Mathematics – Logic
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.103..241t&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 103, no. 1-4, April 1991, p. 241-256.
Mathematics
Logic
30
Cosmic Rays, Gaseous Diffusion, Geochronology, Helium Isotopes, Nuclear Reactions, Olivine, Basalt, Diffusivity, Grain Size, Quartz, Surface Diffusion
Scientific paper
The in situ production of He-3 in surface rocks (Hawaiian basalts and Antarctic quartzite) by cosmic-ray-induced nuclear reactions is found to provide an important geochronological tool. Helium loss is estimated by measuring cosmogenic He-3 diffusivities in quartz and olivine by incremental heating at 150-600 C. The low diffusivities obtained indicate that helium loss will not palpably affect cosmogenic helium exposure dating. In olivine, cosmogenic helium is determined to diffuse faster and with less temperature dependence than inherited He. He-3 and He-4 are measured in a quartz diffusion experiment, both isotopes showing smooth releases with time as expected for volume diffusion. It is found that the extent of helium retention depends greatly on both sample grain size and environmental temperature.
Jenkins William J.
Kurz Mark D.
Trull Thomas W.
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