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Gradient analysis of reversed treelines and grasslands of the Valles Caldera, New Mexico

โœ Scribed by Jonathan D. Coop; Thomas J. Givnish

Book ID
111277157
Publisher
Opulus Press
Year
2007
Tongue
English
Weight
877 KB
Volume
18
Category
Article
ISSN
1100-9233

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ESR dating was made at the Valles caldera by using the Al center and Ti center in quartz grains separated from the layers of the Valles Rhyolite. Obtained ESR ages were much younger than those by other methods (fission track and 39Ar-40Ar). A reported thermal event of about lo-40 ka ago might explai