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The astronomical calibration of the Givetian (Middle Devonian) timescale (Dinant Synclinorium, Belgium)
De Vleeschouwer, David; Boulvain, Frédéric; Da Silva, Anne-Christine et al.
2015In Da Silva, Anne-Christine; Whalen; Hladil et al. (Eds.) Magnetic Susceptibility Application: A Window onto Ancient Environments and Climatic Variations
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Abstract :
[en] Recent advances in radiometric dating result in significant improvements in the geological timescale and provide better insight into the timing of various processes and evolutions within the Earth’s system. However, no radiometric ages are contained within the Givetian. Consequently, the absolute ages of the Givetian Stage boundaries, as well as the stage’s duration, remain poorly constrained. As an alternative, the analysis of sedimentary cycles allows for the estimation of the duration of this stage. We examined the high-resolution magnetic susceptibility signals of four Givetian outcrops in the Givet area for a possible astronomical imprint, to fully understand the rates of evolutionary and environmental change. All four sections are firmly correlated and wavelet analyses of the magnetic susceptibility signals reveal the imprint of astronomical eccentricity forcing. The highly stable 405 kyr cycles constrain the duration of the Givetian Stage at 4.35+0.45 Myr, which is in good agreement with the International Chronostratigraphic Chart (5.0 Myr). The studied sections also exhibit an imprint of obliquity, suggesting a climatic teleconnection between low and high latitudes. The corresponding microfacies curves demonstrate similar astronomical imprint, and thereby indicate that the observed 10 5year-scale cyclicity is the result of climatic and environmental change
Disciplines :
Earth sciences & physical geography
Author, co-author :
De Vleeschouwer, David
Boulvain, Frédéric  ;  Université de Liège - ULiège > Département de géologie > Pétrologie sédimentaire
Da Silva, Anne-Christine  ;  Université de Liège - ULiège > Département de géologie > Pétrologie sédimentaire
Pas, Damien ;  Université de Liège - ULiège > Département de géologie > Pétrologie sédimentaire
Labaye, Corentin
Claeys, Philippe
Language :
English
Title :
The astronomical calibration of the Givetian (Middle Devonian) timescale (Dinant Synclinorium, Belgium)
Publication date :
2015
Main work title :
Magnetic Susceptibility Application: A Window onto Ancient Environments and Climatic Variations
Author, co-author :
Da Silva, Anne-Christine  ;  Université de Liège - ULiège > Geology
Whalen
Hladil
Chadimova
Chen
Spassov
Boulvain, Frédéric  ;  Université de Liège - ULiège > Geology
Devleeschouwer
Publisher :
Lyell
Collection name :
Geological Society, London, Special Publications, 414
Pages :
245-256
Peer reviewed :
Peer reviewed
Name of the research project :
IGCP 580
Funders :
FWO - Fonds Wetenschappelijk Onderzoek Vlaanderen [BE]
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