EVIDENCE OF PALAEOSEISMICITY IN THE KARSTIC CAVITIES OF THE GRANDS CAUSSES AS SHOWN IN THE AVEN DE LA PORTALERIE (LARZAC, AVEYRON, FRANCE)

Laurent BRUXELLES; Jean-Louis GUENDON; Yves QUINIF

Geologica Belgica

1374-8505 2034-1954

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Laurent BRUXELLES, Jean-Louis GUENDON & Yves QUINIF

EVIDENCE OF PALAEOSEISMICITY IN THE KARSTIC CAVITIES OF THE GRANDS CAUSSES AS SHOWN IN THE AVEN DE LA PORTALERIE (LARZAC, AVEYRON, FRANCE)

(volume 4 (2001) — number 3-4 - Karst & Tectonics)

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Bruxelles et al.pdf (9,8M)

Mots-clés : speleothem, KEYWORDS: palaeoseismicity, U/Th dating, aven de la Portalerie, Larzac, Aveyron, France.

Abstract

ABSTACT : Instrumental and historical seismicity data reveal that the Grands Causses are a seismically and tectonically stable area. Conventional neotectonic analysis methods give similar results. However, the Aven de la Portalerie on the Causse du Larzac does show some evidence of a degree of seismotectonic activity expressed by the presence of speleothem breaking. A large number of stalagmites have been broken off and the break often repaired by a subsequent growth of calcite. Stalagmitic floors have been fractured and displaced by fault movements occurring after their formation. This destruction would seem to have been caused by several earthquakes, since stalagmite fragments lying on the ground show that they had already been broken and built up again by several centimetres.

In this context of apparent stability, only the endokarst is capable of retaining and revealing evidence of relatively recent earthquakes whose chronological order can be established using various dating techniques.

Para citar este artículo

Laurent BRUXELLES, Jean-Louis GUENDON & Yves QUINIF, «EVIDENCE OF PALAEOSEISMICITY IN THE KARSTIC CAVITIES OF THE GRANDS CAUSSES AS SHOWN IN THE AVEN DE LA PORTALERIE (LARZAC, AVEYRON, FRANCE)», Geologica Belgica [En ligne], number 3-4 - Karst & Tectonics, volume 4 (2001), 187-195 URL : https://popups.uliege.be/1374-8505/index.php?id=2281.