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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 117 Documents
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Tephrostratigraphy Study Using Petrographic Method in Leles Sub-basin, Bogor, WestJava Dea Carrisa; Muhammad Nasir; Yoga Andriana Sendjaja; Nisa Nurul Ilmi; Edy Sunardi
Journal of Geological Sciences and Applied Geology Vol 2, No 1 (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.v2i1.13424

Abstract

Tephrostratigraphy is a study used in determining pyroclastics layers,especially those in Ash/Tephrograin-sized, that can be used as a correlational tool to find out the order of sedimentation from one volcanic eruption. Leles Sub-Basinal, Garut, is composed mainly by Quartenary Sediment on the toppest layer and Tertiary Sediment on the bottom (Sunardi,2014). These thing of Garut Basin located in a plateau which is surrounded by volcanic plateau and dominated by lake sediment, and geographically located at low latitudes (Sunardi,2016). Based on the existence of Leles Sub-Basinal which is located on active volcanic complex, followed by its pyroclatics sediments, it is very ideal for this area to be the object of Tephrostratigraphy  Study. Moreover, earlier study was never been done before thoroughly at LelesSub-Basinal area.Based on mineralogical study, the tephroof Leles Sub-Basinal divided to Crystal Tuf, Lithic Tuf,and Vitric Tuf (Schmidt,1981). The commonly found minerals are quartz, plagioclase, pyroxen, feldspar, and opaque.The emersion of other minerals, suchasolivin, amphibole, and biotite are not visible in general. Based on the presentastion of that main minerals, it was concluded that the tephrolocated in Leles Sub-Basinal came fromandesitic and basaltic magma types. While from granulometric analysis, tephro from Leles Sub-Basinal was grouped in coarse ash and fine ash with well sorting and fall deposits mechanism of sedimentation. This tephrocontains many heavy minerals with bulk density variated around 2850-2900 kg/m3, which consists of apatite, biotite, and hornblende. Those heavy minerals are commonly found in ash falls lithology (Gale & Hoare, 2011). Stratigraphically, there were two period so feruption happening at Leles Sub-Basinal area, with unidentified volcanic vents due to lack of data. It is also concluded that the supported station in the south has stratigraphical  relationship with keystation. Keywords: Tephro, Tephrostratigraphy, Tuf, Leles Sub-Basinal. 
SOURCE ROCK CHARACTERISTICS BASED ON GEOCHEMICAL ANALYSIS AND 1D BURIAL HISTORY MODELING IN THE “NAY” FIELD SOUTH SUMATRA BASIN Nizalia Azzahra Yoza; Elrey Fernando Butarbutar; Yoga Andriana Sendjadja; Nisa Nurul Ilmi
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.v7i1.49033

Abstract

The research is located in the "NAY" Field, South Sumatra Basin at NAY 1-4 Wells. This research was carried out with the aim of knowing the characteristics of source rock such as quantity, quality, maturity, and depositional environment using geochemical analysis, then analyzing the burial history in the study area which was visualized in 1D modeling using Petromod. The results showed that the dominant Well has effective source rock in the Talang Akar Formation. The results of the 1-D Burial History modeling show that the NAY-1 Well is entering phase early mature at a depth of 2394 m at the Talang Akar formation in Early Pliocene (4.22 Ma) and starting to enter the mature phase at a depth of 2521 m in Middle Pliocene (3.27 Ma). The NAY-2 well is entering phase of early mature at a depth of 2521 m at the Talang Akar formation in Early Pliocene (2.64 Ma) and this formation is entering the mature phase at a depth of 2600 m which is Late Pliocene (1.32 Ma). The NAY-3 Well is still immature. Then the NAY-4 well entering phase of early mature at a depth of 2255 m at the Talang Akar Formation in Early Pliocene (2.27 Ma) and the Baturaja Formation at a depth of 2166 m in Late Pliocene (1.63 Ma). The results also show that the majority of the hydrocarbons found in this basin have a marine-terrestrial depositional environment.
Brief Communication: Rapid Assessment of landslide events based on UAV photogrametry: The 9 January 2021 Cimanggung Landslide, Sumedang, Indonesia Ali Abdurrahman; Muhammad Ariq Budipraja; Nur Khoirullah; Faisal Helmi; Raden Irvan Sophian
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.v4i2.32063

Abstract

The landslide incident in Cisarua Village, Cimanggung District on January 9, 2021, is one of the natural disasters which is quite concerning to see the victims. This short mapping is focused on seeing changes in the shape of the affected area and slope faces before the landslide and after the incident. The brief mapping uses the DJI Mavic Pro model UAV that flies at an altitude of 50 meters and 150 meters above the ground with an overlap of 80% and covers an area of 3 ha. Aerial photo processing will produce output in the form of orthophoto images and digital elevation models (DEM) of landslide affected areas. The result of geometric observation showed that the land surface was covered with an area of 3,789 m2. The measured flat length ranges from 120 meters and 32 meters wide. There is also a slope angle after and before the landslide of 2.8 degrees. Analysis of the causes of landslides in terms of geomorphological aspects shows the landslide affected areas that are right in the hilly valleys coupled with buildings that cover the surface water flow from high rainfall. In addition, the analysis of the causes of technical geological analysis shows that landslides can occur due to differences in soil types with different physical properties so that the two soils are not bound by cohesion forces between soils.
DETERMINING MATURITY RATE OF HYDROCARBON USING SAMPLE CORE FROM GEOCHEMISTRY SURVEY IN PADAMARANG SUB-BASIN, BONE GULF, SOUTH OF SULAWESI Widyatri Pusparini; Nisa Nurul Ilmi; Edy Sunardi
Journal of Geological Sciences and Applied Geology Vol 3, No 1 (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.v3i1.21231

Abstract

Sulawesi is one of the area in Eastern Indonesia that still has frontier area. South Sulawesi has several basins which formed as a result of tectonic activity that caused a geological condition complexity. The complexity of the regional geology is one of the interest of this research. The presence of gas seep within research area ensure that there is a potential petroleum system underneath the surface of the research area which is Padamarang sub-Basin, Bone Basin, South of Sulawesi. New insights into Bone Gulf is based on surface geochemical exploration that came up with 26 core sea sediments samples using piston core acquisition that has been analyzed with Gas Chromatography in sediment extract.  This study aims to identify the geochemical characteristics of migrated hydrocarbon. These geochemistry characteristics referred to depositional environment and maturity determination that are analyzed using non biomarker parameters including CPI and OEP, and cross plot between CPI and Pr/Phy. According to the CPI value has shown the number from 0.169 to 1.27 with the majority of the values is 0.4. While OEP value has shown the number from 0.312 to 1.5 with the majority of the values is 0.75.  Thus, according to the majority value of CPI and OEP, we could determine that it was thermally immatured.Keywords: Biomarker, Core, Geochemical, Non Biomarker, Padamarang
PRELIMINARY STUDY OF ROCK GEOCHEMISTRY FOR GOLD MINERALIZATION IN AREA-“X”, CENTRAL KALIMANTAN Cecep Yandri Sunarie; Kurnia Arfiansyah Fachrudin; M. Nursiyam Barkah; M Sapari D. Hadian; Bombom Rachmat Suganda; Faisal Helmi
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.v5i3.38348

Abstract

Area-“X” is located in the Central Kalimantan Province of Indonesia, one of several places in the Central Kalimantan region with a high potential for gold deposits. During the investigation, selected mineralized rock samples were collected, resulting in two rock outcrop samples and four rock float samples. All samples were analyzed for Au content at the local laboratorium using the Aqua Regia AAS method.  The lithology of the investigation area can be classified into two different rock units: The sedimentary rock unit and the igneous rock unit. The rock outcrop samples assay return with gold (Au) content from 0.21 ppm to 1.43 ppm. At the same time, the rock floated Au content from 0.79 ppm, Au, to 3.86 ppm. One rock outcrop sample named “Outcrop-001” identified as Quartz Vein up to 40cm width with N500E/850 strike and dip. The other two rock outcrop samples designated “Outcrop-002” and “Outcrop-003” are the parallel quartz veinlet up to 8cm width with strike N350E and unidentified dip. Based on field observation and assay results, this area-“X” has potential for gold mineralization as vein type.
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
COAL SEAM ANALYSIS WEST BATURAJA SUB-DISRICT, SOUTH SUMATERA Reza Mohammad Ganjar Gani; Yusi Firmansyah
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’.
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.
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
STRATIGRAPHY AND PETROGRAPHY OF ROCKS IN KARANGTENGAH VILLAGE AND SURROUNDINGS, BABAKAN MADANG SUB-DISTRICT, BOGOR DISTRICT, WEST JAVA PROVINCE REZA MOHAMMAD GANJAR GANI; Yusi Firmansyah; Nisrina Nadellia Putri; Tri Septianto Efendi; Kurnia Arfiansyah Fachrudin
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.

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