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| | 講演要旨(英文) | | Northern Thailand is the mountain and range province according to the past subduction of the consecutive terranes and holds many moderately high temperature (T > 80degC). A pilot magnetotelluric (MT) survey was proposed to characterize hydrothermal system of Maechan geothermal area located 30 km to the north of Chiangrai province. 7 MT stations were deployed covering the area of 10 km2 over Maechan geothermal field. The off-diagonal elements of the impedance tensor ranging from 0.003 to 300 s were used to obtained 3-D resistivity model using WSINV3DMT inversion program. The inverted model indicates two conductive anomalies at the depth less than 200 m beneath hot springs manifestation. These conductive zones are then referred as the hot water. The resistivity contrast dipping North-West also shows the correspondence to Maechan strip-slip fault zone. Hot water is believed to be stored in the fractured granite of the fault's damage zones. The heat source of the hydrothermal system is the deeper batholith hot granite which inferred from the huge resistive body covering the area from the depth of 200 m. However, to be more accurate in delineating the hydrothermal system for help designing the small binary geothermal power plant, a more details and wider MT surveys are needed as well as the borehole data. |
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