Abstract
This study uses an integrated approach, including sedimentology, geochemistry and hysteresis magnetic measurements on a million year Givetian sequence in the southern margin of the Ardennes carbonate platform (France) to test the reliability of magnetic susceptibility () records as inter-regional correlation tools in remagnetized settings. Furthermore, we aim to better understand the N-S depositional variations and sea-level fluctuations in the Ardennes. Sedimentological analyses revealed a complex platform evolution displaying a variety of shallow- and off-reef paleoenvironmental rocks, which ultimately allowed us to improve the sedimentological model of this area and to constrain the main sea-level fluctuations within the southern margin of the Ardennes platform. Comparison of the curve of this succession with previously published time-equivalent records in the western margin of the platform indicates a clear correlation between the two areas, despite the distance between the locales, their different sedimentology background and the remagnetization affecting the entire region. In contrast, the comparison of these profiles from the Ardennes (SW Rhenohercynian Massif, Belgian and France) with coeval data from the Rheinisches Schiefergebirge (NE Rhenohercinian Massif, Germany) do not show obvious correlations. Therefore, it is inferred that syn-sedimentary autogenic processes (e.g., vicinity to landmasses, wave agitation), which operate at small spatial and temporal scales affected the signal and could cause the lack of correlation between profiles.
Highlights
Magnetic susceptibility is a proxy that has been broadly used for paleoenvionmental and correlation purposes in ancient sedimentary records (Ellwood et al, 2001; Bábek et al, 2007; Whalen and Day, 2008; 2010; Hladil et al, 2011; Da Silva et al, 2013; Chadimova et al, 2015)
The relatively good correlation between the χ signal and the chemostratigraphic profiles for both the La Thure (LT) and FF sections indicates that the primary detrital signal is reasonably well preserved in these sections, implying that the primary χ trends could have been retained despite diagenetic or very low grade metamorphic imprints related to burial and remagnetization
For each section investigated in this study we explored the link between average χ signal and syn-sedimentary parameters such as wave agitation, carbonate productivity/sedimentation rate and the vicinity to landmasses through the qualitative comparison with facies belts/microfacies
Summary
Magnetic susceptibility is a proxy that has been broadly used for paleoenvionmental and correlation purposes in ancient sedimentary records (Ellwood et al, 2001; Bábek et al, 2007; Whalen and Day, 2008; 2010; Hladil et al, 2011; Da Silva et al, 2013; Chadimova et al, 2015). Multiple proxies, such as sedimentology, geochemistry and hysteresis magnetic measurements are generated from the million year Fromelennes-Flohimont section in France (southern margin of the Ardennes platform). These data are integrated with previously published data from the northern margin of the Ardennes platform [La Thure (LT) section] which include facies, geochemistry (Pas et al, 2017) and magnetic susceptibility analyses (De Vleeschouwer et al, 2015). The χ record from the Fromelennes-Flohimont section is compared with time equivalent published records in the Belgian LT and the German Burgberg sections
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