Physics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.119..405s&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 119, no. 3, p. 405-417
Physics
13
Cosmology, Earth (Planet), Helium Isotopes, Neon Isotopes, Olivine, Volcanoes, Basalt, Erosion, Planetary Evolution, Radioactive Age Determination, Rocks
Scientific paper
We report analyses of both helium and neon for olivine separates from a drill core at an altitude of 2330 m in oceanic at Piton de la Fournaise volcano. We show for the first time that cosmogenic Ne-21, like cosmogenic He-3, decreases exponentially with core depth. We obtain an attenuation length of 165 +/- 6 g/sq cm (1 sigma) for cosmogenic Ne-21, identical to the value found previously for cosmogenic He-3 alone. For each depth in the core, the measured amount of cosmogenic Ne-21 is about 13% lower than predicted based on the high precision K-Ar age of 65,200 +/- 2000 yrs (1 sigma), and this result is attributed to erosion. Assuming a constant erosion rate, we derive a value of 3.5 +/- 1.7 mm/yr (1 sigma) from the Ne-21 data, the same order of magnitude as the value obtained from cosmogenic He-3 at Haleakala. This work highlights the important potential of both cosmogenic helium and neon for measuring in-situ exposure ages and erosion rates.
Allègre Claude J.
Lecomte Andre
Sarda Philippe
Staudacher Thomas
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