Age and geomorphic history of Meteor Crater, Arizona, from cosmogenic 36Cl and 14C in rock varnish

Fred M. Phillips, Marek G. Zreda, Stewart S. Smith, David Elmore, Peter W. Kubik, Ronald I. Dorn, David J. Roddy

Research output: Contribution to journalArticle

71 Scopus citations

Abstract

Using cosmogenic 36Cl buildup and rock varnish radiocarbon, we have measured the exposure age of rock surfaces at Meteor Crater, Arizona. Our 36Cl measurements on four dolomite boulders ejected from the crater by the impact yield a mean age of 49.7 ± 0.85 ka, which is in excellent agreement with an average age of 49 ± 3 ka obtained from thermoluminescence studies on shock-metamorphosed dolomite and quartz. These ages are supported by undetectably low 14C in the oldest rock varnish sample.

Original languageEnglish (US)
Pages (from-to)2695-2698
Number of pages4
JournalGeochimica et Cosmochimica Acta
Volume55
Issue number9
DOIs
StatePublished - Sep 1991
Externally publishedYes

ASJC Scopus subject areas

  • Geochemistry and Petrology

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