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| Titel |
Application of natural isotope tracers to geothermal research in the Maechan fault zone (N Thailand) |
| VerfasserIn |
Monthon Yongprawat, Kiatipong Kamdee, Martin Sauter, Bettina Wiegand |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149995
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| Publikation (Nr.) |
 EGU/EGU2017-14412.pdf |
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| Zusammenfassung |
| Previous geothermal research in Thailand has mainly focused on high-potential geothermal
systems such as the active Maechan fault zone, which is located in the northern part of the
country. Fang and Maechan hot springs have been the primary targets for power generation
and agricultural applications (Apollaro et al. 2015).
Here we present a comprehensive survey of chemical and isotopic compositions of
thermal waters from six hot springs, well water, and cold surface water samples. This study
aims to identify sources of the geothermal waters, hydrodynamic processes and the thermal
capacity of the hot springs along the Maechan fault zone. Field parameters, major ions, stable
isotopes of hydrogen, oxygen, and carbon, as well as radiocarbon and tritium were
investigated.
The chemical composition of both thermal waters and cold surface waters is
dominated by the Na-HCO3 type. δ2HSMOW and δ18OSMOW data of thermal
water and cold surface water plot along a local meteoric water line, suggesting local
precipitation as the source of thermal water in the area. δ13CPDB values between -4
to -16 ‰ indicate that dissolved carbon in the thermal water samples is mainly
from inorganic carbon sources but some mixture with organic carbon may occur.
Radiocarbon analyses (10-20 pMC) suggest ages of more than 10,000 years for
the formation of the thermal waters. Tritium concentrations range between 0-0.2
TU.
Bibliography
Apollaro, C., Vespasiano, G., De Rosa, R., Marini, L. Use of Mean Residence
Time and Flowrate of Thermal Waters to Evaluate the Volume of Reservoir Water
Contributing to the Natural Discharge and the Related Geothermal Reservoir Volume.
Application to Northern Thailand Hot Springs.” Geothermics 58: 62–74. 2015. |
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