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All Journal Bulletin of Scientific Contribution : Geology Journal of Geosciences and Applied Geology
Yusi Firmansyah, Yusi
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science

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COAL SEAM ANALYSIS WEST BATURAJA SUB-DISRICT, SOUTH SUMATERA Ganjar Gani, Reza Mohammad; Firmansyah, Yusi
Journal of Geological Sciences and Applied Geology Vol 2, No 5 (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.v2i5.20244

Abstract

Sumatera island is located between 3 NH to 6 SH and 96 EL to 106 EL, along 1,700 km northernto the South, parallel to the subduction zone between the Sunda plate and Indian Oceanic plate onthe western part of Sumatera Island. The western part of Sumatera Island is a fore deep basin.Parallel to it is the Bukit Barisan chain. Towards the eastern part, there is the foreland basin ofNeogen. At the central zone of Bukit Barisan chain, there is the in-between basin. The SouthSumatera Basin starts from the eastern part of Bukit Barisan stretching to the south-east of theocean and adjoining to the basin at the boundary of Bukit Barisan in the south-west and tertiarySunda Basin in the south-east. Coal at the basin or on this formation with low rank is generallylignite. It is only at the young andesite intrusion (at Bukit Asam) where this lignite is altered to behigh rank coal. On this formation coal is divided into three groups, namely, upper part (6 – 7 seams),central part, and lower part (8 – 10 seam). The coal development is mainly autochthon, in the forestenvironment where there is no indication of the existence of swamp vegetation element. Based onthe data, it can be concluded that coal resource at the survey location has quite good quality, withmoderate calorific value and low sulphuric content. Thus, it can be classified into the ‘brown coal’.
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; Sophian, Irvan; Zakaria, Zufialdy; Pratama, Ryan; Firmansyah, Yusi
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
STRATIGRAPHY AND PETROGRAPHY OF ROCKS IN KARANGTENGAH VILLAGE AND SURROUNDINGS, BABAKAN MADANG SUB-DISTRICT, BOGOR DISTRICT, WEST JAVA PROVINCE GANI, REZA MOHAMMAD GANJAR; Firmansyah, Yusi; Putri, Nisrina Nadellia; Efendi, Tri Septianto; Fachrudin, Kurnia Arfiansyah
Journal of Geological Sciences and Applied Geology Vol 7, No 3 (2023): 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.v7i3.53012

Abstract

Stratigraphy and petrography, integral components of geological science, are crucial for identifying mineral composition, rock texture, and characteristics, as well as understanding relationships between layers and layer positions. This study is located in Karangtengah Village and its Nearby Surroundings, Babakan Madang District, Bogor Regency, West Java Province. Physiographically, the study area is included in the Bogor Zone (Van Bemmelen, 1949). The research site is also incorporated in the Geological Map of Bogor Sheet, West Java. And specifically this research was conducted in the Cileungsi River. This river is included in the Jatiluhur Formation (Sudjatmiko, 1972). Stating the purpose of geological mapping, such as understanding regional geology, identifying mineral resources, or assessing geological hazards. Then, data collection in the field, such as conducting detailed field surveys to observe and record geological features, using field notebooks, GPS for plotting, and cameras for documentation, collecting rock samples for laboratory analysis (Petrography analysis and microfossil analysis). As a result of this study, there are four rock units in the Karangtengah area, with the order of formation from the oldest to the youngest. Firstly, Claystone Unit (Tmbl) consists of mudstones and sandstones, with fossils of P. transitoria and G. peripheroronda indicating an Early Miocene age (N8) and the depositional environment is the Outer Neritic. Second, the Old Andesite Intrusion (At) consists of andesite igneous rocks with Middle Miocene age and deposited in a terrestrial environment. Third, the Tuff Unit (Qt) is dominated by pyroclastic tuff rocks with Pleistocene age and deposited in a terrestrial environment. Finally, the Andesite Unit (Am) consists of andesite igneous rocks younger than the Pleistocene, penetrating the Tuff Unit (Qt) and the Claystone Unit, and deposited in a terrestrial environment.
STRATIGRAPHIC ANALYSIS : RAJAMANDALA FORMATION AND CITARUM FORMATION BASED ON OUTCROPS DATA Gani, Reza Mohamad Ganjar; Firmansyah, Yusi; Pamengkas, Satrio Fajar
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.
POTENCY OF SOIL WATER IN MASINAM ISLAND BASED ON THE ROCK RESISTIVITY VALUE Firmansyah, Yusi; Restu, Abigail; Suganda, Bombom Rachmat; Dwi Hadian, Mohammad Sapari; Ganjar Gani, Reza Mohammad
Journal of Geological Sciences and Applied Geology Vol 2, No 5 (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.v2i5.20241

Abstract

Groundwater is water that is contained in soil layers or rocks that are located below the soilsurface. The resistivity or geoelectric method is used to obtain an anomaly of material under thesurface using electrical properties. 2 Dimensional Geoelectric Measurements are carried out asmany as 5 Tracks. From the results of the analysis based on surface data, the resistivitydistribution value in the study area can be interpreted to obtain 3 rock packages with low, mediumand high types of resistance. If it has low resistance (smaller than 45 Ωm), the lithology in thispackage is claystone, this layer is interpreted as not being able to store water and tends to easilyescape the water. While the value of the medium type of resistance (45 μm to 200 Ωm) has goodporosity. The lithology of this package is interpreted as sandstone. Lithology at high resistivityvalues (greater than 200 Ωm), is interpreted as limestone. This limestone layer is presumed tohave undergone a karstification process and presumably, this layer has the potential to be a goodaquifer that can accommodate enough water and drain at a certain time.
SOIL SLOPE REINFORCEMENT USING CANTILEVER RETAINING WALL ON THE WEST RING ROAD OF SADAWARNA DAM, SUBANG DISTRICT Rizki, Afdal; Alam, Boy Yoseph Cahya Sunan Sakti Syah; Khoirullah, Nur; Sophian, Raden Irvan; Firmansyah, Yusi
Journal of Geological Sciences and Applied Geology Vol 7, No 3 (2023): 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.v7i3.50433

Abstract

The research was conducted in the West Ring Road of Sadawarna Dam, Subang Regency. This research aims to provide recommendations for the design of cantilever retaining wall to increase the value of the slope safety factor in the research area. Calculation of the value of the slope safety factor uses the limit equilibrium method with the Janbu calculation method. In actual conditions, the value of the slope safety factor shows an unstable value referring to SNI 8460:2017, namely in static conditions with a vehicle load is 1.31 and in pseudostatic conditions with a vehicle load is 1.083. Slope strengthening was carried out using cantilever retaining wall. The retaining wall design that has been made meets the criteria for stability against overturning, stability against sliding, and stability for the bearing capacity of the soil. The safety factor value for slope with retaining wall shows a stable FS value referring to SNI 8460:2017, namely 1.53 in static conditions with vehicle loads and 1.11 in pseudostatic conditions with vehicle loads. Keyword: slope, safety factor, retaining wall, cantilever
Estimation of Shale Content Calculation using log data in Kutai Basin Firmansyah, Yusi; Rafie, Muhammad; Ganjar Gaji, Reza Mohammad
Journal of Geological Sciences and Applied Geology Vol 7, No 1 (2023): 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.v7i1.49332

Abstract

Log data from the study area is located in the Kutai Basin, precisely in the Pulubalang Formation which is used to calculate the estimated shale content. Shale content estimation is one of the petrophysical parameters. In this study, the calculation of shale content estimation uses 3 methods, namely linear, Clavier and Stieber methods. The results of the calculation will provide the volume value of shale in the research area. In the process of calculating the shale content is calculated by separating the range of zones that will be calculated after determining the shale baseline by positioning the zone line on the highest gamma ray log and sand baseline on the lowest gamma ray which then shows the shale content contained in the zone to be analyzed. The results of the calculation of shale content in well A at a depth of 2750 - 3224 m ranged from 36.57% to 71.99%. The results of the analysis of clay content in the study area have an average clay content of 49.22%, meaning that the more clay content, the smaller the permeability and resistivity values will be and will increase the water saturation value.
Lithology Units Padaherang Area and Surrounding, Ciamis District, West Java Province Gani, Reza Mohammad Ganjar; Firmansyah, Yusi
Journal of Geological Sciences and Applied Geology Vol 5, No 2 (2021): 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.v5i2.35035

Abstract

Administratively, Padaherang region and surrounding is included to kecamatan Padaherang, Ciamis Regency, West Java. The reason why this area is a research area is partly because the author feels that the area in Ciamis Regency is a southern mountainous area that is influenced by volcanism and sedimentation processes and other geological processes. In addition, there are still many geological problems that have not been fully revealed, so the author feels the need to conduct further and more detailed research. Objects to be studied in the field include rocks (description, sampling, direction of moves and slopes), indications of geological structures, and landscape appearances accompanied by sketch photos and additional data deemed to support the research results, The research steps carried out included several stages of work, namely the preparation stage, field work, laboratory research, and the stage of preparing reports. The trajectory that is traced in the field research that has been determined at the preparatory stage. If the trajectory is deemed inadequate, a search for additional trajectories is carried out. There are three methods used in geological mapping, namely the field orientation method, the compass trajectory method, the measuring tape method and the compass. In this mapping, the methods used are the field orientation method and the measuring tape and compass method. Threre are  five lithology units which is arrange at research area, these units of lithologi from the older to the younger is breccias unit, sandstone units,  claystone. Geology activity at research area predicted begun at Oligocen till Holocen era. first in Oligocen the volcanic activity is strong enough where the eruption produced the breccia and sandstone unit, this process stop at lower Miosen. And at the middle Miosen there is the tectonic activity hapenned. Limestone unit was diendapkan at middle Miocen, and claystone unit at upper Miocen, and quartery deposit is the younger unit at research area
DEPOSITIONAL ENVIROMENT CARBONATES SANDSTONE UNIT OF THE NYALINDUNG FORMATION BASED ON OUTCROP DATA Firmansyah, Yusi; Ganjar Gani, Reza Mohammad; Fachrudin, Kurnia Arfiansyah
Journal of Geological Sciences and Applied Geology Vol 2, No 3 (2017): 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.v2i3.15754

Abstract

The research area is located in Loji Village, Simpenan District, Sukabumi Regency, West Java Province. The research was conducted by geological mapping method. The determination of the carbonaceous rocks precipitation environment based on the characteristics of lithology and fossil analysis. Based on the characteristics of lithology, this unit consists of carbonate sandstones. In megaskopis unit of this Carbonate Sandstone has physical characteristics, brown, medium grain sand size - very fine sand, circular round, open pack - closed, good sorting and bad permeability. The results of fossil foraminifera bentonic and plantonic analysis show that the bathymetry zone is at the outer center of neritik So it can be predicted that the deposition environment of this unit is in shallow sea.Keywords : lithologic characteristics, bentonic foraminifera, depositional environment
ANALYSIS OF GEOMORPHOLOGICAL ASPECTS OF SURADE SUB-DISTRICT, SUKABUMI DISTRICT, WEST JAVA Firmansyah, Yusi; Khoirullah, Nur; Fahrul Yahya, Moh
Journal of Geological Sciences and Applied Geology Vol 7, No 1 (2023): 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.v7i1.49334

Abstract

The current form of the earth's surface romance is the result of geological processes that have taken place during the geological period which can show how the characteristics and distribution of the constituent rocks. This research was conducted to find out how the geomorphological conditions by analyzing the aspects of morphography, morphometry, and morphogenetics as a form of geomorphology in an area. The research location is in Mekarjaya Village, Ciemas Sub-district, Sukabumi Regency, West Java, which has geomorphological conditions influenced by the activity of an old submarine volcano which was then uplifted and experienced an intensive tectonic process. The method used in this study combines qualitative and quantitative aspects supported by satellite imagery, data processing applications, and references from previous research results. The results of this study show that there are 2 geomorphological units, namely the Slightly Steep Volcanic Hills Unit and the Steep Volcanic Hills Unit with the distribution of andesitic lava and volcanic breccia rocks. The drainage pattern that develops is rectangular.
Co-Authors Abdurrokhim, . Adycipta Anis Prawoto, Adycipta Anis Adycipta, Adycipta Alam, Boy Yoseph Cahya Sunan Sakti Syah Alisah, Alisah Alpionisa, Salsabila Nur Arbi, Hafsanjani Bombom Rachmat Suganda, Bombom Rachmat DEWI, VISKA TRIARAMINTA Dhehave Riaviandhi, Dhehave Djadjang Jedi Setiadi Dwi Hadian, Mohammad Sapari Edy Sunardi Efendi, Tri Septanto Efendi, Tri Septianto Fachrudin, Kurnia Arfiansyah Fahrul Yahya, Moh Fathin, Muhammad Kayis Febriwan Mohamad, Febriwan Febriwan Mohammad, Febriwan Fenry Simorangkir, Fenry Gani, Reza Mohamad Ganjar GANI, REZA MOHAMMAD GANJAR Ganjar Gaji, Reza Mohammad Ganjar Gani, Reza Moh Ganjar Gani, Reza Moh. Ganjar Gani, Reza Mohammad Irvan Sophian, Irvan Iyan Haryanto, Iyan Khoirullah, Nur Kurnia Arfiansyah, Kurnia Kurniawan, Endy Muhammad Kurniawan Alfadli Nanda Natasia Nurdeani, Rifky Nurdrajat Nurdrajat Nurdrajat, Aji Pamengkas, Satrio Fajar Prasetio, Rio Akmal Rizky Putra, Rafino Kurnia Putri, Nisrina Nadellia Raden Irvan Sophian, Raden Irvan Rafie, Muhammad Restu, Abigail Reza Muhammad Ganjar Gani, Reza Muhammad Ganjar Rizki, Afdal Rodhiya, Azzam Robbi Ryan Pratama Saputra, Mulyana Syaiful Alam Undang Mardiana Yuyun Yuniardi Zakaria, Zufialdy Zufialdi Zakaria, Zufialdi