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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 6 Documents
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Search results for , issue "vol. 13 no. 3 (2026)" : 6 Documents clear
Combining Lithium Isotope Systematics, Stable Isotopes, and Major Elements as a Powerful Tool for Detection of the Slab-Dehydrated Fluids in Southwestern Japan Rofiqul Umam
Indonesian Journal on Geoscience Vol. 13 No. 3 (2026)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.13.3.393-407

Abstract

This research aims to obtain a very sensitive geochemical analysis method to detect the contribution of thermal water or slab-dehydrated fluids to the surface waters of the Arima hot spring water in southwestern Japan. In this study, four groundwater samples from the previous research in the form of lithium isotope systematics and chlorine were taken from the public baths of the Arima hot spring waters. In addition, fourteen Arima hot water samples in the form of stable isotope and major element data of fourteen Arima hot water samples from previous research were also used. The interpretation of lithium isotopes (δ7Li) and Cl/Li ratios shows that four groundwater samples in this study have a δ7Li < 5 ‰ and Cl/Li < 1,000 and are in the thermal water category. Meanwhile, thirteen Arima hot spring waters from the previous research do not have lithium isotope (δ7Li) data and might be able to be estimated based on Li > 0.1 lmg/l, Cl > 1,000 lmg/l, and Cl/Li < 1000 and are in the thermal water category. One of the Arima hot spring waters from the previous research is a mixing water category with fairly high Cl, namely 435 mg/l. The combinations of lithium isotope systematics, stable isotopes, and major elements might be useful as a powerful geochemical analysis for the detection of slab-dehydrated fluids.
A Comprehensive Evaluation of Sandstone Reservoirs: A Methodological Study on The Impact of High Chlorite Content Thanh Tung Nguyen; Hoang Anh Nguyen; Thuan Van Nguyen; Triet Le Minh; Quang Tuan Nguyen
Indonesian Journal on Geoscience Vol. 13 No. 3 (2026)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.13.3.373-392

Abstract

Chlorite-bearing sandstone reservoirs often pose challenges in hydrocarbon zone interpretation due to their dual effects: porosity preservation and pore-throat blockage at depth. For a better understanding, this study integrates multiple methodologies, including mineralogical analysis of core samples and petrophysical logging, to classify and to assess the influence of high chlorite content on reservoir quality; a comprehensive well log interpretation approaches and machine learning (ML) to water saturation estimation in chlorite-affected intervals. Based on porosity and permeability measurements, thin-section analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), as well as special core analysis (SCAL), the morphologies of chlorite are mainly grain-coating, rosetted boxwork, and floccules. Furthermore, the reservoirs are classified into four groups according to chlorite impact levels. Classes 1 and 2 exhibit minimal chlorite influence, whereas classes 3 and 4 show a significant chlorite effect. Notably, class 4 demonstrates lower permeability than class 3, despite higher porosity and a stronger impact of chlorite due to pore-throat blockage by abundant chlorite floccules. Water saturation analysis reveals that in high-chlorite zones, the dual-water model provides more accurate results than Archie’s equation, whereas in low-chlorite intervals, both methods yield comparable outcomes. Additionally, ML-based predictions using the state-of-the-art LightGBM tool on well-log data exhibit strong alignment with core analysis and empirical calculations, with R²= 0.8804 and RMSE = 0.0572. These findings significantly enhance water saturation estimation in chlorite-impacted reservoirs and demonstrate broad applicability for assessing chlorite distribution in wells with limited core data or well log datasets.
High-Temperature Hydrothermal Fe-Ti Oxide Mineralization in The Arızlı Ophiolitic Mélange, Western Anatolia CİHAN YALÇIN; Adil Ozdemir
Indonesian Journal on Geoscience Vol. 13 No. 3 (2026)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.13.3.355-372

Abstract

The Arızlı Ophiolitic Complex in western Anatolia provides a distinctive geological context for comprehending Fe-Ti oxide mineralization processes in ophiolitic settings. This research examines the geochemical and mineralogical properties of Fe-Ti oxides using extensive fieldwork and laboratory investigations, including X-ray fluorescence spectrometry (XRF), inductively coupled plasma mass spectrometry (ICP-MS), and X-ray diffraction (XRD). Ten samples were obtained from ultramafic and mafic rocks, displaying notable mineralization characteristics. The geochemical investigations indicated Fe₂O₃ concentrations between 10.52 % and 19.93 %, with TiO₂ contents ranging from 2.17 % to 13.63 %, suggesting hydrothermal and metasomatic processes. Discriminant diagrams, including Si-Al, Fe/Ti-Al/(Al+Fe+Mn), and Fe-Six2-Mn, validated the hydrothermal genesis of the deposit, supplemented by volcano-sedimentary processes Elevated Fe/Ti ratios and the clustering of samples within high-temperature hydrothermal domains (~300-500° C) suggest that hydrothermal fluids and metasomatic overprinting played a significant role in the formation of Fe-Ti oxide mineralization. A comparative analysis with other ophiolitic complexes, such as the Oman and Pindos ophiolites, underscores both common mineralogical-geochemical traits and unique attributes of Tthe Arızlı Ccomplex, notably its comparatively elevated aluminium enrichment. This work examines critical deficiencies in comprehending the genetic regulations and structural impacts on Fe-Ti oxide mineralization in ophiolitic environments. The findings offer a valuable foundation for subsequent research and resource evaluations, enhancing regional metallogenic models of hydrothermal Fe-Ti mineralization in ophiolitic environments.
Extreme Drought Characteristics in Java (1960-1965) Muhshonati Syahidah; Rusmawan Suwarman; Dhara Brawijaya
Indonesian Journal on Geoscience Vol. 13 No. 3 (2026)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.13.3.409-422

Abstract

This study examines the characteristics of the extreme drought experienced in Java between 1960 and 1965, a period marked by consecutive years of dry conditions. The research employs the Standardized Precipitation Index (SPI) to quantify meteorological drought and to assess extreme events as defined by the World Meteorological Organization (WMO), focusing on magnitude, duration, and spatial extent. The analysis identifies extreme drought episodes in 1960 and 1965, with 1964 exhibiting the most extreme magnitude, indicated by SPI-12 values of ≤ -2. These droughts were notably prolonged, with a duration of up to thirty-nine months (from December 1960 to October 1964), and spatial analysis reveals that the southern half of Java was most affected, covering nearly half the region. Further analysis explores the influence of major climate anomalies, including El Niño (Niño 3.4), the Indian Ocean Dipole (IOD), the Pacific Decadal Oscillation (PDO), and other climate indices. Spatial correlation analysis confirms that ENSO and IOD were the dominant drivers, with Niño 3.4 and DMI showing strong negative correlations with SPI-12, particularly across Central and East Java. In contrast, the PDO exhibited a positive correlation with SPI-12, suggesting it may have played a moderating role by enhancing rainfall during its positive phase. The study concludes that drought duration is a critical dimension in defining extreme drought in Java and that accounting for both interannual (ENSO, IOD) and decadal (PDO) variability is essential for improving drought risk forecasting and resilience strategies in vulnerable regions.
Geochemical Study of Water and Gas in The Wayang Windu Geothermal System Arif Susanto; Niniek Rina Herdianita; Dasapta Erwin Irawan; Prihadi Sumintadireja
Indonesian Journal on Geoscience Vol. 13 No. 3 (2026)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.13.3.423-440

Abstract

This study presents a comprehensive geochemical and hydrogeological characterization of the Wayang Windu Geothermal System in West Java, Indonesia. The research aims to identify water and gas chemistry patterns, to determine fluid origins, and to estimate reservoir temperatures to support conceptual modeling of the geothermal field. Field sampling was conducted on hot and cold springs and fumarolic gases, complemented by laboratory analyses of major ions (Cl⁻, SO42⁻, HCO3⁻; Na⁺, K⁺, Mg2+), stable isotopes (δ2H, δ18O), and gas compositions (CO2, N2, Ar). Data interpretation employed standard geochemical tools, including Cl-SO4-HCO3 and Na-K-Mg diagrams for water classification, δ2H-δ18O plots for recharge source identification, and N2-CO2-Ar ternary diagrams for gas origin assessment. The results indicate that sulphate-type hot springs mark upflow zones, while bicarbonate-type warm and cold springs reflect lateral outflow and mixing processes. The isotopic signatures confirm predominantly meteoric recharge with localized steam-heated and magmatic influences. The gas geothermometers estimate reservoir temperatures between 225° and 286° C, and Cl-Li-B relationships reveal three distinct reservoir clusters: Gambung, Wayang, and Windu. These findings provide critical insights into fluid pathways, reservoir structure, and recharge dynamics, forming a robust basis for sustainable geothermal resource management in volcanic settings.
Shear Wave Velocity Profiling: Comparing MASW and SPT for NEHRP Site Classification Erfan Syamsuddin; Alimuddin Hamzah Assegaf; Adi Maulana; Ulva Ria Irfan
Indonesian Journal on Geoscience Vol. 13 No. 3 (2026)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.13.3.441-453

Abstract

Discrepancies between shear wave velocity (Vs) profiles derived from Multichannel Analysis of Surface Waves (MASW) and the Standard Penetration Test (SPT) pose significant challenges for seismic site classification under the National Earthquake Hazards Reduction Program (NEHRP) standards. This study investigates the effects of velocity contrasts and irregular subsurface stratification on the alignment of MASW and SPT Vs profiles. A MASW survey was conducted using an active seismic source and an array of geophones, with data processing involving preprocessing, dispersion curve extraction, and shear-wave velocity inversion using a Monte Carlo approach. The extracted dispersion curve spans frequencies from 25 Hz to 80 Hz, with phase velocities ranging between 200 m/s and 500 m/s. The inverted Vs profile indicates a progressive increase in shear wave velocity with depth, suggesting a compacting sedimentary sequence transitioning into bedrock at greater depths. The computed Vs30 value of 541.7 m/s classifies the site as NEHRP Site Class C (very stiff soil or soft rock). The correlation with regional borehole data confirms the presence of clay and silty deposits in the upper layers, followed by claystones and sandstones at depth. Despite the reliability of the MASW for seismic site characterization, discrepancies with SPT-derived Vs profiles highlight the challenges posed by velocity contrasts, irregular stratification, and higher-mode Rayleigh waves. Refining inversion techniques and integrating multiple geophysical methods are crucial for improving subsurface characterization and seismic hazard assessments. These findings emphasize the importance of considering seismic design regulations for infrastructure development in Site Class C soils, which can exhibit moderate ground motion amplification.

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