Physics
Scientific paper
Dec 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36.1321m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 36, Issue 12, pp.1321-1336
Physics
23
Scientific paper
One cm 3 samples of thermal waters were analyzed mass spectrometrically for their dissolved He, Ne, Ar, Kr and Xe. The isotopic abundances of the four heavier gases are atmospheric and their concentrations equal those of air-equilibrated waters at 16-22°C. The waters contain up to 2700 × 10 -8 cm 3 STP radiogenic He/cm 3 STP water. The data showed: 1. (a) the thermal waters studied originated from meteoric waters that entered the ground, 2. (b) While they entered the ground (in periods up to 30,000 years ago according to C-14 dating) the average temperature in the region was rather close to the present one, i.e. around 19 ± 4° C . 3. (c) The dissolved noble gases were not lost in the ground although the waters had been heated in some cases up to 63°C for thousands of years. The present data support the reliability of the noble gas method for determining original surface paleotemperatures of ancient meteoric waters. Radiogenic He excess is a potential indicator for ancient waters along with Ra excess and low C-14 contents.
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