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All Journal Journal of Degraded and Mining Lands Management Jurnal Teknologi Mineral dan Batubara Journal of Geoscience, Engineering, Environment, and Technology JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Jurnal Geomine Jurnal Mineral, Energi dan Lingkungan Jurnal Geosains dan Teknologi Jurnal GEOSAPTA JAGAT (Jurnal Geografi Aplikasi dan Teknologi) Jurnal Mineral, Energi dan Lingkungan Jurnal Abdidas Journal of Community Development Ophiolite : Jurnal Geologi Terapan Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) OPHIOLITE : Jurnal Geologi Terapan Jurnal Teknologi Mineral dan Batubara Jurnal Rekayasa Geofisika Indonesia
Masri Masri
Teknik Geologi, Universitas Halu Oleo, Kendari
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Environmental Science Health Professions Materials Science & Nanotechnology Mathematics Mechanical Engineering Nursing Physics Public Health Social Sciences Other

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Inventarisasi Keragaman Geologi Daerah Mawasangka Timur, Kabupaten Buton Tengah, Provinsi Sulawesi Tenggara Hasria, Hasria; Hamid, Fanul; Okto, Ali; Muliddin, Muliddin; Masri, Masri; Arisona, Arisona; Harisma, Harisma; Ngkoimani, La Ode; Sawaludin, Sawaludin; Salihin, La Ode Muhammad Iradat
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 3 (2025): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i3.852

Abstract

Fenomena geologi yang berhubungan dengan aspek bentang alam di daerah Mawasangka Timur, Kabupaten Buton Tengah, Provinsi Sulawesi Tenggara mempunyai fitur yang beragam dan secara umum disusun oleh satuan batugamping Formasi Wapulaka yang berumur Pleistosen. Penelitian ini bertujuan untuk menginventarisasi potensi keragaman geologi (geodiversity) yang mendasarkan pada aspek bentang alam karst dan pantai. Fitur keragaman geologi di kawasan karst mencakup baik gejala endokarst seperti gua dan ragam jenis hiasan gua di dalamnya maupun gejala exokarst seperti bukit pepino, dolina, dan akumulasi air di lekuk dolina yang membentuk danau. Di kawasan pantai terjadi sedimentasi pasir putih di pantai landai yang penyebarannya membentuk spit, serta undak-pantai, stack, notches dan sea-cave. Aneka fitur fenomena geologi yang terinvetarisasi tersebut didukung oleh struktur geologi. Metode penelitian yang digunakan adalah melakukan inventarisasi melalui pemetaan keragaman geologi, yaitu berupa pengambilan data lapangan meliputi, litologi, geomorfologi, dan struktur geologi, yang dilengkapi informasi titik koordinat lokasi dan potret). Keragaman geologi tersebut tersebar di seluruh wilayah penelitian, terutama di bagian selatan dan timur.   Kata Kunci: Keragaman geologi, Wapulaka, karst, dolina, gua, Mawasangka Timur.     Abstract- Geological phenomena related to landscape aspects in the East Mawasangka area, Central Buton Regency, Southeast Sulawesi Province have diverse features, which mainly composed of limestones unit of the Pleistocene Wapulaka Formation. This study aims to inventory the potential of geological diversity based on aspects of karst and coastal landscapes. Features of geological diversity in karstic areas include both endokarst phenomena such as caves and various types of cave decoration as well as exokarst phenomena such as pepino hills, doline, and water accumulation in doline depression that form lakes. In the coastal area, white sand sedimentation occurs on sloping beaches that spread to form spits, as well as coastal terraces, stacks, notches, and sea caves. The various features of the inventoried geological phenomena are supported by geological structures. The research method used was to conduct an inventory through geological diversity mapping, in the form of field data collection (lithology, geomorphology, geological structure, location coordinates, and portraits). The geological diversity is spread throughout the study area, especially in the south and east.   Keywords: Geodiversity, Wapulaka, karst, doline, cave, East Mawasangka.
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.
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.
Co-Authors Adriyansyah Adriyansyah Agriawan, Husran Al Firman Al Firman, Al Firman Ali Okto Ali Okto Ali Okto Ali Okto Ali Okto Andri Slamet Subandrio Anshari, Erwin Arisona Arisona Arisona Arisona, Arisona Asruddin, La Ode Atodding, Wa Ode Sitti Jumrana Awaliah, Waode Rizky Bahdad Bahdad Darnawati Darnawati Deniyatno, Deniyatno Erick Riyanto Erzam S Hasan Erzam S. Hasan Febiyanti Fuad Jafar Golok Jaya, La Ode Muhammad Hamid, Fanul Harisma Buburanda, Harisma Hasria Hasria - Hasria Hasria Hasria Hasria Hasria Hasria Hasria Hasria Hasria Hasria Hasria Hasria, Hasria Ihksan Juarsan, Laode Imam Achmad Sadisun Jana Cindy Salinding Jaya, Rio Irhan Mais Cendra Juarsan, Laode Ihksan Khalifa Akbar La Hamimu La Hamimu La Ode Dzakir La Ode Muhamad Ahdiarno La Ode Muhammad Iradat Salihin La Ode Ngkoimani La Ode Ngkoimani, La Ode Laode Ngkoimani Laode Ngkoimani Marwan Zam Mili Marwan Zam Mili Mili, Marwan Zam Muhamad Jerniawan Muhammad Arba Azzaman Muhammad Arba Azzaman Muhammad Arif Muliddin Nafiu, Waode Rizky Awaliah NENI Nurul Fauziah Okto, Ali Phill Richard Saranga Pramadana, Reza Ramadani, Suci Razak Haraty, Syamsul Resmin, Masrandi Restele, La Ode Reza Pasca Purniawan Misu Rifai, Laode Ahmad Rika Yustika Rio Irhan Mais Cendra Jaya Riska Rubaiyn, Al Sahiddin, La Ode Saldi Muhammad Salihin, La Ode M. Iradat Salihin, La Ode Muhammad Iradat Sara Septiana Sawaludin Sawaludin, Sawaludin Sitti Sulaeha Suryawan Asfar Suryawan Asfar Suryawan Asfar Suwardi, Wa Ode Syahrul Syahrul Syahrul Syahrul Syahrul Syamsul Razak Haraty Syamsul Razak Haraty Tugo, Laode Jonas Ujang Sugiarno Wahab Wahab Wahab Wahab Wahab