Temperature f Gold Mineralization In Tugurejo Area and Its Surrounding, Slahung Subdistrict, Ponorogo District, East Java Province, Indonesia
Keywords:
sulfidation, alteration, mineralization, quartz, fluid inclusionAbstract
Our research was conducted in Tugurejo Area and its surrounding, Slahung District, Ponorogo Regency, East Java, Indonesia. It consists of 2 informal lithostratigraphic units, that are the Watupatok Formation lava unit and the Watupatok Formation breccia unit. Tugurejo area and its surrounding is an area of alteration and mineralization, such as gold, copper and zinc (Purwanto, et al., 2021). The geological structures of the research site are predominantly joints filled with quartz veins and faults in the direction of NE-SW, NW-SE and E-W. The hydrothermal alterations formed in the research site were grouped into three alteration types, which are silica type (defined by Pyrite ± Quartz), argillic type (defined by Smectite ± Kaolinite ± Quartz ± Pyrite ± Albite), and propylitic (identified by Chlorite ± Albite ± Quartz ± Dolomite ± Pyrite ± Smectite ± Illite minerals). The mineralizations encountered at the research site are Pyrite (FeS2), Chalcopyrite (CuFeS2), Sphalerite (ZnS). Previous research showed that the area and its vicinity has Epithermal Low Sulfidation deposit type and Intermediate Sulfidation which generally could be identified in the quartz veins (Purwanto, et al,2021). This research is a continuation of the previous one in order to know the temperature of mineralization and alteration zone, as well as lithology and geological structure in research area. The general method of this research is surface mapping, and the temperature data was obtain by fluid inclusion analysis of the quartz vein samples acquired in the area. There are 2 samples of quartz to be analyzed and interpreted to represent the temperature of mineralization in the area. Based on the analysis result, we conclude that the temperature of mineralization in the research area is between 263°C - 312°C with salinity 5.13 – 6.13 wt% NaCl and 273 – 300OC, with salinity 3,16 - 4,24 %WT
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