A potential stratotype for the Oxfordian/Kimmeridgian boundary: Staffin Bay, Isle of Skye, UK

• Autorzy: Wierzbowski A. , Coe A. , Hounslow M. , Matyja B. , Ogg J. , Page K. , Wierzbowski H. , Wright J.
• Języki publikacji: EN

Abstrakty

EN

A coastal exposure of the Staffin Shale Formation at Flodigarry, Staffin Bay, Isle of Skye, Scotland, UK fulfils the criteria for definition as the Global Stratotype Section and Point (GSSP) for the base of the Kimmeridgian Stage (Upper Jurassic). This marine shale succession was deposited during a long-term transgression, and is part of a complete, relatively well-expanded stratigraphic succession. A rich fauna of ammonites above and below the Oxfordian/Kimmeridgian boundary allows recognition of the Evoluta Subzone (Pseudocordata Zone) and Rosenkrantzi Subzone (Rosenkrantzi Zone) of the Subboreal and Boreal uppermost Oxfordian, and the Densicostata Subzone (Baylei Zone) and the Bauhini Zone of the Subboreal and Boreal lowermost Kimmeridgian). A suitable level for the boundary is thus marked by the replacement of the Subboreal Ringsteadia (M)/Microbiplices (m) by Pictonia (M)/Prorasenia (m), and by the first appearance of Boreal Amoeboceras (Plasmatites). Detailed study of the microfossils reveals an excellent dinoflagellate succession. A variety of stratigraphically important dinoflagellates are found, the assemblages being intermediate in character between Boreal and Subboreal ones. The magnetostratigraphic data, though rather troublesome to extract, shows a polarity pattern which can be confidently correlated to other UK boundary sections. The upper boundary of a normal magnetozone falls at, or very near, the proposed Oxfordian/Kimmeridgian boundary. The 87Sr/86Sr ratio at the boundary, based on an analysis of belemnites, lies between 0,70689 and 0,70697, averaging 0.70693. Matching worldwide trends, no distinct change in the ratio is seen across the boundary. A lack of variations in the carbon isotope composition of belemnites across the Oxfordian/Kimmeridgian boundary does not indicate perturbation in the global carbon cycle. However, high ?13C values and their scatter suggest the influence of local fractionation affecting isotope composition of dissolved inorganic carbon (DIC) in the partly isolated Boreal sea. A fall in the belemnite ?18O values in the Upper Oxfordian and Lower Kimmeridgian compared to the Mid Oxfordian suggests a slight rise in seawater temperature.

Słowa kluczowe

EN

ammonite succession; Oxfordian/Kimmeridgian boundary; microfossils; isotope stratigraphy; magnetostratigraphy

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Volumina Jurassica
• Rocznik: 2006
• Tom: Vol. 4, no. 1
• Strony: 17--33
• Opis fizyczny: Bibliogr. 39 poz.

Twórcy

autor

Wierzbowski A.

autor

Coe A.

autor

Hounslow M.

autor

Matyja B.

autor

Ogg J.

autor

Page K.

autor

Wierzbowski H.

autor

Wright J.

• Państwowy Instytut Geologiczny, ul. Rakowiecka 4, 00-975 Warszawa,

Bibliografia

• Anderson F. W. and Dunham K. C. 1966. The Geology of Northern Skye. Memoir of the Geological Survey of Great Britain (Scotland), 1-216. 
• Bayle E. 1878. Explication de la Carte Géologique de France, 4 . (atlas only published)
• Besse J. and Courtillot V. 1991. Revised and synthetic polar wander paths of the African, Eurasian, North American and Indian Plates, and true polar wander since 200Ma. Journal of Geophysical Research, 9 6: 4029-4050. 
• Birkelund T. and Callomon J. H. 1985. The Kimmeridgian ammonite faunas of Milne Land, Central East Greenland. Gronlands Geologiske Undersolgelse, 153: 1-56. 
• Callomon J. H. 2004. Some comments on the proposals for the GSSP of the Kimmeridgian stage. Newsletter of the International Subcommission on Jurassic Stratigraphy, 3 1: 21-24. 
• Enkin R. J. 2003. The direction-correction tilt test: an all purpose tilt/fold test for palaeomagnetic studies. Earth and Planetary Science Letters, 212: 151-166. 
• Forbes E. 1851. On the Estuary beds and the Oxford Clay at Loch Staffin, in Skye. Quarterly Journal of the Geological Society of London, 7: 104-113. 
• Friedman I. and O’Neil J. R. 1977. Compilation of stable isotope fractionation factors of geochemical Interest. KK1-KK12. In: Data of Geochemistry, 6th edition. Geochemical Survey Professional Paper. 
• Hesketh R. A. P. and Underhill J. R. 2002. The biostratigraphic calibration of the Scottish and Outer Moray Firth Upper Jurassic successions: a new basis for the correlation of Late Oxfordian-Early Kimmeridgian Humber Group reservoirs in the North Sea Basin. Marine and Petroleum Geology, 1 9: 541-562. 
• Hudson J. D. and Morton N. 1969. Guide for Western Scotland. Excursion No 4. International Field Symposium on the British Jurassic. University of Keele, D1-D47. 
• Jenkyns H. C., Jones C. E., Gröcke D. R., Hesselbo S. P. and Parkinson N. 2002. Chemostratigraphy of the Jurassic System: applications, limitations and implications for palaeooceanography. Journal of the Geological Society, London, 159: 351-378. 
• MacGregor M. 1934. The sedimentary rocks of North Trotternish, Isle of Skye. Proceedings of the Geologists’ Association, 4 5: 389-406. 
• Matyja B. A., Page K. N., Wierzbowski A. and Wright J. K. 2004. Subboreal/Boreal ammonite succession at the Oxfordian/Kimmeridgian boundary in the Flodigarry section (Staffin Bay, Isle of Skye, UK). Rivista Italiana di Paleontologia e Stratigrafia, 110: 273-278.
• Matyja B. A. and Wierzbowski A. 1997. The quest for a unified Oxfordian/Kimmeridgian boundary: implications of the ammonite succession at the turn of the Bimammatum and Planula zones in the Wielun Upland, Central Poland. Acta Geologica Polonica, 46, 1-2: 77-105. 
• Matyja B. A. and Wierzbowski A. 2003. Correlation chart of standard chronostratigraphic ammonite zonations at the Oxfordian-Kimmeridgian boundary. Newsletter of the International Subcommission on Jurassic Stratigraphy, 3 0: 25-27. 
• Matyja B. A., Wierzbowski A. and Wright J. K. 2006. The Sub-Boreal/Boreal ammonite succession at the Oxfordian/Kimmeridgian boundary at Flodigarry, Staffin Bay (Isle of Skye), Scotland. Transactions of the Royal Society of Edinburgh, Earth Sciences, 96, 4: 309-318. 
• McFadden P. L. 1998. The fold test as an analytical tool. Geophysical Journal International, 135: 329-338. 
• McFadden P. L. and McElhinney M. W. 1988. The combined analysis of remagnetisation circles and direct observations in palaeomagnetism. Earth and Planetary Science Letters, 8 7: 161-172. 
• McFadden P. L. and McElhinny M. W, 1990. Classification of the reversal test in palaeomagnetism. Geophysical Journal International, 103: 725-729. 
• Mesezhnikov M. S. 1968. Zonalnoye podrasdelenye nizhneho kimeridzha Arktiki. Doklady Akademi Nauk SSSR, 178: 912-915. (in Russian)
• Morton N and Hudson J. D. 1995. Field guide to the Jurassic of the isles of Raasay and Skye, Inner Hebrides, N. W. Scotland. 209-280. In: Taylor P. D. (Ed.), Field geology of the British Jurassic. Geological Society, London. 
• Ogg J. G. and Coe A. L. 1997. Oxfordian magnetic polarity time scale. EOS Transactions, American Geophysical Union, 7 8 (1997 Fall Meeting Supplement): F186. 
• Remane J., Bassett M. G., Cowie J. W., Gohrbrandt K. H., Lane H. R., Michelsen O. and Wang Naiwen 1996. Revised guidelines for the establishment of global chronostratigraphic standards by the International Commission on Stratigraphy (ICS). Episodes, 1 9: 77-81. 
• Riding J. B. and Thomas J. E. 1997. Marine palynomorphs from the Staffin Bay and Staffin Shale formations (Middle-Upper Jurassic) of the Trotternish Peninsula, N. W. Skye. Scottish Journal of Geology, 33: 59-74. 
• Salfeld H. 1913. Certain Upper Jurassic strata of England. Quarterly Journal of the Geological Society of London, 69: 423-432. 
• Schweigert G. and Callomon J. H. 1997. Der bauhini-Faunenhorizont und seine Bedeutung für die Korrelation zwischen tethyalem und subborealem Oberjura. Stuttgarter Beiträge zur Naturkunde, Serie B (Geologie und Palaontologie), 247: 1-69. 
• Stancliffe R. P. W. 1990. Acritarchs and other nondinophycean marine palynomorphs from the Oxfordian (Upper Jurassic) of Skye, western Scotland and Dorset, southern England. Palynology, 1 4: 175-192. 
• Sykes R. M. 1975. The stratigraphy of the Callovian and Oxfordian stages (Middle-Upper Jurassic) in northern Scotland. Scottish Journal of Geology, 1 1: 51-78. 
• Sykes R. M. and Callomon J. H. 1979. The Amoeboceras zonation of the Boreal Upper Oxfordian. Palaeontology, 2 2: 839-903. 
• Tornquist A. 1896. Die degenerierten Perisphinctiden des Kimmeridge von Le Havre. Mémoire Societe paléontologique Suisse, 2 3: 1-44. 
• Torsvik T. T., Van der Voo R., Meert J. G. and Waldehaug H. J. 2001. Reconstructions of the continents around the north Atlantic at about the 60th parallel. Earth and Planetary Science Letters, 187: 55-69. 
• Turner J. A. 1966. The Oxford Clay of Skye, Scalpay and Eigg. Scottish Journal of Geology, 2: 243-252. 
• Wierzbowski A. and Smelror M. 1993. Ammonite succession in the Kimmeridgian of southwestern Barents Sea, and the Amoeboceras zonation of the Boreal Kimmeridgian. Acta Geologica Polonica, 4 3: 229-250. 
• Wierzbowski H. 2002. Detailed oxygen and carbon isotope stratigraphy of the Oxfordian in Central Poland. International Journal of Earth Sciences, 9 1: 304-314. 
• Wierzbowski H. 2004. Carbon and oxygen isotope composition of Oxfordian-Early Kimmeridgian belemnite rostra: palaeoenvironmental implications for Late Jurassic seas. Palaeogeography, Palaeoclimatology, Palaeoecology, 203: 153-168. 
• Wright J. K. 1973. The Middle and Upper Oxfordian and Kimmeridgian Staffin Shales at Staffin, Isle of Skye. Proceedings of the Geologists’ Association, 8 4: 447-457. 
• Wright J. K. 1989. The early Kimmeridgian ammonite succession at Staffin, Isle of Skye. Scottish Journal of Geology, 2 5: 263-272. 
• Wright J. K. 2001. Staffin. In: Wright J. K. and Cox B. M. (Eds), British Upper Jurassic Stratigraphy (Oxfordian to Kimmeridgian). 201-210, Joint Nature Conservation Committee, Peterborough. 
• Wright J. K. 2003. New exposures of the Ampthill Clay near Swindon, Wiltshire, and their significance within the succession of Oxfordian- Kimmeridgian boundary beds in southern England. Proceedings of the Geologists’ Association, 114: 97-121.