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INDONESIA
Journal of Geosciences and Applied Geology
Published by Universitas Padjadjaran
ISSN : 25793136     EISSN : 25793136     DOI : https://doi.org/10.24198/gsag.v7i3
Core Subject : Science, Engineering,
Earth & Planetary Sciences Engineering
Journal of Geological Sciences and Applied Geology (GSAG) is a National multidisiplinary Journal focus on Geological Sciences, Applied Geology, and Geological Engineering and Earth Science. Our Mission is to publish research related to (but not limited) Geology Petrology Paleontology Stratigraphy Sedimentology Remote Sensing Geomorphology GIS Engineering Geology Geotechnics Geochemistry Geophysics Geological Hazard and Disaster Geopark Hazard Mitigation Geography Earth Sciences
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 5 Documents
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Search results for , issue "Vol 3, No 2 (2019): Journal of Geological Sciences and Applied Geology" : 5 Documents clear
CHARACTERISTICS OF MINERAL ALTERATION ZONES IN KADIDIA GEOTHERMAL FIELD, SIGI DISTRICT, CENTRAL SULAWESI PROVINCE Danella Rachmatika; Agus Didit Haryanto; Johanes Hutabarat; Dudi Hermawan; Santia Ardi Mustofa
Journal of Geological Sciences and Applied Geology Vol 3, No 2 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i2.22459

Abstract

Kadidia geothermal area is located in Sigi Regency, Central Sulawesi Province. The survey area is about 57.1 km from the city of Palu and about 41.9 km from the capital city of Sigi Regency, Sigi Biromaru. The purpose of this research is to determine the characteristics of hydrothermal alteration in the research well. The method used is petrological analysis on KDD-1 well core data starting from the depth of 44,3 m – 703,85 m, petrographic analysis on 17 rock samples and Specterra analysis based on secondary data. The alteration minerals that appeared in research wells include chlorite, calcite, sericite, secondary quartz, iron oxide, opaque minerals and clay minerals with alteration types in the form of replacement and direct depositional. Based on the presence of minerals and determination of alteration zones, obtained Chlorite-Calcite-Illite-Smectite zone, which is characterized by the presence of chlorite, calcite, smectite, sericite alteration minerals at a depth of ± 12.7 m to ± 599 m. At depth of ± 599 to ± 703 m, alteration minerals that appear include chlorite, calcite, illite-smectite which are more dominant. Furthermore, it also found the presence of secondary quartz minerals that fill vugs, sericite and iron oxides with a rare intensity. This zone includes in the argillic zone with a temperature of 140°C - 220°C. It was concluded that the alteration rocks in KDD-1 wells are estimated as caprock zones of the Geothermal Kadidia system, which are formed because of the interaction between rocks and acidic fluid to low acid.
THE MORPHOTECTONIC CHARACTERISTIC OF BUOL WATERSHED AND IMPLICATION TO SPATIAL PLANNING IN BUOL REGION, CENTRAL SULAWESI, INDONESIA Sukardan Tawil; Emi Sukiyah; Mega Fatimah Rosana; Dicky Muslim; Pradnya Paramarta Raditya Rendra
Journal of Geological Sciences and Applied Geology Vol 3, No 2 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i2.23081

Abstract

The Buol watershed is located on the northern arm of Sulawesi Island. Geomorphology in this region is controlled by developing faults. Geomorphological analysis is done to obtain objective results. Geomorphological variables can explain significantly the geomorphic process itself. The studio, field and laboratory methods is used in this research. Studio analysis consists of topographical map, satellite imagery, Ratio of valley Floor Width to Valley Height (Vf), Mountain Front Sinuosity (Smf), Drainage density (Dd), and Bifurcation Ratio (Rb) analysis. Also, statistical test is used to determine the relationship between these variables. Research area in watershed Buol has landform, namely lowland, low hills, hills, and high hill. Drainage pattern that developed namely anastomotic, sub-dentritic, sub-parallel, trellis, and sub-trellis drainage pattern. The results of the watershed morphometry analysis show calculation of the average value of Rb is 1.48 to 6.24, value of Dd average from 1.17 to 2.45., Smf value ranged from 1.6 to 1.76 and Vf ratio range from 0.5 to 1. That phenomenon shows that the Buol watershed is controlled by tectonic.
GEOLOGY OF SILIHWANGI AREA, MAJALENGKA DISTRICT, WEST JAVA PROVINCE PRADNYA PARAMARTA RADITYA RENDRA; Emi Sukiyah
Journal of Geological Sciences and Applied Geology Vol 3, No 2 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i2.23094

Abstract

Silihwangi area is located in Majalengka District, West Java Province with coordinate 108°13’22” E - 108°16’5” E and 6°57’41” S - 7°0’22” S. This research aims to identifiy and know the geology of Silihwangi area and its surrounding. This research used digital maps to carried out processing step in studio and field equipment such as GPS, camera, compass, geological hammer, etc to carried out field observation. Some rock samples are taken for further analysis. Based on field observation and studio analysis, the research area can be divided into five morphology unit namely very gentle sloping hill, gentle sloping hill, rather steep hill, steep hill, and very steep hill morphology unit. Other than that, there are subparalel, radial, and subdendritic drainage pattern that can be found in the research area. The lithostratigraphic units in the research area, namely Sandstone (Tmbp), Claystone (Tpbl), Andesite intrusion (Ki), Tuff (Kt), and Volcanic breccia (Kbv) unit. Joint and lithology offset can be found in the research area.
Slope Stability Analysis on Muaraenim Formation, South Sumatera, Indonesia Thaha Rizal Ulhaque; Nur Khoirullah; Raden Irvan Sophian; Zufialdi Zakaria
Journal of Geological Sciences and Applied Geology Vol 3, No 2 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i2.23206

Abstract

Slope stability analysis is a necessary aspect in open mining operations. The research location is in the Muaraenim Formation, South Sumatra, Indonesia. In this study, the level of slope stability is determined by the value of the Safety Factor (FS). The method used is limit equilibrium, the Spencer method. The results of this study indicate that FS values are influenced by the angle of the slope, where with decreasing degree of slope, the FS value will increase. In addition, the FS value is also directly proportional to the cohesion value of the slope materials.
ZONE OF GEOTHERMAL PROSPECTS BASED ON FAULT FRACTURE DENSITY (FFD) METHOD IN SUMANI REGION, WEST SUMATERA Resni Sasilani; Agus Didit Haryanto; Johanes Hutabarat; Dudi Hermawan; Sri Widodo
Journal of Geological Sciences and Applied Geology Vol 3, No 2 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i2.22270

Abstract

The presence of geothermal manifestations in the form of hot springs is closely related to the presence of permeability zones in the Sumani geothermal system, West Sumatra. The permeable zone allows fluid circulation where meteoric water seeps to fill the reservoir and emerges on the earth's surface as a manifestation of hot springs. This study aimed to identify those permeable zones based on lineament density analysis using the Fault Fracture Density (FFD) method on ASTER GDEM satellite imagery. Lineaments in this case was assumed to be associated with fractures or faults in geothermal areas. The method was used to analyze the presence of lineament on topographic maps and to clarify all lineaments in the study area by adjusting the irradiation angle of 0°, 225°, 270°, and 315° at a constant altitude of 45°. From the FFD method, high lineament density values were found in the southwest of the study sites. The pattern of lineaments in the research area had northwest - southeast and southwest – northeast. The FFD analysis results were compiled with location of geothermal manifestations and geomorphological analysis which then showed positive results on the emergence of dominant hot springs depending on zones with high lineaments density and was located in the pyroclastic flow geomorphology unit with a difference in elevation between 500-1500 masl and slope of moderately steep to steep; indicating catchment area. Further research was needed to accurately understand about reservoir and the potential of geothermal reserves in the Sumani area.Keywords: Sumani Geothermal System, Fault Fracture Density, Geomorphological Analysis.

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