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

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

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.2695p&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 55, Sept. 1991, p. 2695-2698. Research supported by Barringer Crater Co.

Physics

26

Carbon 14, Chlorine, Dolomite (Mineral), Meteorite Craters, Radioactive Age Determination, Metamorphism (Geology), Quartz, Thermoluminescence

Scientific paper

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

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