This suggests that either these structure are deep-seated or the magma body is shallow enough for the gases to as- cend freely and escape naturally through the soil. Rn) emanating from these structures were measured to be anomalously higher than the background ( Kanda, 2010 ). These struct ures act as condu its of magm a to shallow levels, supplyi ng the much-need ed heat to the geot herma l re- servoir. These faults are interpreted as the feeder dikes of the dense syenitic intrusives, that are hosted within the trachytic formation, and believed to be the heat source for the geothermal system. The structural system controlling the extent of the dense trachytic body of Olrongai is distinct, but for the caldera, some inference can be made from the results of this study. The mode l showe d a close relatio nship between faults and infer red geom etry of subsu rface volcanic complexe s displayed as discrete dike-like bodies in the near-surface environment. Lineament structures were extracted from satellite images and used to enrich the geological structures. The resultant model was then interpreted together with surface manifestations, geology, and geological structures. The model was constrained using estimated densities of drill hole cutting recovered from the geothermal wells.
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