Computer Science
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..91...73s&link_type=abstract
Earth and Planetary Science Letters, Volume 91, Issue 1-2, p. 73-88.
Computer Science
135
Scientific paper
Very large neon isotopic anomalies have been accurately measured in mid-ocean ridge basalt glassy samples from diverse locations worldwide. Values for 20Ne/22Ne range up to ~ 13 and 21Ne/22Ne values range up to ~ 0.07 (present atmospheric values are 20Ne/22Ne = 9.8 and 21Ne/22Ne = 0.029). The data are highly correlated in the 20Ne/22Ne-21Ne/22Ne diagram, independent of sample location. Loihi seamount data show an atmospheric neon isotopic composition, which is consistent with previous He-Ar-Xe data and their interpretation as representative of a deep undegassed mantle source. Recent mixing within the mantle best explains the neon isotopic features, as well as the He-Ne-Ar-Xe relationships. We propose that the MORB 21Ne/22Ne anomalies are due to nuclear reactions within the mantle. The origin of the 20Ne/22Ne anomalies however cannot be explained in a straightforward way and we discuss several scenarios.
Allègre Claude J.
Sarda Philippe
Staudacher Thomas
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