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PORTAIL D'INFORMATION GÉOGRAPHIQUE

The Alemania rockfall dam : a record of a mid-holocene earthquake and catastrophic flood in northwestern Argentina

Auteur :
WAYNE, W.J.

Description :
A prehistoric rockfall, probably caused by an earthquake, blocked Río de las Conchas 2 km upstream from Alemanía (Salta Province, Argentina) in the southern part of the Cordillera Oriental. The rockfall created a dam that formed a lake at least 16 km long. Shells of Biomphalaria, preserved in the lake sediments and, dated by radiocarbon, established the time of this event to be about 5500-6000 years ago. When the natural dam failed, probably either by piping or overtopping, the lake drained catastrophically, eroding a trench through the chaotic mass of sandstone rubble.


Type de document :
Article de périodique

Source :
Geomorphology (Amsterdam), issn : 0169-555X, 1999, vol. 27, n°. 3-4, p. 295-306, Collation : Illustration, Références bibliographiques : 27 ref.

Date :
1999

Editeur :
Pays édition : Pays-Bas, Amsterdam, Elsevier

Langue :
Anglais
Droits :
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