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    Late Burdigalian sea retreat from the North Alpine Foreland Basin: new magnetostratigraphic age constraints

    Access Status
    Fulltext not available
    Authors
    Sant, K.
    Kirscher, Uwe
    Reichenbacher, B.
    Pippèrr, M.
    Jung, D.
    Doppler, G.
    Krijgsman, W.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Sant, K. and Kirscher, U. and Reichenbacher, B. and Pippèrr, M. and Jung, D. and Doppler, G. and Krijgsman, W. 2017. Late Burdigalian sea retreat from the North Alpine Foreland Basin: new magnetostratigraphic age constraints. Global and Planetary Change. 152: pp. 38-50.
    Source Title
    Global and Planetary Change
    DOI
    10.1016/j.gloplacha.2017.02.002
    ISSN
    0921-8181
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/48976
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Elsevier B.V.Accurate reconstruction of the final sea retreat from the North Alpine Foreland Basin (NAFB) during the Burdigalian (Early Miocene) is hampered by a lack of reliable age constraints. In this high resolution magnetostratigraphic study we try to solve a significant age bias for the onset of the Upper Freshwater Molasse (OSM) deposition in the neighboring S-German and Swiss Molasse Basins. We measured > 550 samples from eleven drill cores covering the transition from marine to brackish to freshwater environments in the S-German Molasse Basin. Based on combined bio-, litho- and magnetostratigraphic constraints, the composite magnetostratigraphic pattern of these cores provides two reasonable age correlation options (model 1 and 2). In model 1, the base of the brackish succession lies within Chron C5Cr (~ 16.7–17.2 Ma), and the onset of OSM deposition has an age of ~ 16.5 Ma. Correlation model 2 suggests the transition to brackish conditions to be within C5Dr.1r (~ 17.7–17.5 Ma), and yields an age around 16.7 Ma for the shift to the OSM. Most importantly, both models confirm a much younger age for the OSM base in the study area than previously suggested. Our results demonstrate a possible coincidence of the last transgressive phase (Kirchberg Fm) with the Miocene Climatic Optimum (model 1), or with the onset of this global warming event (model 2). In contrast, the final retreat of the sea from the study area is apparently not controlled by climate change.

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