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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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METHOD TO IDENTIFY THE FACIES ASSOCIATION ARCHITECHTURE BASED ON CORE ANALYSIS Ganjar Gani, Reza Mohammad; Firmansyah, Yusi; Nurdeani, Rifky
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.v2i3.15755

Abstract

Rock is a very important in knowing the geological processes that developed in the past and present. The geological processes recorded in the core rock or often known as the core. Core is a rock of subsurface drilling. From the rock core can be known the characteristics of rocks ranging from megascopic and microscopic characteristics. The results of megascopic and microscopic analysis will be known facies, deposit environments, facies associations and architecture. The data contained 3 rocks that have been in the description, after the analysis there are 3 facies including the foraminifera limestone, sandstone foraminifera and claystone foraminifera. The foraminifera limestone is deposited on the Patch Reef Interior Platform environment, the foraminifera sandstones are deposited on the Restricted Interior's platform environment and the foraminifera claystone is deposited on the Open Marine Interior Platform environment. All three facies are integrated into the facies association Restricted - Open Marine Platform.Keywords : Core, Facies, Facies Association
SWELLING POTENTIAL OF CLAY SOIL KALIWANGU FORMATION IN CIBOGO DISTRICT, SUBANG REGENCY AREA BASED ON ITS BASIC PHYSICAL PROPERTIES Prasetio, Rio Akmal Rizky; Sophian, Raden Irvan; Firmansyah, Yusi; Khoirullah, Nur
Journal of Geological Sciences and Applied Geology Vol 7, No 2 (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.v7i2.49958

Abstract

The research is conducted in Cibogo District, Subang Regency. Focus of the research is taking samples in area inside Kaliwangu Formation by doing field observation and field sampling using disturbed sample method then it will be tested in laboratory for its basic physical properties. Result of its basic physical properties will be analyzed to determine their swelling potential by taking 5 sample of soil from Kaliwangu Formation. Based on sieve analysis every sample of Kaliwangu Formation (Pk) have more than 50% of clay fraction for each sample, and based on Atterberg limit test Kaliwangu Formation (Pk) samples are dominated by Silt High Plasticity (MH) soil with 3 samples of the MH type and only 2 samples of the CH type. According to consistency limit test of Kaliwangu Formation (Pk) soil, the swelling potential can be determined by classify it based on liquid limit (%) and plasticity index (%) using swelling potential classification. Using the soil consistency value, especially the liquid limit value and the plasticity index value, it can be classified as the swelling potential of Kaliwangu Formation (Pk) classified as high - very high potential with a very high dominance.
LITHOLOGIC ORDER MAPPING AND ROCK RESOURCES INVENTORY OF KUTAWARINGIN QUADRANGLE, WEST JAVA Ganjar Gani, Reza Mohammad; Firmansyah, Yusi; Nurdrajat, Aji
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
LITHOLOGY UNITS PENGKOL AREA AND SURROUNDING, GUNUNG KIDUL DISTRICT, YOGYAKARTA PROVINCE. Gani, Reza Mohammad Ganjar; Firmansyah, Yusi; Nurdeani, Rifky
Journal of Geological Sciences and Applied Geology Vol 4, 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.v4i2.31820

Abstract

The research area is located sub-district Nglipar,District of Gunnung Kidul,Yogyakarta Province. Accessibility to the research location by train Bandung - Yogyakarta, followed by a minibus to Nglipar District Gunung Kidul. Purpose Of this Research is to understanding geological conditions of the research area reviewed from litohologic units and  its stratigraphic order. The lithostratigraphy of the research area is divided into 3 lithologic units, Breccia Unit, Sandstone Unit and Limestone Unit. namely the naming of the rock units based on observable physical characteristics, including rock type, uniformity lithology symptoms and their stratigraphic position. Geological history at the location of this study is the eruption of Mount Ngalanggran and deposited volcanic breccia units. Early Miocene deposited units sandstone. At that time there was a decrease in sea level which caused the diagenesis of the sedimentary material into limestone material. On Middle Miocene limestone deposited. Keyword: Lithologic units, stratigraphic order, Gunung Kidul District.
GEOMORPHOLOGIC AND STRATIGRAPHIC DETERMINATION USING OUTCROP DATA, THIN SECTION AND MICROFOSSIL ANALYSIS IN BENTARSARI AREA, BREBES DISTRICT, CENTRAL JAVA Dewi, Viska Triaraminta; Nurdrajat, Nurdrajat; Firmansyah, Yusi; Fachrudin, Kurnia Arfiansyah
Journal of Geological Sciences and Applied Geology Vol 2, No 6 (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.v2i6.20876

Abstract

Administratively, Bentarsari area was located in Salem Sub-District and Brebes District in Central Java Province with coordinate 108°46’45,15” - 108°49’28.29” BT - 108°39’32.4” BT and 7°7’40.34” LS - 7°10’22.22” LS.  This research aims is to give an understanding about geological condition in geomorphology and stratigraphy aspects which are described by thematic map in 1:12.500 scale within an area of 25km2. This research was accomplished with surface data (outcrop) and field orientation method using of GPS, geological compass, loop, geological hammer, comparator, and any other tools. Afterward, thin section and fossil analysis were also collected to determine the type of rocks and the age of the stratigraphy unit. This research will include the classification of geomorphology unit based on 3 aspects, which are morphography,  morphometry, and morphogenetic and also classification of stratigraphy unit, based on characteristics of rocks such as rock texture, mineral contents and fossil contents. The geomorphology of the Bentarsari region can be divided into 3 (three) geomorphological units, namely: the alluvium high altitude fluvial unit, high hills of steep structural sediments unit, and very steep high structural sedimentary hills unit. While the Litho-stratigraphic on research area divided into 4 (four) units, from the oldest to the youngest stratigraphy position is sandstone unit (Tbp), claystone unit (Tbl), fine-grained sandstone unit (Tpbph), and breccia unit (Qpbx). Thus, by having the result of this research, can be useful as a reference to have further studies in this located area. 
LITOFASIES ANALYSIS IN THE CIPAMINGKIS RIVER ROCK FORMATION JATILUHUR, BOGOR, WEST JAVA. Gani, Reza Mohammad Ganjar; Firmansyah, Yusi; Nurdrajat, Nurdrajat; Fathin, Muhammad Kayis
Journal of Geological Sciences and Applied Geology Vol 5, No 3 (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.v5i3.38253

Abstract

The Sedimentary rocks result from the breakdown of previously transported rocks deposited and lithified. Sedimentary rocks cover almost 80% of the earth's crust (Folk, 1974). The research was conducted in the Cipamingkis River, Jonggol District, Bogor Regency, West Java. The research area is included in the Cianjur Regional Geological Map Sheet (Sudjatmiko, 1972) and is included in the Dayeuhkaum Earth Map (1209 – 233) published by the Geospatial Information Agency (BIG). The Jonggol District, Bogor Regency, West Java, has a large river, the Cipamingkis R,iver, stretching from the northeast to the southwest of the study area. This river is included in the Jatiluhur Formation (Sudjatmiko, 1972). The facies is a rock body with a different combination of physical, chemical and biological characteristics from the surrounding rock body, which reflects its original conditions, namely the way it was transported and the way it was deposited. Two bodies of rock deposited simultaneously have different facies if they have differences in their physical, chemical and biological characteristics. Units and sediment structure components in the study area are grouped into six lithofacies: (1) Thin-Medium Sandstone Layer, (2) Massive Claystone, (3) Alternating Sandstone and Claystone, (4) Thick Sandstone Layer, (5) Alternating Fine Sandstone and Very Fine Sandstone, and (6) Slump Deposit. Description of facies by limiting physical and chemical characteristics is called lithofacies, and lithofacies is a facies analysis method by considering information about physical and chemical characteristics of rock layers (Nichols, 2009).
INTERPRETATION OF GAMMA RAY VALUE BASED ON OUTCROP DATA IN SIMPENAN AREA, REGENCY OF SUKABUMI Firmansyah, Yusi; Ganjar Gani, Reza Moh.; Nurdrajat, Aji
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
Lithofacies of the Halang Formation in the Cijurey River-Majalengka Abdurrokhim, .; Firmansyah, Yusi; Natasia, Nanda; Saputra, Mulyana
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.v2i3.15614

Abstract

This report discusses lithofacies composition of the upper part Halang Formation that is well exposed along the Cijurey River, Majalengka - West Java.  A total of 450-m-thick continues section of the Halang Formation have been measured and described. The lithofacies composition of the Halang Formation in the Cijurey River consists of alternating thin- to very thin-bedded sandstones and mudstone, un-bedded mudstones, very thick pebbly mudstones, breccia and slump. Andesitic igneous rock intruded locally to this formation.
SOIL ERODIBILITY AND ITS EROSION POTENTIAL IN SADAWARNA DAN AND SURROUNDING AREA, CIBOGO DISTRICT, SUBANG REGENCY, WEST JAVA PROVINCE Alpionisa, Salsabila Nur; Zakaria, Zufialdi; Khoirullah, Nur; Sophian, Raden Irvan; Firmansyah, Yusi
Journal of Geological Sciences and Applied Geology Vol 7, No 2 (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.v7i2.49995

Abstract

The Sadawarna Dam and its surroundings, which are located in Subang Regency, are currently under construction. Change in land use caused by the construction occurred. Land management and soil conservation are needed to prevent uncontrolled erosion because it can caused slopes in critical condition, flood occurred in the downstream areas of river, and silting of dam. One of the information in land management and soil conservation is by identifying the soil erodibility which aims to find out the sensitivity of the soil to erosion in the research area. Soil erodibility affected by grain size distribution, soil structure, soil organic matter, and soil permeability. In this research area, the soil erodibility was calculated based on disturbed sample in the field which was then tested in the laboratory. The laboratory tests include sieve analysis, hydrometer analysis, and %c organic. Soil permeability obtained from previous studies. The research area is dominated by clay-sized soil which are the result of weathered claystone in Subang Formation. Soil erodibility value in the research area ranged from 1,100 – 0,448 t ha h/ha MJ cm with dominance of low soil erodibility classes. The dominance of clay-sized soil causes low soil erodibility value because clay sized soil has cohesive properties so it tends to be difficult to erode.
Slope Stability Analysis of East Ring Road Construction at Sadawarna Dam With Shear Strength Reduction Method Putra, Rafino Kurnia; Zakaria, Zufialdi; Alfadli, Muhammad Kurniawan; Sophian, Raden Irvan; Khoirullah, Nur; 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.v7i3.50589

Abstract

Slope stability has been a problem that studied on geotechnical works for the uncertainties such as varieties of soil behaviours to unpredicted failure of measurements and samplings. The Limit Equilibrium Method (LEM) has been popular for decades for its convenience but cannot determine displacement thus the result could be uncertain. As computational calculations have been developed, the Finite Element Method (FEM) began to use as a tool to not only determine factor of safety, but also determine displacement and forces that affect slope’s stability. This research was done to analysed slope stability using Shear Strength Reduction (SSR) and compared it to general method such as Limit Equilibrium Method (LEM). The research was conducted on a section in Sadawarna DAM ring road area, Subang, West Java. Slope on research area was divided into two layers with the bottom layer relatively non-cohesive compared to the top of layer. Both soil however dominantly consist with fine grain soil such as silt and clay. The upper layer of slope can contain more water with liquid limit of 73,46% compared to the lower layer with 68,27% liquid limit.  Simulation result showed slope that analysed using SSR method has Factor of Safety (FoS) 0,12 lower than LEM method. SSR method could be used to analysed pessimistic value at worst scenario and could predicted deformation of slope.
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