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Earth Science Institute of the Slovak Academy of Sciences

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Polish Geological Institute Institute of Geology - Academy of Sciences of the Czech Republic

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ORIGIN OF RHYTHMICALLY BEDDED CENOMANIAN CARBONATE ROCKS OF THE BAKHCHISARAI REGION (SW CRIMEA)

• Geologica Carpathica
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• Volume 50 No.1 / February 1999

Published: Feb 1999

Pages: 49 - 61

Authors: RUSLAN GABDULLIN, ANDREY GUZHIKOV, IVAN DUNDIN

Abstract: Rhythmically bedded marls and limestones were studied in the Cenomanian deposits of SW part of Mountain Crimea in Ukraine. Carbonate content, TOC, XRD, foraminiferal, petromagnetic analyses and ichnofossil distribution analysis were carried out on 115 samples from 6 sections to define the nature of 5 types of rhythmicity. Marl-sandy marl rhythms of the Lower Cenomanian transform into limestone-marl rhythms of the Middle Cenomanian. Upper Cenomanian rocks contain limestone-limestone, limestone-marl rhythms and rhythmically bedded black shales (analog of „Bonarelli level“). The types of the rhythms can be classified due to lithology and their paleogeographic position. Cycles of dilution, solution and bioproduction are involved, 11 paleogeographic models are discussed, 6 are proposed. The nature of the rhythms can be connected with Milankovich cycles.

Keywords: Crimea, Cenomanian, rhythmicity, carbonate rocks, paleogeographic models

Volume 50 no. 1 / February 1999

• EVGENIJ J. BARABOSHKIN

  BERRIASIAN-VALANGINIAN (EARLY CRETACEOUS) SEAWAYS OF THE RUSSIAN PLATFORM BASIN AND THE PROBLEM OF BOREAL/TETHYAN CORRELATION

• MARTA BAK

  CRETACEOUS RADIOLARIAN ZONATION IN THE POLISH PART OF THE PIENINY KLIPPEN BELT (WESTERN CARPATHIANS)

• MIROSLAV BUBIK, MARTA BAK, LILIAN SVABENICKA

  BIOSTRATIGRAPHY OF THE MAASTRICHTIAN TO PALEOCENE DISTAL FLYSCH SEDIMENTS OF THE RACA UNIT IN THE UZGRUN SECTION (MAGURA GROUP OF NAPPES, CZECH REPUBLIC)

• RUSLAN GABDULLIN, ANDREY GUZHIKOV, IVAN DUNDIN

  ORIGIN OF RHYTHMICALLY BEDDED CENOMANIAN CARBONATE ROCKS OF THE BAKHCHISARAI REGION (SW CRIMEA)

• M. ADAM GASINSKI, MALGORZATA JUGOWIEC, ANDRZEJ SLACZKA

  LATE CRETACEOUS FORAMINIFERIDS AND CALCAREOUS NANNOPLANKTON FROM THE WEGLÓWKA MARLS (SUBSILESIAN UNIT, OUTER CARPATHIANS, POLAND)

• ELZBIETA GEDL

  LOWER CRETACEOUS PALYNOMORPHS FROM THE SKOLE NAPPE (OUTER CARPATHIANS, POLAND)

• SUSANNE HENNIG, HELMUT WEISSERT, LUC BULOT

  C-ISOTOPE STRATIGRAPHY, A CALIBRATION TOOL BETWEEN AMMONITE - AND MAGNETOSTRATIGRAPHY: THE VALANGINIAN-HAUTERIVIAN TRANSITION