Cyclostratigraphy of the Middle to Upper Ordovician successions of the Armorican Massif (western France) using portable X-ray fluorescence
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Published:2022-05-16
Issue:1
Volume:4
Page:251-267
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ISSN:2628-3719
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Container-title:Geochronology
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language:en
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Short-container-title:Geochronology
Author:
Sinnesael MatthiasORCID, Loi Alfredo, Dabard Marie-Pierre, Vandenbroucke Thijs R. A., Claeys PhilippeORCID
Abstract
Abstract. To expand traditional cyclostratigraphic numerical
methods beyond their common technical limitations and apply them to truly
deep-time archives, we need to reflect on the development of new approaches
to sedimentary archives that are not traditionally targeted for
cyclostratigraphic analysis but that frequently occur in the impoverished
deep-time record. Siliciclastic storm-dominated shelf environments are a
good example of such records. Our case study focuses on the Middle to Upper
Ordovician siliciclastic successions of the Armorican Massif (western
France) that are well-studied examples in terms of sedimentology and sequence
stratigraphy. In addition, these sections are protected geological heritage
due to the extraordinary quality of the outcrops. We therefore tested the
performance of non-destructive high-resolution (centimeter-scale) portable X-ray
fluorescence and natural gamma-ray analyses on an outcrop to obtain major
and trace element compositions. Despite the challenging outcrop conditions
in the tidal beach zone, our geochemical analyses provide useful information
regarding general lithology and several specific sedimentary features such
as the detection of paleo-placers or the discrimination between different
types of diagenetic concretions such as nodules. Secondly, these new
high-resolution data are used to experiment with the application of commonly
used numerical cyclostratigraphic techniques on this siliciclastic
storm-dominated shelf environment, a non-traditional sedimentological
setting for cyclostratigraphic analysis. In the parts of the section with a
relatively homogeneous lithology, spectral power analyses and bandpass
filtering hint towards a potential astronomical imprint of some sedimentary
cycles, but this needs further confirmation in the absence of more robust
independent age constraints.
Funder
Vrije Universiteit Brussel Universiteit Gent Koning Boudewijnstichting Fondazione Banco di Sardegna Fonds Wetenschappelijk Onderzoek European Research Council
Publisher
Copernicus GmbH
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