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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 486 Documents
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Inventarisasi Keragaman Geologi Daerah Mawasangka Timur, Kabupaten Buton Tengah, Provinsi Sulawesi Tenggara Hasria, Hasria; Hamid, Fanul; Okto, Ali; Muliddin, Muliddin; Masri, Masri; Arisona, Arisona; Harisma, Harisma; Ngkoimani, La Ode; Sawaludin, Sawaludin; Salihin, La Ode Muhammad Iradat
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 3 (2025): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i3.852

Abstract

Fenomena geologi yang berhubungan dengan aspek bentang alam di daerah Mawasangka Timur, Kabupaten Buton Tengah, Provinsi Sulawesi Tenggara mempunyai fitur yang beragam dan secara umum disusun oleh satuan batugamping Formasi Wapulaka yang berumur Pleistosen. Penelitian ini bertujuan untuk menginventarisasi potensi keragaman geologi (geodiversity) yang mendasarkan pada aspek bentang alam karst dan pantai. Fitur keragaman geologi di kawasan karst mencakup baik gejala endokarst seperti gua dan ragam jenis hiasan gua di dalamnya maupun gejala exokarst seperti bukit pepino, dolina, dan akumulasi air di lekuk dolina yang membentuk danau. Di kawasan pantai terjadi sedimentasi pasir putih di pantai landai yang penyebarannya membentuk spit, serta undak-pantai, stack, notches dan sea-cave. Aneka fitur fenomena geologi yang terinvetarisasi tersebut didukung oleh struktur geologi. Metode penelitian yang digunakan adalah melakukan inventarisasi melalui pemetaan keragaman geologi, yaitu berupa pengambilan data lapangan meliputi, litologi, geomorfologi, dan struktur geologi, yang dilengkapi informasi titik koordinat lokasi dan potret). Keragaman geologi tersebut tersebar di seluruh wilayah penelitian, terutama di bagian selatan dan timur.   Kata Kunci: Keragaman geologi, Wapulaka, karst, dolina, gua, Mawasangka Timur.     Abstract- Geological phenomena related to landscape aspects in the East Mawasangka area, Central Buton Regency, Southeast Sulawesi Province have diverse features, which mainly composed of limestones unit of the Pleistocene Wapulaka Formation. This study aims to inventory the potential of geological diversity based on aspects of karst and coastal landscapes. Features of geological diversity in karstic areas include both endokarst phenomena such as caves and various types of cave decoration as well as exokarst phenomena such as pepino hills, doline, and water accumulation in doline depression that form lakes. In the coastal area, white sand sedimentation occurs on sloping beaches that spread to form spits, as well as coastal terraces, stacks, notches, and sea caves. The various features of the inventoried geological phenomena are supported by geological structures. The research method used was to conduct an inventory through geological diversity mapping, in the form of field data collection (lithology, geomorphology, geological structure, location coordinates, and portraits). The geological diversity is spread throughout the study area, especially in the south and east.   Keywords: Geodiversity, Wapulaka, karst, doline, cave, East Mawasangka.
Geologi Daerah Iha – Luhu, Kecamatan Huamual, Kabupaten Seram Bagian Barat, Provinsi Maluku Samalehu, Herfien; Idrus, Arifudin; Setiawan, Nugroho Imam
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 3 (2025): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i3.941

Abstract

Daerah Iha – Luhu terletak di Provinsi Maluku tepatnya pada wilayah Kecamatan Huamual Kabupaten Seram Bagian Barat. Wilayah penyelidikan berada pada koordinat 128o0’35” s.d 128o02’42” Bujur Timur dan 3o20’40” – 3o22’05” Lintang Selatan. Tujuan dilakukannya pemetaan geologi pada wilayah ini adalah untuk mendapatkan keadaan geologi wilayah penelitian khususnya menyangkut kondisi geomorfologi, stratigrafi serta struktur geologi. Metodologi penelitian menggunakan studi literatur, penelitian lapangan, analisa laboratorium serta menggunakan peta Digital Elevation Model (DEM). Berdasarkan kegiatan penelitian bahwa kondisi geomorfologi di wilayah penelitian mencakup dua satuan morfologi yang terdiri dari satuan dataran rendah dan satuan perbukitan rendah berlereng sangat landai – curam. Tatanan stratigrafi di Iha – Luhu terbagi menjadi tiga satuan dimana terdiri atas satuan filit kuarsa - muskovit, satuan metabatupasir kuarsa – muskovit, dan endapan aluvium. Struktur geologi yang berkembang merupakan lipatan antiklin di utara timur laut Bukit Tembaga. Hal ini ditunjukkan dengan kemiringan foliasi batuan sebesar 25o - 64o yang berarah timur laut – barat daya dengan sudut kemiringan landai - curam. Secara umum struktur sesar dan liniasi yang berarah timur laut – barat daya dan tenggara – barat laut terbentuk pada periode waktu yang sama. Kata kunci: Iha - Luhu, pemetaan geologi, geomorfologi, stratigrafi, struktur geologi. Abstract Iha – Luhu area is located in Maluku Province, precisely in the Huamual District, Western Seram Regency. Geographically, it is occupied at coordinates 128o0’35” to 128o02’42” East Longitude and 3o20’40” – 3o22’05” South Latitude. The purpose of geological mapping in this area is to obtain geological conditions of the research area regarding geomorphological conditions, stratigraphy and geological structures. The research methodology used literature studies, field research, laboratory analysis and a Digital Elevation Model (DEM) map. Based on research activities, the geomorphological conditions in the research area include two morphological units consisting of lowland units and low hill units with very gentle to steep slopes. The stratigraphic unit in Iha – Luhu is divided into three units consisting of quartz – muscovite meta-sandstone units, quartz – muscovite phyllite units and alluvium. The geological structure that developed in this area is an anticline fold in the northeast of Bukit Tembaga. This is indicated by a 25o– 64o slope of rock foliation that trends northeast-southwest with a gentle to steep slope angle. In general, fault structure and lineation trending NE-SW and SE-NW are formed in the same time period.Keywords: Iha – Luhu, geological mapping, geomorphology, stratigraphy, geology structure. Keywords: Iha – Luhu, geological mapping, geomorphology, stratigraphy, geology structure.
Analisis Deformasi Permukaan akibat Gempabumi pada 28 September 2018 di Kota Palu menggunakan Metode DInSAR dan Hubungannya dengan Sebaran Vs30 Saadia, Aprilia Ode; Purba, Joshua; Hasria, Hasria; Jaya, LM. Golok; Pertiwi, Imanuela Indah; Djibran, Halis M.
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 3 (2025): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i3.967

Abstract

Penelitian ini dilatarbelakangi oleh kejadian deformasi yang terjadi akibat gempabumi pada 28 September 2018 di Kota Palu. Penelitian ini bertujuan untuk mengetahui nilai deformasi akibat gempa M 7,4 di Kota Palu 2018 dan mengetahui hubungan deformasi dengan Vs30. Penggunaan metode DInSAR digunakan untuk mengetahui perubahan deformasi yang terjadi akibat gempa tersebut dengan menggunakan data sentinel 1A pada tanggal 07 Juni 2018 (sebelum gempa) dan 22 November 2018 (sesudah gempa). Hasil penelitian menunjukkan adanya penurunan (subsidence) hingga 23 cm dan pengangkatan (uplift) hingga 13 cm di wilayah Kota Palu. Wilayah dengan nilai Vs30 rendah cenderung mengalami penurunan akibat tanah lunak, sedangkan wilayah dengan nilai Vs30 tinggi cenderung mengalami kenaikan akibat tanah keras. Namun demikian, terjadi anomali pada wilayah Kecamatan Ulujadi dan Kecamatan Palu Selatan. Penggunaan data Vs30 menunjukkan bahwa nilai Vs30 dapat digunakan sebagai indikator awal untuk memprediksi area dengan potensi deformasi akibat gempa. Hal tersebut penting untuk pengembangan strategi mitigasi bencana, misalnya dalam penentuan zona aman untuk pembangunan. Kata Kunci: Deformasi, Metode DInSAR, Sentinel 1A, Vs30Kota Palu Abstract This research is motivated by the deformation event that occurred due to the earthquake on September 28, 2018 in Palu City. This research aims to determine the value of deformation due to the M 7.4 earthquake in Palu City in 2018, and to determine the relationship between deformation and Vs30. The DInSAR method was used to determine the deformation changes due to the earthquake using Sentinel 1A data on June 07, 2018 (pre-earthquake) and November 22, 2018 (post-earthquake). The analysis results showed subsidence of up to 23 cm and uplift of up to 13 cm in the city of Palu. Areas with low Vs30 values tend to experience subsidence due to soft soils, whereas areas with high Vs30values tend to experience uplift due to hard soil. However, anomalies occurred in Ulujadi and South Palu subdistricts. The use of Vs30data shows that Vs30valuescan be used as an early indicator to predict areas with potential earthquake-induced deformation. It is important for the development of disaster mitigation strategies, such as determining safe zones for development. Keywords: Deformation, DInSAR method, Sentinel 1A, Vs30, Palu City
Clay Mineral Characteristics of the Damar Formation in the Southern Part of the Coastal Area of Semarang and Kendal, Central Java Wafid A.N., Muhammad; Zajuli, Moh. Heri Hermiyanto; Suyono, Suyono; W, Hermawan; Irzon, Ronaldo
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 3 (2025): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i3.997

Abstract

The study area is located in the southern part of the Coastal area of Semarang and Kendal, Central Java. The fine-grained sedimentary rocks of Damar Formation comprise tuffaceous mudstones, volcanic breccias, sandstones, tuffs and conglomerates; with occasional lava deposits and volcanic materials within alluvial fan deposits. The purpose of this study is to provide data on the characteristics of fine-grained sedimentary rocks of the Damar Formation including physical characteristics, diagenesis processes, and their implications for the history of rock accumulation. Based on Scanning Electron Microscope (SEM) analysis of four claystone samples from the Damar Formation consist of illite (K1-1.5 Al4 (Si7 6.5 Al1-1.5 O20 )(OH)4 , mixed illite (K1-1.5 Al4 (Si7-6.5 Al1-1.5 O20 ) (OH)4 - smectite (1/2Ca)0.7 (Al,Mg,Fe)4 (Si,Al)8 O20 ).nH2 O and kaolinite (Al4 (Si4 O10 )(OH)8 . Other minerals include silica or quartz fractions and feldspar. Kaolinite is the most prominent clay mineral identified in all claystone samples analysed, although the clay textures seem to be irregular shapes of Damar Formation has undergone a diagenetic process within a mesodiagenetic level indicating sediment burial at depths of 2,500–4,000 m by temperature ranging from 80° to 120°C. Keywords: Damar Formation, SEM, diagenesis, clay mineral, illite Abstrak Area studi terletak di bagian selatan pantai Semarang dan Kendal, Jawa Tengah. Sedimen berbutir halus dari Formasi Damar terdiri dari batulumpur tufaan, breksi vulkanik, batupasir, tuf, dan konglomerat, dengan setempat deposit lava dan material volkanik dengan endapan kipas aluvial. Tujuan dari studi ini adalah untuk menyediakan data terkait karakteristik dari batuan sedimen berbutir halus dari formasi Damar termasuk karakter fisik, proses diagenesis, dan implikasinya untuk sejarah akumulasi batuan. Berdasarakan Mikroskop Scanning Elektron (SEM) analisis dari 4 (empat) percontoh batulempung Formasi Damar terdiri dari illit (K1-1.5 Al4 (Si7-6.5 Al1-1.5 O20 ) (OH)4 , campuran illit (K1-1.5 Al4 (Si7-6.5 Al1-1.5 O20 )(OH)4 - smektit (1/2Ca)0.7 (Al,Mg,Fe)4 (Si,Al)8 O20 ).nH2 O dan kaolinit (Al4 (Si4 O10 )(OH)8 . Mineral lainnya adalah silika atau kuarsa berupa fraksi, felspar. Mineral lempung kaolinit merupakan mineral lempung yang paling menonjol dari analisis batu lempung, meskipun tekstur lempungnya berbentuk kurang teratur yang menandakan proses diagenesis pada level mesodiagenesis yang pernah terpendam sampai 2500 – 4000 meter dengan temperatur berkisar 80o – 120o. Kata kunci: Formasi Damar, SEM, diagenesis, mineral lempung, illit  
Sejarah dan Proyeksi Masa Depan Pemanfaatan Nikel Indonesia Irzon, Ronaldo; Hermiyanto, Heri; Rizkika, Ollybinar; Tardeli, Alles Sandra
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 3 (2025): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i3.975

Abstract

Nikel adalah salah satu sumber daya mineral unggulan Indonesia dan merupakan logam yang berperan strategis dalam industri global. Studi ini bertujuan untuk membahas sejarah, kondisi terkini, serta proyeksi masa depan industri nikel di Indonesia. Terdapat dua tipe endapan nikel, yaitu sulfida dan laterit. Nikel di Indonesia didominasi oleh tipe laterit yang tersebar luas di Sulawesi, Halmahera, dan Papua. Eksplorasi nikel di bumi Nusantara telah dimulai sejak tahun 1901. Oost Borneo Maatschappij dan Bone Tole Maatschappij adalah perusahaan yang melakukan eksplorasi nikel ketika masa kolonial. Pasca kemerdekaan, PT INCO dan PT Aneka Tambang berperan penting dalam eksploitasi logam tersebut. Kebutuhan global untuk industri baja tahan karat dan baterai kendaraan listrik mendorong peningkatan produksi nikel Indonesia sejak tahun 2017. Pemerintah telah menerapkan kebijakan hilirisasi dan larangan ekspor bahan mentah untuk meningkatkan nilai tambah industri nikel domestik. Dengan cadangan nikel terbesar secara global, Indonesia berpeluang untuk menjadi pemain kunci industri nikel pada masa mendatang. Indonesia perlu mengoptimalkan pemanfaatan metal companions sambil terus mengontrol kemungkinan pencemaran lingkungan akibat industri pertambangan dan pengolahan nikel. Sinergi antara pemerintah, pelaku industri, dan masyarakat menjadi kunci keberhasilan pemanfaatan nikel Indonesia. Kata Kunci: Nikel, Indonesia, laterit, metal companions, hilirisasi   Abstact Nickel is one of Indonesia’s leading mineral resources and plays a strategic role in the global industry. This study aims to discuss the history, current conditions, and future projections of the nickel industry in Indonesia. There are two types of nickel deposits: sulfide and laterite. Indonesia’s nickel is predominantly of the laterite type, which is widely distributed in Sulawesi, Halmahera, and Papua. Nickel exploration in the archipelago began in 1901. Oost Borneo Maatschappij and Bone Tole Maatschappij were companies conducting nickel exploration during the colonial era. After independence, PT INCO and PT Aneka Tambang played significant roles in the exploitation of the metal. The global demand for the stainless steel and electric vehicle battery industries has driven Indonesia’s nickel production growth since 2017. The government has implemented downstream processing policies and export bans on raw materials to increase the added value of the domestic nickel industry. With the world’s largest nickel reserves, Indonesia has the potential to become a key player in the nickel industry in the future. Indonesia needs to optimize the utilization of metal companions while continuously controlling the potential environmental pollution caused by nickel mining and processing industries. Synergy between the government, industry players, and the public is essential for the successful utilization of Indonesia’s nickel. Keywords: Nickel, Indonesia, laterite, metal companions, downstream
Identifikasi Karakteristik Zona Prospek Timah Primer Berdasarkan Pemetaan Geologi Permukaan dan Analisis Geokimia Daerah Kelapakampit dan Sekitarnya, Kabupaten Belitung Timur, Provinsi Bangka Belitung Noorbasith Al Fajri; Putranto, Thomas Triadi; Ali, Rinal Khaidar
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 2 (2025): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i2.823

Abstract

Kepulauan Bangka Belitung memiliki potensi timah yang besar baik timah primer dan timah sekunder. Akan tetapi timah primer belum dimanfaatkan secara optimal dibandingkan timah sekunder sehingga perlu dilakukan penelitian secara lebih lanjut. Penelitian ini dilakukan di Kelapakampit dan sekitarnya, Kabupaten Belitung Timur. Tujuan dari penelitian ini yaitu. mengetahui kondisi geologi dan zona prospek endapan timah primer di daerah penelitian. Metode penelitian yang dilakukan yaitu pemetaan geologi permukaan, analisis geomorfologi, struktur geologi, petrologi, petrografi, mineragrafi, X-Ray Difraction (XRD), dan X-Ray Fluorescence (XRF). Berdasarkan hasil analisis diketahui geomorfologi daerah penelitian terdiri dari berbukit bergelombang-berbukit terjal struktural dan bergelombang miring-landai struktural. Daerah penelitian terdiri dari 2 satuan litologi yaitu metabatupasir dan batupasir. Struktur yang berkembang di daerah penelitian berupa kekar tarik, kekar gerus, kelurusan, dan indikasi sesar. Tipe alterasi hidrotermal di daerah penelitian termasuk kedalam eksogreisen dan argilisisasi. Mineralisasi yang berkembang di daerah penelitian termasuk dalam tipe endapan urat kuarsa-kasiterit dan sulfida-kasiterit. Mineralisasi timah dicirikan dengan hadirnya mineral kasiterit yang berasosiasi dengan beberapa mineral sulfida. Berdasarkan analisis geokimia XRF, nilai Sn pada sampel batuan menunjukkan rentang dari 115,5-727,7 ppm dan sampel streams sediment menunjukkan rentang 51 130.800 ppm. Zona prospek timah primer terdapat pada bagian tengah dan barat laut daerah penelitian. Ditemukan anomali Pb dengan rentang 5.080 - 173.590 ppm dan Zn dengan rentang 1.680 - 2.040 ppm. Kata Kunci: Belitung, Timah Primer, Mineralisasi, Zona Prospek Abstract The Bangka Belitung Islands have great tin potential, both primary and secondary tin. However, primary tin has not been utilized optimally compared to secondary tin, so further research is needed. This research was conducted in Kelapakampit and its surroundings, East Belitung Regency. The purpose of this study is to determine the geological conditions and the prospective zones of primary tin deposits in the study area. The research methods applied include surface geological mapping, geomorphological analysis, geological structure studies, petrology, petrography, mineragraphy, X-Ray Diffraction (XRD), and X-Ray Fluorescence (XRF). Based on the analysis results, it is known that the geomorphology of the study area consists of rolling hills to steep structural hills and gently sloping structural undulating areas. The study area consists of 2 lithology units, namely metasandstone and sandstone. The structures developed in the study area include tension joints, shear joints, lineaments, and indications of faults. The types of hydrothermal alteration in the study area include exogreisen and argillization. Mineralization developed in the study area belongs to the type of quartz-cassiterite vein deposits and cassiterite-sulfide deposits. Tin mineralization is characterized by the presence of cassiterite mineral associated with several sulfide minerals. Based on XRF geochemical analysis, Sn values in rock samples range from 115.5–727.7 ppm, and stream sediment samples range from 51–130,800 ppm. The primary tin prospect zone is located in the central and northwest parts of the study area. An anomaly of Pb was found with a range of 5.080 - 173.590 ppm and Zn with a range of 1.680 - 2.040 ppm. Keywords: Belitung, Primary Tin, Mineralization, Prospect Zone
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
Characteristics of Ore-Bearing Vein in Banyuresmi, Cigudeg District, West Java Province: Constraints from Geological, Alteration, and Mineralization Aspects Alamudi, Ali Rifqi `; Rizkyafdhal, Mochamad Risyad; Firdaus, Muhammad Bintang; Fatimah, Dian Yesy; Wahjoedi, Dimas Setya Kusuma
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 2 (2025): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i2.902

Abstract

The study area of the ore-bearing vein system is located in Banyuresmi, Cigudeg District, ±13.6 km from the Gunung Pongkor deposits or ±45 km from Jakarta. The ore-bearing veins system is being operated by smallscale and traditional gold mines. Up to now, no peerreviewed papers have been published on the geological conditions and ore characteristics in this area. This study aims to determine the distribution of lithology, geological structure, alteration zonation, and the mineralization characteristics of ore-bearing veins in the Banyuresmi area. To achieve the objectives, several research methods were employed, grouped into fieldwork (rock/vein sampling and geological structures measurement) and laboratory analysis (6 rock samples for petrography and 6 vein samples for ore microscopy). The results of this study indicate that the stratigraphy of the study area consists of porphyritic andesite units, which are overlain by lapilli tuff units and then followed by the formation of colluvial units. The geological structures that develop in the area of study, represented by normal faults, strike-slip faults, and thrust faults, are produced from the average value of maximum stress (σ1) for all tectonic phases, which have trend values of N32°E and N210°E (NE-SW). Hydrothermal alteration in the Banyuresmi vein system is divided into three zones: propylitic (chl-sm±ser±cb), argillic (il±kao), and silicification (qz). Mineralization in the area of study is dominated by ore minerals such as galena, sphalerite, pyrite, chalcopyrite, digenite, covellite, bornite, hematite, and pyrrhotite. These ore minerals are found in veins with quartz and quartz-clay composition, which consist of various textures including crustiform-colloform, massive, comb, zoning, dogteeth, cockade, etc. The veins are estimated to have varying orientations, including NW-SE, E-W, and NE-SW. Based on the characteristics of this study, the Banyuresmi ore vein system shows a propensity to be a low sulfidation epithermal system deposit type. Keywords: Ore-bearing vein, low sulfidation epithermal, hydrothermal alteration, Banyuresmi, West Java   Abstrak Sistem urat pembawa bijih ini terletak ±13.6 km dari endapan Gunung Pongkor atau ±45 km dari Jakarta. Sistem urat pembawa bijih ini dioperasikan oleh tambang emas skala kecil dan tradisional. Hingga saat ini, belum ada publikasi makalah yang memuat kondisi geologi terkait karakteristik urat pembawa bijih di daerah tersebut. Studi ini bertujuan untuk mengetahui persebaran litologi, struktur geologi, dan zonasi alterasi, serta menentukan karakteristik mineralisasi dari urat pembawa bijih di daerah Banyuresmi. Untuk mencapai tujuan tersebut, digunakan beberapa metode penelitian yaitu pekerjaan lapangan (pengambilan sampel, dan pengukuran kedudukan struktur geologi) dan analisis laboratorium (analisis petrografi pada 6 sampel batuan serta analisis mineragrafi pada 6 sampel urat). Hasil dari penelitian ini menunjukkan bahwa stratigrafi daerah penelitian terdiri dari Satuan Andesit Porfiritik yang ditindih oleh Satuan Lapili Tuf dan kemudian disusul oleh terbentuknya Satuan Koluvial. Struktur geologi yang berkembang pada daerah penelitian berupa sesar normal, sesar geser, dan sesar naik dihasilkan dari harga rata-rata tegasan maksimum (σ1) seluruh fase tektonik yang memiliki nilai tren N32°E dan N210°E (NE-SW). Alterasi hidrotermal pada sistem urat Banyuresmi terbagi kedalam tiga zona yaitu propilitik (chl-sm±ser±cb), argilik (il±kao), dan silisifikasi (qz). Mineralisasi daerah penelitian didominasi oleh mineral bijih seperti galena, sfalerit, pirit, kalkopirit, digenit, kovelit, bornit hematit, dan pirhotit. Mineral bijih tersebut dijumpai pada urat kuarsa dan kuarsa-lempung yang terdiri dari berbagai macam tekstur mencakup crustiform-colloform, masif, comb, zoning, dogteeth, cockade, dll. Urat-urat tersebut diperkirakan memiliki orientasi yang bervariasi, yaitu NW-SE, E-W, dan NE-SW. Berdasarkan karakteristik pada penelitian ini, sistem urat bijih Banyuresmi menunjukkan adanya kecenderungan sebagai tipe endapan sistem epitermal sulfidasi rendah. Kata Kunci: Urat pembawa bijih, epitermal sulfidasi rendah, alterasi hidrotermal, Banyuresmi, Jawa Barat
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  
Pemetaan Sebaran Spasial Potensi Panas Bumi Daerah Suoh Menggunakan Metode Analytical Hierarchy Process (AHP) Astri Niken Saputri; I Gede Boy Darmawan; Karyanto; Nandi Haerudin; Ordas Dewanto
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 2 (2025): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i2.940

Abstract

Panas bumi adalah salah satu bentuk energi terbarukan dengan besar potensi sebesar 28.5 GW di Indonesia. Suoh diduga sebagai salah satu daerah dengan potensi panas bumi di Indonesia yang dicirikan dengan kemunculan manifestasi panas bumi berupa fumarola dan mata air panas. Penelitian ini bertujuan untuk mengklasifikasi parameter input penelitian dan menganalisis daerah berpotensi panas bumi tinggi. Metode Analytical Hierarchy Process (AHP) menjadi salah satu metode yang telah digunakan penelitian terdahulu dalam menganalisis potensi panas bumi suatu daerah. Pada penelitian ini digunakan parameter geosains berupa geologi, manifestasi, alterasi hidrotermal, suhu permukaan, kerapatan kelurusan, dan anomali gaya berat. Bobot tiap parameter ditentukan dari metode AHP dan hasilnya dilakukan pembobotan overlay. Peta potensi panas bumi daerah Suoh diklasifikasikan menjadi 4 kelas, yaitu potensi panas bumi rendah, sedang, tinggi, dan sangat tinggi. Daerah dengan potensi panas bumi tinggi tersebut berada pada daerah didekat manifestasi dengan jenis batuan vulkanik, memiliki densitas kelurusan yang cenderung tinggi, merupakan daerah dengan alterasi, suhu permukaannya tinggi, anomali residual cenderung sedang hingga sangat tinggi. Daerah berpotensi panas bumi tinggi berkorelasi dengan 8 titik manifestasi panas bumi di daerah penelitian. Kata Kunci:  panas bumi, potensi, analytical hierarchy process (AHP), analisis spasial Abstract- Geothermal heat is one of the forms of renewable energy with a substantial potential of 28.5 GW in Indonesia. Suoh is suspected to be one of the areas with geothermal potential in Indonesia, characterized by the occurrence of geothermal manifestations in the form of fumaroles and hot springs. This study aims to classify the research input parameters and analyze areas with high geothermal potential. The Analytical Hierarchy Process (AHP) method is one of the techniques previously used in analyzing the geothermal potential of an area. In this study, geological parameters such as geology, manifestations, hydrothermal alteration, surface temperature, lineament density, and gravity anomalies were used. The weight of each parameter was determined using the AHP method, and the results were subjected to overlay weighting. The geothermal potential map of the Suoh area was classified into 4 classes: low, moderate, high, and very high geothermal potential. Regions with high geothermal potential are located near manifestations, characterized by volcanic rock types, a tendency for high lineament density, areas with alteration, high surface temperatures, and moderate to very high residual anomalies. High geothermal potential areas correlate with 8 geothermal manifestation points in the research area. Keywords: geothermal, potential, Analytical Hierarchy Process (AHP), spatial analysis

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