Climate, tectonics, and the morphology of the Andes

Citation
Dr. Montgomery et al., Climate, tectonics, and the morphology of the Andes, GEOLOGY, 29(7), 2001, pp. 579-582
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
GEOLOGY
ISSN journal
0091-7613 → ACNP
Volume
29
Issue
7
Year of publication
2001
Pages
579 - 582
Database
ISI
SICI code
0091-7613(200107)29:7<579:CTATMO>2.0.ZU;2-H
Abstract
Large-scale topographic analyses show that hemisphere-scale climate variati ons are a first-order control on the morphology of the Andes. Zonal atmosph eric circulation in the Southern Hemisphere creates strong latitudinal prec ipitation gradients that, when incorporated in a generalized index of erosi on intensity, predict strong gradients in erosion rates both along and acro ss the Andes. Cross-range asymmetry, width, hypsometry, and maximum elevati on reflect gradients in both the erosion index and the relative dominance o f fluvial, glacial, and tectonic processes, and show that major morphologic features correlate with climatic regimes. Latitudinal gradients in inferre d crustal thickening and structural shortening correspond to variations in predicted erosion potential, indicating that, like tectonics, nonuniform er osion due to large-scale climate patterns is a first-order control on the t opographic evolution of the Andes.