https://jgsm.geologi.esdm.go.id/index.php/JGSM <p><strong>Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)</strong> is an Indonesian scientific journal published by the Center for Geological Survey, Geological Agency, Ministry of Energy and Mineral Resources. The journal receives Indonesian or English articles. Those articles are selected and reviewed by our professional editors and peer reviewers.</p> <p>JGSM has been assigned as an Accredited Scientific Periodical Magazine by the Indonesian Institute of Sciences (LIPI) No. 596/Akred/P2MI-LIPI/03/2015 in 2015, followed by Kementerian Riset dan Teknologi / Badan Riset dan Inovasi Nasional No. 200/M/KPT/2020 in 2020. The journal is indexed in <a title="portal_garuda_IPI" href="http://id.portalgaruda.org/?ref=browse&amp;mod=viewjournal&amp;journal=10104" target="_blank" rel="noopener">Indonesian Publication Index (IPI)</a>, <a title="isjd" href="http://isjd.pdii.lipi.go.id/index.php/public_no_login/index_direktori" target="_blank" rel="noopener">Indonesian Scientific Journal Database (ISJD)</a>, <a href="http://dx.doi.org/10.33332">Digital Object Identifier (DOI)</a> and <a title="google_scholar" href="https://scholar.google.co.id/citations?user=nXMHIYUAAAAJ&amp;hl=en" target="_blank" rel="noopener">Google Scholar</a>, the contents are freely available in electronic version. JGSM is published quarterly in February, May, August, and November.</p> <p><a title="issn" href="http://issn.pdii.lipi.go.id/issn.cgi?daftar&amp;1402376294&amp;1&amp;&amp;" target="_blank" rel="noopener"><strong>ISSN : 0853-9634 (print)</strong></a></p> <p><a title="eissn" href="http://issn.pdii.lipi.go.id/issn.cgi?daftar&amp;1485227549&amp;1&amp;&amp;" target="_blank" rel="noopener"><strong>e-ISSN : 2549-4759 (online)</strong></a></p> <p><strong><em><strong>DOI Prefix: </strong></em><a title="JGSM" href="https://doi.org/10.33332">https://doi.org/10.33332</a><br /></strong></p> Pusat Survei Geologi en-US Jurnal Geologi dan Sumberdaya Mineral 0853-9634 <p>Authors who publish articles in <strong>Jurnal Geologi dan Sumberdaya Mineral (JGSM.Geologi)</strong> agree to the following terms:</p><ol><li>Authors retain copyright of the article and grant the journal right of first publication with the work simultaneously licensed under a <strong>CC-BY-NC</strong> or <strong>The Creative Commons Attribution–ShareAlike License.</strong></li><li>Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.</li><li>Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See <a href="http://opcit.eprints.org/oacitation-biblio.html" target="_blank">The Effect of Open Access</a>)</li></ol> https://jgsm.geologi.esdm.go.id/index.php/JGSM/article/view/806 <p>Dua buah rembesan minyak bumi diambil dari daerah Torete, Morowali, Provinsi Sulawesi Tengah. Kedua sampel rembesan telah dilakukan analisis GC (gas chromatography) dan GCMS (gas chromatography and mass spectometry). Analisis geokimia biomarker dilakukan untuk mengetahui karakter minyak bumi berupa asal material organik, lingkungan pengendapan, dan tingkat kematangan. Pada kromatogram alkana normal, kedua sampel menunjukkan satu puncak (unimodal) sebelum nC20 dengan rasio Pr/Ph 0,87 dan 0,92. Fragmentogram m/z 217 menunjukkan sedikit dominasi pada sterana C29 dibanding sterana C27 dan sedikit kehadiran dari diasterana. Fragmentogram m/z 191 menunjukkan adanya dominasi pada terpana trisiklik C23 dan terpana tetrasiklik C24 serta kehadiran terpana trisiklik C26+. Pada terpana pentasiklik menunjukkan dominasi Tm terhadap Ts, hopana C29 terhadap hopana C30, kehadiran seri norhopana C30 dan gamaserana, serta homohopana C35 yang sedikit lebih tinggi dari homohopana C34. Biomarker petunjuk tumbuhan tinggi (oleanana dan bikadinana) tidak hadir pada kedua sampel. Hal ini menunjukkan bahwa kedua sampel minyak bumi berasal dari batuan induk karbonat dengan material organik alga, plankton, radiolaria, atau diatom lingkungan pengendapan anoksik-suboksik (lingkungan transisional), dan tingkat kematangan awal matang sampai level matang.</p> <p>Katakunci: biomarker, GC, GCMS, Torete, Morowali, Sulawesi Tengah.</p> Achmad Fahruddin Eddy Ariyono Subroto Very Susanto Lauti Dwita Santy Ryandi Adlan Copyright (c) 2024 Achmad Fahruddin, Eddy Ariyono Subroto, Very Susanto, Lauti Dwita Santy, Ryandi Adlan http://creativecommons.org/licenses/by-nc/4.0 2024-11-04 2024-11-04 25 4 205 216 10.33332/jgsm.geologi.v25i4.806 https://jgsm.geologi.esdm.go.id/index.php/JGSM/article/view/827 <p>Kendal Area in Central Java experiences rapid regional geology development. A wide flat area extending towards the Pantura, approximately 40 km wide and 20 km long, is influenced by the Bodri River. The Kendal basin formation is driven by Java’s regional compression tectonics. Major faults show the east-west direction as thrust faults and northeast-southwest direction as strike slip faults correspond to Java’s Regional Structures. Active and passive satellite imagery reveals geomorphic features such as deltas, coastal deposits, paleochannels, break slopes as faults zone, and topographic offsets of the area. The drainage pattern varies with deposit types: distributary channels in the north, meandering channels in the middle, and tributary channels in the south. Fusion image of Landsat 8 and National Digital Elevation Model (DEMNAS) produced by Badan Informasi Geospasial Indonesia (BIG) highlight distinct topographical boundaries and slopes. Residual gravity data shows subsurface contrasts, indicating dominant directions related to surface faults. Other supporting data used include magnetic anomaly imagery processed using the Reduce to Pole (RTP) method which are used to position the source of magnetic anomalies directly above their actual subsurface location. The RTP results enable more accurate interpretation of the distribution and depth of subsurface magnetic sources. The magnetic RTP model aligns with imagery, exhibiting east-west, northeast-southwest, and northwest-southeast trends. This structural interpretation is substantiated by field validation, with evidence of fault cliffs, lithologic offset, fault planes, mylonitization, and fault breccias corroborating the findings.</p> <p>Keywords: Bodri River, gravity, Kendal, landsat 8, Java’s regional structures, magnetic anomaly. </p> Jamal Jamal Indra Sanjaya Dian Hari Saputro Aji Suteja Copyright (c) 2024 Jamal Jamal, Indra Sanjaya, Dian Hari Saputro, Aji Suteja http://creativecommons.org/licenses/by-nc/4.0 2024-11-08 2024-11-08 25 4 217 223 10.33332/jgsm.geologi.v25i4.827 https://jgsm.geologi.esdm.go.id/index.php/JGSM/article/view/817 <p>Abstrak- Sebuah geopark harus memiliki warisan geologi di kawasannya, di mana warisan geologi itu boleh jadi memiliki potensi wisata yang perlu disinergikan dengan elemen lain penggerak ekonomi masyarakat. Geopark Silokek adalah salah satu kawasan pembangunan berkelanjutan di wilayah Provinsi Sumatra Barat. Tulisan ini bertujuan untuk menginventarisasi calon situs warisan geologi di dalam kawasan Geopark Silokek dan melakukan penilaian secara kuantitatif terhadap potensi geowisata situs tersebut. Studi ini menerapkan metode penilaian kuantitatif yang telah dipergunakan secara internasional. Nilai total potensi geowisata delapan calon geosite di Geopark Silokek berkisar 255-340 dari nilai maksimal 400. Lower Ombilin Sungai Rambutan disimpulkan sebagai calon geosite yang nilai potensi wisatanya paling rendah terutama karena aksesibilitasnya yang sulit, fasilitas keamanan yang kurang memadai, dan jaraknya yang jauh dari lokasi rekreasi lainnya. Komplek Karst Silokek dan Kompleks Intrusi Mambui adalah dua calon geosite dengan nilai potensi geowisata tertinggi karena didukung oleh fasilitas keselamatan, ketersediaan logistik, berpemandangan indah, kondisi pengamatan yang baik dan berada di dekat lokasi rekreasi lainnya. Potensi geowisata calon geosite di dalam Geopark Silokek perlu dikembangkan, sehingga keadaan sosial-ekonomi masyarakat setempat dapat meningkat.</p> <p>Kata Kunci: geosite, geowisata, geopark, Komplek Karst Silokek</p> Ronaldo Irzon Verry E.Setiawan Dida Yurnaldi Afdal Yulius Riecca Oktavitania Deswira Harneti Copyright (c) 2024 Ronaldo Irzon, Verry E.Setiawan, Dida Yurnaldi, Afdal Yulius, Riecca Oktavitania, Deswira Harneti http://creativecommons.org/licenses/by-nc/4.0 2024-11-25 2024-11-25 25 4 225 234 10.33332/jgsm.geologi.v25i4.817 https://jgsm.geologi.esdm.go.id/index.php/JGSM/article/view/792 <p>Abstrak-Skandium dan Unsur Tanah Jarang merupakan sumber daya strategis yang berharga untuk berbagai aplikasi industri sehingga menjadi perhatian untuk eksplorasi sumber daya, ekstraksi berkelanjutan, dan aplikasi pada pengembangan teknologi. Penelitian ini bertujuan untuk mengetahui karakteristik profil laterit beserta kandungan unsur skandium dan potensi UTJ yang berkembang pada profil laterit nikel yang memiliki batuan dasar ultrabasa. Daerah penelitian berada pada Daerah Wasile, Halmahera Timur. Dalam penelitian ini, metode yang digunakan adalah analisis petrologi dan analisis geokimia,yaitu XRF, ICP-MS dan XRD. Hasil dari analisis petrologi menunjukkan bahwa profil laterit terdiri atas lapisan limonit, zona transisi, saprolit dan batuan dasar. Batuan dasar yang teramati merupakan jenis lerzolite dan serpentinit. Hasil analisis geokimia menunjukkan peningkatan komposisi unsur skandium dan UTJ pada zona saprolit. Kehadiran unsur-unsur ini menjadi potensi untuk korelasi terkait dengan genesis UTJ Ion Adsorption Type dan klasifikasi deposit lebih lanjut.</p> <p>Katakunci: Halmahera, profil laterit, skandium, UTJ.</p> Aditya Fadhlurrohman Putrananda Mega Fatimah Rosana Euis Tintint Yuningsih Copyright (c) 2024 Aditya Fadhlurrohman Putrananda, Mega Fatimah Rosana, Euis Tintin Yuningsih http://creativecommons.org/licenses/by-nc/4.0 2024-11-26 2024-11-26 25 4 235 247 10.33332/jgsm.geologi.v25i4.792 https://jgsm.geologi.esdm.go.id/index.php/JGSM/article/view/872 <p>The presence of numerous oil and gas seeps along the Pamanukan-Cilacap Fault Zone of the Banyumas Basin. This indicate that the Banyumas Basin is an active petroleum system. However, oil and gas exploration in this area is complicated by extensive volcanic rocks from Paleogene to Recent Times. Thick volcanic covers are responsible for the poor seismic data quality and making subsurface imaging is difficult. Therefore, there is prospective sedimentary sequence beneath the volcanic rock as potential hydrocarbon resources in this basin. <br />This review will focus on geochemical and geophysical approach. Geochemical analysis was used to reveal petroleum generation underneath the volcanic cover. The combined geophysical methods, i.e. gravity, magnetotelluric and passive seismic tomography were applied to image subsurface sedimentary thickness and geology structure in this area. Biomarker analysis of oil seeps from study area indicates that the oil generation in the Banyumas Basin was derived from Late Cretaceous to Eocene sedimentary rocks which deposited in fluvial to deltaic environment. The gravity data delineation analysis shows two sedimentary sub basins, Majenang Sub Basin and Citanduy Sub Basin, a relatively northwest to southeast trends, correlates with the regional structural trend. These sub basins were also well determined from magnetotelluric data. The passive seismic tomography method enhancing the sub surface image. The Vp, Vs and Vp/Vs ratios can identify the sedimentary layer under the volcanic rocks, as well as geological structure feature within the basin. The flower structure and anticline structure are well imaged and could be the potential structural trap in the Banyumas Basin. Thus, this new insight provides opportunities for further petroleum exploration in this area.</p> <p>Keyword: Geochemistry, Banyumas Basin, passive seismic tomography, hydrocarbon potential</p> <p> </p> Asep Kurnia Permana R. Setiawan Marjiyono G.M. Lucki Junursyah Hidayat D. Yurnaldi E.Y.Patriani A. Setiawan Copyright (c) 2024 Asep Kurnia Permana, ST.,M.Sc., R. Setiawan, Marjiyono, G.M. Lucki Junursyah, Hidayat, D. Yurnaldi, E.Y.Patriani, A. Setiawan http://creativecommons.org/licenses/by-nc/4.0 2024-11-28 2024-11-28 25 4 249 257 10.33332/jgsm.geologi.v25i4.872 https://jgsm.geologi.esdm.go.id/index.php/JGSM/article/view/892 <p>Abstrak-Batuan vulkanik Pulau Ponelo terletak pada Kepulauan Ponelo di bagian utara Busur Utara Sulawesi yang mana asal usul mengenai batuan ini belum diketahui. Maka dari itu, penelitian ini bertujuan untuk mengetahui karakteristik petrografi dan geokimia unsur utama batuan vulkanik Pulau Ponelo yang belum pernah diidentifikasi sebelumnya. Metode penelitian menggunakan analisis mikroskopis (petrografi) dan geokimia (XRF). Batuan vulkanik Pulau Ponelo mrerupakan batuan andesit basaltik dengan beberapa tekstur, seperti porfiritik intergranular, glomeroporfiritik, seriate, serta berbagai tekstur mikro-plagioklas. Afinitas magma batuan vulkanik Pulau Ponelo berupa kalk-alkalin dengan terjadinya proses fraksinasi kristal, pencampuran magma, serta magma pada sistem magma plumbing berupa dekompresi adiabatik, konveksi, injeksi magma, serta degassing atau eksolusi air akibat peristiwa undercooling saat erupsi. Tatanan tektonik pembentukan batuan ini berupa zona subduksi busur kepulauan dengan karakteristik pengayaan fluida akibat adanya dehidrasi lempeng saat subduksi terjadi.</p> <p>Katakunci: Andesit basaltik Ponelo, busur kepulauan, Busur Utara Sulawesi.</p> Siti Chusnul Chatimah Nurahmah Mega Fatimah Rosana Iyan Haryanto Copyright (c) 2024 Siti Chusnul Chatimah Nurahmah, Mega Fatimah Rosana, Iyan Haryanto http://creativecommons.org/licenses/by-nc/4.0 2024-11-28 2024-11-28 25 4 259 268 10.33332/jgsm.geologi.v25i4.892