Tritium corrected 14 C and atmospheric noble gas corrected 4 He applied to deduce ages of mixed groundwaters: Examples from the Baden region, Switzerland

Details Tritium corrected 14 C and atmospheric noble gas corrected 4 He applied to deduce ages of mixed groundwaters: Examples from the Baden region, Switzerland Tritium corrected 14 C and atmospheric noble gas corrected 4 He applied to deduce ages of mixed groundwaters: Examples from the Baden region, Switzerland

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1611m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 8, pp.1611-1618

Computer Science

2

Scientific paper

Mixing of recent water (post-1953) and old water (up to a limit of 25,000 years) can be identified by tritium and 14 C values. The age of an old endmember may be deduced, applying a tritium correction to the measured 14 C value. 4 He may be used as a second semi-quantitative age indicator of old groundwaters, overlapping the 14 C range and extending beyond it. Tritium may be used to deduce the radiogenic 4 He concentration in the old endmember. In addition, the atmospheric noble gases may be used to check He retention and to correct for losses. The corrected 14 C and 4 He values may be used to check concordance between computed ages in mixed and unmixed groundwaters. Concordant ages indicate that the basic dating premises were not violated, whereas discordant ages indicate that secondary processes were active. The suggested approach is demonstrated for a number of springs and wells studied in the regions of Baden and Yverdon, Switzerland.

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