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Analysis of Limestone Characteristics on the South Coast of Gorontalo Based on Specific Gravity and Water Absorption Tests Aang Panji Permana; Ronal Hutagalung; Sunarty Suly Eraku; Dewi Rahmawaty Isa
Jurnal Penelitian Pendidikan IPA Vol 10 No 11 (2024): November
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i11.7368

Abstract

The southern coast of Gorontalo has complex geological conditions. This is indicated by the strong tectonic influence with the uplift of the Quaternary limestone at high elevations. The distribution of this limestone is very unique because it is located between the dominance of volcanic and plutonic rocks that form the northern arm of Sulawesi. The purpose of this study was to focus on the characteristics of limestone on the south coast of Gorontalo based on specific gravity and water absorption tests. The research methods used to achieve these objectives consist of field geological surveys and laboratory analysis of the specific gravity and water absorption tests of coarse aggregate. The field geological survey consisted of taking limestone samples for laboratory analysis and petrological analysis. The results showed that the limestone on the southern coast of Gorontalo is dominated by the coralline floatstone facies. Characteristics of the coralline floatstone facies based on laboratory analysis showed an average specific gravity of 1.74 and an apparent specific gravity of 2.04. While the average percentage of limestone water absorption is 8.41%.
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.
Telaah Substansi Mitigasi Bencana Geologi dalam RTRW Kota Gorontalo Tahun 2019–2039 Amalia Putri Paputungan; Tanzilal Pena; Suci Rahmawati Mustapa; Candrawati Pulogu; Mohamad Saputra Hamzah; 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.v3i3.39509

Abstract

Gorontalo City is an urban area vulnerable to geological and hydrometeorological hazards, including earthquakes, landslides, floods, coastal abrasion, and tsunamis. Spatial planning is an important instrument for disaster risk reduction through the regulation of disaster-prone areas, protected areas, and spatial utilization control. This study aims to examine the substance of geological disaster mitigation in Gorontalo City Regional Regulation Number 9 of 2019 concerning the 2019–2039 Spatial Plan. This research employed a qualitative approach using content analysis of the spatial planning document, particularly sections related to disaster-prone areas, active fault buffer zones, earthquake-prone areas, and zoning provisions. The findings show that the Gorontalo City Spatial Plan has accommodated disaster mitigation through the designation of disaster-prone areas, protection of conservation areas, control of cultivation activities, and provision of evacuation routes and spaces. However, these provisions still require more detailed technical elaboration, particularly regarding the spatial boundaries of active fault buffer zones, safe distances from fault lines, hazard classification, and technical requirements for development in disaster-prone areas. Therefore, strengthening detailed spatial plans, zoning regulations, integration of disaster hazard maps, and supervision of spatial utilization is essential to support safer and more sustainable urban development in Gorontalo City.Keywords: disaster mitigation, Spatial Plans (RTRW). The Gorontalo region's geological conditions are influenced by tectonic activity and the presence, active faults, earthquakes, spatial planning.
Telaah Muatan Mitigasi Bencana Geologi dalam Peraturan Daerah RTRW Kabupaten Boalemo Tahun 2025–2045 Cinta Mutia Panto; Rikarni Taruk Tiku; Moh Rifay Ahmad; Anastasya Putri Bengga; 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.v3i3.39491

Abstract

This study examines the zoning and spatial use directives for geological hazard-prone areas in the Regional Spatial Plan of Boalemo Regency for 2025–2045. The study is important because spatial planning documents should function not only as development guidance but also as an instrument for geological disaster mitigation. This research used a qualitative descriptive approach with content analysis of the Boalemo Regency Spatial Planning Regulation document and supporting scientific literature. The analysis focused on three aspects: the existence of geological hazards in the spatial plan, the regulatory depth of zoning and special provisions, and the relationship between settlement allocation and potential geological vulnerability. The results show that geological disaster mitigation has been accommodated in a general way through protected areas, disaster evacuation systems, and disaster risk programs. However, the regulation has not yet explicitly classified geological hazard zones or firmly regulated non-buildable areas. This indicates that the regional spatial plan still requires stronger integration of geohazard mitigation to support safe long-term regional development. 
Kontrol Struktur Geologi Terhadap Pola Mineralisasi Di Desa Hulawa, Pohuwato, Provinsi Gorontalo Diwa Ahmad Luly; Aang Panji Permana; Noviar Akase; Muhammad Kasim; Ronal Hutagalung; Agustinus Sosang
Journal of Applied Geoscience and Engineering Vol 5, No 1 : Juni 2026
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jage.v5i1.38955

Abstract

This study was conducted in Hulawa Village, Buntulia District, Pohuwato Regency, Gorontalo Province, located within the North Arm of Sulawesi, an area known for its epithermal mineralization potential. The research aims to analyze the relationship between geological structures and mineralization patterns. The methodology involved geological surface mapping, structural measurements, lineament analysis, and stereographic interpretation using Dips 7.0 and WinTensor software. Geomorphologically, the study area consists of fault-controlled mountainous and hilly terrains. The identified lithologies include Lapilli Tuff, Porphyritic Rhyodacite, Rhyodacite Breccia, Dacite, Biotite Dacite, and Diorite. Structural analysis indicates that the area was affected by a principal compressional stress (σ1) trending Northwest–Southeast (NW–SE), which generated conjugate fracture systems oriented NW–SE and Northeast–Southwest (NE–SW). These structures acted as conduits for hydrothermal fluid migration. Two dominant vein orientations were identified: NE–SW trending oxidized quartz veins in the northeastern area and NW–SE trending sulfide-rich stockwork veins containing pyrite and chalcopyrite in the southwestern area. Geochemical analysis shows that Cu, As, and Mo anomalies are spatially associated with structural zones, indicating strong structural control on hydrothermal fluid circulation and mineral deposition. Overall, mineralization in the Hulawa area is interpreted to be controlled by conjugate fracture systems and strike-slip fault structures
Potensi Geodiversity pada Geosite Air Terjun Taludaa, Bone Bolango, Gorontalo Mohamad Ilham D. Djou; Yayu Indriati Arifin; Ronal Hutagalung
Journal of Applied Geoscience and Engineering Vol 5, No 1 : Juni 2026
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jage.v5i1.38923

Abstract

This study was conducted in Taludaa Village with the objective of analyzing geological conditions, including geomorphology, lithology, and geological structures, as well as assessing the geodiversity potential of the waterfall geosites using Brilha’s (2015) classification. The methodology involved surface geological surveys, laboratory analysis, and studio processing. Results show that the geomorphology of the study area comprises two units: structural hills and an alluvial plain. The stratigraphy consists of andesite, granodiorite, and alluvial deposits. Geological structures identified include tension joints caused by compression stress and an oblique fault trending southeast–northwest. At Station ID43, a normal right-slip fault with a dip angle of less than 45° was observed. The geological history indicates tectonic activity from the Early to Middle Miocene, forming andesitic volcanic rocks of the Bilungala Formation, followed by Middle to Late Miocene granodiorite intrusion, and Holocene alluvial deposition continuing to the present. The geodiversity inventory identified two waterfall sites (Geosite 1 and Geosite 2). Both geosites demonstrate high scientific and educational value, moderate tourism value with a total score of 245, and very low vulnerability with a total score of 100. These findings highlight the significant scientific and educational potential of the Taludaa waterfalls, supporting their role in geoconservation and sustainable geotourism development in Gorontalo.
Analisis Kestabilan Lereng Pada Relokasi Jalan di Bendungan Bulango Ulu, Kabupaten Bone Bolango, Provinsi Gorontalo Alya Rahmawati Panai; Muh Kasim; Ronal Hutagalung; Alifia Widya Warapsari Badaru
Journal of Applied Geoscience and Engineering Vol 5, No 1 : Juni 2026
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jage.v5i1.38921

Abstract

This study aims to evaluate slope stability along the relocated road section of Bulango Ulu Dam, Bone Bolango Regency, Gorontalo Province. The research focuses on geological conditions, rock mass quality, and slope stability using Rock Mass Rating (RMR) and Slope Mass Rating (SMR) methods based on scanline mapping data. Field investigations were conducted on four slope segments (AP1–AP4) by measuring discontinuity characteristics, rock strength, spacing, and groundwater conditions.The results indicate that the rock mass quality of all slope segments falls into Class I–II of the RMR system, categorized as very good to good rock, with RMR values ranging from 70 to 83. SMR analysis shows that all slope segments belong to Class II, indicating stable slope conditions. Kinematic analysis reveals that the dominant potential failure mechanism is toppling failure, with probability of failure values ranging from 10.00% to 23.97%.Although the slopes are classified as stable, the presence of geological structures, particularly discontinuities, contributes to potential instability under certain conditions. Continuous monitoring is therefore recommended to mitigate future landslide risks. The findings provide important insights for slope stability evaluation and infrastructure safety planning in mountainous regions.
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.
Geologi Regional Daerah Tamboo, Kecamatan Bonepantai, Kabupaten Bone Bolango, Provinsi Gorontalo Jingga Hamdata; Ahmad Zainuri; Ronal Hutagalung
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Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jrpi.v3i3.40389

Abstract

This research was conducted in Tamboo Village, Bonepantai District, Bone Bolango Regency, Gorontalo Province, with the aim of identifying the geological conditions of the study area, including its geomorphology, geological structures, and stratigraphy. The research employed geological field mapping supported by laboratory analyses to obtain comprehensive geological data. The results indicate that the geomorphology of the study area is divided into two geomorphic units, namely the denudational hill unit and the marine coastal plain unit.The denudational hill unit is the dominant landform, covering approximately 70% of the study area. This unit extends in a northwest–southeast direction and is characterized by relatively closely spaced contour patterns and gently rounded slopes formed by denudational processes. In contrast, the marine coastal plain unit occupies approximately 30% of the study area, with elevations ranging from 0 to 50 meters above sea level. This unit developed within a transitional environment between the land and the sea and exhibits the same northwest–southeast distribution.The geological structures identified in the study area are classified as secondary geological structures, represented by the presence of shear fractures and tension fractures. Based on geological age, the stratigraphy of the study area consists of two lithological units, namely Holocene (Quaternary) limestone as the youngest unit and Miocene (Tertiary) andesite as the oldest unit. Overall, the geological conditions of the study area demonstrate a close relationship among lithology, geomorphology, and geological structures, which collectively control the formation and evolution of the landscape.
Identifikasi Sebaran Kadar Ni Menggunakan Metode Hand Auger Desa Molino, Kabupaten Morowali Utara, Sulawesi Tengah Moh Al-Fayedh; Muh Kasim; Ronal Hutagalung; Alifia Widya Warapsari Badaru
Journal of Applied Geoscience and Engineering Vol 4, No 2 : Desember 2025
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jage.v4i2.33756

Abstract

One of the regions in Indonesia with potential laterite nickel deposits is North Morowali, where the MTosu Formation, composed of Cretaceous-aged ultramafic rocks, is found. This study aims to identify the distribution of laterite and nickel content using data from Hand Auger analysis. The methods used include field observations, Hand Auger sampling, and geochemical analysis through X-Ray Fluorescence (XRF). The research area features two main geomorphological units: structural steep hills and structural gentle hills. Its stratigraphy consists of lherzolite and serpentinite units. The dominant geological structure trends northeast-southwest, following a linear pattern. Laterite distribution in the area is controlled by topography. Nickel content is categorized into three zones: high, medium, and low. XRF analysis of Hand Auger samples indicates that high nickel concentrations are located in the southwest and extend northeast across the study area.