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| Titel |
Dissolved gas concentrations of the geothermal fluids in Taiwan |
| VerfasserIn |
Ai-Ti Chen, Tsanyao Frank Yang |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250038420
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| Zusammenfassung |
| Taiwan, a geologically active island, is located on the boundary of the Philippine Sea Plate
and the Eurasian Plate. High heat flow and geothermal gradient generated by the complex
collision and orogeny, warm up the meteoric water and/or the ground water. The heated water
becomes geothermal fluids. In previous studies, researchers tried to categorize hot springs
based on the appearance, chemical compositions and lithological areas. Because of the
chemical inertness, the concentrations and isotopic composition of dissolved noble gases
are good indicators of the mantle degassing, geothermal conditions, and so on.
In this study, 55 hot springs were collected from different tectonic units. It is the
first time to systematically study the hot springs in Taiwan in terms of dissolved
gases.
Hot spring water is sampled and stored in pre-evacuated glass bottles for analyzing gas
compositions. The abundances of noble gases were determined by a quadrupole mass
spectrometer based on the isotope dilution technique. Samples with glass vials are introduced
to RAD 7 and GC for dissolved Rn and major dissolved gases analyses. Furthermore, helium
isotopic ratios and helium-neon ratios are measured on a conventional noble gas mass
spectrometer. For hydrochemistry analysis, water samples are analyzed by IC, ICP-MS and
titration.
We can classify the hot springs samples into three major groups from main anion
concentration data; and then, subdivide them into nine minor groups by cation concentration
data. Moreover, according to major dissolved gases compositions, three major gas
components: CH4, N2 and CO2, are identified. Dissolved noble gases provided more detailed
clues about hot springs sources in Taiwan, such as the degree of mixing between
meteoric water and deep-source water, which will be further discussed in this study. |
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