Computer Science
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.113..553b&link_type=abstract
Earth and Planetary Science Letters, Volume 113, Issue 4, p. 553-567.
Computer Science
10
Scientific paper
The abundances and isotopic compositions of He and Ne have been determined in various hydrocarbon gas reservoirs within the Vienna Basin, Austria. These continental gases are the first in which mantle-derived Ne has been resolved. They allow a comparison of the estimated mantle He/Ne ratio with that observed in basalts at mid-ocean ridges. Between 1.9% and 28% of the 4He within these samples is mantle derived, the remainder is crustal-radiogenic. The contribution of mantle-derived 21Ne to the total 21Ne content ranges from < 3% to 34%, the contribution of 21Ne produced nucleogenically in the crust ranges from 0% to 40%. The remaining Ne is atmospheric in origin.
21Ne/22Ne and 20Ne/22Ne ratios, corrected for atmosphere-derived contributions, correlate with the measured R/Ra values. Analyses define a single hyperbolic mixing line between mantle and crustal-radiogenic isotopic end members. This line is defined by the constant [4He/22Ne]rad/[4He/22Ne]mn1l = 94.7 +/- 9.4. For a crustal [4He/22Ne]rad ratio of 7.61 × 106 [1] the ratio [4He/22Ne]mn1l = 8.04 × 104 for the Vienna Basin gases. This is a factor of 11.3 times lower than the best estimate of the mantle value [4He/22Ne]mn1l = 9.10 × 105, measured in mid-ocean ridge basalts [2]. The magnitude of the mantle Ne enrichment in the Vienna Basin gases cannot be accounted for either by melt formation or degassing and must reflect either the transport of the mantle volatiles through the continental lithosphere or a mantle source relatively enriched in Ne over He.
Ballentine Chris J.
Keith O'Nions R.
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