Cyclic aggradation and downcutting, fluvial response to volcanic activity, and calibration of soil-carbonate stages in the western Grand Canyon, Arizona

Auteurs :
LUCCHITTA, I.
CURTIS, G.H.
DAVIS, M.E.
DAVIS, S.W.
TURRIN, B.

Description :
In the western Grand Canyon, fluvial terraces and pediment surfaces, both associated with a Pleistocene basalt flow, document Quaternary aggradation and downcutting by the Colorado River, illuminate the river's response to overload and the end of overload, and allow calibration of soil-carbonate stages and determination of downcutting rates. Four downcutting-aggradation cycles are present. The current downcutting rate, 11-14m/1000 yr, likely is a response both to the end of late Pleistocene and early Holocene overload and to the reduction of sediment supply caused by Glen Canyon Dam.


Type de document :
Article de périodique

Source :
Quaternary research, issn : 0033-5894, 2000, vol. 53, n°. 1, p. 23-33, Collation : Illustration, Références bibliographiques : 26 ref.

Date :
2000

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