| Title | Geothermal Fluids and Surface Manifestation in Gou Area, Flores Island: An Applied of GeoScientific Surveys in Geothermal Area |
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| Authors | Herry Sundoro, S Dwipa, J. Simanjuntak, A. Nasution, Arif Munandar, Setiadarma, Ashari, R. Hasan |
| Year | 2001 |
| Conference | Indonesian Geothermal Association Conference |
| Keywords | Gou area, geothermal fluids, surface manifestations, applied of geoscientific surveys |
| Abstract | The accessbility of geothermal fluids from the bottom to the surface is marked by geothermal surface manifestations, such as: hot springs, steams, gasses and altered rocks. It is important to understand the relationship between fractures or faults and geothermal manifestation on the surface. The general relationship between fractures or faults and geothermal surface manifestation presumably could be identified by geoscientific survey. The geo scientific survey in Gou geothermal area uses 3 combined methods, those are geological, geochemical, and geophysical surveys. General view for Gou area are: stratigraphy is contributed by volcanic and sediment Quaternary rocks, while those rocks is underlain by the Tertiary basement rocks The high contour values of mercury belong to soil air is concentrated around Managara and Watuh Wuti hot springs, which the maximum concentration of Hg is up to 564 ppb. The lateral distribution of low resistivity (< 10 . m) is concentrated also around those hot springs, and it is opened to the north-east area, while the concentrations area of these low resistivity is least 2 Km2 . The vertical distribution of low resistivity is between 350 ñ 700 m beneath the surface and maximum penetrated is only 700 m depth. This phenomena appears, that altered rocks in this area is formed by geothermal fluids. This paper discuses result of geoscientific in Gou area, Flores island, and the tentative model is presented. |