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All Journal Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Indonesian Journal of Earth Sciences
Gusti, Ugi Kurnia
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Agriculture, Biological Sciences & Forestry Chemistry Earth & Planetary Sciences Education Environmental Science Physics

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Kontrol Struktur Geologi Terhadap Distribusi Manifestasi Panas Bumi di Daerah Subang dan Sekitarnya, Kabupaten Kuningan, Provinsi Jawa Barat. Rastra, Rastra Yandra Satya Nugraha; Sutriyono, Edy; Gusti, Ugi Kurnia
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 4 (2025): November
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v6i4.1254

Abstract

The influence of geological structures on the distribution of geothermal manifestations in the Subang area and its surroundings, Kuningan Regency, West Java Province, was assessed through an integrated approach combining lineament analysis based on Digital Elevation Model (DEM) imagery, fault and fracture density mapping, surface temperature analysis using Landsat 8 imagery, and surface geological surveys. The results indicate that three main hot spring points are closely associated with high-density fracture zones and active thrust fault systems. The primary geological structures controlling the system include the Ci Monte Fault and Situ Gede Fault, as well as the Ci Monte Syncline and Pamulihan Anticline, all trending east–west and formed due to compressive stress oriented north–south and northeast–southwest. These faults and fractures are strongly inferred to serve as migration pathways for hydrothermal fluids from the reservoir to the surface. The alignment of geothermal manifestations with geological structures highlights the critical role of active fractures and faults as the main controlling factors in the geothermal system. This conclusion underscores that geological structures function not only as natural permeable conduits but also as key indicators in geothermal exploration, especially in tectonically active regions.
Mekanisme Pembentukan Struktur Geologi Daerah Ciwaru dan Sekitarnya, Kabupaten Kuningan, Jawa Barat Ramadhani, Jesica Nabilah; Sutriyono, Edy; Gusti, Ugi Kurnia
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 4 (2025): November
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v6i4.1305

Abstract

Daerah Ciwaru merupakan salah satu wilayah administratif di Kabupaten Kuningan Provinsi Jawa Barat. Penelitian ini bertujuan untuk mengidentifikasi keterkaitan arah tegasan (gaya) terhadap pembentukan struktur geologi berupa lipatan dan sesar dengan didukung data pemetaan geologi dan citra DEM. Pemetaan geologi didukung dengan Analisa data struktur geologi untuk menginterpretasikan struktur daerah penelitian. Satuan batuan pada Lokasi penelitian meliputi 3 formasi yaitu Formasi Rambatan (Tmr), Formasi Halang (Tmph), dan Anggota Gunung Hurip Formasi Halang (Tmhg). Pada daerah penelitian ditemukan struktur geologi berupa Sinklin Lebakherang, Antiklin Sumberjaya, Antiklin Ciwaru, Sinklin Dukuh Picung, Sinklin Jalatrang, Antiklin Cipakem. Sesar Cipakem, Sesar Sagaranten, Sesar Cikalong, Sesar Ci Golok dan Sesar Ci Honje. Data yang telah dikumpulkan dilakukan analisa struktur software Win tensor dan dips guna mengetahui gambaran struktur geologi di daerah penelitian, dan di intregasikan dengan kenampakan pada peta Digital Elevation Model (DEM). Berdasarkan hasil dan analisis didapatkan 7 lipatan membentuk orientasi Barat – Timur (Orde 1) akibat kompresional Utara – Selatan dan membentuk 2 struktur sesar dengan Orde 1 yaitu Sesar Cipakem dan Sesar Ci Golok. Selanjutnya terbentuk Sesar Sagaranten (Orde 1) akibat dari gaya tensional yang berarah Timur Laut – Barat Daya. Terdapat secondary stress berarah Barat Baratlaut - Timur Tenggara sehingga membentuk sesar orde 2 yaitu Sesar Kalong dan Sesar Ci Honje.
Mekanisme Pembentukan Struktur Geologi Daerah Batu Ampar Dan Sekitarnya, Kabupaten Bengkulu Selatan, Provinsi Bengkulu Zaid, Zaki Nurul; Sutriyono, Edy; Gusti, Ugi Kurnia
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1685

Abstract

This study examines the mechanisms of geological structure formation in the Batu Ampar area and its surroundings through field geological mapping and interpretation of Digital Elevation Model (DEM) imagery data. Outcrop identification was conducted to determine the types of structures in tectonically deformed rocks. The observations reveal several geological structures, including the Air Kedurang I Anticline, Air Kedurang I Syncline, Air Kedurang II Anticline, Air Kedurang II Syncline, Air Kedurang III Anticline, and the Batu Ampar Thrust Fault. Structural element analysis was carried out using Win Tensor and Dips software. The analyzed data include plane orientations (strike and dip) and pitch for fault structures, while fold analysis utilized orientation data from both fold limbs. Stereonet analysis and DEM interpretation indicate that the structural orientations and surface relief patterns predominantly trend northwest–southeast (NW–SE). The results suggest that compressional forces during the Early to Late Pliocene led to fold formation, which continued into the Pleistocene and triggered the development of the Batu Ampar Thrust Fault. Overall, the geological structures in the study area are interpreted to have formed due to sustained NW–SE–oriented tectonic activity from the Pliocene to the Pleistocene.
Karakteristik Batuan Karbonat Paleozoikum Formasi Silungkang, Cekungan Ombilin, Sumatera Barat, Indonesia Gusti, Ugi Kurnia
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1690

Abstract

The Silungkang Formation, part of the Peusangan Group in the Ombilin Basin of West Sumatra, Indonesia, has long been classified as a siliciclastic unit. However, recent fieldwork and petrographic analysis from limestone outcrops near Taratak Banca Village suggest there may have been carbonate development in the area during the Paleozoic. Observations in the field show a greyish white, weathered limestone with a crystalline texture. Although there were no visible fossils were found, the carbonate rock shows signs of tropical weathering and surface dissolution. Thin section analysis reveals that the limestone is made up almost entirely of calcite (around 98%), with a small amount of opaque minerals. The calcite grains, which range from 0.3 to 1.5 mm, display strong birefringence, moderate relief, and sutured grain boundaries—signs of extensive recrystallization. Other geological features like calcite-filled microfractures and quartz veins show an influence of tectonic activity, likely related to regional orogeny processes. The absence of fossils and the highly crystallize calcite mineral suggest it has undergone considerable diagenetic alteration, that could possibly related depositional environment of a deeper marine setting followed by post-depositional changes. Despite the lack of fossil evidence, the carbonate characteristics interpreted deposited at a mid- to outer-ramp carbonate setting that was later deformed and recrystallized. These findings highlight the potential for previously unrecognized Paleozoic carbonate systems in Southeast Asia and open new possibilities for understanding the Silungkang Formation. Ongoing research could help refine its place in regional paleogeographic models and provide insight into the evolution of early Paleozoic carbonate platforms in western Indonesia.
Modern Ripples and Oxide Limestone at Pasir Padi Beach, Pangkalpinang, Bangka Belitung Province, Indonesia: A Case for Geotourism Development Gusti, Ugi Kurnia; Noviyani, Alvera
Indonesian Journal of Earth Sciences Vol. 6 No. 1 (2026): January-June
Publisher : MO.RI Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52562/injoes.2026.1867

Abstract

Bangka Island, located in the eastern coast of Sumatra, is part of Indonesia’s unique and diverse geological heritage. Despite its potential, many of its coastal geosites remain poorly exposed and managed in terms of geoheritage value and geotourism development. This study focuses on Pasir Padi Beach, Pangkalpinang, aiming to evaluate its potential as a geotourism site using a integrated approach consisted of field surveys, geosite inventory assessment, and petrographic analysis of oxide-rich limestone from the Tanjung Genting Formation. Observations captured well-preserved modern ripple structures and dynamic shoreline processes that reflect active coastal sedimentation processes, offering valuable knowledge for both education and research. The site accessibility, combined with its past and modern geological features, showing it as a potential natural field laboratory for coastal sedimentology and geomorphology. Furthermore, the development of geotourism in this area bring a positive impact for supporting local economies through community engagement and sustainable tourism practices. The results support the inclusion of Pasir Padi Beach in Bangka Island geoheritage planning and recommend further efforts toward site conservation, interpretation, and integration into local tourism strategies towards becoming Unesco Global Geopark.
Analisis Geomorfologi pada Daerah Kinal dan Sekitarnya, Kabupaten Kaur, Provinsi Bengkulu Gusti, Ugi Kurnia; Pramana, Alfaris Hadi; Sutriyono, Edy
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1750

Abstract

The Kinal area and its surroundings in Kaur Regency, Bengkulu Province, are geomorphologically influenced by regional tectonic activity associated with the Bukit Barisan structural system and sedimentary formations of the Lemau Formation. These regional geological conditions control the development of structural, fluvial, karst, and denudational landforms in the study area. The purpose of this study is to analyze the geomorphological characteristics of the Kinal area based on the genetic landform classification of Van Zuidam (1985). The research method applies a geomorphological approach consisting of morphographic, morphometric, and morphogenetic analyses using DEMNas and SRTM data supported by field verification. Landform classification was conducted genetically through interpretation of slope classes, elevation, drainage patterns, lithology, and geomorphic processes. The results indicate six main geomorphic units, namely structural fault ridges, alluvial plains, channel bars, karst hills, weakly dissected denudational hills, and strongly dissected denudational hills, with elevations ranging from 150 to 450 meters above sea level. Drainage patterns are predominantly dendritic and sub-dendritic, reflecting lithological variation and structural control under intensive denudational processes. These findings demonstrate that regional tectonics and lithological resistance play a significant role in controlling geomorphic evolution and landscape development in the Kinal area.
Co-Authors Edy Sutriyono Noviyani, Alvera Pramana, Alfaris Hadi Ramadhani, Jesica Nabilah Rastra, Rastra Yandra Satya Nugraha Zaid, Zaki Nurul