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A high-resolution stratigraphic calibration of the upper Lower (upper Mantelliceras dixoni Zone) and lower Middle Cenomanian (Cunningtoniceras inerme Zone and lower Acanthoceras rhotomagense Zone) based on an integrated analysis of macrofossil biostratigraphy, event, cyclo-, stable-isotope and sequence stratigraphy of northern German and southern England key sections is presented. Classic event stratigraphy has a good potential in refining biostratigraphic correlations as most of the classic bioevents are isochronous within the integrated stratigraphy. Many lithological event beds such as marker marls can be incorporated into the cyclo- and sequence stratigraphic framework, explaining their significance in interregional correlation. The best stratigraphic resolution provides the cyclostratigraphy based on the typical Cenomanian marl-limestone couplets and their stacking pattern, inferred to reflect orbital forcing of the Milankovitch frequency band: detailed bed-by-bed correlation of couplets (precession cycle, ca. 20 kyr) allows a stratigraphic calibration within [similar to]10 kyr time slices. Conspicuous marker marl beds embrace bundles of [similar to]five couplets and are related to the short eccentricity (100 kyr) cycle. However, for the upper Lower Cenomanian (dixoni Zone) it appears that the existing couplet scale is incomplete. Sequence stratigraphic analysis demonstrates that the investigated interval comprises the maximum flooding and highstand interval of an Early Cenomanian sequence, capped by a significant late dixoni Zone sequence boundary, followed by uppermost Lower to Middle Cenomanian lowstand and transgressive deposits grading into a Middle Cenomanian maximum flooding zone ("calcimetry break"). Carbon stable-isotope values are stable around 2[per mil] vs. V-PDB within the mid- and late dixoni Zone,related to equilibrium conditions during maximum flooding and highstand conditions of sea-level. The latest Early to earliest Middle Cenomanian sea-level fall and lowstand was accompanied by a negative [delta] [^13]C excursion of ca. 0.4[per mil] in couplets B34-B40 (Lower-Middle Cenomanian boundary isotope Event, LMCE, new name) followed by a rise of 0.4.0.6[per mil] [delta] [^13]C in couplets B41-C2 during the early transgressive systems tract (Middle Cenomanian [delta] [^13]C excursion MCE 1). These observations support the interpretation that the [delta] [^13]C signal is a good proxy for (eustatic) sea-level changes. The LMCE is suggested as a proxy marker for the base of the Middle Cenomanian Substage.
Czasopismo
Rocznik
Tom
Strony
263--279
Opis fizyczny
Bibliogr. 41 poz.,Tabl. 1,Fot., rys.,
Twórcy
autor
- Institut fur Palaontologie der Bayerischen Julius-Maximilians-Universitat, Pleicherwall 1, D-97070 Wurzburg, Germany, m.wilmsen@mail.uni-wuerzburg.de
Bibliografia
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- WILMSEN, M. 2003. Sequence stratigraphy and palaeoceanography of the Cenomanian Stage in northern Germany. Cretaceous Research, 24, 525-568.
- WILMSEN, M. 2007. Accommodation- versus capacity-controlled deposition in the Cenomanian (Upper Cretaceous) of northern Germany. Beringeria, 37, 239-251
- WILMSEN, M. (in press) The Early Cenomanian Schloenbachia/Inoceramus virgatus Event: Integrated analysis of a Cretaceous bioevent (northern Germany and southern England). Palaeogeography, Palaeoclimatology, Palaeoecology.
- WILMSEN, M. & NIEBUHR, B. 2002. Stratigraphic revision of the upper Lower and Middle Cenomanian in the Lower Saxony Basin (northern Germany) with special reference to the Salzgitter area. Cretaceous Research, 23, 445-460.
- WILMSEN, M. & RABE, M. (in press) Belemnites from the lower Middle Cenomanian of Hoppenstedt, northern Germany: significance and integrated correlation. Cretaceous Research.
- WILMSEN, M. & WOOD, C.J. 2004. The Cenomanian of Hoppenstedt, northern Germany: a Subhercynian key section revisited. Newletters on Stratigraphy, 40, 209-230.
- WILMSEN, M., NIEBUHR, B. & HISS, M. 2005. The Cenomanian of northern Germany: facies analysis of a transgressive biosedimentary system. Facies, 51, 242-263.
- WILMSEN, M., NIEBUHR, B. & WOOD, C.J. 2001. Early Cenomanian (Cretaceous) inoceramid bivalves from the Kronsberg Syncline (Hannover area, Lower Saxony, northern Germany): stratigraphic and taxonomic implications. Acta Geologica Polonica, 51, 121-136.
- WILMSEN, M., NIEBUHR, B., WOOD, C.J. & ZAWISCHA, D. 2007. Fauna and palaeoecology of the Middle Cenomanian Praeactinocamax primus Event at the type locality, Wunstorf quarry, northern Germany. Cretaceous Research, 28, 428-460.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BGPK-1773-6550