Géomorphologie et variations globales du niveau de la mer
Abstracts
Former subaerial landforms are the most commonly used marker for locating the paleo-shorelines, in order to detect global sea-level change.
However, such a geomorphological survey presents some difficulties because of agricultural arrangements or natural erosion affecting loose marine siliciclastic sediments, even before the setting of slope deposits.
But other geomorphological approach is possible. It consists to identify the former buried landforms, which are carved by terrestrial or marine erosion into an uplifting tectonic continental plate, and support the transgressive sediments package of each successive marine terrace deposit.
The creation of these landforms, and their fossilization, are the result of a succession of sea-level fallings and sea-level rises, even if at a millenial-scale, where the rate of sea-level change and the resulting water-depth, control marine erosion and wave-induced shape-sorting processes.
This approach also has somewhat to say about Last Interglacial and Termination II millenial-scale sea level variability.
Index terms
Index de mots-clés :
anciennes formes de terrain fossiles, géomorphologie, variations du niveau de la mer à l'échelle du millénaireFull text
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References
Electronic reference
Pierre Guérémy, “Géomorphologie et variations globales du niveau de la mer”, Physio-Géo [Online], Volume 7 | 2013, Online since 05 May 2013, connection on 29 March 2024. URL: http://journals.openedition.org/physio-geo/3333; DOI: https://doi.org/10.4000/physio-geo.3333
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