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The siliciclastics/carbonates shift in the Jurassic of the Western Caucasus (central northern Neo-Tethys): reconsidering research over the last 50 years

Abstract

A chain of carbonate platforms evolved in the northern Neo-Tethys during the Late Jurassic, but current knowledge remains incomplete as long as data from several larger regions, such as the Western Caucasus, are not included. In order to fill this gap, it is here suggested to reconsider the information accumulated chiefly during Soviet times. Although these data are too general, they still matter with regard to some regional characteristics and tentative interpretations. Available data on the spatio-temporal distribution of Bajocian-Callovian sedimentary rocks are summarised in a novel way which permits documentation of depositional trends at six representative localities in the Western Caucasus. The extent of the carbonate platform increased at two localities since the Late Callovian and at a third since the Middle Oxfordian. Three additional sites were characterised either by non-deposition or deep-marine sedimentation. The onset of carbonate platform development marked a remarkable shift from chiefly siliciclastic to carbonate deposition, although this event was not sudden everywhere. The Bathonian pulse of tectonic activity, coupled with the eustatic sea level rise, allowed shelves to expand during the Callovian-Oxfordian, with a reduction in siliciclastic input from islands and sea-water that became well oxygenated and warmer. These conditions were conducive to biogenic carbonate production, allowing the carbonate platform to expand subsequently.

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Secular and catastrophic processes reflected in sediments of the Suchedniów water reservoir, Holy Cross Mountains (Poland)

. Hydromorfologiczne uwarunkowania funkcjonowania geoekosystemu Zbiornika Włocławskiego [Hydromorphological conditions of the functioning of the Włocławek Reservoir geo-ecosystem]. Instytut Geografii i Przestrzennego Zagospodarowania PAN, Warszawa, 224 pp. Gilbert, G.K., 1885. The topographic features of lake shores . US Government Printing Office. Gobo, K., 2014. Development of Gilbert-type deltas: sedimentological case studies from the Plio-Pleistocene of Corinth Rift, Greece . Faculty of Mathematics and Natural Sciences University of Bergen, 16 pp. Górski, J

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A new type of slumping-induced soft-sediment deformation structure: the envelope structure

References Abbate, E., Bortolotti, V. & Passerini, P., 1970. Olistostromes and olistoliths. Sedimentary Geology 4, 521–557. Aber, J.S. & Ber, A. 2007. Glaciotectonism . Developments in Quaternary Science, vol. 6. Elsevier, Amsterdam, 246 pp. Alfaro, P., Moretti, M. & Soria, J.M., 1997. Soft-sediment deformation structures induced by earthquakes (seismites) in Pliocene lacustrine deposits (Guadix-Baza Basin, central Betic Cordillera). Eclogae Geologicae Helvetiae 90, 531–540. Allen, J.R.L., 1982. Sedimentary structures: their

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Miocene quartz sands redeposited on subaqueous and alluvial fans during the Saalian: Interpretation of the depositional scenario at Ujście, western Poland

. & Alhonen, P., 1996. The development of a late Weichselian – early Holocene subaqueous ice-contact fan, Teikangas, SW Finland. Bulletin of the Geological Society of Finland 68, 34–49. Lüthgens, C., Böse, M. & Preussner, F., 2011. Age of the Pomeranian ice marginal position in northeastern Germany determined by Optically Stimulated Luminescence (OSL) dating of glaciofluvial sediments. Boreas 40, 598–615. Marcinkowski, B. & Mycielska-Dowgiałło, E., 2013. Heavy-mineral analysis in Polish investigations of Quaternary deposits: a review. Geologos 19, 5

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Sandstone petrography and geochemistry of the Nayband Formation (Upper Triassic, Central Iran): Implications for sediment provenance and tectonic setting

pp. http://dx.doi.org/10.1017/S001675680003216 Tortosa, A., Palomares, M. and Arribas, J., 1991. Quartz grain types in Holocene deposits from the Spanish Central System: some problems in provenance analysis. In : A.C. Morton, S.P. Todd, and P.D.W. Huaghton (eds.), Development in Sedimentary Provenance Studies. Geological Society, London, Special Publications. Geological Society, London, 57, pp. 47–54. https://doi.org/10.1144/GSL.SP.1991.057.01.05 Weltje, G. J., Meij, X. D. and De Boer, P. L., 1998. Straiti-graphic inversion of siliciclastic basin

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Structural evidence of in-sequence and out-of-sequence thrusting in the Karwendel mountains and the tectonic subdivision of the western Northern Calcareous Alps

Northern Calcareous Alps during Triassic times. In: Flügel, H.W., Faupl, P. (Eds.), Geodynamics of the Eastern Alps. Deuticke, Wien, 85–102. Leitner, C., Spötl, C., 2017. Chapter 21 - The Eastern Alps: Multistage Development of Extremely Deformed Evaporites. In: Soto, J.I., Flinch, J.F., Tari, G. (Eds.), Permo-Triassic Salt Provinces of Europe, North Africa and the Atlantic Margins. Elsevier, 467–482. Loesch, K.C.v., 1915. Der Schollenbau im Wetterstein- und Mieminger- Gebirge. Jahrbuch der k. k. Geologischen Reichsanstalt, 64 (1914), 1–98. Mandl, G

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New interpretation of the provenance of crystalline material from Oligocene flysch deposits of the Skole Nappe, Poland: evidence from heavy minerals and clasts in the Nowy Borek section

-Świder-ska (Eds): Katalog obiektów geoturystycznych w Polsce . Wydawnictwo Akademii Górniczo-Hutniczej, Kraków, 158–159. Malata, T. & Poprawa, P., 2006. Evolution of the Skole Subbasin. [In:] N. Oszczypko, A. Uchman & E. Malata (Eds): Rozwój Paleotektoniczny Basenów Karpat Zewnętrznych i Pienińskiego Pasa Skałkowego . Instytut Nauk Geologicznych Uniwersytetu Jagiellońskiego, Kraków, 103–110. Mange, M.A. & Morton, A.C., 2007. Geochemistry of heavy minerals. [In:] M.A. Mange & D.T. Wright (Eds): Heavy Minerals in Use . Developments in Sedimentology 58, 345

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Geoarchaeological evaluation of the Roman topography and accessibility by sea of ancient Osor (Cres Island, Croatia)

Heritage. Midsea Books, Santa Venera, 359 pp. Bronk Ramsey, C., 2009. Bayesian analysis of radiocarbon dates. Radiocarbon, 51/1, 337–360. https://doi.org/10.1017/S0033822200033865 Brunović, D., Miko, S., Hasan, O., Ilijanić, N., Papatheodorou, G., Christodoulou, D., Geraga, M., Dumbir, A.M., Razum, I., Hajek, Tadesse, V., Bakrač, K. and Šparica Miko, M., 2017. The Late Quaternary palaeoenvironmental development of Lošinj Channel, Adriatic Sea. 5 th Regional Scientific Meeting on Quaternary Geology dedicated to Geohazards, 9–10 November 2017, Starigrad

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Unusual development of sandur sedimentary succession, an example from the Pleistocene of S Poland

the Brahmaputra River, Bangladesh. [In] Best, J. L. & Bristow, C. S. (Eds), Braided rivers. Geological Society, Special Publication 75, 277-289. Church, M., 1972. Baffin Island sandurs: a study of Arctic fluvial processes. Bulletin of the Geological Survey of Canada 216, 1-208. Dawson, M. R. & Bryant, I. D., 1987. Three-dimensional facies geometry in Pleistocene outwash sediments, Worcestershire, U. K. [In:] Ethridge, F. G. (Ed.), Recent developments in fluvial sedimentology. Society of Economic

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Long-term shoreline shifts on continental blocks during the Bajocian: an updated interpretation based on synthetic stratigraphical and palaeogeographical developments on regional scales

Abstract

Available reconstructions of Jurassic global sea level changes differ and are in need of an update. New stratigraphical charts and palaeogeographical developments for a number of large continental blocks or their portions of these (e.g., Germany, India, northeast Africa, northwest Australia, the Russian Platform and western Siberia) reveal regional long-term shoreline shifts (i.e., transgressions and regressions) during the Bajocian Stage (168.3–170.3 Ma). A comparison of these allows to document only a single coherent feature, namely the earliest Bajocian transgression, in the majority of the continental blocks considered. Undoubtedly, this event was triggered by a eustatic rise. However, long-term shoreline shifts were either weak to absent or differed between the blocks during almost the entire Bajocian, thus providing evidence of the apparent stability of global sea level and the importance of regional tectonic activity as a control mechanism on particular transgressions and regressions. Interestingly, it appears that the earliest Bajocian eustatic rise was a constituent of a long-term eustatic pattern; the nature of this event has yet to be fully understood. Generally, the findings presented here are in better agreement with Anthony Hallam’s view of Jurassic eustasy and question some other global sea level reconstructions.

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