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All Journal Media Penelitian dan Pengembangan Kesehatan Pharmaciana: Jurnal Kefarmasian Jurnal Studi Sosial Program Pascasarjana P-IPS JGE (Jurnal Geofisika Eksplorasi) Jurnal Terapan Abdimas Jurnal Ilmiah Mahasiswa Ekonomi Manajemen Al Qalam: Jurnal Ilmiah Keagamaan dan Kemasyarakatan JFIOnline Jurnal Ilmu Kefarmasian Indonesia Jurnal Sains dan Teknologi Reaksi Edu Masda Journal PESAGI (Jurnal Pendidikan dan Penelitian Sejarah) Industrial Research Workshop and National Seminar Pharmaceutical Sciences and Research (PSR) Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
. Iskandarsyah
Departemen Farmasi Universitas Indonesia
Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Public Health Social Sciences Other

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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 . Jenny . Juheini . Sutrio . Sutriyo Adib Ihsan Panggabean Adimedha, Tyto Baskara Ahmad Aulia Alip Mutakim Alip Mutakim, Alip Amirul Azhar Animar J A Animar J.A. BZ, Fazli Syam Ciputra, Roni Cahya Cut Afrianandra, Cut Devi Octarina Devi Octarina Devi Octarina, Devi Dhatu Kamajati, Dhatu Dian Hayati Dian Hayati Dwi Kurnia Putri Effionora Anwar Effionora Anwar Emma Sri Kuncari Erny Sagita Erny Sagita, Erny Esadini, Ayu Rana Evayani, Evayani Frederikus Dian Indrastomo, Frederikus Dian Gabriella Pasaribu Gabriella Pasaribu, Gabriella Harmita Harmita, Harmita Hasan Yudie Sastra Heri Syaeful I Gde Sukadana Ilmi Zajuli Ichsan Imam Prabowo Imam Prabowo, Imam J.A, Animar Jenny Jenny Jenny, Jenny JOSHITA DJAJADISASTRA Juheini Amin Juheini, Juheini Junaedi, . Lestari, Novi Mardania, Faneza Nur Maulana, Muhammad Wira Mirna Berliana Garwan, Mirna Berliana Mudinillah, Adam Munira Oviyatama Nurleni, Novi Praditya Ardi Putranto Praptiwi Praptiwi Pratiwi, Fadiah Putri Rahmawati R Gunawan Sudarmanto Rachael, Yoshi Rahmawati, Rahmawati RINI SUGIYATI Rosmala Dewi Rosmala Dewi Sribudi Karyadi Suparman Arif Sutriyo Sutriyo, Sutriyo Untia Kartika Sari Ramadhani William Jhanesta