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INDONESIA
IJOG : Indonesian Journal on Geoscience
Published by Geological Agency of Indonesia
ISSN : 23559314     EISSN : 23559306     DOI : -
Core Subject : Science,
Earth & Planetary Sciences
The spirit to improve the journal to be more credible is increasing, and in 2012 it invited earth scientists in East and Southeast Asia as well as some western countries to join the journal for the editor positions in the Indonesia Journal of Geology. This is also to realize our present goal to internationalize the journal, The Indonesian Journal on Geoscience, which is open for papers of geology, geophysics, geochemistry, geodetics, geography, and soil science. This new born journal is expected to be published three times a year. As an international publication, of course it must all be written in an international language, in this case English. This adds difficulties to the effort to obtain good papers in English to publish although the credit points that an author will get are much higher.
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Articles 790 Documents
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A New Pollen Preparation Technique Using Technical Chemicals Sukapti, Woro Sri; Yulianto, Eko
Indonesian Journal on Geoscience Vol. 11 No. 2 (2024)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.11.2.313-324

Abstract

The widespread use of pollen analysis in various fields in Indonesia is hampered mainly by the application of pro-analyst chemicals in standard pollen preparation. To solve this problem, a new pollen preparation technique using technical chemicals was developed. The results of comparison between this new technique with the standard technique used before showed that the pollen-spore yields, the quality of pollen slides, and the slide visibility resulted from both techniques is comparable. Furthermore, the new technique reduced the chemical cost of the standard technique by IDR. 87,125.00 per sample.
An Analysis of Coal Seam Lithology using The Well-logging Method for Correlation of Location X, Musi Banyuasin Coalfields, South Sumatra Lubis, Ashar Muda; Larang, Miranda Puspa; Fahmi, Khairul; Shah, Afroz Ahmad
Indonesian Journal on Geoscience Vol. 11 No. 2 (2024)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.11.2.221-229

Abstract

South Sumatra region has abundant potential coal reserves, but the lack of structural and stratigraphic data makes it not be easy to map their total extent and to understand the genesis. These limitations can be partially resolved using the borehole well-logging methods. The aim of this research was to investigate correlation of coal seam lithology using the well-logging methods in a coalfield, location X, Musi Banyuasin, South Sumatra. The several exploration activities were conducted using the well-logging method to acquire gamma-ray logs and density logs data from seven boreholes, namely PMCBS12, PMCBS13, PMCBS14, PMCBS15, PMCBS16, PMCBS17, and PMCBS19 sites. WellCAD software was used during the data processing to derive logging data (gamma-ray and density logs), and Minex software was utilized to analyze the physical parameter correlation among boreholes. Borehole data analysis was carried out by analyzing the lithology contained in the borehole, especially to analyze the characteristics of the coal seam, such as depth and thickness. The results suggest that the thickness of the existing coal seam in area X is at seam 6 from a depth of about 2.95-19.95 m, with a coal seam thickness ranging from 1.85 m in the PMCBS12 to a thickness of 3.6 m in the PMCBS19 well. Two to three - vertically spread seams were found in each borehole with a thickness of about 0.35-3.6 m at various depths. Correlation results among boreholes show that the distribution of coal seams extends from the northwest to the southeast with a distribution direction of N300˚E/6˚.
Coastal Abrasion Vulnerability of the Southern Seluma Regency, Bengkulu, Based on Seismic Properties and Parameters Elasticity Natasya, Indah Dwi; Refrizon, Refrizon; Hadi, Arif Ismul; Fadli, Darmawan Ikhlas; Larang, Miranda Puspa; Putri, Elona Gita Gatra; Maghribi, Faritz Bagda; Sumanjaya, Erlan
Indonesian Journal on Geoscience Vol. 12 No. 1 (2025)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.12.1.133-144

Abstract

Geophysical investigations were conducted in the coastal area of Seluma Regency using Multi-Channel Analysis of Surface Waves (MASW) to determine subsurface geology, material stiffness, and potential weak zones to a depth of approximately 30 m. This study aims to identify and map the susceptible areas to abrasion in Seluma Regency coastal region and to analyze the causal factors associated with parameters elasticity of subsurface rocks. Data acquisition, processing, and inversion have been parameterized and selected to produce shear wave velocities representing actual subsurface conditions using Win-MASW 5.0 Professional software. The shear wave velocity analysis shows that the coastal area of Seluma Regency has the potential for high and moderate ground deformation which is vulnerable to abrasion. The area with high deformation potential is the Air Periukan Sub-Regency, Seluma Regency, Indonesia.
The Weighted Values of the Factor's Classes Based on Different Approaches for Potential Zones of the Groundwater Mapping Using Remote Sensing Data and GIS Technique in the Taiz Region, Yemen Abdullah, Anwar; Abdul Aziz, Ahmed; Isnain, Zulherry
Indonesian Journal on Geoscience Vol. 12 No. 1 (2025)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.12.1.105-131

Abstract

Remote sensing and geographical information system (GIS) have become one of the leading tools in the field of groundwater, which help in assessing, monitoring, and mapping groundwater resources, especially in semi-arid areas. The objective of this paper is to assess and to map groundwater potential zone in Taiz Governorate by the overlaying technique of the geospatial factors. The available twelve factors were prepared in this work from different data sources using several processes. The soil and landuse factors were prepared from Landsat-7 with the colour enhancement technique and supervised classification. The lineament, automatic drainage, slope, elevation steepness (topography) and aspect were derived from DEM, rock units, geological faults, and contact created from previous geological map. Geophysical subsurface faults were also prepared from previous magnetic faults. The rainfall data was generated from the previous annual rainfall reading. All these maps were prepared and classified to be suitable for weighted values and GIS overlying model. The manual, scaling, and matrix weighted values were assigned to the factor (raster) maps to produce three groundwater potential zone maps. These maps were classified into five classes as very low, low moderate, high, and very high potential zones. Three groundwater potential maps produced in this work were compared together and evaluated using matching technique with previous prospecting groundwater map. The percentages of the matching were 58.56 % for the potential map of the matrix analysis, 27.95 % for the potential map of the scaling equation, and 13.49 % for the potential map of the manual weighted values. This evaluation shows that the potential map of matrix weighted values scored the highest of matching, and it is the best potential map compared with the other two maps. The new finding in this work was more than six new places in the best groundwater potential map of the area noted as new groundwater potential areas. The locations of these areas were NE corner, S-SW, W, NW corner, N, and some places in the central parts of the studied area. Hence, the resultant map may contribute to optimize the choice of location of future drilling, and to increase the chances to take water from new wells which will satisfy the increasing water demand of local population. Moreover, the groundwater potential zone map was assessed for the first time using these techniques in the area, and all maps of the factors created in this research are new maps that may represent the new database of the area.
The Sliding Surface Determination of A Deep-seated Landslide on Cisumdawu Highway, West Java, Based on The Electrical Resistivity Tomography Santosa, Imam; Sulaksana, Nana; Yuningsih, Euis Tintin; Zakaria, Zufialdi
Indonesian Journal on Geoscience Vol. 11 No. 2 (2024)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.11.2.189-199

Abstract

Sumedang is one of the regencies in West Java Province that usually experiences landslides due to its lithology, slopes, and water level conditions. Previously slow-moving landslides occurred between 2016 and February 2021, affected the new Cileunyi-Sumedang-Dawuan (Cisumdawu) Highway at Section 2, Station 21 in the North Sumedang District. This research aims to identify the causes of these landslides using a combination of geological field observation, subsurface geo-electric resistivity-based survey, and borehole drilling. A total of fourteen boreholes were drilled to collect geotechnical data from the subsurface of the researched area, including the soil material and N-SPT value. The soil hardness and resistivity were measured and compared to establish the relationship between resistivity and engineering properties. The result of the resistivity measurement showed that the percolating water zone in the permeable loose soil was located above the impermeable layer, estimated as a slip surface. The subsurface measurement and borehole data show that the lithology of the sliding surface is a layer of clay with a thickness of 5 - 12 m, the slope of the sliding surface is 20o, and the depth is between 24 - 26 m. The cover layer of the sliding surface is a layer of silty clay and gravelly clay with a thickness of 5 - 10 m. Thus, based on the data presented, installation of bore piles and groundwater level monitoring need to be done as mitigation efforts.
The Development of Environmental Friendly Biological Sulfur Recovery Unit (BSRU) For Sulfur Coated Urea with Slow Release Fertilizer Method: A Case Study in Field X Indriani, Erdila; Athallah, Fairuz; Despriadi, Eryko; Purnomosidi, Purnomosidi
Indonesian Journal on Geoscience Vol. 11 No. 2 (2024)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.11.2.167-172

Abstract

The absorption of nitrogen from urea fertilizer is significantly inefficient. Due to its solubility in water. This problem can be overcome by producing slow-release fertilizer (SRF) that inhibits urea from being dissolved in water. Sulfur-coated urea (SCU) is one of the SRF methods. Therefore, this study aimed sulfur-coated slow-release urea fertilizer using sulfur waste from the Biological Sulfur Recovery Unit (BSRU) in Field X. A total of 14 tons of sulfur cake was produced daily by BSRU in Field X and sent to the laboratory for composition analysis, followed by drying. Subsequently, the dried sulfur was into a powder using a hammer and sieved to achieve a size of 200 mesh. Based on the results, SCU with the sulfur to urea ratio of 1:1 and mixing time of 15 minutes exhibited the best performance in dissolution tests with the longest dissolution time of 5 minutes which was better compared to the uncoated urea. After 7 days of observation, spinach that received SCU was more fertile and greener. The calculated NPV and payout time were 88712 million IDR and 1.76 years, respectively. This indicated that the development of this study was economically attractive. In conclusion, the value of sulfur waste from gas processing was increased by using sulfur waste from BSRU as a coating of urea while reducing related environmental effects.
Ichnofossil of Nanggulan Deltaic System: Case Study of Watupuru Cross Section in Kulon Progo, Central Java, Indonesia Nuraini , Siti; Syafri, Ildrem; Muljana, Budi; Sudradjat, Adjat
Indonesian Journal on Geoscience Vol. 11 No. 2 (2024)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.11.2.295-312

Abstract

The Nanggulan Formation in Kulon Progo, Yogyakarta, Indonesia, is rich in ichnofossils as observed in a cross-section of the Watupuru River. This research aims to explore the relationship between ichnogenera, their behaviours and patterns during the deposition of the Nanggulan Formation in the Middle to Upper Eocene period. The study involved analyzing measured sections along the Watupuru River, paleocurrent measurements, and palynology. Seventeen ichnogenera were identified and linked to seven depositional facies within the Nanggulan Formation, i.e. Nummulites bank, prodelta, strand plain, delta front, delta plain, sandflat, and fluvial sand, categorized into autochthonous and allochthonous rock units. Allochthonous rocks, like tempestite and turbidite, were discovered within the autochthonous Nanggulan Formation with ichnogenera present in both types of rocks. Ichnofossils associated with the prodelta facies in autochthonous rocks included into Bergaueria, Siphonichnus, Phycodes, Trypanites, Treptichnus, Teredolites, Chondrites, and Thalassinoides, tend to indicate a muddy suspension environment. In contrast, the delta plain facies (FDP) indicating a calm oxidizing environment with ichnogenera contents like Teredolithes, Bergaueria, Scoyenia, Aulichnitus, Helminthopsis, Chondrites, Gastrochaelites, Ophiomorpha, and Siphonichnus were recognized. Factors influencing ichnofossil diversity include lighting, behaviour or adaptation to the environment, sedimentation rate, current control, and burrow infilling. The diversity of ichnofossils in allochthonous tempestite layers was influenced by post-catastrophic storm events. Barren ichnogenera at the base of tempestite layers indicated early storm surges, while the upper layers contained diverse ichnogenera such as Gastrochaelites, Psilonichnus, Bergaueria, and Planolites in the delta front facies (FDF). Tempestite layers in the sandflat facies (FSF) containing ichnogenera such as Thalassinoides, Bergaueria, Rhizocoralleum, Planolites, Cylindrichnus, and Siphonichnus, tend to show a favorable environment for organism post-storm.
Fluid Inclusion and Mineralization of Base Metals in Cretaceous Metamorphic Rocks, in Jiwo Hills, Bayat, Klaten, Central Java Maulana, Fivry Wellda; Rosana, Mega Fatimah; Yuningsih, Euis Tintin; Haryanto, Agus Didit; Purwanto, Heru Sigit; Rakhman, Arie Noor
Indonesian Journal on Geoscience Vol. 11 No. 2 (2024)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.11.2.251-267

Abstract

The lack of mineralization research on metamorphic rocks in Java, especially in the Jiwo area, is part of the research interest. The host rock of ore mineralization in the Jiwo area is Cretaceous metamorphic rock located in the hilly area of Jiwo, Klaten, Central Java. The presence of chlorite, actinolite, quartz, epidote, and garnet minerals indicates the metamorphic facies of greenschist. Meanwhile, the presence of glaucophane, quartz, and epidot minerals is a metamorphic facies of blueschist. The metamorphic rock research method was carried out in several stages: 1. Observation; 2. Field data collection, including mapping of metamorphic rock distribution, general geological conditions and rock sampling; and 3. Laboratory analysis. Laboratory analysis testing consists of petrography, ore microscopy, geochemistry (AAS), and fluid inclusion. Alterations that develop in the researched area are in the form of propylitic (chlorite, calcite, epidote), argillic, and silicification (quartz, graphite, calcite, carbonate minerals). Ore microscopy analysis has identified the presence of mineral sulfide such as pyrite, chalcopyrite, bornite, galena, and covellite. In addition, galena was found covered with chalcopyrite. Based on AAS analysis on mineralized metamorphic rocks, Au levels are 0.001 - 0.008 g/t, Ag 0.1 - 2.4 g/t, Cu 4 - 75 g/t, Zn 14 - 166 g/t, and Pb 11 - 60 g/t. The inclusion of fluid from the discordant vein was obtained with a homogenization temperature (Th) of 312 - 435 0C, with a salinity of 1.95 - 5.05 wt. % eq. with isothermal mixing and heating depressurization conditions. The isothermal mixing process is a mixture of meteoric fluids and metamorphic fluids. Meanwhile, heating depressurization occurs during subduction, so that the temperature is relatively high. The homogenization temperature (Th) of the concordant vein ranges from 168.5 - 296.55 °C, with a salinity of 1.95 -12.6 wt% NaCl eq. A salinity of 12 wt% NaCl is formed due to liquids that are aquos trapped at high pressure and temperature conditions and the devolatilization process that occurs during subduction. Based on the plotting of the homogenization temperature range and the salinity of fluid inclusion, which is 168.5 - 4350C and 1.95 - 12.6 wt% NaCl eq, the type of deposits in the study area is in the range of Au lode or orogenic deposits. The existence of two homogenization clusters in the Jiwo Hill is estimated to be part of the process of forming the blueschist facies with greenschist which is shown in the retrograde actinolite in the glaucophane epidote schist rock which is part of the blueschist facies.
Micron to Nano Au Particles Incorporation in Different Stages of Pyrite, in Bau, Sarawak, Malaysia Sundarrajan, Vijay Anand; Marjon, Carolin Nicole; Musta, Baba
Indonesian Journal on Geoscience Vol. 12 No. 1 (2025)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.12.1.89-103

Abstract

In eastern Malaysia, Bau is the significant sediment hosted gold deposit (SHG), and Sarawak Province was the main gold (Au) producer in East Malaysia. The annual production rate was approximately 40 ̶ 50 metric tons of Au (high grade). The Bau mining is located 40 km SW of Kuching City, Sarawak. For the present study, around twenty-five samples were collected in the Au mineralized zones of Bau areas. The polished thin sections were prepared for mineral chemistry and fluid petrography analyses. The samples were studied through transmission microscope, Electron Probe Micro-Analyzer (EPMA), and fluid inclusion studies. From ore petrography, four stages of pyrite were classified. The first generation of pyrite is the early stage of diagenetic pyrite (Py1), Py2 is subeuhedral pyrite, Py3 is zoned pyrite, and Py4 is post-diagenetic pyrite. The mineral chemistry of different stages of pyrite was measured through EPMA. However, it is worth noting that the concentrations of these trace elements in pyrite have decreased pre-diagenetic and post diagenetic stages. The precipitation of Au in the main stages of pyrite was mainly controlled by pyrite structure, fluid ligands, and the temperature of crystallization.
Isotope Analysis of Coastal Groundwater in Padang City: Implications for Recharge and Salinization Febriarta , Erik; Larasati, Ajeng; Nur Kholis, Afid
Indonesian Journal on Geoscience Vol. 12 No. 2 (2025)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.12.2.163-173

Abstract

The development of Padang City in the coastal area is potentially faced with seawater intrusion. This study was conducted to determine the characteristics of shallow groundwater on the coast of the city using stable oxygen -18 (18O) and hydrogen -2 (2H) or deuterium isotopes, which are abundant in the nature. The isotopic analysis revealed variations in groundwater isotopic composition, indicating the possibility of diverse recharge sources. Although this study was primarily focused on salinity identification, the isotopic data provided preliminary insights into the influence of local meteoric recharge. Water samples were taken at several locations 5 m below the ground surface, and one sample of seawater was collected at an elevation of 0 m, which comes directly from sea water. On the average, they were located 270 m from the sea. The spectrometry of these water samples produced isotope ratios expressed per thousand or mil, which were then plotted on a graph illustrating the relative abundances of oxygen (18O) and deuterium (2H). Analyses of the stable 18O and 2H isotopes found two water samples close to the local meteoric water line (LMWL) and one sample interacting or mixing with seawater. The mixing effect is likely the product of evaporation and interaction between water and oxide minerals that compose the aquifer lithology, i.e. loose (sand) deposits. Based on the electrical conductivity, these samples had brackish water.

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