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All Journal Journal of Geoscience, Engineering, Environment, and Technology PROMINE Mining Science and Technology Journal
Septiana, Sara
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science Physics

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Studi Diagenesis Batugamping Formasi Meluhu Daerah Toronipa, Kecamatan Soropia, Kabupaten Konawe, Provinsi Sulawesi Tenggara Hasria, Hasria; Jalil, Abdul; Masri, Masri; Okto, Ali; Bahdad, Bahdad; Septiana, Sara
PROMINE Vol 11 No 1 (2023): PROMINE
Publisher : Program Studi Teknik Pertambangan, Fakultas Sains dan Teknik, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jp.v11i1.3008

Abstract

The research area is administratively located at Toronipa, Soropia District, Konawe Regency, Southeast Sulawesi Province. The purpose of this study was to determine the type of limestone, the diagenes process and the environment of limestone diagenesis in the Meluhu Formation. The method used in this research is the petrographic method. The results showed that the types of limestone in the study area were wackestone and packstone which had undergone a diagenesis process in the form of cementation, microbial micritization, neomorphism, and dissolution. The limestone diagenesis environment in the Meluhu Formation originates from the marine phreatic, meteoric phereatic, and meteoric vadose diagenesis environments.
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.
Analisis Kadar MgO dan SiO2 Analisis Perbandingan Kadar Mgo Dan Sio₂ Pada Endapan Nikel Laterit Di Daerah Boedingi, Sulawesi Tenggara Lantapi, Adriansyah Wuriadin; Alhabsyi, Gina Audina P; Raivel, Raivel; Septiana, Sara; Satapona, Alwan; Winarno, Winarno
Mining Science And Technology Journal Vol 5 No 1 (2026): Mining Science and Technology Journal
Publisher : Program Studi Teknik Pertambangan, Fakultas Teknik, Universitas Sulawesi Tenggara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54297/minetech-journal.v5i1.1463

Abstract

Sulawesi Tenggara merupakan salah satu wilayah prospektif pembentukan endapan nikel laterit yang berkembang pada batuan ultramafik dan mengalami proses lateritisasi intensif. Perbedaan kadar MgO dan SiO₂ menjadi parameter penting dalam menafsirkan karakter geokimia, tipe endapan, serta kualitas bijih nikel laterit. Penelitian ini bertujuan untuk menganalisis perbandingan kadar MgO dan SiO₂ pada endapan nikel laterit di Daerah Boedingi, Sulawesi Tenggara, khususnya pada Pit A dan Pit E. Metode yang digunakan adalah metode deskriptif-analitik melalui observasi geologi lapangan, identifikasi litologi, pengambilan sampel bijih laterit, preparasi sampel, serta analisis geokimia menggunakan instrumen X-Ray Fluorescence (XRF) Epsilon 4. Hasil penelitian menunjukkan bahwa Pit A memiliki kadar MgO sebesar 30,28% dan SiO₂ sebesar 40,29%, lebih tinggi dibandingkan Pit E yang memiliki kadar MgO sebesar 17,05% dan SiO₂ sebesar 36,33%. Perbedaan tersebut menunjukkan variasi karakter lateritisasi dan litologi batuan induk, dimana Pit A yang berasosiasi dengan litologi dunit cenderung memiliki karakter lebih magnesian dan siliceous, sedangkan Pit E yang berasosiasi dengan harzburgit menunjukkan kecenderungan lebih ferruginous dan aluminous. Berdasarkan karakter geokimianya, Pit A diinterpretasikan sebagai tipe endapan laterit oxide deposit, sedangkan Pit E lebih mencerminkan tipe hydrous silicate deposit. Dengan demikian, perbandingan kadar MgO dan SiO₂ dapat digunakan sebagai dasar dalam interpretasi karakter endapan, kualitas bijih, dan arahan kegiatan eksplorasi maupun penambangan nikel laterit secara lebih selektif.
Co-Authors Abdul jalil Alamyah, Wa Ode Nur Alhabsyi, Gina Audina P Bahdad, Bahdad Hasria Hasria Hasria, Hasria Jaya, Rio Irhan Mais Cendra Lantapi, Adriansyah Wuriadin Masri Masri Muhamad Safar Okto, Ali Raivel, Raivel Satapona, Alwan Syahrul Winarno Winarno