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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 35 Documents
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Provenance dan Implikasi Tektonik Batupasir Formasi Sawahtambang, Kabupaten Sijunjung, Sumatra Barat Putri, Helen Dwi; Setiawan, Budhi; Rochmana, Yogie Zulkurnia
OPHIOLITE: Jurnal Geologi Terapan Vol 6 No 2 (2024): OKTOBER 2024
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v6i2.p72-79

Abstract

The Sawahtambang Formation in Sijunjung Regency, West Sumatra, is primarily composed of thick sandstones, which are of significant interest due to their potential as oil and gas reservoirs. However, the mineralogical and petrographic characteristics, as well as the depositional and tectonic origins of these sandstones, remain poorly understood, particularly in relation to the tectonic processes that influenced their formation. This knowledge gap poses challenges for accurate geological interpretation and resource assessment. The objective of this study is to investigate the mineral composition, petrographic properties, and provenance of the sandstones from the Sawahtambang Formation. The methodology employed includes petrographic analysis and provenance studies. The results of the provenance analysis indicate that the sandstones are derived from a Recycled Orogen source, suggesting that they were primarily formed in collision or subduction zones. This tectonic setting is characterized by a low feldspar and volcanic lithic content and a higher quartz content. The findings of this study contribute to a more comprehensive understanding of the geological information and origin of the Sawahtambang Formation sandstones in West Sumatra
Pengembangan Berkelanjutan Kawasan Karst sebagai Kawasan Hutan Konservasi: Pendekatan Potensi Geologi di Daerah Ratatotok, Sulawesi Utara Rachmadhan, Harman; Masulili, Febryanto; Najoan, Alvaro; Janis, Regina; Pesik, Gresyella
OPHIOLITE: Jurnal Geologi Terapan Vol 6 No 2 (2024): OKTOBER 2024
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v6i2.p53-63

Abstract

The development of the karst region in Ratatotok, North Sulawesi, requires an integrated geological approach for effective conservation forest management. This research utilizes geospatial analysis and geological mapping to understand the geological dynamics and geohazard potential in the area. Six main rock units were identified: Andesite-Basalt Lava, Marl Limestone, Crystalline Limestone, Basalt Breccia, Sandstone, and Alluvial Deposits. The complex geological structures, including fractures and faults with a main orientation of Southeast-Northwest, reflect the regional tectonic influence from the subduction between the Pacific Plate and the Indo-Australian Plate, specifically the Molucca Sea Plate. Drainage pattern maps reveal two main flow directions influenced by the structures, with intense erosion. The geomorphological map depicts four primary landforms: Denudational Karst Slopes, Denudational Hills, Karst Alluvium Plains, and Karst Valleys, reflecting karst activity in the landscape. The geohazard risk map shows potential geohazards such as landslides, rock falls, and subsidence, indicated based on the overlay of lithology, slope, and geological structures. Forest conservation and ecotourism in this area offer opportunities, with karst caves as a major attraction. Ecotourism management must adhere to sustainability principles to prevent environmental damage. Management strategies include establishing tourism and conservation zones and involving local communities in sustainable management. Partnerships with stakeholders and routine monitoring are crucial for the success of conservation and development in the Ratatotok karst area.
Klasifikasi Batuan Perangkap Aspal Batu Buton (Asbuton) Berdasarkan Analisis Geokimia di Desa Winning, Kecamatan Pasarwajo, Kabupaten Buton, Provinsi Sulawesi Tenggara Saleh, Isman; Firdaus, Amritzal Nur
OPHIOLITE: Jurnal Geologi Terapan Vol 6 No 2 (2024): OKTOBER 2024
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v6i2.p100-106

Abstract

This research is located in the IUP area of PT Wijaya Karya Bitumen, C Block Kabungka Mine, Winning Village, Pasarwajo District, Buton Regency, Southeast Sulawesi Province. This study aims to classify asbuton trap rocks based on their chemical composition with XRF (X-ray fluorescence) and XRD (X-Ray Diffraction) analysis. The results of the XRF analysis showed that the asbuton trap rocks in the research area were dominated by CaO, MgO and SiO2 compounds. The CaO content varies between 24.56% to 44.46%. The SiO2 content in the samples varies, ranging from 7.81% to 12.54%. Three samples, namely TR1C-001, TR1C-002, TR1C-003 each contain MgO 0.57%, 0.85%, and 0.96%, while the other two samples, namely TR2C-001, TR2C-002 each contain MgO 14.40% and 17.51%, respectively. The results of XRD analysis showed three dominant minerals, namely Calcite (CaCO3), Quartz (SiO2) and Dolomite (CaMg(CO3)2). Based on the results of geochemical analysis (XRF and XRD) showed that the asbuton trap rock in the study area consists of 2 (two) types of carbonate rocks, namely Argillaceous Limestone with a CaCO3 content of 76.6% to 79.7% and slightly calcitic dolomite.
Rancangan Desain Sump pada Pit Jamrud Kabupaten Konawe Utara Sulawesi Tenggara Ambarsari, Ika Sartika; Deniyatno; Anshari, Erwin; Setiawan, Arif
OPHIOLITE: Jurnal Geologi Terapan Vol 6 No 2 (2024): OKTOBER 2024
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v6i2.p64-71

Abstract

A sump is a drainage facility located at the bottom of the pit. The sump design must be appropriate so that runoff water flowing on the surface can be maximally accommodated. This can overcome stagnant water on the ground and avoid disruptions to mining productivity. Jamrud Pit has an area of 4.14 ha and is mined using the open pit method. The purpose of this research is to calculate and analyze the water discharge that will enter the sump and design the sump according to the volume of runoff water entering the sump. Based on the research results, there are two sumps placed at the bottom of the pit according to the pit cross-section model. Sump 1 has a runoff water volume of 2,914.24 m3, so it is designed with a top area of 27 x 27 m2 and a base area of 21 x 21 m2 with a depth of 5 m and can accommodate a water volume of 2,997.6 m3. While in sump 2, the volume of incoming runoff water is 579.85 m3, so it is designed with a top area of 14 x 14 m2 and a base area of 8 x 8 m2 with a depth of 5 m so that it can accommodate a water volume of 663.18 m3. The sump cross-section model is adjusted to the characteristics of the soil layer, namely the trapezoidal model.
Analisis Fragmentasi Hasil Peledakan Batugamping dengan Metode Pemrosesan Gambar Digital Menggunakan Perangkat Lunak Wipfrag Yudha, Wira; Aldiyansyah; Tugo, Laode Jonas
OPHIOLITE: Jurnal Geologi Terapan Vol 6 No 2 (2024): OKTOBER 2024
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v6i2.p92-99

Abstract

Monitoring and evaluation of blast fragmentation are critical to achieving the most optimal design and outcomes. Several methods are utilized to assess the effectiveness of blasting in the field, one of which is the digital image analysis method, which has gained popularity in recent years. This study aims to apply the digital image analysis technique to rock fragments resulting from blasting and compare the results with empirical analysis using the Kuz-Ram equation. The digital image analysis was conducted using data from three blasting activities in a limestone quarry, with the number of blast holes as follows: 130 in blast-01, 86 in blast-02, and 90 in blast-03. The spacing and burden used in the blast designs were 2.5 m and 2 m, respectively, for all three blasting activities. The results revealed that the largest deviation of 60% occurred at the 10 mm sieve size for blast-02 compared to the Kuz-Ram model. Rock fragments from blast-01 passed 80% at a sieve size of ±280 mm, while for blast-02 and blast-03, 80% of the material passed at sizes >=600 mm. The analysis showed that the percentage passing graph R(X) for all three blasting activities, as determined through the Kuz-Ram method, exhibited relatively close values, albeit with some deviations. After analyzing the three blasting activities with identical designs, the results obtained using the WipFrag software demonstrated satisfactory performance for preliminary field monitoring purposes.
Karakterisasi Sistem Panas Bumi Non-Vulkanik pada Manifestasi Air Panas Biatan Bapinang: Studi Pendahuluan Maulida, Nanda Hanyfa; Puspita, Octa Della; Hidayatika, Akroma; Mulyasari, Rahmi
OPHIOLITE: Jurnal Geologi Terapan Vol 6 No 2 (2024): OKTOBER 2024
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v6i2.p80-91

Abstract

The emergence of hot spring manifestations in Biatan Bapinang, East Kalimantan, is intriguing due to its location, far from active volcanic and tectonic regions. This study aims to investigate possible causes and characteristics of this geothermal system using geological analysis and Bouguer anomaly distribution. Regional geological data and a Digital Elevation Model (DEM) were used to examine rock formations and potential structures that could serve as pathways for hot fluid migration. Bouguer anomaly distribution provided insights into density variations associated with basement depth. Findings indicate that the Biatan Bapinang hot spring manifestation lies at the boundary between a sedimentary basin and a basement uplift. The fluid likely originates from the sedimentary basin, with basement uplift potentially enhancing heat flow that warms subsurface water. Lithological boundaries and possible subsurface structures create preferential pathways for hot fluids to reach the surface. This study suggests that the Biatan Bapinang geothermal system is a non-volcanic, intraplate basin-type system, with a probable heat source from terrestrial heat flow concentrated by the basement uplift and local geological configuration. This research opens opportunities for further studies on geothermal potential in non-volcanic regions, especially in the Biatan area.
Pemodelan Endapan dan Estimasi Sumberdaya Batubara dengan Block Model di PT Batubara Jambi Lestari Kecamatan Mestong Kabupaten Muaro Jambi Aliffano, Yulian; Yulanda, Yudi Arista; Hakim, Muhammad El
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.p67-74

Abstract

Jambi Province holds significant potential in energy and mineral resources, particularly coal, part of which has been exploited while others are still under exploration. PT Batubara Jambi Lestari plans to develop an open-pit mine in the northern block of its IUP-OP area, necessitating deposit modelling and coal resource estimation as the basis for mine planning. Thus far, coal modelling has generally relied on stratigraphic models for geological interpretation, whereas the application of block models to coal deposits remains limited. This study seeks to address this gap by examining the use of block models in coal deposit modelling. Resource estimation was conducted using the Nearest Neighbour Point (NNP) method, selected due to its suitability for relatively homogeneous coal deposits, computational efficiency, and minimal bias against local variability. The research focused on the northern block of the Muara Enim Formation, the main coal-bearing formation, with modelling carried out through correlation between drill holes. The resulting model illustrates a deposit shaped like a horse back, characterized by coal seams and sediments arching upward due to compressional forces, with an average dip of 12°. The application of the block model required manual adjustments through a trial-and-error approach to ensure consistency with the geological database, but it successfully represented the geological conditions. The estimation results indicate a measured coal resource of 2,013,750 tons, which provides an important reference for mine planning at PT Batubara Jambi Lestari.
Evaluating ascent condition during the formation of 723 CE vulcanian eruption of Kelud: Implication for hazard Indriyanto, Jananda Nuralam
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.p49-58

Abstract

The 723 CE eruption of Kelud volcano in East Java, Indonesia, provides critical insights into the ascent dynamics and pre-eruptive conditions of explosive vulcanian eruption. This study examines textural and compositional variations in the groundmass and microlite morphologies of lithic-rich pyroclastic density currents (PDCs) and pumice fallout deposits from the different stages of the 723 CE eruption. Petrographic and geochemical analyses reveal contrasting ascent conditions between different clast types and eruptive stages. Lithic clasts, dominated by euhedral microlites and evolved rhyolitic groundmass compositions, crystallized under slow magma ascent and limited degassing within a dense plug or lava dome. In contrast, pumice clasts, characterized by skeletal microlites and dacitic groundmass compositions, reflect rapid magma ascent and fragmentation during explosive eruption phases. These findings highlight the dynamic interplay of crystallization, degassing, and conduit processes that govern vulcanian eruptions, particularly at Kelud. This study underscores the importance of petrological approaches in analyzing the eruptive products of vulcanian eruptions to better understand the magmatic processes responsible for such events and to improve hazard assessments for future similar eruptions.
Analisis Derajat Pelapukan Massa Batuan Menggunakan Analisis Petrografi dan Uji Kuat Tekan Uniaksial (UCS) Pada Penambangan Kaolin Daerah Semin, Gunung Kidul, Yogyakarta Rianse, Mohammad Suriyaidulman; Anshari, Erwin; Ulfa, Abd. Hadid Rahman; Taliding, Tri Utomo
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.p59-66

Abstract

Rock mass weathering is a crucial process that affects the strength and stability of slopes, particularly in mining areas such as Semin, Gunung Kidul. This study aims to analyze the degree of weathering of rock masses in the kaolin mining area using petrographic analysis and uniaxial compressive strength (UCS) testing. Rock samples were collected from three different locations representing varying material conditions based on macroscopic appearance. All the samples are of Altered Mudrock lithology. Sample I is dominated by primary minerals (plagioclase) with a small amount of clay minerals, classified as fresh (grade I). Sample II, which exhibits increased secondary mineral content and porosity, is categorized as slightly weathered (Grade II). Sample III, dominated by secondary minerals (clay and oxides) and with a very low UCS value, is classified as completely weathered (grade V). The results indicate that as the degree of weathering increases, the content of secondary minerals also increases, while the rock strength decreases. Weathering processes, both physical and chemical, alter the mineral composition of rocks, making them more brittle and susceptible to mechanical failure. This study offers valuable insights into how weathering impacts rock stability in mining areas, with implications for safer mine planning and management.
Analisis Komposisi Mineral Lempung dan Maturitas Material Organik Daerah Balikpapan Selatan, Kota Balikpapan, Kalimantan Timur Jamaluddin, Jamaluddin; Oscar, Agus Wiramsya; Manik, Nijusiho; Umar, Emi Prasetyawati
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 3 (2025): On Progress
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i3.p123-132

Abstract

The research aims to analyze the influence of clay mineral composition on the thermal evolution of source rock in the South Balikpapan area, Balikpapan City, East Kalimantan. Mudstone samples were analyzed by vitrinite reflectance (Ro), X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD analysis results show that the predominant clay minerals in the mudstone are mixed illite/smectite (35-42%), kaolinite (30-39%), illite (18-23%), and chlorite (5-10%). The predominant mineral presence of illite/smectite indicates a high heat retention capability. This plays an important role in the process of diagenesis and thermal transformation. High heat retention allows for localized temperature increases that further influence the thermal evolution of the host rock. The kaolinite mineral, which reaches 30-39%, contributes to the thermal stability of the host rock due to its inert nature in the medium temperature range. Meanwhile, the presence of illite minerals (18-23%) also supports thermal stability but with a smaller role than kaolinite. Otherwise, chlorite (5-10%) can increase the chemical reactivity of minerals under high temperature conditions, potentially triggering mild metamorphic reactions in rocks. The Ro values obtained from the samples range from 0.33% to 0.47%, which indicates a low to medium level of thermal maturity. This maturity level indicates that the mudstone rocks in the South Balikpapan area have not reached the optimal condition to produce hydrocarbons. These vitrinite reflectance values correspond to the estimated maximum temperature that the rocks have experienced, which is likely not high enough to trigger the formation of significant amounts of oil or gas.

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