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Journal : Journal of Geoscience, Engineering, Environment, and Technology

 1 
Petrochemistry of Ultramafic Rock in Baula - Pomalaa Ophiolite Complex, Southeast Sulawesi, Indonesia Cendrajaya, Rio Irhan Mais; Juarsan, Laode Ihksan; Masri; Rubaiyn, Al; Syahrul; Neni; Ramadani, Suci; Hasria
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 1 (2024): JGEET Vol 09 No 01 : March (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.1.14491

Abstract

Baula and Pomalaa Ophiolitic Complexes are part of East Sulawesi Ophiolite (ESO). The ultramafic rocks in the Baula and Pomalaa Ophiolite Complex mainly is peridotite and consist of harzburgite, lherzolite and olivine websterite, mostly serpentinized. Chemical and petrological research has focused on minerals, such as olivine, pyroxene, and spinel. This study examines the tectonic setting and temperature of ultramafic rock formation. Twelve ultramafic rock samples were examined using geothermometers made of pyroxene, petrographic examination, and coexisting olivine and spinel analyses. SEM and petrographic analysis of pyroxene lamellae and mylonite-ultramylonite structures allowed for the measurement of the geothermometer of ultramafic rocks. Using SEM-EDS, the coexistence of olivine and spinel was analyzed to determine the type of ultramafic tectonic setting. In the coexistence of olivine and spinel, olivine and spinel oxide compounds as tectonic setting markers in the form of Fo and Cr# values. Ultramafic rocks have different temperature levels, based on pyroxene thermometer, and the first one starts at a high temperature of 1000-1200ºC. It is characterized by thin, elongated augite lamellae. Instead, large lamellae characterize augite at medium temperatures (800–1000ºC). Irregular, anhedral, and broader forms of enstatite lamellae are typical of low temperatures (500–800ºC). Different generations of exsolution lamellae indicate that magma cooling was gradual. The distribution of #Fo ranged from 0.87 to 0.92, and Cr# values ranged from 0.13-0.19. According to coexisting olivine and spinel analysis. On the Olivine-Spinel Mantle Array (OSMA), the Fo and Cr# plot indicates that the peridotites tectonic setting was from the ocean floor and the magmatism was from MORB (Mid Oceanic Ridge Basalt). The Al2O3 vs. TiO2 pattern in spinel lherzolite also similar with Ampana and Kabaena peridotites magmatism.
Petrogenesis of Metamorphic Rock in the Mukito Formation at Sorawolio Region, Bau-Bau City, Buton Island, Southeast Sulawesi Province, Indonesia Hasria; La Hamimu; Prawira, Andi Bhaskara; Arisona; Juarzan, Laode Ihksan; Sara Septiana
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 3 (2024): JGEET Vol 09 No 03 : September (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.3.14949

Abstract

The petrogenesis study of the metamorphic rocks of the Mukito Formation was carried out in the Sorawolio area, Bau-Bau City, Buton Island, Southeast Sulawesi Province, Indonesia. This research area is included in the southern part of the Buton sheet with coordinates S 5⁰23'40.8'' and E 122⁰43'44.9''. The aim of this research is to determine the petrogenesis of metamorphic rocks which includes determining the rock type, facies, type of metamorphism and protolith. The research methods used include megascopic and microscopic analysis of rocks in the form of petrographic analysis which includes identification of mineral content and rock texture and geochemical analysis in the form of XRF tests to determine the main oxide elements in metamorphic rock samples. Data obtained from the results of petrographic analysis show that the research area consists of several types of metamorphic rock, namely serpentinite, phyllite, chlorite schist, hornblende schist and amphibolite. The metamorphic rocks in the research area are included in the greenschist facies and amphibolite facies with regional metamorphism types as well as protoliths from igneous rocks in the form of basalt rock which were formed in the tholeiitic oceanic-island tectonic environment which is a convergent complex characterized by continental origin in the magma series in the form of the tholeiitic series and calc -alkaline series.
Application of Audio Frequency Magnetotelluric (AMT) Method for Nickel Mineral Exploration in Area Laeya District, South Konawe Regency, Southeast Sulawesi Province, Indonesia Hasria; P. Ramba, Jeremy Patrio; Safani, Jamhir; Arisona; Junursyah, G.M. Lucki
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 3 (2025): JGEET Vol 10 No 03 : September (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.3.23200

Abstract

The AMT (Audio Frequency Magnetotelluric) method is a geophysical method that uses natural sources (passive method) so it does not require artificial sources and is very effective in mapping the resistivity contrast of subsurface rocks. The AMT (Audio Frequency Magnetotelluric) method is a geophysical method that uses natural sources (passive method) so it does not require artificial sources and is very effective in mapping the contrast of subsurface rock resistivity. This study aims to determine the coherence and nickel mineralization zones in the Laeya District area, South Konawe Regency, Southeast Sulawesi Province using the AMT method and supported by using drill data. The coherence of AMT data in the Laeya District area, South Konawe Regency based on the magnitude and phase curves of apparent resistivity after the XPR selection process experienced a significant increase in data quality at all points indicated at point LY02 from 49.09% coherence to 78.32%. Nickel mineralization zone based on 2D cross-section data of AMT resistivity and Drilling data in Laeya District, South Konawe Regency shows the distribution of nickel enrichment areas which are qualitatively marked by light blue color with resistivity values of 11 to 21 Ohm m located at points LY03, LY04, LY06, LY07 and LY08. Drilling data shows the presence of limonite layers at drill points DHB15 and DHB16. The presence of Sulawesi Molasa which is a feature of nickel deposits in the South Konawe area is also detected in the 2D cross-section.
Influence of Laterite Bedrock on Ni Content in Langgikima District, North Konawe Regency, Southeast Sulawesi, Indonesia Hasria; Okto, Ali; Rio Irhan Mais Cendra Jaya; Alamyah, Wa Ode Nur; Safar, Muhamad; Septiana, Sara; Syahrul
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 4 (2025): JGEET Vol 10 No 04 : December (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.4.24735

Abstract

This study investigates the influence of bedrock on nickel (Ni) content in laterite deposits in the Lameruru Region, Langgikima District, North Konawe Regency, Southeast Sulawesi Province, Indonesia. The research area is dominated by ultramafic rocks, which are potential sources of laterite nickel. The study employs literature review, field surveys for lithological data collection and representative sampling, petrographic analysis to determine mineral composition and rock types, and geochemical analysis using X-Ray Fluorescence (XRF) to determine nickel content in the rocks. The results show that the bedrock in the study area consists of harzburgite and olivine pyroxenite. Harzburgite, occupying approximately 72.72% of the area, is composed of 54-78% olivine, 15-45% orthopyroxene, 6% clinopyroxene, and accessory minerals, while olivine pyroxenite, occupying about 27.28% of the area, is composed of 27% olivine, 49% orthopyroxene, 17% serpentine, and 7% spinel. Geochemical analysis reveals that harzburgite has higher Ni content (0.10-0.16%) compared to olivine pyroxenite (0.03-0.10%). The distribution of Ni in the bedrock and saprolite is directly proportional, with higher Ni content in harzburgite in both zones. The study concludes that the type of bedrock greatly influences the nickel content in laterite deposits, with harzburgite having a higher Ni content due to its higher percentage of olivine minerals, which are the main hosts of nickel in ultramafic rocks.
Co-Authors Achmad Lutfi Fuadi Ahmad Rudiyansyah Al Firman Alamyah, Wa Ode Nur Ali Okto Arisona Arisona Arisona Astuti, Silfia Bahdad Chintya Mei Eldin Fiqriawan, M. Ridho G.M. Lucki Junursyah, G.M. Lucki Hafizh Agil Musyaffa Harisma Hasir, Muhammad Ihksan Juarsan, Laode Irwan Hardi Kusuma Isman Saleh Jaya, Rio Irhan Mais Cendra Juarsan, Laode Ihksan Juarzan, Laode Ihksan La Hamimu La Ode Ngkoimani, La Ode Lulu Kaoniah Masri Masri Masri Muhamad Safar Muliddin NENI Ngkoimani , La Ode Novariman Nur Firdaus, Amritzal Okto, Ali P. Ramba, Jeremy Patrio Praja, Nia Kurnia Pramadana, Reza Prawira, Andi Bhaskara Ramadani, Suci Razak Haraty, Syamsul Rubaiyn, Al Safani, Jamhir Sara Septiana Septiana, Sara Syahrul Tian Agustina Zhaki Apriyan Zhodik