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Ninasafitri Ninasafitri
Program Studi Teknik Geologi, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Gorontalo
Humanities Education Environmental Science Social Sciences Other

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Studi Geologi Daerah Bukit Harapan Kecamatan Bua Kabupaten Luwu Provinsi Sulawesi selatan Abdul Rizal Muladi; Aang Panji Permana; Ninasafitri Ninasafitri
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Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jrpi.v3i2.39001

Abstract

This study aims to examine the geological conditions of the Bukit Harapan area, Bua District, Luwu Regency, South Sulawesi. The study focuses on geomorphological, stratigraphic, and geological structural aspects based on field mapping data. The methods used include direct observation, geomorphological analysis, and interpretation of field geological data. The results indicate that the study area is composed of denudational hill geomorphological units and alluvial plains. Stratigraphically, the area consists of a gabbro unit as the oldest rock unit and alluvial deposits as the youngest unit. The geological structure developed in the area is represented by joints (tension joints), reflecting the influence of regional stress. These geological conditions demonstrate the relationship between lithology, geomorphic processes, and geological structures in shaping the landscape of the study area.
Kontrol Topografi Terhadap Distribusi Ketebalan dan Pengayaan Nikel Laterit Desa Torete Morowali Aulya Tiara Putri; Muh Kasim; Ninasafitri Ninasafitri
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Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jrpi.v3i2.39000

Abstract

This study aims to analyze the influence of slope gradient on the distribution of laterite profile thickness and nickel (Ni) grade in Bungku Pesisir District, Morowali. The research methods include surface geological mapping, petrographic analysis, and geochemical analysis using X-Ray Fluorescence (XRF). The results indicate that slope gradient is the primary controlling factor in the lateritization process. Gentle slopes tend to have thicker laterite profiles, reaching up to 31.2 m at TRT-19, whereas steeper slopes show significantly thinner profiles, approximately 10 m at TRT-35. In addition to morphometric factors, the presence of rock fractures enhances water infiltration, which in turn intensifies the leaching of chemical elements. The distribution of Ni grade reaches its maximum in the saprolite zone due to supergene enrichment processes controlled by groundwater mobility. It is concluded that the interaction between slope morphology and rock structure plays a significant role in controlling the distribution and quality of lateritic nickel deposits in the study area.
Karakteristik Kondisi Geologi Daerah Lamo, Kecamatan Pagimana, Kabupaten Banggai, Provinsi Sulawesi Tengah. Ariyanto Pakaya; Yayu Indriati Arifin; Ninasafitri Ninasafitri
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Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jrpi.v3i2.38576

Abstract

The East Arm of Sulawesi is an active tectonic zone formed by the collision between the Banggai-Sula microcontinent fragments and the East Sulawesi Ophiolite Complex. This research was conducted in Lamo Village and its surrounding areas, Pagimana District, Banggai Regency, to identify detailed geomorphological, lithostratigraphic, and structural geology characteristics, which currently remain limited. The research methods include field mapping, morphometric analysis using DEMNAS data and structural kinematic analysis using stereographic projection. The results indicate that the geomorphology of the study area is divided into two units: the Structural Hills Unit (slope 2–50%) and the Coastal Plain Unit (slope 0–2%). Lithostratigraphically, the study area consists of a Peridotite Unit covering 23.81 km² and an Alluvial Unit covering 1.83 km². Structural analysis of the Peridotite Unit reveals a high intensity of extension joints with a maximum principal stress (σ1) oriented at 127°/71° (NW–SE).
Co-Authors Abdul Rizal Muladi Ariyanto Pakaya Aulya Tiara Putri Muh Kasim Permana, Aang Panji Yayu Indriati Arifin