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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 10 Documents
 1 
Search results for , issue "Vol. 12 No. 2 (2025)" : 10 Documents clear
Zonality of Gold Ore and Prospects of Gold-Quartz-Sulfur in Khauau Deposit, Binhvan Commune, Chomoi District, Backan Province, Vietnam Dat, Nguyen Van; Tuan, Le Canh; Son, Trinh Hai; Linh, Nguyen Thi Hoang
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.12.2.199-215

Abstract

Khauau gold deposit, Binhvan commune, Chomoi District, Backan Province, Vietnam, is located in the Dong Bac Bo intracontinental orogenic belt. This is one of the important gold mineralization areas of Vietnam. To study the zonation of mineralization and to predict the prospect of deeply hidden buried gold ore, a research was conducted based on mineral facies analysis, fluid inclusion thermometry, ICP-MS chemistry, and morphological orebody size. The results indicate that the gold mineralization is derived from medium to medium–low temperature hydrothermal fluids associated with deep-seated formations. Inclusion homogenization temperature is from 170 to 310o C, and the main ore mineral components include pyrite, arsenopyrite to a lesser extent galena, sphalerite, and chalcopyrite. Gold mineralization-quartz-sulfur Khauau deposit is divided into three zones, which from the top to the bottom is as follows: ore zone 1 is gold-quartz-pyrite poor sulfur; ore zone 2 is gold-quartz-polymetallic; ore zone 3:is gold-quartz-arsenopyrite and pyrrhotite. Ore bodies are likely located at the depths of 125 to 540 m with many extending beyond 400 m. The depth of ore-forming processes is 562 m and the zoning coefficient of Kz= 0.83. Accordingly, it is possible to predict the prospect of the Khauau gold deposit, Binhvan commune, Chomoi District, Backan Province, to a depth of more than 500 m, and possibly extend to depths of up to 5 km.    
A Critical Distribution of Groundwater Infiltration Status on Agricultural Land Use in Manyaran, Indonesia Mujiyo, Mujiyo; Febryana, Nesia; Suyana, Jaka; Komariah, Komariah
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.12.2.249-265

Abstract

Agricultural land is vulnerable to drought disasters, and effective groundwater management is needed by identifying soil characteristics that support water infiltration. This study aims to assess the criticality of groundwater infiltration distribution in agricultural land in Manyaran District, and the relationship between soil physical characteristics and soil infiltration criticality, so that management strategies can be formulated to increase groundwater infiltration. The assessment uses an assessment method based on The Regulation of The Minister of Forestry P. 32/ Menhut-II/2009, which combines parameters such as soil type, permeability, slope, rainfall, and land use. It is modified by observations of important soil physical properties that affect hydrological processes, including soil texture, bulk density, and porosity, integrated into the analysis. Sampling points were determined using purposive random sampling in the land map unit obtained from thematic map overlay. The influence of land use factors on groundwater infiltration criticality using ANOVA data processing, while the physical properties that most determine infiltration conditions were identified through the Pearson correlation test. The results classify groundwater infiltration status into six categories: good, normal, light critical, moderate critical, critical, and heavy critical. Heavy essential catchment areas, especially in rice fields, are characterized by low soil permeability, porosity, and bulk density. These findings underscore the need for improved soil management practices for groundwater infiltration, such as the addition of organic matter and the implementation of ecological drainage systems, to increase water infiltration and reduce the risk of drought in the area.
Uneven Land Subsidence Patterns Along Java's Northern Urban Corridor (Pantura Route) from 2.5D SBAS InSAR Approach Janur, Afif; Harintaka, Harintaka; Suhadha, Argo Galih
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.12.2.281-300

Abstract

Land subsidence is a phenomenon that occurs in many parts of the world, particularly in coastal plains and river delta areas, including the north coast of Java, commonly known as ‘pantura’. By utilizing satellite time series data, land subsidence along the north coast of Java was detected using The Small Baseline Subset (SBAS) method. Additionally, combining data from different Sentinel-1 orbit directions (ascending-descending) enables the production of a more accurate 2.5D model. This research aims to calculate the rate of land subsidence on the north coast of Java from 2020 to 2023 using the 2.5D model, and to compare the results with CORS processing results. Recent identification of land subsidence highlights that residential areas and rice fields are highly vulnerable to potential subsidence. The 2.5D model in the up-down (UD) direction shows the highest land subsidence occurred in Demak Regency at 146.45 mm/year, Semarang City at 144.34 mm/year, and Pekalongan Regency at 137.94 mm/year. An accuracy assessment was performed using twelve CORS stations, showing RMSE values ranging from millimeters to centimeters: vertical ascending at 16.5 mm, vertical descending at 18.6 mm, UD at 8.8 mm, and East ̶ West (EW) at 26.3 mm.
Petrographical and Geochemical Characteristics of Felsic Volcanic Rocks in the Upper Part of The Khorat Plateau, Thailand Singtuen, Vimoltip; Seela, Thatchapon
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.12.2.231-248

Abstract

The felsic volcanic rocks distributed in the western part of Nong Khai and Udon Thani Provinces are part of The Loei-Phetchabun Volcanic Belt. This study aims to investigate the petrography and geochemical characteristics of felsic volcanic rocks to classify specific names of rocks and explain their occurrences. The textures and compositions by petrographic analysis classify the studied rocks into four types: (1) rhyolite porphyry, (2) crystal tuff, (3) eutaxitic rhyolite porphyry, and (4) hornblende-biotite diorite. In addition, the total alkaline versus silica (Na2O+K2O/SiO2) ratios classify these rocks into rhyolite, dacite, and basaltic andesite/diorite intrusion. Moreover, the major oxides and trace elements indicate that these volcanic rocks were generated from tholeiitic, transitional, and calc-alkalic magma series that formed along volcanic arcs. Therefore, the subduction of at least two tectonic terranes in the area may lead to the formation of the volcanic arc (felsic volcanic rocks and hornblende-biotite diorite).
Generating Indonesian-wide Vs30 Map Using Engineering Geomorphology Approach Cipta, Athanasius
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.12.2.217-229

Abstract

Earthquake hazards can be viewed from two perspectives, the first, source of earthquake and the second, place where we human live and carry out our activities. From the second point of view, information regarding the physical properties of soil where we are sitting on becomes crucial to calculate its vulnerability. Physical properties of soil, geologist calls it rock, are often represented by a single value, namely Vs30, which stand for average shear-wave velocity on the 30 m uppermost of soil. Measure Vs30 for whole country is a job with next-to-zero-possibility to complete, consequently, we need to have a technique to accurately estimate Vs30. Engineering gemorphology, a method that utilizes geology, and morphology to approximate Vs30 in national-scale level has been applied to create robust Vs30 data set for whole Indonesian region. Furthermore, the Mean Absolute Percentage Error (MAPE) is employed to judge the accuracy of the Vs30 produced from engineering geomorphology technique for Jakarta dan Jayapura data sets. According to MAPE score, which are 28.16% and 37.83%, engineering geomorphology is able to produce reasonable Vs30. If we split MAPE’s calculation into soil class of E, and D, in Jakarta the value is 39.63% (reasonable) and 24.75% (reasonable), while in Jayapura the MAPE score for E-, D- and C-classes are 74.22% (inaccurate), 40.09% (reasonable) and 24.00% (reasonable), respectively.
The Light Hydrocarbon Components and Oil-Oil Correlation in Niger Delta Crude Oil: Insights into Source, Thermal Maturation, and In-Reservoir Alteration Processes Egbo, Omonigho; ADEIGBE, Olubunmi; Esegbue, Onoriode
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.12.2.267-279

Abstract

Geochemical fingerprints offer useful insight into source inputs, thermal maturity, and alteration processes. Nonetheless, detailed light hydrocarbon (LH) compositional studies across The Niger Delta have not adequately been considered. Thus, twenty-six oil sets from several subbasins (depobelts) were examined, using gas chromatography (GC) approach, aimed at determining the source input and thermal maturity in-reservoir alterations, and then correlating the oils. This provides critical insights for oil characterization in the basin by examining the distribution and abundance of LHs. Mango's invariant K1 ratio of LHs clearly delineates the oils into two homologous sets, with a narrow range (0.83 ̶ 0.94 and 0.95 ̶ 1.13), consistent with the plot of ph/nC18 vs. pr/nC17 of heavy molecular weight (HMW). The studied oils reflect a modest distribution between Thompson's aliphatic and aromatic curves scheme (Kerogen Type), with heptane ratios varying from 0.64 to 22.04 %, on the average of 16.19 %, indicating contributions from a range of sources typical of type II/III kerogen. The LHs component of the examined oils has an overall six-ring preference, with methylcyclohexane varying from 46.15 to 81.86 %, the average of 56.50 %, dimethyl-cyc %, suggesting a significant input from higher plants. The data suggest expulsions from various source rocks of terrestrial organofacies, with variable contributions from marine sources that were initially laid down in oxic to sub-oxic environments, and range from early to peak oil thermal maturity. Nonetheless, most samples from Greater Ughelli showed varying degrees of evaporative fractionation, suggesting gas washing in the depobelt.
Advanced Satellite-Based Spectral Techniques for Identifying and Quantifying Soil Clay Minerals Devnita, Rina; Arifin, Mahfud; Ramadhan, Ilmi
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.12.2.301-318

Abstract

Soil mineral plays an important role in agriculture due to its ability in influencing soil physical and chemical characteristics, and therefore is important to be identified. The techniques for identifying soil minerals, such as the utilization of a polarization microscope and X-Ray Diffraction (XRD), are often laborious, time-consuming, and costly. This study aims to identify and to quantify soil clay minerals by using Hyperion EO-1 imagery and XRD methods, and to reveal the effectiveness of using satellite imagery to determine soil minerals. Spectral signatures from Hyperion EO-1 were extracted in alignment with the soil sampling coordinate locations, and spectral data processing methods such as Continuum Removal (CR), and Savitzky-Golay filtering were used to identify and to quantify minerals. The results show that hyperspectral analysis revealed distinct spectral absorption features, and it could identify kaolinite, chlorite, goethite, hematite, and plagioclase. Meanwhile, XRD analysis confirmed kaolinite and chlorite, consistent with the hyperspectral observations. A key advantage of the spectral absorption technique for raw soil was its ability to identify not only clay minerals, but also both primary and secondary minerals, such as plagioclase, hematite, and goethite, that remain unidentified when using the XRD method with iron removal pre-treatment. Although hyperspectral imagery was successful in identifying soil minerals, there are still some limitations that require further refinement, especially while conducting quantification. The findings underscored the potential of satellite-based hyperspectral analysis as a rapid alternative approach to soil mineral identification that can reduce reliance on laboratory-based methods.
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.
Integration of Soil Shear Strength Analysis with Wave Force Calculations to Optimize Coastal Slope Stability Soesanto, Edy; Muslim, Dicky; Sudjono, Evie Hadrijantie; Endayana, Cipta
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.12.2.145-162

Abstract

Coastal regions face significant challenges due to the dynamic interplay between waves and soil slopes, which can lead to instability and erosion. This study investigates the stability of coastal slopes under wave-loading conditions by integrating soil shear strength analysis with wave-induced forces calculation. The simplified slope stability analysis method serves as the framework for assessing slope stability, while wave characteristics such as height, period, and direction are considered to calculate driving forces induced by waves. Soil shear strength parameters, including cohesion and friction angle, are incorporated to determine the resisting forces within the soil mass. An example scenario illustrates the calculation process, demonstrating how wave shear stress and soil shear strength interact to influence slope stability. This research found that wave parameters such as height, period, and direction had a significant influence on the magnitude of the driving force acting on the coastal slope. The distribution of wave pressure and wave forcing is also described, showing a significant increase in pressure at certain depths. This research resulted in the integration of soil shear strength with calculations of forces caused by waves, which greatly influenced the stability of coastal slopes. This research shows that soil with higher shear strength has better resistance to forces caused by waves. Coastal slopes with a FoS value of more than 1 are considered stable, while slopes with a FoS of less than 1 indicate instability and potential failure. At a certain depth, driving forces are dominant, which increases the potential for slope failure. The main innovation of this research is the approach that combines hydrodynamic analysis with geotechnical analysis to assess coastal slope stability, the simplified slope stability method approach from Bea and Audibert (1981) to calculate FoS on coastal slopes, and the use of Historical Data and Numerical Modeling forForce Evaluation Wave.
Nickel and Scandium-Bearing Minerals Associated with Limonitic Laterite Zone of the Lameruru Deposit in Southeast Sulawesi, Indonesia Supit, Jance Mudjani; Idrus, Arifudin; Petrus, Himawan Tri Bayu Murti; Sukadana, I Gde; Pratiwi, Fadiah
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.12.2.175-197

Abstract

This study investigates nickel and scandium enrichment within a laterite profile developed on ultramafic rocks in the Lameruru area, Southeast Sulawesi. Utilizing mineralogical and geochemical analyses, the research examines transformations from parent rock through four laterite horizons: rocky saprolite, earthy saprolite, yellow limonite, and red limonite. Results reveal distinct enrichment patterns for Ni and Sc. Nickel is concentrated in the saprolite, hosted by minerals such as willemseite, vermiculite, lizardite, and antigorite, and decreases towards the red limonite, suggesting an initial enrichment during weathering followed by remobilization. Conversely, Sc increases throughout the profile, peaking in the red limonite and dominantly associated with goethite. Nickel is structurally bound within mineral lattices, while scandium is adsorbed onto mineral surfaces, particularly goethite in the red limonite. This contrasting behaviour highlights different geochemical controls influencing Ni and Sc enrichment during lateritization. Further research should explore these mechanisms to optimize recovery strategies.

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