Summary
Fischer's classic study (1964) of the Upper Triassic “Lofer” cyclothems in the Dachstein Limestone of the Northern Calcareous Alps was seminal to many studies of the Dachstein and to carbonate cycles globally.Fischer's idealized cycle is deepening upward, ABC in his terminology, where member A is a surface or interval of subaerial exposure, B is tidal deposits, and C is shallow subtidal. Studies of the Dachstein from the elsewhere in the northern Alps have substantiatedFischer's upward-deepening ABC cycle, butGoldhammer et al. (1990) andSatterley (1996a) reinterpreted the type Lofer cycles as shoaling upward.
We measured 139 m of Dachstein Limestone incorporating 25 cycles at Steinernes Meer, Austria, nearFischer's most extensive section. In this section we identified no A members. The section is punctuated by slightly reddish horizons (‘pink partings’) that in some cases may reflect brief subaerial exposure, but generally appear to be pressure-solution zones that have concentrated iron oxides but lack a distinctive isotopic signature. B members are readily distinguished by fenestral porosity, stromatolitic lamination, partial dolomitization, intraclasts, or desciccation cracks. They are relatively thin (5 to 155 cm; median thickness is 38 cm.) and in some cases laterally variable or discontinuous. C members are characterized by molluscan wackestones and packstones with diverse biota. C intervals are 25 cm to 26 m thick (median 4.1 m) and comprise 91% of the interval measured. Pervasive bright-red internal sediment, which appears commonly within the B and C members, does not derive from any interval observed within the measured section, but from sources, possibly paleosols, much higher in the section. It is spatially associated with near-vertical, ENE-trending (62o) fractures filled with the sediment, brachiopods, and cement. Such fractures cut stratigraphic intervals as thick as 70 m without an exposed top or base.
If “pink partings” were accepted as indicative of subaerial exposure, three cyclothems (12%) would correspond toFischer's ideal upward-deepening cyclothem, seven cyclothems (29%) are shoaling-upward, four (17%) are symmetrical and the remaining 10 (42%) are incomplete with both deepening and shoaling components. If subaerial disconformities are absent, the intervals are better described as BCBC rhythms than as true cycles. Our study is intended to stimulate new discussion of patterns and origin of the Lofer cycles.
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References
Allan, J. R. &Matthews, R. K. (1982): Isotope signatures associated with early meteoric diagenesis.—Sedimentology,29, 797–817, Amsterdam
Balog, A., Haas, J., Read, J.F. &Coruh, C. (1997): Shallow marine record of orbitally forced cyclicity in a late Triassic carbonate platform, Hungary.—Journal of Sedimentary Research,67, 661–675, Tulsa
Böhm, F. &Joachimski, M. (1993): Stabile Isotopen und Mikrofazies der Lofer-Zyklen: Chaotische Zyklotheme in der Obertrias (Nördliche Kalkalpen)(abstract).—SEDIMENT '93, 8, Sedimentologentreffen Juni 3.–5, 1993 in Marburg, Kurzfassungen von Vorträgen und Postern.—Geologica et Palaeontologica,27, 228–229 Marburg
Borza, K. (1977): Cyklická sedimentácia dachsteinskych vápencov Muránskej planiny.—Geologické Pracé,67, 23–52, Bratislava.
Bosellini, A. (1967): La tematica depositionale della Dolomia Principale (Dolomiti e Prealpi Venete).—Bolletino della Società Geologica Italiana,86, 133–169, Roma
Bosellini, A. &Hardie, L.A. (1985): Facies e cicli della Dolomia Principaledelle Alpi Venete.—Memorie della Società Geologica Italiana,30, 245–266, Pavia
Dunham, R. J. (1962): Classification of carbonate rocks according to their depositional texture.—In:Ham, W. E. (ed.): Classification of carbonate rocks.—American Association of Petroleum Geologists Memoir1, 108–121, Tulsa
Enos, P. (1983): Shelf environment.—In:Scholle, P. A., Bebout, D. G. & Moore, C. H. (eds.): Carbonate depositional environments.—American Association of Petroleum Geologists Memoir33, 267–295, Tulsa
Enos, P. & Samankassou, E. (1996): Lofer cycles revisited (abstract).—SEDIMENT '96.30; 11. Sedimentologentreffen, May 9.–15., 1996 in Vienna
Esteban, M. & Klappa, C. F. (1983): Subaerial exposure environment.—In:Scholle, P. A., Bebout, D. G. & Moori, C. H. (eds.): Carbonate Depositional Environments.—American Association of Petroleum Geologists Memoir33, 1–54, Tulsa
Fischer, A. G. (1964): The Lofer cyclothems of the Alpine Triassic.—In:Merriam, D. F. (ed.), Symposium on Cyclic Sedimentation.—Kansas Geological Survey Bulletin169, 107–149, Lawrence
— (1975): Tidal deposits, Dachstein Limestone of the North-Alpine Triassic..—In:Ginsburg, R. N. (ed.): Tidal deposits, a casebook of recent examples and fossil counterparts.—235–242, New York (Springer)
Flugel, E. (1981): Paleoecology and facies of Upper Triassic reefs in the Northern Calcareous Alps.—In:Toomey, D. F. (ed.): European fossil reef models.—SEPM Special Publication No.30, 291–359, Tulsa
Goldhammer, R. K., Dunn, P. A. &Hardie, L. A. (1990): Depositional cycles, composite sea-level changes, cycle stacking patterns, and the hierarchy of stratigraphic forcing: examples from Alpine Triassic platform carbonates.—Geological Society of America Bulletin,102, 535–562. Boulder
Goldstein, R. H. (1988): Paleosols of Late Pennsylvanian cyclic strata, New Mexico.—Sedimentology,35, 777–804, Oxford
Haas, J. (1982): Facies analysis of the cyclic Dachstein Limestone Formation (Upper Triassic) in the Bakony Mountains. Hungary.—Facies,6, 75–84, Erlangen
— (1991): A basic model for Lofer cycles.—In:Einsele, G., Ricken, W., &Seilacher, A. (eds.): Cycles and events in stratigraphy.—722–732, New York (Springer)
— (1994): Lofer cycles of the Upper Triassic Dachstein platform in the Transdanubian Mid-Mountains, Hungary.—Special Publication of the Int.—Assoc. Sedíment.,19, 303–322, Oxford
Haas, J. &Balog, A. (1995): Facies characteristics of the Lofer cycles in the Upper Triassic Dachstein platform in the Transdanubian Range, Hungary.—Acta Geological Hungarica,38(1), 1–36, Budapest
Haas, J. &Dobosi, K. (1982): Investigation of Upper Triassic cyclic carbonate rocks in key sections in the Bakony.—Inst. Geol. Publ. Hung.,1980, 135–168, Budapest
James, N. P. (1984): Shallowing-upward sequences in carbonates.—In:Walker, R. G. (ed.): Facies Models (2nd. Edition). —Geoscience Canada Reprint Series1, 213–228, St. John's
James, N. P. &Choquette, P. W. (eds.) (1988): Paleokarst.— 416 pp., New York (Springer)
Moore, R. C. (1931): Pennsylvanian cycles in the northern Mid-continent region.—Illinois Geological Survey Bulletin,60/5, 247–257 Champaign
Ogorelec, B. &Rothe, P. (1992): Mikofazies. Diagenese und Geochemie des Dachsteinkalkes und Hauptdolomits in Süd-West-Slowenien.—Geologija,35, 81–181 Ljubljana
Piller, W. E. (1981): The Steinplatte reef complex, part of an Upper Triassic carbonate platform near Salzburg. Austria.—In:Toomey, D. F. (ed.): European fossil reef models.—SEPM Special Publication No.30, 261–290, Tulsa
Sander, B. (1936): Beiträge zur Kenntnis der Ablagerungsgefüge (rhythmische Kalke und Dolomite aus der Trias).—Tschermaks Mineralogische und Petrographische Mitteilungen,48, 27–139, Leipzig
— (1951): Einführung in die Gefugekunde als geologischer Körper. 2. Teil. Die Korngefügemerkmale.—409 pp. Wien (Springer)
Satterley, A. K. (1996a): Cyclic carbonate sedimentation in the upper Triassic Dachstein limestone, Austria: The role of patterns of sediment supply and tectonics in a platform-reefbasin system.—Journal of Sedimentary Research,66(2), 307–323, Tulsa
— (1996b): The interpretation of cyclic successions of the Middle and Upper Triassic of the Northern and Southern Alps.—Earth.-Science Reviews,40(3–4), 181–207, Amsterdam.
Satterley, A. K. &Brandner, R. (1995): The genesis of Lofer cycles of the Dachstein Limestone, Northern Calcareous Alps, Austria.—Geologische Rundschau,84, 287–292, Berlin
Scholl, W. U. &Wendt, J. (1971): Obertriadische und jurassische Spaltenfüllungen im Steineren Meer (Nördliche Kalkalpen).—Neues Jahrbuch für Geologie und Paläontologie. Abhandlungen,139, 82–98. Stuttgart
Schwarzacher, W. (1948): Über sedimentäre Rhythmik des Dachsteinkalkes am Lofer.—Verhandlungen der Geologischen Bundesanstalt.1947, (Heft 10–12), 176–188, Wien
— (1954): Die Grossrhythmik des Dachstein Kalkes von Lofer.—Tschermaks Mineralogische und Petrographische Mitteilungen,4, 44–54, Leipzig
Schwarzacher, W. &Haas, J. (1986): Comparative statistical analysis of some Hungarian and Austrian Upper Triassic peritidal carbonate sequences.—Acta Geologica Hungarica,29, 175–196, Budapest
Szulczewski, M., Bei Ka Z. &Skompski, S. (1996): The drowning of a carbonate platform: An example from the Devonian-Carboniferous of the southwestern Holy Cross Mountains, Poland.—Sedimentary Geology,106(1–2), 21–49, Amsterdam.
Weller, J. M. (1930): Cyclic sedimentation of the Pennsylvanian Period and its significance.—Journal of Geology,38, 97–135, Chicago
Zankl, H. (1967): Die Karbonatsedimente der Obertrias in den Nördlichen Kalkalpen.—Geologische Rundschau.,56, 128–139, Stuttgart
Zapfe, H. (1957): Dachsteinkalk und “Dachsteinmuschel”.—Natur u. Volk.87/3, 87–94, Frankfurt
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Enos, P., Samankassou, E. Lofer cyclothems revisited (Late triassic, Northern Alps, Austria). Facies 38, 207–227 (1998). https://doi.org/10.1007/BF02537366
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DOI: https://doi.org/10.1007/BF02537366