Mass spectrometric identification of cosmic-ray-produced neon in terrestrial rocks with multiple neon components

Details Mass spectrometric identification of cosmic-ray-produced neon in terrestrial rocks with multiple neon components Mass spectrometric identification of cosmic-ray-produced neon in terrestrial rocks with multiple neon components

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.118...65n&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 118, no. 1-4, p. 65-73.

Mathematics

Logic

25

Cosmic Rays, Geomorphology, Glaciology, Mass Spectroscopy, Neon, Nuclides, Rocks, Activation Energy, Quartz, Rare Gases, Spallation

Scientific paper

Studies of cosmic-ray-produced nuclides in terrestrial rocks are expected to provide important geomorphological and glaciological information, such as surface exposure ages, erosion rates and extent of glacial cover. In the case of the stable nuclide Ne-21, the cosmic-ray-produced component may represent but one of several components, and a component resolution based on three-isotope correlations is essential. We developed analytical techniques which permit accurate corrections for all interfering ions. We show (for our modified Nier source) that corrections for doubly charged species based on constant charge state ratios are not satisfactory. The improved techniques permit isotopic studies of less than 10 exp 6 atoms of Ne-21. The spallation ratio (Ne-22/Ne-21)c from Si was calibrated using a quartz separate from an Allan Hills sandstone, yielding a value of 1.243 +/- 0.022. This ratio is expected to be essentially constant for terrestrial quartz samples and should be useful in component resolutions. The stepwise release of Ne at increasing temperatures shows that cosmic-ray-produced Ne is released from quartz at rather low temperatures. This permits an estimate of the activation energy for Ne diffusion in quartz (90 +/- 10 kJ/mol).

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