Abstract
In Mabini geothermal field, low-sulphidation style of mineralization is encountered at approximately epithermal level to surficial environment as manifested by the presence of alteration halos, open space-filling gypsum deposits and warm grounds. The most impressive thermal manifestations are the altered grounds found in the pre Plio-Pleistocene andesite-basaltic sequence located in Mainit area, South of Mabini. Such altered grounds occur in patches and are partially covered by recent tuff layers. Their mode of formation can be ascribed to the NW and NE trending fault structures that provide permeability for circulating hydrothermal fluid. The observed assemblages of clay minerals in major halos are induced by two fronts of alteration, i.e., argillization and sericitization. They are found to associate intimately with gypsum vein mineralization. Their distribution exhibits a characteristic zonality whose succession in the direction away from the gypsum lode is: kaolinite-illite zone, flanked by an illite-mixed layer illite/smectite (I/S)-smectite zone and a chlorite-mixed layer chlorite/smectite(C/S)-smectite assemblage further away.
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