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Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Published by Pusat Survei Geologi
ISSN : 08539634     EISSN : 25494759     DOI : https://doi.org/10.33332
Core Subject : Science,
Chemistry Earth & Planetary Sciences Energy
The JGSM acts as a publication media of high quality scientific investigations resulted from various geological scientific issues. Published articles covers Geo-sciences, Geo-resources, Geo-hazards, and Geo-environments. Geo-sciences are basic earth sciences in geology, geophysics, and geochemistry. Geo-resources are applied earth sciences scoping in geological resources. Geo-hazards are applied earth sciences concerning in geological hazards. Geo-environments are applied earth sciences focusing in environmental geology.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 5 Documents
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Search results for , issue "Vol. 26 No. 4 (2025)" : 5 Documents clear
Geoheritage Potential of Non-Volcanic Hot Springs in Bangka Island: Implications for Geotourism Activities Permana, Asep K.; Yurnaldi, Dida; Rohiman, Asep; Kurnia, Kurnia; Koesworo, A.; Irzon, Ronaldo
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 4 (2025)
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i4.871

Abstract

Natural hot springs are important for various domestic purposes, health treatments, recreational bathing as well as settings for socio-cultural and traditional functions for thousands of years. However, most people are not aware and familiar with the key geological processes of these hot springs. There are three natural hot springs were discovered in the Bangka Island, while the origin and source of these hot springs are still poorly understood. This study provides the water characteristics of those springs and discusses of their origin by considering geological setting, as well as identified these hot springs as geoheritage sites potential. The surface temperatures of thermal springs range from 46 - 49° C, and the pH values ranges from 5.0 to 6.0. The hydro geochemical characteristic of hot springs is divided into two types, mature water and peripheral water. The anion composition (Cl-SO4-HCO3) obtained from water samples of the Permis Hot Spring contains high Cl, indicates as mature water type, and unrelated to recent volcanism. On the other hand, a water sample from the Nyelanding Hot Spring is relatively high HCO3which indicate as pheripheral water type, and far from the primary source. The Na-K-Mg ternary diagram reveals that water samples of the Permis hot spring is partial equilibrium water type with high Na and Cl compositions, while the Nyelanding one is immature water type characterised by high Mg content. Radiogenic granitic host rock represents the main heat source for both non volcanic hot springs in Bangka Islands. The heat is derived from deep-shallow circulation of meteoric water through fractures that cut into the granitic plutons. These hot springs are unique and show special features that play an important role in understanding of the dynamic of the Earth. These hot springs also have some significant geoheritage values, such as scientific, aesthetic, and recreational. Therefore, these hot springs have the potential to be properly conserved, managed and developed geoheritage sites and utilised for a sustainable geotourism development in Bangka Island. Keyword: Non-volcanic hot springs, geoheritage, geotourism, Bangka Island
Provenance dan Karakteristik Batupasir Formasi Pulau Balang dan Formasi Balikpapan Daerah Loa Janan Ilir, Kalimantan Timur Al Chasani, Nur Rahman; Jamaluddin, Jamaluddin
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 4 (2025)
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i4.914

Abstract

Formasi Pulau Balang dan Formasi Balikpapan yang merupakan bagian dari Cekungan Kutai dicirikan oleh keberadaan batupasir sebagai salah satu litologi dominan. Analisis komposisi butiran penyusunnya dapat memberikan informasi mengenai tatanan tektonik serta karakteristik batuan asal. Penelitian ini bertujuan untuk mengidentifikasi batuan asal serta memahami tatanan tektonik yang memengaruhi pembentukan batupasir di wilayah studi. Metode yang digunakan meliputi analisis petrografi guna menentukan asal batuan, kondisi iklim purba saat sedimentasi berlangsung, serta lingkungan tektonik daerah penelitian. Hasil penelitian menunjukkan bahwa wilayah studi berada dalam tatanan tektonik recycled orogenic dengan subzona berkisar antara transitional recycled hingga lithic recycled yang dipengaruhi oleh aktivitas subduksi dan kolisi yang membentuk sabuk lipatan Antiklinorium Samarinda. Rekonstruksi kondisi iklim purba saat pembentukan batupasir menunjukkan adanya variasi dari iklim basah hingga kering dengan batuan asal berupa batuan metamorf seperti gneis, sekis, dan sabak, serta granit yang mengalami metamorfisme tingkat rendah. Kata kunci: asal batuan, batupasir, iklim purba, tatanan tektonik Abstract The Pulau Balang Formation and Balikpapan Formation which are part of the Kutai Basin are characterized by the presence of sandstone as one of the dominant lithologies. Analyzing the composition of its constituent grains can provide insights into the tectonic setting and the characteristics of the source rocks. This study aims to identify the provenance of the sandstone and understand the tectonic framework that influenced its formation in the study area. The methods used include petrographic analysis to determine the origin of the rocks, the paleoclimatic conditions during sedimentation, and the tectonic environment of the region. The results indicate that the study area is part of a recycled orogenic tectonic setting, with subzones ranging from transitional recycled to lithic recycled, influenced by subduction and collision activities that formed the Samarinda Anticlinorium fold belt. The reconstruction of paleoclimatic conditions during sandstone formation suggests variations from humid to arid climates, with the source rocks consisting of metamorphic rock such as gneis, schist, and slate, as well as granite that underwent low grade metamorphism. Keywords: provenance, sandstone, paleoclimate, tectonic setting  
Active Faults in the Volcanic Environment of Pasirwangi Region, Garut Regency Yudhicara, Yudhicara; Robiana, Rahayu; Muslim, Dicky; Zakaria, Zufialdi; Dinata, Muhammad Nasheer Ramdan; Hartono, Tono
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 4 (2025)
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i4.999

Abstract

Garut Regency is surrounded by many volcanoes, both active and inactive. This area has also several active faults, which historically have been the source of earthquakes, including the Rakutak Fault Segment as part of Garsela Fault and several local faults. Some of earthquakes has magnitude less than M5.0 but causing damages, such as lately occured on September 18 and December 7, 2024.This study aims to identify the root causes of the major earthquakes that frequently occur in the Garut area, particularly those felt locally in Pasirwangi Sub-District and its surroundings, which causing infrastructure damages. Theresults are expected to contribute to disaster risk reductionand geological hazard-based spatial planning in Garut Regency, particularly in the study area. Active faults mapping was carried out using remote sensing, and field verification using drone and visual observations to obtain data that characterizes the presence of faults, joints measurements, rock offsets, river diversion and morphology lineaments. Site class identification was carried out by microtremor measurement using seismograph. Indications of active faults are found in the form of morphological and river lineaments, rock offsets, river diversion and the emergence of springs as indications of fractures along the fault line. Several sagponds were found including in Cihurang which is connected to Lake Ciharuswhich forms the Rakutak fault segment lineament whichis relatively southwest-northeast (SW - NE) oriented.Others were found at Lake Cipondok which is connectedto the river lineament in the Cibongkor area which has awest southwest-east northeast (WSW-ENE) direction. The down-dip faults were observed at Padaawas and has trend relatively south southwest - north northeast (SSW - NNE). Microtremor measurements obtain the dominant frequency values of the research area is in the range of 1 - 4 Hz, Periods of 0,25 – 1 second, the earthquake amplification factors of 3 – 7 times of earthquake shaking, Vs30 of 233 - 545 m/sec. The sediment thickness ranges from 25 - 64 m, and the land type is Class C (Hard Soil) and Class D (Moderate Soil). The Pasirwangi Sub-District and its surroundings, is located in a volcanic environment and is traversed by active faults, which are relatively southwest – northeast (SW-NE), west southwest - east northeast (WSW-ENE), and south southwest – north northeast (SSW-NNE). The Rakutak Segment of Garsela Fault, Padaawas and Cibongkor Faults are active faults that cross the research area, which is in the future could become the source of earthquakes, so that the community needs to be aware, especially those located close to fault lines. The potential for geological disasters in the Pasirwangi Sub-District and its surroundings, needs special attention from various parties, related to disaster mitigation efforts, both structural and non-structural. Keywords: Active Faults, Sagponds, Morphological Lineaments, Rocks Offset, Site Class
Karakteristik Faktor Penguatan Gelombang Gempabumi oleh Lapisan Lunak Permukaan, Studi Kasus di Wilayah Perkotaan Cianjur dan Sekitarnya Marjiyono, Marjiyono; Hidayat, Hidayat; Hamidah, Nimas Nurul; Hawan, Shofi Iqtina; Setiawan, Johannes Bosco Januar Herry; Andriani, Shofi
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 4 (2025)
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i4.1009

Abstract

Disamping dekat dengan sumber gempabumi, wilayah perkotaan Cianjur juga beresiko terhadap penguatan gelombang gempabumi oleh lapisan lunak litologi permukaan. Endapan soil yang cukup tebal di kawasan ini berpotensi menguatkan gelombang ketika terjadi gempabumi. Hasil pemodelan data mikrotremor array di 18 titik ukur diperoleh kecepatan gelombang geser soil berkisar antara 50 m/det. - 308 m/det. Endapan soil ini menumpang di atas batuan vulkanik yang memiliki kecepatan gelombang geser antara 246 m/det – 1415 m/det. Adapun ketebalan soil berdasarkan pemodelan data mikrotremor single station di 189 titik ukur berkisar antara 2 m – 62 m. Nilai faktor penguatan gelombang oleh lapisan soil ini berkisar antara 1 - 2,4 kali dengan zona penguatan tinggi berada di daerah Cugenang, Warungkondang dan Cilaku. Berdasarkan catatan, ketiga wilayah tersebut mengalami intensitas goncangan maksimum sebesar VIIVIII skala MMI. Kata kunci: penguatan gelombang, lapisan lunak permukaan, mikrotremor array, mikrotremor single station. Abstract The Cianjur urban area is exposed to a substantial risk, particularly near the seismic source and due to site amplification, resulting from a soft surface layer. The fairly thick soil deposits potentially amplify seismic waves when an earthquake occurs. According to the microtremor array that was deployed on 18 locations, soil shear wave velocity ranges from 50 m/sec to 308 m/sec. This soil deposit lies above volcanic rock that has shear wave velocities ranging from 246 m/s to 1415 m/s. Single-station microtremor data modelling on 189 sites revealed that the soil thickness varies between 2 m and 62 m. The calculated site amplification of the research area ranges from 1 to 2.4 times, indicating that the Cugenang, Warungkondang, and Cilaku regions have significant amplification zones. Historical records showed that the highest shaking intensity in the three regions ranged from VII to VIII of the MMI scale. Keywords: site amplification, soft surface layer, array microtremor, single station microtremor  
Visualisasi Data Elemen Jejak Granitik untuk Analisis Tatanan Tektonik Menggunakan Aplikasi Berbasis Web Febian, Herru Sendia; Ismed, Khaidir
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 4 (2025)
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i4.935

Abstract

Komposisi elemen jejak dari batuan granitik dapat digunakan untuk mengetahui evolusi tektonik batuan. Salah satunya adalah dengan menggunakan unsur Rb, Y, Nb, dan Ta seperti yang dilakukan oleh Pearce dkk. (1984) menggunakan diagram Rb vs (Y+Nb) dan Rb vs (Yb+Ta). Untuk menghasilkan plotting nilai elemen jejak pada diagram diskriminasi, peneliti geokimia menggunakan perangkat lunak desktop (contoh: GCDKit, PetroGraph, GeopyTool, dll.). Namun demikian, software tersebut menghasilkan diagram statis yang memiliki banyak kelemahan fleksibilitas diantaranya yaitu tidak dapat membandingkan beberapa data secara langsung, tidak dapat mengelompokkan data secara langsung dan penggunaan diagram scatter plot yang terbatas. Perangkat lunak geokimia semestinya dapat memberikan keleluasaan bagi ahli geokimia untuk dapat secara fleksibel mangatur visualisasi data sehingga hasil interpretasi yang dihasilkan juga tidak terbatas pada satu visualisasi data saja. Aplikasi berbasis web yang dibangun dengan Node.js, MySQL dan D3.js dapat menampilkan visualisasi diagram Pearce dkk. yang lebih interaktif dan lebih dinamis dengan menggunakan contour density selain penggunaan titik-titik plot. Visualisasi data yang lebih fleksibel pada aplikasi berbasis web dapat membantu ahli geokimia dalam menentukan outlier data, korelasi antar data dan evolusi geokimia dari arah sebaran data yang terlihat lebih jelas. Kata Kunci: granit, analisis data geokimia, diagram diskriminasi tektonik, aplikasi web. Abstract The trace element composition of granitic rocks can be used to determine the tectonic evolution of those rocks. One method involves using the elements Rb, Y, Nb, and Ta, as demonstrated by Pearce et al. (1984) using Rb vs. (Y+Nb) and Rb vs. (Yb+Ta) diagrams. To plot trace element values on discrimination diagrams, geochemical researchers typically use desktop software (e.g., GCDKit, PetroGraph, GeopyTool, etc.). However, these softwares produce static diagrams with several flexibility limitations, such as the inability to compare multiple datasets directly, the inability to group data on the fly, and the restricted use of scatter plots. Geochemical software should ideally provide geochemists with the freedom to flexibly manage data visualization so that interpretations are not limited to a single view. A web-based application built with Node.js, MySQL, and D3.js can display Pearce et al. diagrams that are more interactive and dynamic, utilizing contour density alongside traditional scatter plots. More flexible data visualization in a web application can assist geochemists in identifying data outliers, correlations, and geochemical evolution through more clearly visible data distribution trends. Keywords: granite, geochemical data analysis, tectonic discrimination diagram, web application  

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