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Lithological Discrimination Based on Radiometric Data: Case Study of Rabau Sector, West Kalimantan and Salumati Sector, West Sulawesi Maulana, Muhammad Wira; Ciputra, Roni Cahya; Iskandarsyah, Iskandarsyah; Adimedha, Tyto Baskara; Sukadana, I Gde; Indrastomo, Frederikus Dian; Syaeful, Heri; Pratiwi, Fadiah; Rachael, Yoshi; Mardania, Faneza Nur; Kamajati, Dhatu; Rahmawati, Putri; Garwan, Mirna Berliana
EKSPLORIUM Vol. 46 No. 1 (2025): MAY 2025
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2025.11475

Abstract

This study evaluates the applicability of radiometric methods for lithological discrimination in tropical environments, with a focus on two uranium exploration sites in Indonesia: the Rabau Sector in West Kalimantan and the Salumati Sector in West Sulawesi. These locations were selected to represent various lithologies within the uranium exploration program. The aim is to determine whether gamma-ray spectrometry, commonly effective in arid environments, can also delineate lithological boundaries and alteration zones under conditions of intense weathering and dense vegetation cover of tropical area. Ground-based radiometric data were collected using the RS-125 gamma spectrometer to record the concentration of potassium (K), equivalent uranium (eU), and equivalent thorium (eTh). Data processing involved anisotropy analysis, geostatistical interpolation using ordinary kriging, ternary RGB composite mapping, and delineation of radiometric domains. The resulting radiometric maps were then qualitatively compared with existing geological maps for validation. The results show that radiometric signatures, particularly eTh and eU, can effectively distinguish rock units with differing genesis or degrees of alteration, despite tropical conditions. In Rabau, where lithologies share a common protolith, elevated eU concentrations correspond to hornfels, while metatuff and metasiltstone remain indistinguishable, indicating the influence of thermal metamorphism on radiometric responses. In Salumati, eTh and eU zoning within phonolite suggest compositional variability or differential alteration, and elevated eU in altered tuff reflects uranium remobilization in smectite-rich zones. These findings demonstrate that, despite the challenges posed by tropical climates, radiometric mapping remains a viable tool for lithological discrimination and early-stage uranium exploration in Indonesia. This work extends the application of radiometric techniques beyond arid environments and underscores the need to integrate radiometric interpretation with genetic, provenance, and alteration context in tropical geological mapping.
Co-Authors . Iskandarsyah Adi Gunawan Muhammad Adimedha, Tyto Baskara Agung Harijoko Agus Handoyo Harsolumakso, Agus Handoyo Aminarthi, Erwina Andriansyah, Rian Argianto, Ekky Novia Stasia Arifudin Idrus Asep Saepuloh Asmoro Widagdo, Asmoro Bambang Priadi Ciputra, Roni Cahya Dhatu Kamajati, Dhatu Dian Milvita Draniswari, Windi Anarta Draniswari, Windi Anartha Effendi, Erawan Esti Handini Farenzo, Rayhan Aldizan Fauzi, Rachman Frederikus Dian Indrastomo, Frederikus Dian Heri Syaeful Himawan Tri Bayu Murti Petrus Kusuma, Sekar Indah Tri Lucas Donny Setijadji Luky Adrianto Mardania, Faneza Nur Maulana, Muhammad Wira Mirna Berliana Garwan, Mirna Berliana Muharif, Damas Mu’awanah, Frida Rosidatul Ngadenin Ngadenin Ngadenin Nugraheni, Rosmalia Dita Nunik Madyaningarum, Nunik Okki Verdiansyah Pratiwi, Fadiah Putra, Aldo Febriansyah Putri Rahmawati Rachael, Yoshi Ramadhani, Syarifah Regiska, Nadia Rosianna, Ilsa Sartapa Sartapa, Sartapa Suharji Sukmawan, I Gusti Made Sunarko Sunarko Supit, Jance Mudjani Supraba, Vertika Dhianda Suripto Suripto Widodo Widodo Widodo