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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 2, No 4 (2018): Journal of Geological Sciences and Applied Geology" : 5 Documents clear
Determination of Maximum Unsupported Span and Stand Up Time Value using Q-System Method (Case Study: Pongkor Area, Nanggung Subdistrict, Bogor District, West Java Province) Alisah Alisah; Irvan Sophian; Zufialdy Zakaria; Ryan Pratama; Yusi Firmansyah
Journal of Geological Sciences and Applied Geology Vol 2, No 4 (2018): 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.v4i2.18235

Abstract

Epithermal deposit might be a potential economic mining source. One kind of this deposit is the low-sulphidation epithermal with the quartz vein which can be found in the study area. However, the high intensity number of the alteration process will affect the rock mass quality in the area of interest which also will influence the safety of underground mining process, ecspecially while the tunnel reinforcement is being set. Therefore, maximum unsupported span and stand up time value need to be determined.Study area is Nanggung Subdistrict, Bogor District, West Java Province. This study is conducted at some fronts in Ciguha tunnel, using the Q system methode. After the rock mass has been classified, the maximum unsupported span and stand up time value can be calculated.The result shows that maximum unsupported span value has a variety number from 8 hours to 1 year extend. At the other side, stand up time value also has a variety number from 1 to 4 meters span. Both shows a value depends on their own rock mass quality. Keyword: Q- System, Stand up time, Maximum unsupported span
MORPHOMETRY AND MORPHOTECTONIC OF CIANTEN AND CISAAT WATERSHED ON QUATERNARY VOLCANIC TERRAIN, GARUT, WEST JAVA Sumahang R. Sipahutar; Emi Sukiyah; Nana Sulaksana
Journal of Geological Sciences and Applied Geology Vol 2, No 4 (2018): 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.v4i2.18280

Abstract

The research area is located in the Baluburlimbangan, Garut regency, West Java Province.Geographically, the research area is located at 107° 52' 23.32" E - 107° 59' 30.04" E and 6° 57'28.21" S - 7° 3' 39.23" S. Research object comprise Cianten and Cisaat watershed which will becompared based on morphometric and morphotectonic parameters. Observations carried outdirectly in the field and data analysis carried out in the studio. Research result shows that researcharea can be classified into medium – weak active tectonic area. It is proved by bifurcation ratio(Rb), drainage density (Dd), and sinuosity of mountain front (Smf). Active tectonic condition is alsoindicated by geology structure formed in research area such lineament of ridge and valley, anddrainage pattern.Keywords: Cianten, Cisaat, morphometry, morphotectonic, watershed
THE SINISTRAL STRIKE SLIP FAULT AS AMPANA BASIN CONTROLLER IN CENTRAL SULAWESI Rahmat Yantono Saragih; Iyan Haryanto; Emi Sukiyah; Nisa Nurul Ilmi; Edy Sunardi
Journal of Geological Sciences and Applied Geology Vol 2, No 4 (2018): 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.v4i2.18289

Abstract

The presence of gas seepage born in Tanjungapi precisely in the southwestern part of the basin.This remission is supposed to be formed from main rocks of Mesozoic aged. The condition ofAmpana Basin formation cannot be separated from the effect of the relatively northeast-southeastsinistral strike-slip-fault. Based on the 43 outcrop, the main deformation product was identified asan extensional/hybrid joint with a relatively west-east fault line structure on average shear strain(η) = 58o (+) to (η) = 60o (+) and in form of the relatively northwest-southeast strike-slip-faultstructure line with the range of shear strains value between (η) = 45o (+) to (η) = 54o (+). Thekinematics movement of relatively vertical main stress gives a subsidence impact on the surfaceof Mesozoic-Paleogenic aged rock. The sedimentation process of Neogene-aged clastic, from theBongka Formation, Kingtom Formation, and Lonsio Formation ran fast and make the lowerMesozoic-Paleogene-aged rock being burdened by the upper younger rocks. The tectonicdevelopment in Ampana Basin is recorded in Lonsio Formation, Bongka Formation, and limestonein the form of structural indication and deformation showing the period of Central Miocene toHolocene tectonic with the relatively west-east direction of the main regional stress. Keywords: Ampana basin, deformation, strike slip fault, Sulawesi, Tanjungapi
LITHOLOGIC ORDER MAPPING AND ROCK RESOURCES INVENTORY OF KUTAWARINGIN QUADRANGLE, WEST JAVA Reza Mohammad Ganjar Gani; Yusi Firmansyah; Aji Nurdrajat
Journal of Geological Sciences and Applied Geology Vol 2, No 4 (2018): 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.v4i2.18377

Abstract

In general, the southern part of Bandung is composed of rocks produced by volcanic activity. Research in this region based on the want to understand the geology of volcanoes in Bandung and surrounding areas including the origin of the formation of the Bandung Basin (Bronto & Hartono, 2006). The Bandung basin is almost surrounded by volcanoes; even in the midst there is also volcanic rock (Silitonga, 1973, Alzwar drr., 1992). Information about why and how the area of Bandung to be controlled by volcanic rocks is needed to find out more potential resources as well as geological disasters due to volcanic activity. This study aims to decide the history of volcanism in South Bandung. I want to represent a complex area seen from the diversity of geological and rock environment conditions. This diversity condition controls the landscape and geological conditions observed at this time. The purpose of the preparation of this study is to be used to develop the Stratigraphic order and inventory of minerals.Keywords: Kutawaringin, stratigraphy, resource potential
INTERPRETATION OF GAMMA RAY VALUE BASED ON OUTCROP DATA IN SIMPENAN AREA, REGENCY OF SUKABUMI Yusi Firmansyah; Reza Moh. Ganjar Gani; Aji Nurdrajat
Journal of Geological Sciences and Applied Geology Vol 2, No 4 (2018): 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.v4i2.18234

Abstract

Natural radiation is the radiation that exists in nature in the form of cosmic radiation and the radiation is derived from the radioactive material present in the earth's crust (IAEA, 2003). This radionuclide is present in almost any material such as earth's crust, rocks, soil layers, seawater, building materials and human bodies of different levels. Generally these radiometric traces of an outcrop depend on the original rock that can be seen from petrology. The geological condition of Ciletuh in Sukabumi Regency is quite complex, seen from the structure of rocks, the characteristics of rocks, stratigraphy and also the landscape, thus making the area of Ciletuh interesting enough to serve as the location of research research in the field of Geology. Landslide disaster is one of the most common disasters in Indonesia. Based on data from the National Disaster Management Agency (BNPB) within the period of 2011-2014 there were 493 cases of landslides recorded in Indonesia. The potential of disaster and landslide vulnerability is a threat to the people of the Simpenan area, Sukabumi Regency which has geographical condition that is prone to landslide disaster. The purpose of this research is to know the distribution of Gamma Ray value in exposed rock and to see the relation of Gamma Ray value distribution with landslide prone area in research area. In the field observation, the lithology was 70% dominated by polymic breccia as well as 30% sandstone and claystone. The mean overall gamma ray value in the study area was 0.036 μSv / h. The landslide-prone areas in the study area have high gamma ray values and are located in areas with steep to steep slopes (8-35 °) where the reliefs are controlled by claystone lithology which has high potassium and thorium contents and is susceptible to weathering, erosion and prone to landslides. Keywords: Gamma Ray, landslide, Stratigraphy

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