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All Journal Geosfera: Jurnal Penelitian Geografi Jurnal Riset dan Pengabdian Interdisipliner
Ronal Hutagalung
Program Studi Teknik Geologi, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Gorontalo
Humanities Earth & Planetary Sciences Education Environmental Science Social Sciences Other

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Integrasi Risiko Geologi Dalam Instrumen Tata Ruang: Analisis Isi Regulasi RTRW Kabupaten Pohuwato 2025-2045 Dicky Rahmansyah S. Tone; Wahyulin Ws. Harunja; Siti Qamariyah Bunga; Aprilia Mohune; Sri Maryati; Ronal Hutagalung
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Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jrpi.v3i3.39335

Abstract

Fifteen relevant articles/paragraphs were identified and evaluated across three analytical dimensions: the existence of geological hazards within spatial patterns, the depth of zoning control instruments, and potential spatial conflicts between settlement allocations and hazard-prone zones. The strongest control instruments are the seismic KRB provisions incorporating PGA and MMI parameters (Article 96(10)) and the mandatory tsunami risk assessment requirement (Article 96(16)). Five structural weaknesses were identified: absence of coordinate-based non-buildable zones, lack of Gorontalo Fault data integration, absence of liquefaction hazard provisions, no climate change projections, and lack of an operational RDTR. Significant spatial conflicts were identified in coastal urban settlements overlapping with high-level tsunami and flash flood hazard zones. Detailed geological mapping at 1:25,000 scale, geohazard-based RDTR, and mandatory site-specific hazard assessment procedures are required prior to building permit issuance in high KRB zones.
Studi Tipe Endapan Nikel Laterit Pada Kecamatan Bahodopi, Kabupaten Morowali, Sulawesi Tengah Anisa Sawitri B. Bania; Aang Panji Permana; Ronal Hutagalung
Geosfera: Jurnal Penelitian Geografi Vol 5, No 1 (2026): Geosfera : Jurnal Penelitian Geografi
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/geojpg.v5i1.39070

Abstract

Nickel laterite deposits represent the primary source of nickel formed through intensive weathering of ultramafic rocks in tropical regions. Deposit characterization is essential for understanding nickel enrichment mechanisms and supporting more effective exploration strategies. This study aims to characterize and classify the nickel laterite deposit type within the IUP area of PT Bumi Kalaena Persada, Bahodopi District, Morowali Regency, Central Sulawesi, Indonesia. The research employed geomorphological analysis, surface geological observations, drilling data interpretation, geochemical analysis using X-Ray Fluorescence (XRF), and petrographic examination. Deposit classification was based on Ni grade distribution, mineralogical characteristics, groundwater table position, and nickel accumulation mechanisms. The results indicate that the laterite profile developed over serpentinized lherzolite belonging to the Ultramafic Complex. Nickel enrichment is predominantly concentrated within the saprolite zone, with grades ranging from 1.24% to 2.38%, accompanied by increasing MgO and SiO₂ contents and decreasing Fe concentrations. Mineralogical analysis identified hydrous Mg–Ni silicate minerals, including garnierite, talc, and serpentine, as the principal nickel-bearing phases. The groundwater table is interpreted to occur within the limonite–saprolite transition zone, where it plays a significant role in controlling nickel mobility, precipitation, and accumulation. The integration of geochemical, mineralogical, hydrogeological, and nickel accumulation characteristics indicates that the deposit is classified as a hydrous silicate type, with the saprolite zone representing the principal horizon of nickel enrichment.
Co-Authors Anisa Sawitri B. Bania Aprilia Mohune Dicky Rahmansyah S. Tone Permana, Aang Panji Siti Qamariyah Bunga Sri Maryati Wahyulin Ws. Harunja