TY - JOUR
T1 - Distribution of 222Rn and CO2 across faults and its origin in Wayang Windu geothermal area, West Java - Indonesia
AU - Prasetio, Rasi
AU - Hutabarat, Johanes
AU - Daud, Yunus
AU - Hendarmawan, Hendarmawan
N1 - Funding Information:
The authors would like to express gratitude to our colleagues in Research and Technology Center for Application of Isotope and Radiation who provided assistance during field and laboratory works. This study was funded by Indonesian government funding through Research and Technology Center for Application of Isotope and Radiation .
Publisher Copyright:
© 2023
PY - 2023/5
Y1 - 2023/5
N2 - 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.
AB - 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.
KW - Carbon isotope
KW - Fault
KW - Permeability
KW - Radon
KW - Soil CO
KW - Wayang windu
UR - http://www.scopus.com/inward/record.url?scp=85149444433&partnerID=8YFLogxK
U2 - 10.1016/j.geothermics.2023.102691
DO - 10.1016/j.geothermics.2023.102691
M3 - Article
AN - SCOPUS:85149444433
SN - 0375-6505
VL - 110
JO - Geothermics
JF - Geothermics
M1 - 102691
ER -
