STUDI ZONA ALTERASI DAERAH X, KECAMATAN LOLAYAN, KABUPATEN BOLAANG MONGONDOW, PROVINSI SULAWESI UTARA BERDASARKAN ANALYTICAL SPECTRAL DEVICES (ASD)

Abstract

Administratively, the study site is located in Motandoi Village, East Pinolosian District, South Bolaang Mongondow Regency, North Sulawesi Province.  The study area is located in the central part of the northern arm of Sulawesi, which is composed by a magmatic arc of Neogene age. The geological conditions are complex enough to produce potential mineral resources that are economical and have the potential to be the seat of mineralization. The purpose of the research is to determine the geological conditions and identify alteration zones in the research area in order to determine the heat source of the hydrothermal system. The study area is composed of dacite tuff, tuff breccia and quartz diorite. The alteration type of the study area is divided into several types, namely sillica vuggy (SV), sillica massive (SM), sillica advanced argilic (SAA), clay advanced argilic (CAA), and argilic (AR). Then correlated with the set of minerals obtained from the analytical spectral device (ASD) results, thus obtained: vuggy quartz - alunite alteration zone, massive quartz - alunite ± dickite ± Kaolinite alteration zone, alunite ± Kaolinite ± phyropylite alteration zone, phyropylite ± dickite ± Kaolinite alteration zone, dickite ± alunite ± phyropylite alteration zone, Kaoliniteite ± white mica alteration zone, montmorillonite ± white mica ± Kaolinite alteration zone. where the heat source of the study area is in the vuggy quartz - alunite alteration zone and the massive quartz - alunite ± dickite ± Kaol alteration zone.

Keywords: ASD, alteration, Motandoi Village, dacite tuff, tuff breccia