Potential Use of Rock Magnetism Method to Uncover Magnetic Minerals from Rocks in Talamau Segment, West Pasaman, Indonesia

Tasya Sri Ramadhani; Hamdi Rifai; Ahmad Fauzi; Caesario Dipo; Harman Amir; Chairatul Nadia

doi:10.61722/jinu.v3i4.10808

Authors

Tasya Sri Ramadhani Universitas Negeri Padang
Hamdi Rifai Universitas Negeri Padang
Ahmad Fauzi Universitas Negeri Padang
Caesario Dipo Universitas Negeri Padang
Harman Amir Universitas Negeri Padang
Chairatul Nadia Universitas Negeri Padang

DOI:

https://doi.org/10.61722/jinu.v3i4.10808

Keywords:

Talamau segment, active tectonics, magnetic minerals, magnetic susceptibility, rock magnetism method

Abstract

The Talamau segment in West Pasaman Regency is a tectonically active area with a variety of lithologies such as crystalline limestone, volcanic breccia, alluvial deposits, ultramafic rocks, and ancient volcanic coarse alluvium. The tectonic and geological complexity of the region is reinforced by the occurrence of an earthquake with a magnitude of Mw 6.1 on February 25, 2022, which indicates high fault activity and the potential for changes in the physical and magnetic properties of rocks in the region. Identification of magnetic minerals in rocks is very important to understand the impact of tectonic activity on magnetic properties and subsurface mineral distribution, but understanding of the magnetic characteristics of lithologies in the Talamau Segment is still limited. In this regard, there are many mineral identification methods, such as XRF for chemical element composition analysis and XRD for identification of crystalline mineral phases in geological samples. However, in this study, the rock magnetism method was chosen as the main approach due to its effective ability to reveal the distribution and concentration of magnetic minerals in various lithologies. This study aims to analyze the potential of the rock magnetism method, especially through magnetic susceptibility measurements, in revealing the distribution and concentration of magnetic minerals in various lithologies in the Talamau Segment. The study was conducted through a systematic literature review (SLR) on 100 scientific articles (2010-2025) selected based on lithological suitability, magnetic mineral focus, and use of rock magnetism methods. The 12 most relevant articles were analyzed in depth to identify the magnetic characteristics of similar lithologies. Results show that the rock magnetism method is very effective for distinguishing magnetic characteristics between dominant lithologies; crystalline limestones generally have low susceptibility values, while volcanic breccias and ultramafic rocks have higher, indicating the content of ferromagnetic minerals such as magnetite. The advantages of this method include fast, simple, flexible (laboratory/in situ), cost-effective, and relevant measurements for geological applications. This study confirms that the rock magnetism method has great potential as an effective initial tool in geological research and exploration in tectonically active areas such as the Talamau Segment, and can be the basis for understanding the dynamics of geological changes due to tectonic events..

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