caa a22 4500 469045558 CHVBK 20180323132823.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF02536818 doi (NATIONALLICENCE)springer-10.1007/BF02536818 Vendian-Cambrian tidal and sabkha facies of the Siberian platform [Elektronische Daten] [Vitaly Kuznetsov, Vaclav Suchy] Summary: The Vendian-Cambrian interval on the Siberian Platform contains thick carbonate and evaporite sequences formed in extensive shallow-water basins. The carbonate sequences are characterized by a cyclic composition. Finegrained dolomites, undulated algal dolomites, flat pebble conglomerates, storm breccias and solution-collapse breccias form the base of each cycle. These rocks are characterized by an increased clay content which can be high enough to form argillites. Short sedimentation breaks reflected by mudcracks or silicification horizons are present as well as small cross-bedded tidal channels. Peloidal grainstones with algal overgrowth dominate in the central parts of the cycles. These members are often recrystallized and dolomitized. Micritic dolomites, undulous laminated dolomites, storm breccias and columnar stromatolites with abundant mud cracks form the upper members of the cycles. These sequences are free of clay but contain abundant anhydrite crystals and nodules. In the uppermost parts of some cycles massive layered anhydrite beds are present. The cycles vary in thickness, but usually they are between 15 and 20 m thick. The lower cycle member documents extreme shallow-water deposits. They formed in tidal and partially also supratidal zones not far from the mainland, from where fine clayey material was washed in. These parts of the sequence reflect a slow transgression. The central member of a cycle was deposited during the maximal transgression in a shallow basin with normal salinity and rather active hydrodynamics. Sedimentation of the upper part of the cycles reflects a regression stage (tidal and especially sabkha environments). The final layered anhydrite beds formed most probably in relict lakes on the sabkha plain. During sea-level falls some sequences of the central parts of the cycles were subaerially exposed and underwent partial dolomitization. The Vendian-Cambrian sabkhas are partly comparable with their recent counterparts. Institut für Paläontologie, Universität Erlangen, 1992 Microfacies nationallicence Tidal Deposits nationallicence Sabkha nationallicence Siberian Platform nationallicence Vendian-Cambrian nationallicence Kuznetsov Vitaly Gubkin Academy for Oil and Gas, Leninsky prospekt 65, 117917, Moskva aut Suchy Vaclav Department of Petrology, Charles University, Albertov 6, 12843, Prague aut Facies Springer-Verlag 27/1(1992-12-01), 285-293 0172-9179 27:1<285 1992 27 10347 https://doi.org/10.1007/BF02536818 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02536818 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kuznetsov Vitaly Gubkin Academy for Oil and Gas, Leninsky prospekt 65, 117917, Moskva aut NATIONALLICENCE 700 1- Suchy Vaclav Department of Petrology, Charles University, Albertov 6, 12843, Prague aut NATIONALLICENCE 773 0- Facies Springer-Verlag 27/1(1992-12-01), 285-293 0172-9179 27:1<285 1992 27 10347 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer