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All Journal Bulletin of Scientific Contribution : Geology Jambura Geoscience Review
Raharjanti, Ni'matul Azizah
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Environmental Science

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GIS-BASED LANDSLIDE HAZARD ANALYSIS BASED ON WEIGHTED OVERLAY METHOD IN SAMARINDA, EAST KALIMANTAN Raharjanti, Ni'matul Azizah; Sutan, Syamsidar; Ismunandar, Wisnu; Alam, Fajar; Andhika, Muhammad Wira
Bulletin of Scientific Contribution Vol 21, No 3 (2023): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v21i3.51968

Abstract

Samarinda has experienced a frequent landslide disaster, accounting for 30% from the total disaster occurring in 2019. Based on these data, it is necessary to carry out the analysis on the landslide hazard as the mitigation to minimize the damage that may be caused by the landslides. The research was conducted in GIS based processing, by collecting secondary data supported by field observations and quantitative analysis to produce the landslide hazard map. Slope gradient, geology, soil type, and rainfall are the parameters used to determine the landslide susceptibility zonation in the research area. These parameters are then processed using a weighted overlay method. The zoning results show most of Samarinda is included in the intermediate landslide hazard zone, followed by the high landslide hazard zone, and the low landslide hazard zone which has the narrowest distribution. The high landslide hazard zone has a distribution associated with geological structures identified as fold which are included in the Samarinda anticlinorium and thrust fault in north-south direction. The distribution of the landslide hazard zones indicates that the slope gradient, lithology which consist of sedimentary rock, and fold and fault structures, are the main controlling factors for landslides in Samarinda.
Clay Mineral Identification for the Utilization of the Brick Industry in Samarinda using X-Ray Diffraction (XRD) Analysis Raharjanti, Ni'matul Azizah; Ismunandar, Wisnu; Sutan, Syamsidar; Andhika, Muhammad Wira; Priatama, Muhammad Haykal Bayu
Jambura Geoscience Review Vol 6, No 2 (2024): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v6i2.21524

Abstract

The clay minerals occurrences can be utilized into various products, including bricks. Brick industry often used the materials taken from the local area. The objective of the research is to identify the lithology of the brick material as well as the mineral consist in the soil or material, including clay mineral. The analysis is carried out in field observation and X-Ray Diffraction (XRD) analysis. The analysis resulting the lithology of the research area is predominantly sandstone and the bricks material is taken from the clayey soil part of from the quartz sandstone lithology. The quartz sandstone predominantly composed by quartz (97%) and plagioclase as minor mineral (3%). The analysis of the clay soil sample in quartz sandstone layer which used as the main component of the brick showing that the minerals composition are mainly quartz (95%) and plagioclase as minor mineral (3%), while the clay mineral that detected is kaolinite (2%). The formation of the kaolinite is interpreted as the result of the weathering of plagioclase trough hydrolysis process. From those data, it is identified that the brick in the research area mainly composed by quartz and clay mineral as kaolinite is formed in just minor abundance.
Clay Mineral Identification for the Utilization of the Brick Industry in Bukit Raya, Tenggarong Seberang, Kutai Kartanegara Raharjanti, Ni'matul Azizah; Agustina, Fitriyati; Anggraeni, Sarah
Bulletin of Scientific Contribution Vol 22, No 3 (2024): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v22i3.57677

Abstract

Bricks as one of the main components in buildings are often made by clay contained material that supplied from the nearby resources, including in Bukit Raya, Tenggarong Seberang, Kutai Kartanegara. However, the type of clay minerals that utilized for the brick in the research area, is not identified in detailed analysis. The research is conducted to identify the lithology of the brick material as well as the clay mineral that consists in the soil or material. The analysis is carried out through field observation and laboratory analysis which included X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), and X-Ray Fluorescence (XRF) analysis. The analysis resulting the lithology of the research area is predominantly sandstone alternating with claystone and coal intercalation. The XRD analysis on claystone and soil that used for bricks showing that the samples are mainly composed by quartz, with clay minerals identified is kaolinite, montmorillonite, and illite. However, according to the SEM analysis, only kaolinite and montmorillonite that present in the samples. According to the geochemistry of the samples, the average SiO2 content is ranging from 45.8% to 55.50%.  The Fe2O3 content is measured from 2.02% to 5.96% which excess the SNI standard for pottery that set as 0.8 wt.%. CaO component varying from 0.117 to 0.221 wt.%, which still in the allowed value for the pottery materials which set to maximum 1 wt%. 
Co-Authors Alam, Fajar Andhika, Muhammad Wira Anggraeni, Sarah Fitriyati Agustina Priatama, Muhammad Haykal Bayu Sutan, Syamsidar Wisnu Ismunandar