Informasi Detil Paper

Judul: Characteristics Interpretation of Alteration Minerals of Waiyari Geothermal Manifestation Area, Central Maluku
Penulis: Helda Andayany  || email:
Jurnal: Prosiding FMIPA 2015 Vol. 1 no. 1 - hal. 86-89 Tahun 2015  [ MIPA ]
Keywords:  XRD, petrography, sandstone tuff, alteration minerals.
Abstract: Petrographic analysis to rock samples located at Waiyari geothermal was dominated by feldspathic greywacke. Another alteration mineral types of the rocks in this area are quartz, opaque, lithic, and feldspar minerals. The interpretation of alteration minerals show that the mineral types of the origin rock is sandstone tuff. Petrographic analysis is supported by the XRD method that indicates that the alteration minerals present are generally dominated by the presence of clays such as illite-chlorite with particle size of < 0,03 mm, the abundance of 55% and the spread evenly. Alteration minerals which is generally dominated by illite-chlorite clays show that reservoir temperature of Waiyari geothermal area is 175oC and pH of fluid is neutral. In addition, illite deposited directly with the temperature between (190-220)°C is closely related to the rock more permeable. This gives the sense that the illite zone associated with the peak zone which is permeable reservoir where the fluid flow convection, so that the temperature in this zone is relatively homogeneous. Precipitate of silica can also be used as a good indicator for the presence with the reservoir temperature of >175oC. Our result show that Waiyari geothermal area is mainly from water heated reservoir that contains silica and is located on the outflow area through fractures.
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