THE APLICATION OF RADON-222 ISOTOPE, CARBON-13 ISOTOPE, AND TRACE ELEMENTS TO IDENTIFY COLD AND HOT SPRING SOURCES IN WAYANG-WINDU AREA

• Main Author: ZULKHOIRI NIM : 22714305, ANWAR
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25705
• Institution: Institut Teknologi Bandung

<p align="justify">Wayang-Windu is one of productive geothermal fields located in Bandung Southern Mountains. There have been many researches conducted on Wayang-Windu hot springs using various hydrogeochemical methods. However, there is no research that discussed source of the hot springs fluid. <br /> <br /> This study aims to analyse the relationship of the fault to the spring hydrogeochemical concentration, source of the cold and the hot springs, and influence of the hot springs to the cold springs. The cold springs are interesting to be examined because, in some locations, the springs are very close to the hot springs. <br /> <br /> There are eight cold springs and ten hot springs found in the Wayang-Windu area. The hydrogeochemical data were taken from insitu measurements consisting of temperature, pH, TDS, salinity, and 222Rn (Radon-222) isotope; and laboratory measurements consisting of major ions, 13C isotope (Carbon-13), and trace elements. The dissolved 222Rn were measured by using RAD7 and RAD H2O, major ions by using Ion Chromatography, 13C by using Isotope Ratio Mass Spectrometry, and trace elements by using Inductively Coupled Plasma Mass Spectrometry. <br /> <br /> The concentration of dissolved 222Rn in the cold springs ranges between 2,790 - 23,203 Bq/m3, whereas in the hot springs is 309 - 5,146 Bq/m3. The dissolved 222Rn concentration in the cold springs indicates a correlation with the fault intersection. The closer to the fault intersection, the higher the concentration of dissolved 222Rn in the cold springs. The dissolved 222Rn concentration in hot springs decreases as the spring temperature increases. <br /> <br /> The results of 13C, trace elements, and TDS (Total Dissolved Solid) analysis show that the cold springs have local groundwater flow systems and are originated from meteoric water, whereas the hot springs have deeper groundwater flow systems and are originated from magmatic fluids. This interpretation is supported by the value of &#948;13C (from CO2) which indicates that the cold springs and the hot springs have different sources of CO2. The CO2 gas in the cold springs is originated from soil-gas, meanwhile the CO2 gas in hot springs is originated from magmatic fluids. <br /> <br /> There are two cold springs i.e. D-KWY and D-KNC which are affected by the fluid originating from P-KWY and P-TBI hot springs. This can be seen by the high bicarbonate and sulfate concentration in both of the cold springs. In addition, the &#948;13C concentration of both of the cold springs show very low values and close to &#948;13C hot spring P-KWY.<p align="justify"> <br />