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Nagy, Jen??; Reolid, Mat??as; Rodr??guez-Tovar, Francisco J. (2009)
Publisher: Co-Action Publishing
Journal: Polar Research
Languages: English
Types: Article
Subjects: Palaeoenvironments, Foraminifera, Morphogroups, Microhabitats, Jurassic, Spitsbergen
Analysis of benthic foraminiferal assemblages was performed in Bathonian to Kimmeridgian deposits through a section covering the lower half of the Agardhfjellet Formation in central Spitsbergen. The section consists mainly of organic-rich shales, which contain low-diversity agglutinated assemblages. In this foraminiferal succession five morphogroups were differentiated according to shell architecture (general shape, mode of coiling and number of chambers), integrated with the supposed microhabitat (epifaunal, shallow infaunal and deep infaunal) and feeding strategy (suspension-feeder, herbivore, bacterivore, etc.). The environmental evolution of the analysed section is interpreted by using the stratigraphic distribution of morphogroups, combined with species diversities and sedimentary data, in a sequence stratigraphic framework. The section comprises two depositional sequences, which demonstrate that species diversity and relative frequency of morphogroups are correlative with transgressive???regressive trends controlling depth and oxygenation of the water column. In both sequences, the maximum flooding interval is characterized by increased organic carbon content, dominance of the epifaunal morphogroups and reduced species diversity: features reflecting the increased degree of stagnation separating the transgressive phase from the regressive phase.
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    • Århus N. 1998. Palynostratigraphy of some BathonianHauterivian sections in the Arctic, with emphasis on the Janusfjellet Formation type section, Spitsbergen. Institutt for Kontinentalsokkelundersøkelser og Petroleumsteknologi AS (IKU Sintef-gruppen) Report 23.1252.11/01/88. Trondheim: SINTEF Petroleum Research.
    • Ba˛ k K. 2004. Deep-water agglutinated foraminiferal changes across the Cretaceous/Tertiary and Palaeocene/Eocene transitions in the deep flysch environment; eastern Outer Carpathians (Bieszczady Mts, Poland). In M. Bubik & M.A. Kaminski (eds.): Proceedings of the Sixth International Workshop on Agglutinated Foraminifera. Grzybowski Foundation Special Publication 8. Pp. 1-56. Krakow: Grzybowski Foundation.
    • Chamney T.P. 1976. Foraminiferal morphogroup symbol for paleoenvironmental interpretation of drill cutting samples: Arctic America, Albian continental margin. Maritime Sediments, Special Publication 18, 585-624.
    • Dypvik H., Nagy J., Eikeland T.A., Backer-Owe K. & Johansen H. 1991. Depositional conditions of the Bathonian to Hauterivian Janusfjellet Subgroup, Spitsbergen. Sedimentary Geology 72, 55-78.
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    • Nagy J. 1992. Environmental significance of foraminiferal morphogroups in Jurassic North Sea deltas. Palaeogeography, Palaeoecology, Palaeoclimatology 95, 111-134.
    • Nagy J. & Basov V.A. 1998. Revised foraminiferal taxa and biostratigraphy of Bathonian to Ryazanian deposits in Spitsbergen. Micropaleontology 44, 217-255.
    • Nagy J., Grandstein F.M., Kaminski M.A. & Holbourn A.E. 1995. Foraminiferal morphogroups, paleoenvironments and new taxa from Jurassic to Cretaceous strata of Thakkhola, Nepal. In M.A. Kaminski et al. (eds.): Proceedings of the Fourth International Workshop on Agglutinated Foraminifera. Grzybowski Foundation Special Publication 3. Pp. 181-209. Krakow: Grzybowski Foundation.
    • Nagy J., Løfaldi M. & Bäckström S.A. 1988. Aspects of foraminiferal distribution and depositional conditions in Middle Jurassic to Early Cretaceous shales in eastern Spitsbergen. Abhandlungen der Geologischen Bundesanstalt 30, 297-300.
    • Reolid M., Rodríguez-Tovar F.J., Nagy J. & Olóriz F. 2008. Benthic foraminiferal morphogroups of mid to outer shelf environments of the Late Jurassic (Prebetic Zone, southern Spain): characterization of biofacies and environmental significance. Palaeogeography, Palaeoecology, Palaeoclimatology 261, 280-299.
    • Severin K.P. 1983. Test morphology of benthic foraminifera as a discriminator of biofacies. Marine Micropaleontology 8, 65-76.
    • Szydlo A. 2004. The distribution of agglutinated foraminifera in the Cieszyn Basin, Polish Outer Carpathians. In M. Bubik & M.A. Kaminski (eds.): Proceedings of the Sixth International Workshop on Agglutinated Foraminifera. Grzybowski Foundation Special Publication 8. Pp. 461-470. Krakow: Grzybowski Foundation.
    • Tyszka J. 1994. Response of Middle Jurassic benthic foraminiferal morphogroups to dysoxic/anoxic conditions in the Pieniny Klippen Basin, Polish Carpathians. Palaeogeography, Palaeoecology, Palaeoclimatology 110, 55-81.
    • Subgroup D1
    • Ammoglobigerina canningensis (Tappan, 1955); Trochammina kosyrevae Levina, 1972; Trochammina aff. minutissima Dain, 1972; Trochammina misinovi Levina, 1972; Trochammina praerosacea Nagy & Basov, 1998; Trochammina rostovzevi Levina, 1972; Trochammina sp.; Trochammina spp.
    • Subgroup D2
    • Cribrostomoides subretusus Nagy & Basov, 1998; Cribrostomoides sp.; Haplophragmoides canuiformis Dain, 1972; Haplophragmoides sp.; Recurvoides disputabilis Dain, 1972; Recurvoides aff. disputabilis Dain, 1972; Recurvoides scherkalyensis Levina, 1962; Recurvoides aff. scherkalyensis Levina, 1962; Recurvoides sp.
    • Ammodiscus aff. pseudoinfimus Gerke & Sossipatrova, 1961; Ammodiscus sp.; Arenoturrispirillina jeletzkyi Chamney, 1971; Glomospira oxfordiana Sharovskaja, 1966; Glomospira semiaffixa Sharovkaja, 1966.
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