

Crampin, S., Evans, R., (1986). Neotectonics of the Marmara Sea region of Turkey. J. Geol. Soc. London, 143: 343-346.

Ergün, M. and Özel, E. (1995). Structural relationship between the sea of Marmara basin and the North Anatolian Fault. Terra Nova, 7: 278-288.

Honkura, Y. and Işıkara, A.M. (1991). Multidisciplinary research on fault activity in the western part of the North Anatolian Fault Zone. Tectonophysics, 193:347-357.

Kavukçu, S. (1990). Active fault investigation in lzmit Bay, Bandırma Bay and Erdek Bay of Marmara Sea. Proceedings ” Historical seismicity and seismotectonics of the Mediterranean region”, Turkish Atomic Energy Authority. 238-266.

Koral, H. and Öncel, A. O. (1995). İzmit körfezinin yapısal ve sismolojik özellikleri. Jeofizik 9: 1-2, 79-82.

Kurtuluş, C. (1985). Gemlik Körfezi yüksek ayrımlı sığ sismik etüdü raporu. MTA, Jeofizik Etüdler Dairesi. 735, 6 pp.

Özhan, G., Kavukçu, S., Çete, M., Kurtuluş, C. (1985). Marmara Denizi İzmit Korfezi, yüksek ayrımlı sığ sismik etüdü raporu. MTA, Jeofizik Etüdler Dairesi.

Sakınç, M. and Bargu, S. (1989). İzmit körfezi güneyindeki Geç Pleyistosen (Tireniyen) çökel stratigrafisi ve bölgenin neotektonik özellikleri. TJK Bült. 32: 51- 64.

Şaroğlu, F., Boray, A. and Emre, O. (1987). Active faults of Turkey. Mineral Res. Explor. lnst. Turkey. Unpubl. Report 8643, 394 pp.

Straub, C. (1996). Recent crustal deformation and strain accumulation in the Marmara Sea region, NW Anatolia in ferred from GPS Measurements. PhD Thesis, ETH, 122pp.

Tsukuda, E., Herece, E. and Kuşçu, I. (1988). Some geological evidence on activity of the western North Anatolian Fault, Geyve, İznik, Gemlik area. ITIT project 8513, 68-91.

Wong, H. K., Lüdman, T., Uluğ, A., Görür, N. (1995). The sea of Marmara: a plate boundary sea in an escape tectonic regime. Tectonophysics. 244: 231-250.

Yoshioka, T. and Kuşçu, İ. (1994). Late Holosen faulting events on the İznik-Mekece fault in the western part of the North Anatolian Fault Zone, Turkey. Bull. Geol. Surv. Japan, 45: 677-685.

Late quarternary depositional environments on the southern Marmara shelf

Mustafa Ergin, Nizamettin Kazancı, Baki Varol, Özden Ileri, Levent Karadenizli

Ankara University, Faculty of Sciences, Department of Geological Engineering, Tandoğan, 06100 Ankara, TURKEY

Abstract

In this study, 182 surficial sediment samples have been used to investigate the characteristics of sedimentary depositional environments on the southern Marmara shelf. Grain size analyses revealed the presence of, at least, three distinct depositional zones where sediments contained relatively high sand and gravel components partly derived from the remains of benthic organisms. Zone 1 extends from the Bozburun Peninsula in the east to the west off Imralı Island in the west. Zone 2 extends from the east off Marmara Island to the east off Kapıdağ Peninsula. Zone 3 extends from west of Marmara Island towards southwest. The sediments of these three zones grade into fine-grained mud both in nearshore and offshore directions. The presence of ridge-like and high bottom reliefs, based on bathymetric profiles, further suggest that these zones could be relict features such as former shorelines resulted from the last sea-level changes. Due to lack of data, possible influences of neotectonics remain questionable. Zone 3 seems to be controlled by a complex of mechanisms. Further investigations are underway.

Keywords: Sediment, southern Marmara shelf, carbonat contents, grain size

References

Algan, I.M. and Akbulut, A.O.(l985) Some sedimentological characteristics of submarine deposits at the mouth of Kocasu River. Bull. Ins/. Mar. Sci. Geogr., Istanbul Univ., 2:145-154 (in Turkish).

Bodur, M.N. and Ergin,M. (1994) Geochemical characteristics of the recent sediments from the Sea of Marmara. Chemical Geology,115:73-101.

Ergin, M.,Bodur, M.N. and Ediger, V. (1991). Distribution of surficial shelf sediments in the northeastern and southwestern parts of the Sea of Marmara: Strait and canyon regimes of the Dardanelles and Bosphorus. Marine Geology,96:313- 340.

Ergin, M., Bodur, M.N., Ediger,D., Ediger,V. and Yılmaz,A. (1993) Organic carbon distribution in the surface sediments of the Sea of Marmara and its control by the inflows from adjacent water masses. Marine Chemistry,41 :311-326.

Ergin, M. (1994) Possible sources and mechanisms of manganese enrichment in the deep-sea sediments of the Marmara through depressions (NE-Mediterranean, Turkey). Oceanologica Acta, 17:535-546.

Ergin, M., Bodur, M.N., Yıldız, M., Ediger, D., Ediger, V., Yemenicioğlu, S. and Eryılmaz-Yücesoy, F. (1994) Sedimentation rates in the Sea of Marmara: a comparison of results based on organic carbon-primary productivity and 210Pb dating. Continental Shelf Research, 14:1371-1387.

Kazancı, N., Ergin, M., Varol, B., İleri, Ö., Karadenizli, L. (1996) Sedimentological studies of the surface sediments from the southern shelf of the Sea of Marmara. In:Proceedings of the Workshop-1 on National Marine Geological and Geophysical Programme of TÜBİTAK-Üniversitesi-MTA, İstanbul,98-10 1,8-9 February 1996.

 

Distribution of carbonate and organic carbon contents in late quaternary sediments of the southern Marmara shelf

M. Namık Çağatay, Oya Algan, Nuray Balkıs, Mehmet Balkıs

Institute of Marine Sciences and Management, University of Istanbul, Istanbul, TURKEY

Abstract

A total of 165 surface and 81 core samples from four gravity cores were analyzed for their total carbonate and organic carbon contents. The sediments are generally low in carbonate content (<10% CaCO₃) along the inner shelf. Relatively higher values (>10% CaCO₃) are found on the outer shelf to the north, along a belt extending from the Bozburun Peninsula to west of Mamara Island. Patches of >20% CaCO₃ values occur between the lmralı Island and Bozburun Peninsula, NE of the Kapıdağ Peninsula, and in a belt extending west from the Kapıdağ Peninsula, through the Avşa Island to Karabiga. The high carbonate areas generally correspond to the sandy sediments with high contents of shell material. Total organic carbon content of the surface sediments ranges from 0.10-2.50%, with the high values being located in shallow areas along the coast and decreasing values occuring in the offshore direction. This distribution pattern suggests that the organic-carbon matter is mainly of terrestrial origin. Depth profiles of organic carbon values along the core samples indicate the presence of a sapropel layer in two cores (No.22 and 13) in the Gemlik Gulf. The highest carbonate (8-12% CaCO₃) and organic carbon values (1.7-2.11%) are found in a phosphorescent green, plastic, clayey sapropelic mud horizon at a depth ranging from 1. 75 to 2. 15 m. This layer is enriched in planktonic foraminifera but depleted in benthic foraminifera species, suggesting both the high surface organic productivity and bottom unoxic conditions. It was probably deposited following the Holocene transgression during a pluival period when increased quantities of nutrients were supplied by rivers into the Sea of Marmara and when water stratification was established. Radiometric carbon, organic and isotope geochemical studies are in progress on this layer.

Keywords: Sea of Marmara, quaternary sediments, sapropels, organic carbon, total carbonate

References

Anastasakis, G. C., and Stanley, D.J., (1984). Sapropel and Organic-rich variants in the Mediterranean: Sequence, development and classification. In: Fine-Grained Sediments, Deep-Water Processes and Facies (Stow DAV. Piper DJW eds). Blackwell Scientific Publication, London, pp 104-510.

Calvert, S. E., (1983). Geochemistry of Pleistocene sapropels and associated sediments from the Eastern Mediterranean. Oceanologica Acta, 6:255-267.

Calvert, S. E., (1990). Geochemistry and origin of the Holocene sapropel in the Black Sea, In Facts of modern biogeochemistry (V. lttekkot, ed.) Berlin, Springer-Verlag, pp. 327-353.

Calvert, S. E., Nielsen, B., and Fontugne, M. R., (1992). Evidence from nitrogen isotope ratios for enhanced productivity during formation of eastern Mediterranean sapropels. Nature, 359:223-225.

Cita, M. B., Vergnaud – Grazzini, C., Robert, C., Chamley, H., Ciaranti, N. and Donofrio, S., (1977). Paleoclimatic record of long deep-sea core from the eastern Mediterranean. Quaternary Research, 8: 205-235.

Demaison, G. J. and Moore, G. T., (1980). Anoxic environments and oil source bed genesis. Organic Geochemistry, 2: 9-31.

Degens, E. T., and Ross, D. A., (1974). The Black Sea-geology, chemistry and biology. AAPG Memoir, V. 20, p. 633.

Emeis, K-C., Zhan, R., and ODP legs 160 and 161 shipboard scientific party, (1996). Sapropels, Mediterranean climate, and oceanography since the Miocene. ODP First Euro Colloquium, Oldenburg, p.2.

Ergin, M.N., Bodur, M.N., Ediger, D., Ediger, V., and Yılmaz, A., (1993). Organic carbon distribution in the surface sediments of the Sea of Marmara and its control by the inflows fro adjacent water masses. Marine Chemistry, 41: 311-326.

Gaudette, H., Flight, W., Tones, L. and Folger, D. (1974). An expensive titration method for the determination of organic carbon in recent sediments. J. Sedimentary Petrology, 44:249-253.

Jorisson, F. J., et al., (1993). Late Quarternary central Mediterranean biochronology. Mar. Micropaleontology, V. 21, pp. 169-189.

Kazancı, N., Ergin, M., Varol, B., İleri, Ö. and Karadenizli, L., (1996). Marmara Denizi güney kıta sahanlığının yüzey sedimentlerinin sedimentolojik incelenmesi. TÜBİTAK, Üniversite-MTA Ulusal Deniz Jeolojisi ve Jeofiziği Programı Workshop-1, s. 98-10 I. 8-9 Şubat 1966, İstanbul.

Kidd, R. B., Cita, M. B., and Ryan, W. B. F., (1978). Stratigraphy of eastern Mediterranean sapropel sequences recovered during DSDP leg 42A and their paleoenvironmental significance. In: Init. Reps., (Hsu, K. J., Montadert, L., et al.,) DSDP, 42: 421-443.

Loring, D.H. and Rantala, R.T.T., (1992). Manual for the geochemical analyses of marine sediments and suspended particulate matter. Earth-Science Reviews, 32:235- 283.

Müller, P. J. and Suess, E. (1979). Productivity, sedimentation rate, and sedimentary organic matter in the oceans – I. Organic carbon preservation. Deep-Sea Res. 26A, 1347-1362.

Pedersen, T. F., and Calvert, S. E., (1990). Anoxia vs. Productivity: What controls the formation of organic -carbon- rich sediments and sedimentary rocks. AAPG Bull., V. 74, pp. 454-466.

Rohling, E. J., (1994). Review and new aspects concerning the formation of eastern Mediterranean sapropels, (1994). Marine Geology, 122: 128.

Schrader, H. and Maderne, A., (1981). Sapropel formation in the eastern Mediterranean: evidence from preserved opal assemblages. Micropaleontology, 27: 191-203.

Shaw, H. F. and Evans, G., (1984). The nature, distribution and origin of a sapropelic layer in sediments of the Cilicia basin, northeastern Mediterranean, Marine Geology, V.61, pp. 1-12.

Stanley, D.J. and Blanpied, C. (1980) Late Quaternary water exchange between the eastern Mediterranean and the Black Sea. Nature, 285:537-541.

Stanley, D. J., Maldonado, A. and Stuckenrath, R., (1975). Strait of Sciliy depositional rates and patterns and possible reversal currents in the late quarternary. Palaeogeogr., Palaeoclimatol, Palaeoecol., 18: 279-291.

Thunell, R. C., and Williams, D. F., (1989). Glacial-Holocene salinity changes in the Mediterranean Sea: hydrographic and depositional effects. Nature, Vol. 338, p. 493- 496.

Ünlüata, Ü., Oğuz, T., Latif, M.A. and Özsoy, E. (1990), The physical oceanography of the Turkish Straits. In The Physical Oceanography of Sea Straits. (L.J. Pratt ed.), Kluver, Dordrecht, pp. 25-60.

Ünlüata, Ü. and Özsoy, E. (1986), Oceanography of the Turkish Straits: health of the Turkish Straits: I. Oxygen deficiency of the Sea of Marmara. Rep. Ins. Marine Sci., METU, Erdemli, İçel, pp. 88.

Ünsal, M and Uysal, Z., (1988). Planktic and benthic invertebrates of the Bosphorus -Marmara junction. Rep. Ins. Marine Sci., METU, Erdemli, İçel, pp. 53.

Yılmaz, A. (1986). The origin and the nature of humic substances in the marine environment. Ph. D. Thesis, lnst. Mar. Sci., METU, Erdemli, İçel, 142 pp.