A new magnetostratigraphic framework for the Lower Miocene (Burdigalian/Ottnangian, Karpatian) in the North Alpine Forel
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A new magnetostratigraphic framework for the Lower Miocene (Burdigalian/Ottnangian, Karpatian) in the North Alpine Foreland Basin Bettina Reichenbacher • Wout Krijgsman • Yannick Lataster • Martina Pippe`rr • Christiaan G. C. Van Baak • Liao Chang • Daniel Ka¨lin • Ju¨rg Jost • Gerhard Doppler • Dietmar Jung • Je´roˆme Prieto • Hayfaa Abdul Aziz • Madelaine Bo¨hme • Jennifer Garnish Uwe Kirscher • Valerian Bachtadse
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Received: 11 March 2013 / Accepted: 9 August 2013 / Published online: 16 November 2013 Ó Swiss Geological Society 2013
Abstract Oligocene–Miocene chronostratigraphic correlations within the Paratethys domain are still highly controversial. This study focuses on the late Early Miocene of the Swiss and S-German Molasse Basin (Late Burdigalian, Ottnangian–Karpatian). Previous studies have published different chronologies for this time interval that is represented by the biostratigraphically well constrained Upper Marine Molasse (OMM, lower and middle Ottnangian), Upper Brackish Molasse (OBM, Grimmelfingen and Kirchberg Formations, middle and upper Ottnangian to lower Karpatian, MN 4a–MN 4b) and Upper Freshwater Editorial handling: C. Pirkenseer & D. Marty.
Electronic supplementary material The online version of this article (doi:10.1007/s00015-013-0142-8) contains supplementary material, which is available to authorized users. B. Reichenbacher (&) M. Pippe`rr J. Prieto J. Garnish Department of Earth- and Environmental Sciences, Palaeontology and Geobiology, Ludwig-Maximilians-University, Richard-Wagner-Strasse 10, 80333 Munich, Germany e-mail: [email protected] W. Krijgsman (&) Y. Lataster C. G. C. Van Baak L. Chang Paleomagnetic Laboratory ‘‘Fort Hoofddijk’’, Department of Earth Sciences, Utrecht University, Budapestlaan 17, 3584 CD Utrecht, The Netherlands e-mail: [email protected] D. Ka¨lin Bundesamt fu¨r Landestopographie swisstopo, Geologische Landesaufnahme, Seftigenstrasse 264, 3084 Wabern, Germany J. Jost Ba¨renhubelstrasse 10, 4800 Zofingen, Switzerland
Molasse (OSM, Karpatian–Badenian, MN 5). Here, we suggest a new chronostratigraphic framework, based on integrated magneto-litho-biostratigraphic studies on four sections and three boreholes. Our data indicate that the OBM comprises chrons 5D.1r and 5Dn (Grimmelfingen Fm), chron 5Cr (lower Kirchberg Fm) and the oldest part of chron 5Cn.3n (upper Kirchberg Fm). The OSM begins during chron 5Cn.3n, continues through 5Cn, and includes a long reversed segment that can be correlated to chron 5Br. The OMM-OSM transition was completed at 16.0 Ma in the Swiss Molasse Basin, while the OBM-OSM changeover ended at 16.6 Ma in the S-German Molasse Basin. As the lower Kirchberg Fm represents a facies of the Ottnangian, our data suggest that the Ottnangian–Karpatian boundary in the Molasse Basin is approximately at 16.8 Ma, close to the 5Cr–5Cn.3n magnetic reversal, and G. Doppler Bayerisches Landesamt fu¨r Umwelt, Dienststelle Augsburg, Haunstetter Straße 112, 86161 Augsburg, Germany D. Jung Bayerisches Landesamt fu¨r Umwelt, Di
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