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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 8 Documents
 1 
Search results for , issue "Vol 4, No 1 (2020): Journal of Geological Science and Applied Geology" : 8 Documents clear
CHARACTERISTICS OF VOLCANIC ROCK CIKOTOK FORMATION AT CIHARA AND SURROUNDING AREA, LEBAK DISTRICT, BANTEN PROVINCE Aton Patonah; Haryadi Permana; Fadhli Alamsyah
Journal of Geological Sciences and Applied Geology Vol 4, No 1 (2020): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i1.29044

Abstract

Volcanic rock of Cikotok Formation in southern part of the Bayah Dome, known as old andesite volcanic, is one of the parent rocks contain gold and base metal mineralization. This study aims to identify in more detail about texture, structure, and composition of mineral constituents of the rock by using field observation and petrographic methods. The result shows that the volcanic rocks of Cikotok Formation were came from shallow eruptions and relatively rapid cooling characterized by trachytic to porphyritic texture, embayment, and amygdaloidal structure. Most of these rocks have altered. These altered rocks are believed related to deformation at Oligo-Miocene that causing the presence of weak zone so that hydrothermal fluid can passes through
STRATIGRAPHIC ANALYSIS : RAJAMANDALA FORMATION AND CITARUM FORMATION BASED ON OUTCROPS DATA Reza Mohamad Ganjar Gani; Yusi Firmansyah; Satrio Fajar Pamengkas
Journal of Geological Sciences and Applied Geology Vol 4, No 1 (2020): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i1.29112

Abstract

The location of study area is in Padalarang, West Java with Rajamandala Formation and Citarum Formation outcrop as observation object. Rajamandala Formation is characterized by shallow marine deposit and carbonate sedimentary rock. Meanwhile, Citarum Formation is identified as deep marine deposit and consists of clastic sedimentary rock. The methods used in this study are fieldwork, laboratory analysis, data interpretation, and stratigraphic analysis. Laboratory analysis consists of petrographic analysis and foraminiferal analysis. The contact between these formations is not identified in study area. Outcrop observation exposes improper data to determine the stratigraphic relation, since covered by debris materials of limestone. Foraminiferal analysis data shows that Rajamandala Formation is formed in Late Oligocene (Lower Te/P20 – P22/N1 – N3) and Citarum Formation is formed in Middle Miocene (N9 – N13). It shows gap of time from N3 until N9. It determines an uncorformity stratigraphic relation between these two formations. The depositional environment changes significantly from shallow marine to deep marine. Study area exposes outcrops data which represent these formations and other additional data needed. It offers a good opportunity to determine the stratigraphic relation between these two formation. Furthermore, it can be used as analogue in determining stratigraphic relation.
SOIL BEARING CAPACITY OF SHALLOW FOUNDATION BASED ON TERZAGHI METHOD IN CIPATAT, WEST BANDUNG, WEST JAVA Kintan Adelia Arum Wicaksana; Zufialdi Zakaria; Dicky Muslim; Nur Khoirullah
Journal of Geological Sciences and Applied Geology Vol 4, No 1 (2020): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i1.28998

Abstract

Infrastructure development is a common thing that happened in Indonesia, especially house construction that happened in Cipatat, West Bandung, West Java. One of the important things in construction is a foundation and one of the foundation’s types is a shallow foundation. Soil bearing capacity is one of several things that used to calculate foundation planning. This research is using the Terzaghi method for soil bearing capacity. The data was obtained by taking the disturbed sample from three different locations. Those samples were tested in a laboratory, the test is a direct shear test to know about soil bearing capacity's value. The result is soil bearing capacity value range between 5.47 ton/m2 - 26.52 ton/m2. That value for soil bearing capacity is categorized as low.
THE BANDUNG CITY SPATIAL PLANNING POLICIES IN GEOLOGICAL PERSPECTIVE Emi Sukiyah; Nur Khoirullah
Journal of Geological Sciences and Applied Geology Vol 4, No 1 (2020): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i1.29147

Abstract

The Bandung city has an advantageous position, both from geographical, geological, political, and strategic aspects. The location of Bandung city, which is in the highlands, is famous for its cool weather. Since the colonial era of the Dutch East Indies, Bandung City has been the center of government and research in the field of geology. One piece of evidence that is still well preserved is the Geology Museum. Even the impression of geology is still strong with the many government institutions in the field of geological development in this city. The aspect of natural resources, including geology, is also the main asset to organize the Bandung city. The volcanic products that underlie this city become a fertile land for agriculture and the mining industry for construction and industrial materials. Several rivers also flow in this area. The hilly panorama with the post-volcanism phenomenon is an attraction for developers in the tourism sector. The groundwater potential is also abundant. The development of Bandung City does not mean that there are no obstacles. The significant increase in population has earned this city the nickname of the most populous city in West Java. If the city government cannot control the increase in the population density, it is not impossible that this city will be a city that does not have the appeal again. In fact, now the impact is already being felt, traffic jams, floods, waste, etc. Bandung city spatial planning should be carried out in an integrated manner, involving historical, geological, geographic, socio-cultural, political, and strategic aspects.
EFFECT OF BEDDING PLANES ON SLOPE STABILITY IN COAL OPEN MINE PT. PAMAPERSADA NUSANTARA DISTRICT ASMI, CENTRAL KALIMANTAN Faisal Akbar; Raden Irvan Sophian; Dicky Muslim; Sahala Manullang
Journal of Geological Sciences and Applied Geology Vol 4, No 1 (2020): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i1.29069

Abstract

Bedding planes are one of the distinctive features of an open coal mine. The presence of the bedding planes can be a slip surface on a slope that has a dip direction relatively in the same direction as the bedding planes. Kinematic analysis for open pit slopes is one important aspect of the influence of the bedding planes in minimizing the occurrence of landslides. The purpose of this research is to explain the effect of the presence of bedding planes on slope stability. The method used is secondary data collection, field observations, and kinematic analysis. The results showed that the slopes of the study area were composed of sandstone, claystone, siltstone, carbonaceous claystone, and coal. Carbonanaceous claystone as a weakly layer. The rock bedding area on this slope has a strike/dip N 288 ° E / 17 °, while the slope of the research has an overall slope 29 ° and a slope dip direction N 15 ° E. The dip direction value that is relatively unidirectional between the bedding planes and the slope of the research with a difference of 3 ° can be the cause of the slip surface and is prone to landslides. Thus, the slopes of the study area have the potential plane failure so that geotechnical engineering is needed in the next mining process to ensure slope stability.
Stratigraphy and structural pattern of Kebumen Region using Second Vertical Derivative of Gravity Data, Central Java Syaiful Alam
Journal of Geological Sciences and Applied Geology Vol 4, No 1 (2020): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i1.29018

Abstract

Gravity forward modeling has been carried out in Kebumen Region, Central Java Province. With its position on the mélange complex, the geological complexity in this area is still a challenge to be modeled. Bougeur anomaly values in the study area ranged from 50 mGal to 130 mGal. The structural morphology of the Luk-Ulo Mélange Complex and Kulon Progo Mountain have higher Bougeur anomaly, ranging from 105 to 125 mGal. The residual positive anomaly zones in the northwest and southeast are situated with residual negative anomaly zones in between. The shallow effect through the Second Vertical Derivative method shows the patterns of fault types separating the two anomalous zones of Karangsambung and Kulon Progo region. The Luk Ulo Mélange Complex and stratigraphy of Karangsambung Formation up to Halang Formation are faulted by thrust-fault and strike-slip structural pattern. Keyword: Stratigraphy, structural pattern, second vertical derivative.
THE LEVELS OF LEMBANG FAULT ACTIVITY BASED ON GEOMORPHIC INDEXES ON AROUND THE CIKAPUNDUNG WATERSHED, WEST JAVA Lola Lintang Syalsabilla; Iyan Haryanto; Emi Sukiyah
Journal of Geological Sciences and Applied Geology Vol 4, No 1 (2020): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i1.28518

Abstract

Lembang Fault is a fault in the highlands of Bandung, which has an East-West direction with a length of about 29 km. This fault greatly affects the landscape around the Cikapundung watershed, especially in the upstream. An analysis performed using the geomorphic index; Basin Shape, Mount Front Sinuosity, Asymmetry Factor, T – Index, Ratio of Valley Floor Width to Valley Height, and Relative Tectonic Activity. Based on the analysis using methods above, the level of tectonic in the Cikapundung watershed ranges from active to low. The presence of Lembang fault affects landscape, forming zone that borders the Bandung highlands and the Subang area in the north.
PRELIMINARY SLOPE MAPPING IN CINTARATU VILLAGE, PANGANDARAN, WEST JAVA Bambang Hermanto; Pringgo Kusuma Dwi Noor Yadi Putra; Nur Khoirullah
Journal of Geological Sciences and Applied Geology Vol 4, No 1 (2020): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i1.29122

Abstract

The shape of a landscape is the result of geological processes in the past as well as human processes at this time. Slope mapping is one way of identifying hazards based on current landforms. Cintaratu Village area is an area that has a unique landscape condition because it has a lot of clastic limestone as a result of the karstification process millions of years ago and is currently experiencing significant developments in infrastructure development. This study aims to see the state of the slope around Cintaratu Village. This research uses a qualitative method that will be described as descriptively. Based on the results, several areas have very steep slopes form by clastic limestones and soils. The mean slope varies from 30° to 90° with a height of up to 30 m.

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