High bedrock incision rates in the Atenguillo River valley, Jalisco, western Mexico

Auteur(s) et Affiliation(s)

RIGHTER, K.

Dep. Geology and Geophysics, Univ. California, Berkeley, Etats-Unis

Description :
Lava flows from 3 basaltic shield volcanoes preserve Pliocene-Pleistocene river levels in the Atenguillo River basin. K-Ar dates of these basalt flows, together with present and palaeoriver levels, allow calculation of bedrock incision rates at 3 points along the length of the Atenguillo River: Volcan La Laja, Volcan La Cienega, Volcan El Vigia. The high incision rates, as well as 2 distinct knickpoints along the profile of this river are related to a base level change at the northern end of the basin. The dynamics of this river basin are controlled by the ongoing process of continental fragmentation associated with the opening of the Gulf of California.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 1997, vol. 22, n°. 4, p. 337-343, Collation : Illustration, Références bibliographiques : 25 ref.

Date :
1997

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais