Cosmic-ray produced neon in Antarctic rocks

Details Cosmic-ray produced neon in Antarctic rocks Cosmic-ray produced neon in Antarctic rocks

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..203g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Feb. 1991, p. 203-206. Research supported by the University of Californi

Mathematics

Logic

13

Antarctic Regions, Cosmic Rays, Neon Isotopes, Rocks, Earth Atmosphere, Helium Isotopes, Nuclear Transformations, Radioactive Isotopes

Scientific paper

Three Antarctic rocks and quartz separates thereof for their records of cosmic-ray produced Ne-21. All three samples reveal an excess of Ne-21 and in two of them a cosmic-ray origin is documented by the spallation ratios Ne-22/Ne-21. He-3 is shown to be incompletely retained in quartz (less than 10 percent). Previous studies have shown the suitability of quartz as a monitor for cosmic-ray produced radionuclides Be-10 and Al-26, and therefore as a tracer for geological processes. Al-26/Be-10 ratios allow the calculation of minimum exposure ages and maximum erosion rates, and measured ratios Ne-21/Be-10 and Ne-21/Al-26 add significant information to exposure histories, especially in the case of a complex exposure. This information is necessary for an evaluation of erosion rates and to define geological processes, such as uplift and variations ih the Antarctic ice cover.

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