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8Th International Symposium on the Cretaceous System Abstract Volume v E H „ 8th International Symposium on the Cretaceous System CI 4- Convenors: Malcolm B. Hart and Gregory D. Price The Geological Society The MtcropalaeontcHogtcal Society M jftex SIRAIIGHAPHIC CONSULTING LIMITED ProceiXlings of th«* Geolog isl s 'Assoc! ation Published by ElttvUr» from 2009 PES 4 Abstract Volume Edited by Malcolm B. Hart 8th International Symposium on the Cretaceous System University of Plymouth 6th- 12th September 2009 Abstract Volume Editor: Malcolm B. Hart Organisation of the 8 International Symposium on the Cretaceous System Conveners: Malcolm B. Hart and Gregory D. Price Symposium Secretariat: Samantha Davis, Kevin Chappie and Clare Parkinson Secretary: Sally Greenwood Webmaster: Paul Dowland Editor of the Abstract Volume: Malcolm B. Hart Production of Documentation: Lizz Score and Document Production Centre of the University of Plymouth Sponsors: The Geological Society of London The Micropalaeontological Society Palaeontological Association Neftex Petroleum Consultants Ltd Network Stratigraphic Consulting Ltd Shell Exploration and Production Ltd Petroleum Exploration Society of Great Britain Proceedings of the Geologists' Association (Elsevier) University of Plymouth ISBN: 978-1-84102-233-8 Hart, M.B. (Ed.), 8th International Symposium on the Cretaceous System, 6th - 12th September, 2009, Abstract Volume. 2 Cretaceous climatic oscillations in the southern palaeolatitudes: new stable isotope evidence from India and Madagascar [790] Zakharov, Y.D.1, Shigeta, Y.2, Nagendra, R.3, Safronov, P.P.1, Smyshlyaeva, O.P.1, Popov, A.M.1, Velivetskaya, T.A.1 & Afanasyeva, T.B.1 1 Far Eastern Geological Institute of Russian Academy of Sciences (Far Eastern Branch), Prospect Stoletiya 159, Vladivostok 690022, Russia 2Geology and Palaeontology, National Museum of Nature and Science, Shinjuku-ku, Tokyo 169-0073, Japan 3Department of Geology, Anna University, Chennai, India e-mail: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected] Palaeotemperatures for the Cretaceous of India and Madagascar have been determined on the basis of oxygen isotopic analysis of well-preserved Albian belemnite Actinocamax (Praeactinocamax) sp. rostra and the shells of Maastrichtian bivalves Lopha sp. and Gryphaea sp. from the Cauvery Basin, southern India, and Albian cephalopods shells (Cymatoceras? sp., Cleoniceras cleon (d'Orbigny), Eotetragonites sp., Desmoceras sp., and Douvilleiceras mammilatum Schlotheim) from the Mahajanga Basin, Madagascar. The Albian (possibly Late Albian) palaeotemperatures for the Cauvery Basin are inferred to range from 14.9°C to 18.5°C for the epipelagic zone and from 14.3°C to 15.9°C for the mesopelagic zone, based on analysis of 65 samples; isotopic palaeotemperatures interpreted as summer and winter values for near-bottom shelf waters in this area fluctuate from 16.3 to 18.5°C and from 14.9 to 16.1°C, respectively. The mentioned palaeotemperatures are similar with those calculated from isotopic composition of middle Albian belemnites of the middle latitude area of Pas de Calais in Northern hemisphere (Zakharov ef a/., 2006), but lower than those calculated from mainly Cenomanian-Turoniah benthic foraminifera from the Cauvery Basin (Gupta ef a/., 2007); the latter seems to be connected with increasing of global warming in the beginning of the Late Cretaceous. However, Albian palaeotemperatures for India are significantly higher than those calculated from isotopic composition of Early Albian belemnites from Lago San Martin (southern Argentina) and James Ross (Antarctic) and middle Albian belemnites of Carnarvon (Australia) (Pirrie et ai, 2004) located within the warm-temperate climatic zone in southern high latitudes. Isotopic analysis of early Albian cephalopods from Madagascar, based on analysis of 55 samples, shows somewhat higher summer palaeotemperatures for near-bottom shelf waters in this area (20.2-21.6°C) in comparison with those obtained for southern India, but similar winter values (13.3-16.4°C); at the same time the latter values are somewhat higher than those calculated from Early Albian ammonoid and brachiopod shells of the tropical-subtropical climatic zone of northern high latitudes (Southern Alaska and Koryak Upland). The new isotopic palaeotemperature data suggest that southern India and Madagascar were located apparently in middle latitudes, but within the tropical-subtropical climatic zone during Albian time. In contrast to the Albian fossils, isotope results of well-preserved Early Maastrichtian bivalve shells from the Ariyalur Group, Cauvery Basin, are characterized by low 6180 values (up to -5.8%o) but 'normal' 513C values (observation from 38 samples), which might be a result of the marine environment, having a local fresh-water input. Our isotopic records show that the Early Maastrichtian palaeotemperature of the southern Indian near-bottom shelf waters was probably about 21.2°C, and that this middle latitude region continued to be a part of tropical-subtropical climatic zone, but with tendency of increasing of humidity at the end of Cretaceous time. This research was carried out with the financial support of FEB RAS grant 09-III-A-08-402, Russia. Gupta, K.D., Saraswati, P.K., Kramar, U., Ravindran, N., Stuben, D. & Ravindran, C.N. 2007. Oxygen isotopic composition of Albian-Turonian foraminifera from the Cauvery Basin, India: evidence of warm sea-surface temperature. Journal of the Geological Society of India, 69, 390-396. Pirrie, D., Marshall, J.D., Doyle, P. & Riccardi, A.C. 2004. Cool early Albian climates; new data from Argentina. Cretaceous Research, 25, 27-33. Zakharov, Y.D., Smyshlyaeva, O.P., Popov, A.M. & Shigeta, Y. 2006. Isotopic composition of Late Mesozoic organogenic carbonates of Far East (Oxygen and carbon isotopes, palaeoclimatic events and their global correlation). Izdatel'stvo "Dalnauka", Vladivostok, 204pp, [in Russian]. 3 Cenomanian-Turonian ammonite correlations between the African Southern Tethys and the South Atlantic via the Transsaharian sea [802] Meister, C.1 &Abdallah, H.2 1 Museum d'Histoire Naturelle de Geneve, CP. 6434, Route de Malagnou 1, CH-1211, Geneve 6, Switzerland 2Laboratoire de Geoenergie, Technopole Borj Cedria, B.P. 95, Hamman-Lif, 2050 Tunis, Tunisia e-mail: [email protected]; [email protected] a) The ammonite succession for the Cenomanian-Turonian becomes more and more precise for the African Southern Tethys (e.g., Tunisia, Morocco), but several gaps remain at least at the stage boundary. Moreover numereous zonations are proposed in the literature with mostly a regional meaning and different time-interval interpretations. It generates a lack of stability of the zonal nomenclature. Herein the purpose is to propose a biostratigraphical synthesis from North Africa to Angola and throughout the Saharian regions and to make correlations with the Western Interior where the GSSP of the Turanian has been defined. Notice that the major part of the Southern Tethyan taxa are not present in the stratotype and their time-ranges remain not well known. This makes correlation sometimes very hypothetical. b) The marine transgression on the African Craton starts around the late Cenomanian. During this period we can follow and date precisely the extension of the sea with the Neolobites vibrayeanus event. The Tethys - Atlantic marine connection via the Benoue trough could correspond to 2 distinct periods. The first one is doubtful and corresponds to a period of homogenization of the fauna with some Vascoceras here and there of the High and Low Benoue. The age matches with the upper part of the Upper Cenomanian during the Vascoceras gamai and Vascoceras cauvini events at the middle part of the N. judii Zone, maybe starting with the Pseudaspidoceras pseudonodosoides event at the base of the N. judii Zone. The second episod of marine connection is better understood and matches to a short event in the Lower Turanian corresponding to the Pseudotissotia nigeriensis and Wrightoceras wallsi events (upper W. coloradoense Zone).The absence of ammonite information in Low Benoue during the C. guerangeri and M. geslinianum Zones and during the uppermost Cenomanian and lowermost Turanian in Saharian Algeria and Niger suggest rather periods of no connection between Tethys and South Atlantic via the African seaway for these time-intervals. Courville, P., Meister, C, Lang, J., Mathey, B. & Thierry, J. 1991. Les correlations en Tethys occidentale et I'hypothese de la liaison Tethys-Atlantique Sud, interet des faunes d'ammonites du Cenomanien superieur-Turonien inferieur du Niger et du Nigeria (Afrique de I'Ouest). Comptes Rendus de I'Academie des Sciences, 313 (II), 1039-1042. Meister, C. & Abdallah H. 2005. Precision sur les successions d'ammonites du Cenomanien - Turonien dans la region de Gafsa, Tunisie du centre-sud. Revue de Paleobiologie, 24, 1, 111- 199. Meister, C, Alzouma, K., Lang, J. & Mathey, B. 1992. Les ammonites du Niger (Afrique occidentale) et la transgression transsaharienne au cours du Cenomanien - Turonien. Geobios, 25, 1, 55- 100. Meister, C, Alzouma, K., Lang, J., Mathey, B. & Pascal, A. 1994. Nouvelles donnees sur les ammonites du Niger (Tenere, Afrique occidentale) dans le cadre de la transgression du Cenomanien - Turonien. Geobios, 27, 2, 189-219. Meister, C, M'Bina Mounguengui, M. & Lang, J. 2003. Les ammonites du Cenomano-Turonien du bassin cotier nord-gabonais: systematique et interet paleogeographique pour la liaison
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