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Program Studi Teknik Geologi Lt. 2 Gedung Fakultas Matematika dan Ilmu Pengetahuan Alam Kampus Hijau Bumi Tridharma Universitas Halu Oleo, Anduonohu, Kendari, 93232
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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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Rekonstruksi Sejarah Geologi Berdasarkan Analisis Stratigrafi Daerah Pulau Beringin dan Sekitarnya, Kabupaten Lahat, Sumatera Selatan Ikhwanulsyah, Muhammad Aghil; Rochmana, Yogie Zulkurnia
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 Wopari, Felice Deglardini; Suwarman, Rusmawan; Iskandar, Irwan
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.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 Alvionita, Andi Febby; Amri, Muhammad Rivaldi; Nur, Irzal; Widodo, Sri
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 Septian, Zulis; Hadiana, Wirandika Mayzzani; Ayunda, Fildzah; Putri, Mary Agustina; Iskandar, Irwan
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 Mussoddaq, Mochamad; La Pili, Hariono
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.

Page 4 of 4 | Total Record : 35

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