Study of rare gases in geothermal waters from Herculane area, Romania

Cosma, C. and Ristoiu, D. (1999) Study of rare gases in geothermal waters from Herculane area, Romania. Il nuovo cimento C, 22 C (3-4). pp. 317-324. ISSN 1826-9885

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In the south-western part of Romania there is a long and deep fissure following the Cerna river canyon as well as many transversal fissures, especially placed in the region of Herculane Spa. The geothermal water sources (springs and drillings), always accompanied by large amounts of gases, are located where these fissures cross. The presence of granite rocks at the surface is another remarkable characteristic of this area. Nitrogen and methane are the main components of emanated gases, and high helium and radon concentrations were also found. The composition of the gases was determined by using a Dempster mass spectrometer. The radon content from these gases and the rate of radon exhalation from the ground were determined by gamma spectrometry method. The argon isotopes were analyzed by means of a quadrupole mass spectrometer (AMP-4). In the vicinity of transversal fissures, the radon exhalation rates present higher values from all measurements in this area. The ratio 4HeO20NeD400 is a very good indicator of the fact that these gases are not contaminated with atmospheric air and therefore the gases come from depth. The 4HeO40Ar and 40ArO36Ar ratios suggest that the helium in these sources may have a non-negligible part of primordial helium arising from the earth mantle.

Item Type: Article
Additional Information: Paper presented at the “Fourth International Conference on Rare Gas Geochemistry”, Rome, October 8-10, 1997.
Uncontrolled Keywords: Interactions between exterior sources and interior properties; volcanology; phenomena related to earthquake prediction; conference proceedings
Subjects: 500 Scienze naturali e Matematica > 550 Scienze della Terra
Depositing User: Marina Spanti
Date Deposited: 10 Oct 2019 07:02
Last Modified: 10 Oct 2019 07:02

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