Analysis of magnetic properties rocks and soils around the Danau Diatas, West Sumatra

Fajri, R N; Putra, Rizaldi; Maisonneuve, C. Bouvet de; Fauzi, Ahmad; Yohandri, -; Rifai, Hamdi

doi:10.1088/1742-6596/1185/1/012024

Cited by 11 publications

(8 citation statements)

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“…The low value of magnetic susceptibility is caused by wear and tear processes mixed with diamagnetic organic matter [12,13]. Meanwhile, high susceptibility value leads to absence of magnetic mineral content in sample process of transporting minerals [14][15][16].…”

Section: Resultsmentioning

confidence: 99%

Distribution of Pyroclastic Deposits around Lake Maninjau Agam District, West Sumatera, Indonesia based on Magnetic Susceptibility

et al. 2022

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Lake Maninjau is an erupting volcano in West Sumatra Province. The results of the eruption have now settled in various places and scattered in all directions due to the transportation process. The process of transporting volcanic material is caused by several factors such as wind and rain. This study aims to analyze the distribution pattern of volcanic material that is scattered around Lake Maninjau, Agam Regency. We have 25 types of samples divided into 3 categories. There are pumice, lava, and ash. This research was conducted at the FMIPA UNP Laboratory using the rock magnetization method. In this study, a Bartington MS2 with MS2B sensor was used by calculating the magnetic susceptibility value based on the mass of the sample. The results of the magnetic susceptibility analysis obtained varied between 74.7×10-8 - 3956.7×10-8 m3/kg which is included in the ilmenite (FeTiO3) group. The highest value of vulnerability was 2800×10-8 - 4000×10-8 m3/kg found at the core of Lake Maninjau ± 5.0 km seen from the green contour map. The lowest magnetic susceptibility values 0 - 800×10-8 m3/kg were found in the western part of Lake Maninjau and the material was deposited at a distance of ± 13 km from the core of the Maninjau caldera. Deposits were also found in the eastern part of Lake Maninjau ± 22.4 km from the core of Lake Maninjau and to the Middle East ± 23 miles from the core of the Maninjau caldera. The white color represents 1600 - 2000×10-8 m3/kg which is included in the moderate magnetic susceptibility value, which is ± 4 km to the southeast of the Maninjau caldera. The benefit that can be taken from this research in the ink industry is the presence of a magnetic mineral distribution map based on suseptibility values and makes it easier to find raw materials for making ink around Lake Maninjau. HIGHLIGHTS Lake Maninjau stores various elements contained in the released material. The elements that make up magnetic minerals are Fe, Si, Ca, Al, K, Ti. The collection of several elements forms the raw magnetic mineral Volcanic material contains the mineral ilmenite which in theory can be used as a raw material for making TiO2 pigments, ferrous metals and chemical compounds containing iron. In the industrial field TiO2 is widely used as a paint pigment, additives in the paper-making process, ceramic raw materials, pharmaceutical industry raw materials and TiO2 is also widely used for photoclinic materials Superparamagnetic minerals are present in volcanic rock samples resulting from an eruption, the magnetic sensibility values at high frequencies are slightly lower than the magnetic susceptibility values at low frequencies. If there are no superparamagnetic minerals (SP) It can be assumed that the ancient volcanic eruptions of Maninjau belong to the type of plinia eruption which is highly exposed from magma with high viscosity or acid magma, the composition of the magma is andesitic to rhyolitic GRAPHICAL ABSTRACT

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Section: Resultsmentioning

confidence: 99%

Distribution of Pyroclastic Deposits around Lake Maninjau Agam District, West Sumatera, Indonesia based on Magnetic Susceptibility

et al. 2022

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“…The first step is to weigh the sample as much as 100 g and extract it using a strong magnet. The extraction results from strong magnets are then extracted again using weak magnets [5][6] [7]. The results of the extract are put into a new holder and given a name.…”

Section: Sample Measurementmentioning

confidence: 99%

“…Semen Padang is one of the companies located in the Padang area that uses 2% magnetic minerals from iron sand [1]. Measurement of cement with a holder mass of 4.39 g by naming samples [7] sm1, sm2, sm3, and sm4. Measurements with Digital Balance get the mass of cement in Table 1.…”

Section: Datamentioning

confidence: 99%

“…Measurements were carried out 3 times for each sample in a state low field and three times in a state high field so that the average magnetic susceptibility value (obtained χ average) was. The ratio measurements in both frequency is recorded as the value of frequency dependent susceptibility (χfd) [7] which is defined:…”

Section: Table 3 the Value Of Cement Susceptibilitymentioning

confidence: 99%

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Magnetic Susceptibility Properties of Portland Cement

Ningsih

Rifai²,

Dwiridal³

2022

J. Phys.: Conf. Ser.

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The raw materials for making cement consist of raw materials and auxiliary materials where the raw materials consist of Limestone (CaO) (± 80 %), Silica (SiO2) (± 10 %), Clay (Al2O3) (± 8 %), and Iron Sand (Fe2O3) (± 2%) while the auxiliary materials consist of Gypsum (Ca(SO4).2H2O), Pozzolan and Limestone (High Grade). The purpose of this study was to analyze the mineral content contained in iron sand (Fe2O3) used in cement mixtures. To see the mineral content in this cement, can use the magnetic method, one of which is the susceptibility method which is also assisted by the extraction method on cement to purify the iron sand contained in the cement later. The tool used is a Magnetic susceptibility meter type MS2B and extracted using strong and weak magnets 10 times. The extraction results with weak and strong magnets were obtained from 0.011759 gr to 0.35648 gr from 100 gr cement. Sensitivity test was carried out on cement samples with values ranging from 41.27 x 10-8 m3/kg to 44.2 x 10-8 m3/kg.

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“…Minerals in lake sediments can come from the deposition of volcanic ash from the atmosphere [12], river flow that empties into lakes [13], minerals from human activities [14], and autogenic processes [6]. Magnetic minerals have properties including diamagnetic, paramagnetic, ferromagnetic, and ferrimagnetic [15], [16]. The magnetic properties of a rock depend on the magnetic mineral carrying its magnetic properties, i.e.…”

Section: Introductionmentioning

confidence: 99%

Identification of Elemental Composition and Heavy Metal Content in Maninjau Lake Sediment Using X-Ray Fluorescence (MNJ 18-41B)

Akmal

Rifai

Syafriani

et al. 2021

JPSE

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Maninjau Lake is a caldera lake located in Agam, West Sumatra. This lake was formed from the volcanic activity of Mount Maninjau Purba about 60,000 years ago. The volcanic material resulting from the eruption is scattered and deposited in various places, one of which is in lake sediments. Volcanic ash contains various types of elements, including heavy metal elements. This study aims to determine the composition and content of heavy metal in the sediments of Maninjau Lake. The sample analyzed was MNJ 18-41B with a core length of 440 mm, focusing on specimens 148 mm and 376 mm. The selection is a specimen based on the magnetic susceptibility value obtained from the measurement meter susceptibility of the MS2E. Specimen 148 has a value susceptibility low of 2.1 × 10-8 m3/kg, while the 376 specimens have the highest value of susceptibility, the highest 141 × 10-8 m3/kg. The content of sediment elements was determined using the results of X-Ray Fluorescence (XRF) measurements. The measurement results showed that the mineral-forming elements in the sediments of Lake Maninjau were dominated by Si, Fe, Rh, and Zr. In contrast, the highest heavy metal elements are Mn, Fe, Sr, and Rh. Based on the elemental composition and mineral oxide compounds in the sediments of Lake Maninjau derived from volcanic ash.

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Analysis of magnetic properties rocks and soils around the Danau Diatas, West Sumatra

Cited by 11 publications

References 1 publication

Distribution of Pyroclastic Deposits around Lake Maninjau Agam District, West Sumatera, Indonesia based on Magnetic Susceptibility

Distribution of Pyroclastic Deposits around Lake Maninjau Agam District, West Sumatera, Indonesia based on Magnetic Susceptibility

Magnetic Susceptibility Properties of Portland Cement

Identification of Elemental Composition and Heavy Metal Content in Maninjau Lake Sediment Using X-Ray Fluorescence (MNJ 18-41B)

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