2 / 2019-09-03 07:31:59

LAND SURFACE TEMPERATURE AND GEOTHERMAL HYDROCHEMICALS OF MOUNT TANGKUBAN PARAHU, WEST JAVA, INDONESIA

Geothermal, Tangkuban Parahu, Land Surface Temperature, Geothermometer.

The research area is located on the southern and eastern side of Tangkuban Parahu Mountain, West Java. This research aims to know the geothermal characteristic of research area by using satellite imagery analysis and geothermal hydrochemical approaches. The land surface temperature method used to know the temperature of the soil surface around the manifestation and its distribution. The hydrochemical method is used to determine the type of hot spring water, maturity level, and to estimate the temperature of the underground reservoir using the geothermometer of water at hot springs found in the study area. The land surface temperature analysis shows that there is no tendency between hot water temperatures with land surface temperature analysis on the research area. Only Domas hot spring, which shows relative relation of water temperature and land surface temperature which said hot spring has the highest value on both parameters. The results of the hydrochemical method shows that the entire sample is divided into three types of water: bicarbonate water for MBY-01 and CRG-01; water sulfate-chloride for KNC-01, CTR-01, and CTR-02; and water sulfate for DMS-01, all water is included into the immature water and indicates that all of surface geothermal manifestations are strongly influenced by meteoric water and does not represent reservoir water from below. The temperature of the DMS-01 water sample calculation, which has sulfate water type, is selected to be the most plausible temperature value in the calculation of subsurface temperature, with a temperature range of 81-97 ºC. The calculation result has a low-temperature range indicating that the geothermometer calculation is likely to not reflect the temperature of the reservoir. From the above analysis result, there is a tendency of the declining value of springs temperature and land surface temperature around geothermal manifestation with water type from the result of laboratory analysis.