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Numerical ages of Holocene tributary debris fans inferred from dissolution pitting on carbonate boulders in the Grand Canyon of Arizona

Auteurs :
HEREFORD, R.
THOMPSON, K.S.
BURKE, K.J.

Description :
In this paper, ages of debris-fan are estimated from linear relation between surface age and the average depth of dissolution pits on carbonate boulders, beside the Colorado River in Grand Canyon National Park. Dissolution pits result from a combination of weakly acidic rainfall and the metabolic activity of blue-green algae. The average depth of dissolution pits increases with relative age of fan surfaces. If not the result of differential preservation of fan surfaces, the clustering implies periods of heightened debris-flow activity and increased precipitation.


Type de document :
Article de périodique

Source :
Quaternary research, issn : 0033-5894, 1998, vol. 50, n°. 2, p. 139-147, Collation : Illustration, Références bibliographiques : 36 ref.

Date :
1998

Editeur :
Pays édition : Etats-Unis, San Diego, CA, Elsevier

Langue :
Anglais
Droits :
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