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Article: K-Ar and ^sup 40^Ar/^sup 39^Ar geochronology of supergene processes in the Atacama Desert, Northern Chile: tectonic and climatic relations
- Article from:
- Journal of the Geological Society
- Article date:
- January 1, 2006
- Author:
CopyrightCopyright Geological Society Publishing House Jan 2006. Provided by ProQuest LLC. (Hide copyright information)
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Abstract:
New K-Ar and ^sup 40^Ar/^sup 39^Ar data obtained for 29 samples of supergene alunite-, jarosite- and hollandite-group minerals from the Central Depression of Northern Chile document almost continuous supergene oxidation from 33 to 9 Ma. The downward migration of supergene oxidation zones is used to calculate maximum denudation rates of 16-35 m Ma^sup -1^. These calculated rates are sensitive to pre-existing topography and show that the present relief observed in the Central Depression represents a modified Miocene landscape. The results presented here are in good agreement with previously published geochronological data for the Atacama Desert. The combination of all published ...
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