Cosmogenic neon in recent lavas from the western United States

Details Cosmogenic neon in recent lavas from the western United States Cosmogenic neon in recent lavas from the western United States

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1863p&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 18, p. 1863-1866.

Physics

18

Cosmochemistry, Geochemistry, Lava, Neon Isotopes, Olivine, Feldspars, Helium Isotopes, Radioactive Age Determination

Scientific paper

Measurements of the absolute cosmogenic production of 21Ne and H3 in olivine for the well-dated Tabernacle Hill flow are reported. Values scaled to sea level and high latitude are 45 atoms/g yr for 21 NeC and 109 atoms/g yr for 3HeC for the past 17,800 yr. A ratio of 21NeC/3HeC of 0.41 +/- 0.05 is measured in olivines that have a range of 25 in cosmogenic exposure; there is no evidence of 3HeC loss in samples older than 100,000 yr. Volcanic plagioclase is shown to be a suitable mineral for cosmogenic 21HeC dating of surfaces. 21NeC in coexisting plagioclase and olivine phenocrysts have a constant ratio of 0.43 +/- 0.04 in samples with more than 10 exp 6 atoms of 21NeC. The production of 21NeC from 23Na is estimated at 160 +/- 50 atoms/g yr at 60 deg and sea level or equivalent to that on 24Mg.

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