IDENTIFICATION OF ALTERATION DISTRIBUTION RELATED RADIOACTIVE MINERALIZATION USING REMOTE SENSING METHODS IN MAMUJU, WEST SULAWESI

• Main Author: La Ode Prianata, Yogi
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/54434
• Institution: Institut Teknologi Bandung

Mamuju area shows a natural radioactive value of 2,800 nSv/h derived from volcanic rock. This causes Mamuju to be the most potential area for the availability of radioactive minerals. Utilization of radioactive as a source of energy is needed in life. Radioactive exploration activities in Mamuju actively to carried out including remote sensing methods. The aim of this study was to investigate the spectral form, the main mineral, and the distribution of altered mineral related radioactive mineralization in the Mamuju region. Spectral reflectance measurements show that the main absorption occurs at VNIR and SWIR wavelengths which are characterized by the presence of clay minerals, Al-OH, and Fe-OH minerals. Qualitative mineral interpretation using SpecminPro and confirmed by laboratory analysis. The spectral form was characterized by SWIR wavelengths (1400–1550 nm, 1900–2000 nm, and 2100–2200 nm) which may indicate the relation with altered minerals. Moreover, the absorption at each wavelength was analysed and a positive result correlation was found at 2200 nm. The distribution of alteration minerals using the method of principal component analysis (PCA) and directed principal component analysis (DPCA). Alteration minerals were identified as kaolinite, chlorite, biotite, illite, and quartz which are mapped using the PCA by the bands B2, B8, B11, and B12. The DPCA method using band ratio 3/4 and 12/2 for minerals quartz, bands 8/4 and 11/12 for kaolinite minerals, and bands 8/3 and 11/2 for chlorite minerals.