Cosmogenic neon in ultramafic nodules from Asia and in quartzite from Antarctica

Details Cosmogenic neon in ultramafic nodules from Asia and in quartzite from Antarctica Cosmogenic neon in ultramafic nodules from Asia and in quartzite from Antarctica

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.106...87s&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 106, no. 1-4, Sept. 1991, p. 87-102.

Computer Science

13

Abundance, Geochemistry, Helium Isotopes, Lithosphere, Neon Isotopes, Quartzite, Chemical Composition, Cosmic Rays, Gas Analysis, Volcanoes

Scientific paper

Results are presented of systematic analyses of both cosmogenic He-3(He-3 sub c) and cosmogenic Ne-21 (Ne-21 sub c) in ultramafic xenoliths from Central Asia and in a quartz sample from Antarctica. Five xenoliths, which show no or insignificant Ne-21 sub c excesses, were used to estimate the initial He-4/He-3 ratio of 90,470 in the subcontinental lithospheric mantle under the Baikal extension zone. The (He-3/Ne-21) sub c ratio in xenoliths with high Mg content is 1.41 +/-0.22. The same ratio in a quartz from Antarctica should be 4.5. The cosmogenic exposure ages of the analyzed xenoliths range between 7100 and 28,000 years. The quartz BW 84-105 has He-3 sub c and Ne-21 sub c exposure ages of 1.35 and 2.21 Ma, respectively. It is inferred that in samples with relatively high diffusion coefficients for cosmogenic noble gases, as, for example, quartz BW 84-105, Ne-21 sub c exposure ages are more reliable than He-3 sub c exposure ages, due to smaller or negligible diffusive losses of Ne-21 sub c.

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