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OPHIOLITE : Jurnal Geologi Terapan
Published by Universitas Halu Oleo
ISSN : -     EISSN : 27154440     DOI : https://doi.org/10.56099/ophi.
Core Subject : Science, Engineering,
Earth & Planetary Sciences Engineering
OPHIOLITE: Jurnal Geologi Terapan adalah terbitan berkala ilmiah yang dikelola dan diterbitkan oleh Program Studi Teknik Geologi Universitas Halu Oleo. Terbitan ini memuat artikel pada topik ilmu geologi maupun geologi terapan. Riset ilmu geologi mencakup riset sains kebumian di bidang geologi, geofisika, dan geokimia. Riset geologi terapan mencakup bidang geologi eksplorasi, geologi rekayasa, mitigasi bencana geologi, hidrogeologi, dan geologi lingkungan.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Teknik Geologi dan Geologi Teknik
Articles 41 Documents
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Rekonstruksi Sejarah Geologi Berdasarkan Analisis Stratigrafi Daerah Pulau Beringin dan Sekitarnya, Kabupaten Lahat, Sumatera Selatan Muhammad Aghil Ikhwanulsyah; Yogie Zulkurnia Rochmana
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 2 (2025): AGUSTUS 2025
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i2.p93-103

Abstract

This study was conducted in Pulau Beringin Village, Lahat Regency, South Sumatra, to reconstruct geological conditions and understand the chronology of sedimentation through stratigraphic analysis. The methods employed include field observations and laboratory-based stratigraphic interpretation. The stratigraphy of the study area, arranged from oldest to youngest, begins with the Saling Formation (KJs), dated to the Late Jurassic–Early Cretaceous, formed by the collision between the Woyla Arc and the West Sumatra Block, resulting in andesitic rocks deposited in a terrestrial setting. It is overlain by the Kikim Formation (Tpok), Paleocene–Oligocene in age, comprising andesitic breccia fragments within a braided fluvial environment. A transgressive phase deposited the Gumai Formation (Tmg) during the Early–Middle Miocene, characterized by carbonate-rich sandstone and shale in a delta front setting. Microfossil analysis confirms its relative age as Middle Miocene. The regressive phase led to the deposition of the Air Benakat Formation (Tma) during the Middle–Late Miocene in a lower delta plain environment, with sandstone and claystone lithologies. The Muara Enim Formation (Tmpm), dated to the Late Miocene–Pliocene, was deposited in an upper delta plain setting, consisting of tuffaceous sandstone and claystone. Finally, the Kasai Formation (Qtk), of Pliocene–Pleistocene age, was deposited in a fluvial environment and comprises conglomeratic sandstone and claystone. The overall depositional sequence was initially driven by tectonic activity, followed by transgressive and regressive cycles.
Hydrogeochemical Analysis to Identify Potential Groundwater Characteristics in the Jayapura Region Felice Deglardini Wopari; Rusmawan Suwarman; Irwan Iskandar
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 3 (2025): Desember: On Progress
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i3.p112-122

Abstract

Hydrogeochemistry and stable isotope δ18O and δ2H are chemical methods used to understand the chemical process of water flows in the aquifer. This study aims to identify the characteristics of groundwater and surface water in the Jayapura area.  Water samples are collected from 87 points throughout the study area. The results of hydrogeochemical analysis on the main ions presented in the piper diagram show that the dominant water type is Ca/Mg-HCO₃-. In addition, other water types such as Ca-HCO₃-, Na-HCO₃-, Mg-SO42-, Ca-Cl, and Na-Cl are found. Rainwater is used as the reference line in the diagram, referred to as LMWL (local meteoric water line), with the equation H = 7.019δ18O + 7.5162 and a correction coefficient of 0.997. Stable isotope analysis of δ18O and δ2H in groundwater and surface water shows that most of the water is within the range of the LMWL reference line. There are two points above the LMWL reference line with Ca-Cl water type. The result of this study indicated that the characteristics of water resources in the Jayapura area are influenced by the interaction between water and mineral weathering near the surface. This interaction provides a natural and good water resource potential in the region.
Studi Alterasi dan Mineralisasi Endapan Hidrotermal di Daerah Jampea, Selayar, Sulawesi Selatan Andi Febby Alvionita; Muhammad Rivaldi Amri; Irzal Nur; Sri Widodo
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 2 (2025): AGUSTUS 2025
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i2.p104-111

Abstract

The sulfide mineralization at each location has distinct mineralization and alteration characteristics depending on its genesis and aspects not previously studied by researchers. This includes the research location, Jampea Island, which requires further identification of several aspects related to sulfide mineralization, such as hydrothermal alteration characteristics, ore and gangue mineral assemblages, mineralization types, and the range of formation temperatures and pH of the hydrothermal fluids that formed them. This study aims to analyze the ore mineral assemblages along with their formation sequence, determine the types of alteration in the research area, and establish a genetic model of sulfide mineralization in the research area. The research was conducted in several stages, including field data collection (samples, location plotting, and documentation), sample preparation, followed by data processing through laboratory analyses consisting of petrographic analysis, mineragraphic analysis, and XRD (X-Ray Diffraction). The results indicate that granite and diorite act as the host rocks for mineralization in the research area. The alteration mineral assemblages associated with mineralization in the research area include quartz, sericite, calcite, chlorite, alkali feldspar, epidote, and dolomite. There are three alteration zones: propylitic, phyllic, and potassic. Mineralization in the research area formed within a temperature range of 200–320°C, with hydrothermal fluid pH ranging from acidic to neutral. The resulting ore mineral assemblages consist of two types: hypogene and supergene, with the minerals including: pyrite, chalcopyrite, bornite, magnetite, chalcocite, and covellite.
Perbandingan Sistem Hidrotermal Air Panas Ciater dan Palimanan: Analisis berdasarkan Komposisi Hidrogeokimia Zulis Septian; Wirandika Mayzzani Hadiana; Fildzah Ayunda; Mary Agustina Putri; Irwan Iskandar
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 2 (2025): AGUSTUS 2025
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i2.p83-92

Abstract

This study compares hot water hydrothermal systems in two locations in West Java, namely Ciater (Subang) and Palimanan (Cirebon), based on hydrogeochemical composition. Ciater, located at the foot of Mount Tangkuban Parahu, is affected by active volcanic activity, while Palimanan is in a carbonate-rich sedimentary basin area. The results of the in-situ measurements showed significant differences in pH, temperature, TDS, salinity, and DO between the two sites. Ciater has an acidic pH, stable temperature, as well as high TDS and salinity, reflecting volcanic influences, while Palimanan has a neutral pH, higher temperatures, and fluctuations in TDS and salinity, which are affected by carbonate rocks. Ion analysis showed that Palimanan hot water is dominated by chloride anion (Na-Cl), while Ciater by sulfate anion (Ca-SO₄). Heavy metals testing revealed higher concentrations of metals in Ciater, reflecting interactions with volcanic rocks, whereas Palimanan has a low metal content. The results of isotope analysis showed that the hot water in Ciater tended to mix with rainwater, while Palimanan showed significant interactions with minerals, especially carbonates. This study provides important insights into the differences in hydrothermal systems at the two sites and their implications for the utilization of geothermal resources.
Identifikasi Sebaran Lapisan Batugamping Dengan Metode Geolistrik Tahanan Jenis di Kecamatan Sawa, Kabupaten Konawe Utara, Sulawesi Tenggara Mochamad Mussoddaq; Hariono La Pili
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 2 (2025): AGUSTUS 2025
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i2.p75-82

Abstract

Limestone is one of the most important non-metallic mineral commodities widely used in the cement, steel, fertilizer, and construction industries. North Konawe Regency, particularly in Sawa District, has significant limestone potential; however, subsurface distribution information remains limited. This study aims to identify the distribution of limestone using the 2D resistivity geoelectrical method with a Wenner–Schlumberger configuration. Measurements were conducted along four survey lines, each 290 meters in length with 10-meter electrode spacing, enabling subsurface investigation down to approximately 57 meters. The acquired data were processed using Res2Dinv software to generate 2D resistivity cross-sections, which were further integrated into a 3D model to estimate resource potential. Interpretation results indicate three main subsurface zones: an aquifer layer with low resistivity (8–33 Ωm), claystone with medium resistivity (64–344 Ωm), and a compact limestone layer characterized by high resistivity (474–14,772 Ωm). The 3D model reveals an extensive and continuous limestone distribution, with an estimated volume of 11,845,136 m³ across an area of 207,790 m². These findings demonstrate that the resistivity geoelectrical method is highly effective for limestone exploration, while also providing accurate preliminary data to support sustainable mineral resource management and utilization planning in the study area.
Mineral Chemistry and The Stability Temperature of Nickel-Iron Sulfide from Kolaka Ultramafic Rocks, Southeast Sulawesi Rio Irhan Mais Cendra Jaya; Syahrul Syahrul; Masri Masri
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 1 (2025): APRIL 2025
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i1.p1-6

Abstract

This study investigates nickel-iron sulfide mineral chemistry and stability from ultramafic rocks in the Kolaka region, Southeast Sulawesi, Indonesia. Sampling was conducted at two Kolaka ultramafic rock outcrop sites in Baula and Wolo sub-districts. The Kolaka Ultramafic Rocks, part of the Kolaka Ophiolite Complex, are primarily composed of lherzolite, harzburgite, olivine websterite, and serpentinites. Sulfide minerals, including pentlandite, pyrite, and chalcopyrite, were observed in these rocks, along with Ni-Fe-rich minerals interpreted as awaruite. Pentlandite, the dominant sulfide mineral, occurs within olivine and chromite replacements, mainly at their rims and serpentine veins. Eight polished sections of ultramafic rocks from both sites were analyzed using EDS SEM to determine the chemical composition of pentlandite. This analysis reveals a variable composition of Ni and Fe, with Ni-rich members more prevalent. Pentlandites from the Baula district have Fe contents of 18.22–27.34 wt%, Ni contents of 32.59–39.10 wt%, and Co contents of 1.24–2.76 wt%, while those from the Wolo district have significantly higher Ni (46.19–53.79 wt%) and Co (2.79–4.18 wt%) contents but lower Fe (8.50–15.18 wt%). Based on the ternary diagram, pentlandites show various formation temperatures (200 to above 600°C). They are separated into two stability groups: Baula’s pentlandite (Ni < 40%, Fe > 18%) with stability temperatures between 200 and 500°C, and Wolo’s Ni-rich pentlandite (Ni > 46%, Fe < 16%) with stability temperatures above 600°C. The formation of Ni-rich pentlandite is attributed to Ni-rich ultramafic rocks reacting with seawater at high temperatures, facilitating efficient Ni scavenging during serpentinization.
Estimasi Sumberdaya Endapan Nikel Laterit Menggunakan Metode IDW Pada Pit Rama PT. Tonia Mitra Sejahtera Kabupaten Bombana, Provinsi Sulawesi Tenggara Muhammad Yasser Arsy Akbar; Erwin Anshari; Muhammad Ilham Kadar
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 1 (2025): APRIL 2025
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i1.p23-30

Abstract

PT. Tonia Mitra Sejahtera is a company engaged in the nickel laterite commodity mining industry with a production operation mining business permit area of approximately ± 5,891 Ha. Currently, the company plans to open a new mining block at Pit Rama with an area of ± 5 Ha. This study aims to determine the amount of resources contained in Pit Rama. This research method is a quantitative study that combines theory with data obtained in the field. The estimation method used is the Inverse Distance Weighted (IDW) method which is determined based on geological conditions and the results of basic statistical analysis that have been carried out with an average drill spacing of 25 meters. The results of the study obtained a total resource volume at Pit Rama of 655,352.56 m3 and has a tonnage of 991,796.88 tons with an average nickel content of 1.74%.
Analisis Kemampugaruan dan Kemampugalian Batuan Peridotit Kabupaten Morowali Utara, Provinsi Sulawesi Tengah Amritzal Nur Firdaus; Isman Saleh; Iswandi Utama
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 1 (2025): APRIL 2025
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i1.p43-48

Abstract

In lateritic nickel mining, peridotite rock serves not only as the primary source of nickel laterite but also plays a crucial role in slope design and the development of mining infrastructure, such as the construction of mine roads. Additionally, economically non-viable peridotite can be repurposed as fill material or construction raw material if it meets specific technical criteria. This study aims to analyze the ripperability and abrasiveness of peridotite rock in the research area to determine the most effective excavation method. The analysis was conducted using joint spacing data and rock strength obtained through measurements of rock mass discontinuities using the scanline survey, uniaxial compressive strength (UCS) tests, and point load tests. The findings indicate that the rock in the study area can be classified into three main categories based on joint spacing and strength: easy ripping, hard ripping, and very hard ripping. Based on the analysis, the recommended heavy equipment includes Bulldozer models D7G and D8K, which are suitable for the rock rippability categories identified at the site. Rocks with high strength values exhibit high abrasiveness, leading to accelerated wear on heavy machinery. Therefore, selecting wear-resistant equipment and implementing more intensive maintenance planning are essential to improving operational efficiency in the study area.
Analisis Geometri Lereng Tambang Terbuka Menggunakan Metode Bishop disederhanakan pada Area Pit ASK Kabupaten Konawe Utara, Sulawesi Tenggara Natasya Puteri Alquarima Ode; Laode Jonas Tugo; Asri Arifin
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 1 (2025): APRIL 2025
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i1.p13-22

Abstract

The study area utilizes open-pit mining methods across all its mining pits and plans to develop a new pit to increase annual production. Slope stability analysis is crucial for designing both single slopes and overall slopes. This research aims to identify the actual profile conditions of laterite nickel and the material characteristics within the ASK pit area, as well as to determine the factor of safety (FoS) and the probability of slope failure (PoF). The study applies slope stability analysis using the limit equilibrium method-Bishop simplified based on Mohr-Coulomb failure criteria. The results indicate that the limonite zone has a wet unit weight of 23.85 kN/m³, cohesion of 31.74 kPa, and an internal friction angle of 30.76°, while the saprolite zone has a wet unit weight of 22.20 kN/m³, cohesion of 26.25 kPa, and an internal friction angle of 29.22°. Based on analysis results, a safe single slope geometry can be applied with a slope angle ranging from 50° to 70°, a height of 6 meters, and a bench width between 1 to 3 meters. For the overall slope geometry, applying a slope angle of 38° to 42° with a bench width of 3 meters, the calculated FoS and PoF values indicate that the proposed slope design is still safe to use, with FoS > 1.1 and PoF between 25%–50%, are above the required standard threshold values.
Kontrol Morfologi pada Profil Vertikal Endapan Nikel Laterit Pulau Kabaena bagian Selatan, Sulawesi Tenggara Jana Cindy Salinding; Masri Masri; Hasria Hasria; Ujang Sugiarno
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 1 (2025): APRIL 2025
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i1.p31-42

Abstract

The southern part of Kabaena Island in Southeast Sulawesi lies within the East Sulawesi Ophiolite Belt and hosts abundant potential for lateritic nickel deposits; yet morphological controls on the thickness and distribution of nickel grades remain poorly understood. This study analyses how variations in topography influence lateritic nickel deposits, focusing on laterite thickness and nickel grade, using morphometric and morphography data derived from a digital elevation model (DEM) and geochemical data from 78 exploration drill holes. Besides examining cross sections, we assessed the distribution of laterite thickness and nickel grade by slope angle and elevation through linear regression. Lateritic nickel profiles can be classified by slope classes (gentle, moderately steep, steep), each showing distinct profile forms and nickel enrichment zones. The results indicate a positive correlation between elevation and laterite thickness (R = 0.52), whereas nickel grade shows a negative trend, decreasing at higher elevations (R = –0.56). In contrast, slope exhibits weak correlations with both laterite thickness (R = 0.20) and nickel grade (R = 0.14), suggesting slope variation does not significantly influence either parameter relative to elevation. On gentle slopes, average nickel grades are relatively higher than on steep and moderately steep slopes, with laterite thickness varying. The observation that laterite profiles differ at similar elevations and slopes implies that other geological factors also influence the distribution of lateritic nickel.

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