ICWES15 - Structure, Hydrogeology and the Geothermal System of Mount Ungaran Area, Central Java, Indonesia. Presented by Prof Dr Sari B Kusumayudha, University of Pembangunan Nasional (UPN), Indonesia
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The document summarizes the geology, hydrogeology, and geothermal system of Mount Ungaran in Central Java, Indonesia. The area contains three main faults: the Ungaran reverse fault, Getas left strike slip fault, and Jimbaran normal fault. The hydrogeologic system consists of a complex fissured aquifer. Groundwater flows through this system and interacts with magmatic bodies, enabling a geothermal system expressed as fumaroles on the flanks and fractures. Fumaroles in the area emit water vapor, CO2, H2S, H2, and CH4 at 85°C and a pH below 4.0.
ICWES15 - Structure, Hydrogeology and the Geothermal System of Mount Ungaran Area, Central Java, Indonesia. Presented by Prof Dr Sari B Kusumayudha, University of Pembangunan Nasional (UPN), Indonesia
- 1. STRUCTURE, HYDROGEOLOGY, AND THE GEOTHERMAL SYSTEM OF MOUNT UNGARAN AREA, CENTRAL JAVA, INDONESIA Sari B ahagiarti Kusumayudha UPN “Veteran” Yogyakarta , Indonesia
- 2. Location of the Study Area
- 3. Physiographic Map of the Central Java
- 4. Geologic Map of the Study Area
- 5. Table 1. Field supporting data to fault classification of the study area Fault Name Classification Field Supporting Data Getas Fault Left strike slip fault Scarps along the Santritulung river Fault breccias at river Santritulung, Begajah, and river Klampok Lithologic offset, and shear & gash fractures Jimbaran Fault Normal fault Fault plane with slicken sides Fault breccias, shear and gash fractures Lithologic offset Ungaran Fault Reverse fault Fault plane with slicken sides Scarps, water fall, and fault springs Brecciated zones, Lithologic offset, Minor faults, and drag folds
- 6. Volcano-tectonic of Mount Ungaran
- 7. a. Lava dome b. Fumarole a b
- 8. Hydrogeologic System of Mount Ungaran
- 9. Table 2. Properties of the Ungaran aquifers Hydraulic Conductivity (m/sec) Transmissivity (m2/sec) Effective Porosity Storage Coefficient 0.9 . 10 -5 to 1.9.10 -5 1.3.10 -4 to 3.3.10 -2 10% – 25%, 1.10 -3 to 1.7.10 -1
- 10. Table 3. Groundwater chemistry of the Ungaran aquifers Sample ID Location (Village) Hydrochemistry Concentration (Mg/l) Water Type Ca Mg Na HCO3 SO4 Cl U1a Jimbaran 1 56.12 14.59 27.59 256.25 19.21 14.18 Ca-Mg-Na-HCO3 U1b Jimbaran 2 56.14 14.58 27.58 256.25 19.20 14.19 Ca-Mg-Na-HCO3 U2a Karangjoho1 24.05 14.60 62.07 189.14 9.61 56.72 Na-Mg-Ca-HCO3-Cl U2b Karangjoho 2 26.05 13.38 48.28 192.19 9.61 35.45 Na-Ca-Mg-HCO3-Cl U3 Pakopen 24.05 19.45 50.57 231.84 19.22 24.81 Na-Mg-Ca-HCO3 U4 Kalikembar 36.07 17.02 34.48 247.11 4.80 14.18 Ca-Na-Mg-HCO3 U5 Sruwen 76.15 13.37 29.89 317.26 19.20 10.64 Ca-Na-HCO3 U6 Coblong 26.05 13.38 20.69 167.78 9.60 7.09 Ca-Mg-Na-HCO3 U7a Diwak 1 28.06 13.37 29.88 184.26 9.61 17.72 Ca-Na-Mg-Cl U7b Diwak 2 36.07 17.02 41.38 222.69 9.60 35.46 Ca-Na-Mg-HCO3-Cl
- 11. Piper Diagram of the groundwater chemistry
- 12. Geothermal system model ( http://www.indotoplist.com/info )
- 13. Fumarole Characteristics of Mount Ungaran water vapor gases: CO 2 , H 2 S, H 2 , and CH 4 temperature of about 85 o C ph < 4.0 (very low acidity)
- 14. Conclusion Geology of the study area is composed of Tertiary Penyatan Formation, and Pliopleistocene Notopuro Formation. Penyatan Formation consists of sandstone, breccias, and marl, Notopuro formation consists of andesitic to basaltic breccias, lavas, volcanic sandstones, and tuffs. The formations are intruded by andesites and basalts. Geologic structures in the study area are folds and faults. The three main faults are Ungaran reverse fault, Getas left strike slip fault, and Jimbaran normal fault.
- 15. Conclusion The hydrogeologic system of the Ungaran southeastern slope is built of a complex fissures aquifer system. The groundwater types are Ca-Mg-Na-HCO3, Na-Ca-Mg-HCO3-Cl, Ca-Na-HCO3, and Ca-Na-Mg-Cl. The geologic structur and hydrogeologic system let groundwater of the surrounding area to contact with magmatic and plutonic bodies to perform geothermal system The geothermal system of the study area is expressed as flank and fissure fumaroles eruption. The fumaroles consist of water vapor, CO 2 , H 2 S, H 2 , and CH 4 with 85 o C temperature, and pH<4.0
- 16. Thank You For Your Attention