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Arif Budiman
Departemen Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Andalas
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Pendugaan Zona Alterasi Hidrotermal Menggunakan Data Geomagnetik EMM 2017 Di Wilayah Lubuk Sikaping Fauzan Surya Nanda; Arif Budiman
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.623-629.2025

Abstract

This study aims to identify hydrothermal alteration zones in Lubuk Sikaping District, Pasaman Regency, West Sumatra, using Enhanced Magnetic Model (EMM) 2017 geomagnetic data developed by the National Oceanic and Atmospheric Administration (NOAA). The data processing stages include International Geomagnetic Referee Field (IGRF) correction, evaluation of regional and residual anomalies using Radial Average Power Spectrum (RAPS), reduction to the poles, analysis of magnetic anomaly values ​​with the geological conditions of the study area. The results show that residual magnetic anomalies are in the range of -7.09582 nT to 7.65333 nT. The results of the analysis of magnetic anomaly values ​​and geological conditions indicate that the high anomaly zone (3.12460 nT - 7.65333 nT) spread in the south and southwest is a mineralization zone. The moderate anomaly zone (0.07503 nT - 3.12460) spread in the central to northeast is a lithology preservation zone between magnetic igneous rocks and non-magnetic sedimentary rocks. The low anomaly zone (–7.09582 nT - 0.07503 nT) located in the north and northeast is a hydrothermal alteration zone. The presence of mineralization zones, lithology boundary zones and hydrothermal alteration zones indicates that there is a fluid migration path in this area. The hydrothermal alteration zone in Lubuk Sikaping District is associated with the Sarik-Gajah Formation which consists of volcanic rocks that have undergone alteration due to the presence of active structures of the Sumatran Fault System.
Identifikasi Potensi Mineral Nikel Laterit Menggunakan Data Geomagnetik EMM (Enchanted Magnetic Model) 2017 di Kecamatan Poli Polia Keisyah Putri Islami; Arif Budiman
Jurnal Fisika Unand Vol 15 No 1 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.1.87-93.2026

Abstract

A study has been conducted utilizing secondary geomagnetic data from the Enhanced Magnetic Model (EMM) 2017. This study aims to identify the potential presence and lateral distribution of laterite nickel minerals in Poli Polia District. The data processing stages include International Geomagnetic Reference Field (IGRF) correction, Reduce to Pole (RTP) transformation, and separation of regional and residual anomalies. Furthermore, analysis and interpretation are carried out by comparing the residual anomaly map to the regional geological map. The results of the RTP transformation obtained residual magnetic anomaly values ​​ranging from -0.8 nT to 0.7 nT with high anomaly values ​​ranging from 0.5 nT to 0.7 nT and low values ​​ranging from -0.8 nT to -0.6 nT. In the southwest of the study area there is a low magnetic anomaly zone surrounded by a low magnetic anomaly zone, while in the north it is the opposite. The results of data interpretation indicate that the high anomaly zone in the southwest is related to the presence of the Ultramafic Complex (Ku) composed of peridotite and serpentine rocks, while the low anomaly zone is interpreted as a prospective area containing laterite nickel minerals. Meanwhile, in the northern part, the low anomaly zone correlates with the Mekongga Complex (Pzm), which is composed of metamorphic and sedimentary rocks. The presence of a high anomaly zone in this area indicates the presence of geological features such as faults or joints that play a significant role in enhancing the local magnetic response.
Identifikasi Potensi Mineralisasi Emas di Kecamatan Sangir menggunakan Data Geomagnetik EMM 2017 Intan Fitri; Arif Budiman
Jurnal Fisika Unand Vol 15 No 1 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.1.79-86.2026

Abstract

Indonesia is a country with significant potential for gold mineral resources, particularly in areas along the Sumatran magmatic belt. This study aims to identify the potential distribution of gold mineralization in Sangir District, South Solok Regency, using secondary geomagnetic data. The data used is the Enhanced Magnetic Model (EMM) 2017 model obtained from the National Oceanic and Atmospheric Administration (NOAA). Data processing was carried out through the stages of IGRF correction, calculation of total magnetic anomalies, separation of regional and residual anomalies and reduction-to-pole transformation (RTP) using Oasis Montaj software. The results show that the residual anomaly after reduction to the pole ranges from -1.0935 to 1.1861 nT. Based on local geological conditions, zones with low magnetic anomalies that develop in the central to western parts of the study area are interpreted as alteration and fracture zones that have the potential to become hydrothermal fluid movement pathways. The zone with moderate to high magnetic anomalies that developed in the eastern, east-central, and southeastern parts of the research area is interpreted as a response from high magnetic rocks associated with sulfide minerals (pyrite) and porphyry systems, so that the zone is identified as a prospective zone that has the potential to contain gold mineralization.
Co-Authors Fauzan Surya Nanda Intan Fitri Keisyah Putri Islami