Distribution of 222Rn and CO2 across faults and its origin in Wayang Windu geothermal area, West Java - Indonesia

•Series of soil gasses measurements (222Rn, CO2 and δ13C) had been performed in Wayang Windu geothermal field, Indonesisa to infer permeability of fault structures.•High and anomaly of soil gasses concentration (222Rn and CO2) were correlated with several segments of fault structures.•The δ13C value...

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Bibliographic Details
Published in:Geothermics 2023-05, Vol.110, p.102691, Article 102691
Main Authors: Prasetio, Rasi, Hutabarat, Johanes, Daud, Yunus, Hendarmawan, Hendarmawan
Format: Article
Language:English
Subjects:
Carbon isotope
Fault
Permeability
Radon
Soil CO2
Wayang windu
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Summary:•Series of soil gasses measurements (222Rn, CO2 and δ13C) had been performed in Wayang Windu geothermal field, Indonesisa to infer permeability of fault structures.•High and anomaly of soil gasses concentration (222Rn and CO2) were correlated with several segments of fault structures.•The δ13C values showed mixtures of soil CO2 origin, i.e., atmospheric, biogenic and magmatic components.•Transport of 222Rn to surface does not depend on CO2 as gas carrier. As a geogenic gas, 222Rn (radon) has been widely utilized to infer permeability zones in some geological settings such as fault zones, volcanic and geothermal areas. In this study, soil 222Rn was measured in Wayang Windu geothermal area to infer the relation between fault and permeability. In addition, measurement of soil CO2 and its δ13C composition were also performed to infer transport mechanism and the origin of soil CO2. The high and anomaly soil 222Rn, i.e., above 8,500 Bq/m3, were found in the south - southwest area and related to Pejaten Fault, Banjarsari Fault and Cibitung Fault. In contrast, low soil 222Rn was found in the northern area, where several highly productive geothermal wells are located. The high and anomaly soil CO2 concentrations were also found in a relatively similar area with high 222Rn, but not closely related to the fault structures. Furthermore, the δ13C composition showed that the origin of soil CO2 in the area was magmatic, biogenic and atmospheric. Based on the 222Rn/CO2 values and its δ13C compositions, the mechanism of 222Rn transport was interpreted as independent from CO2 as carrier gas.
ISSN:0375-6505
1879-3576
DOI:10.1016/j.geothermics.2023.102691