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Harnani
Universitas Sriwijaya
Agriculture, Biological Sciences & Forestry Chemistry Education Physics

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Karakteristik Batuan Pra-Tersier dan Tersier Berdasarkan Metode Petrografi Studi Kasus pada Daerah Muaro Sijunjung, dan Sekitarnya, Kabupaten Sijunjung, Sumatera Barat Radiyan Nur Iksan; Harnani
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 3 (2026): August (Inpres)
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i3.2039

Abstract

The Muaro Sijunjung area and its surroundings, Sijunjung Regency, West Sumatra, have complex geological conditions due to the influence of tectonic, magmatic, and sedimentary processes that have occurred from the Pre-Tertiary to the Tertiary periods. This study aims to identify the characteristics of Pre-Tertiary and Tertiary rocks based on petrographic analysis to understand their mineralogical composition, texture, and formation processes. The research method involved petrographic observation of thin sections using a polarizing microscope with parallel and crossed nicols. The analyzed samples were sourced from the Kuantan Formation (Pckl), Granite Intrusion (Tgr), Sawahtambang Formation (Tost), and Ombilin Formation (Tmo). Analysis results indicate that the Kuantan Formation consists of crystalline limestone classified as Dismicrite Mudstone, while the Granite Intrusion comprises Monzo-Granite and Syeno-Granite. The Sawahtambang Formation is dominated by non-carbonate sandstone classified as Sublitharenite Arkose, while the Ombilin Formation consists of carbonate sandstone and carbonate mudstone, classified as Lithic Wacke and Mudrock, respectively. The observed mineralogical and textural characteristics indicate the influence of diagenetic, sedimentary, magmatic, and alteration processes on each rock unit. The research results indicate that the geological evolution of the Muaro Sijunjung area is controlled by the interaction of sedimentary processes, magmatic intrusions, and tectonic activity that occurred from the Pre-Tertiary to the Tertiary periods.
Studi Geomorfologi Daerah Kedungpoh dan Sekitarnya, Kabupaten Gunung Kidul, Daerah Istimewa Yogyakarta Suci Febria Lestari; Harnani
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.v7i1.1669

Abstract

The Kedungpoh area and its surroundings in Gunung Kidul Regency, Yogyakarta, are part of the Wonosari Basin, which exhibits complex geomorphological characteristics resulting from the interaction of lithology, geological structures, and exogenic processes. This study aims to identify landform units and analyze the geomorphic processes that contribute to the development of geomorphology in the study area. The methods employed include morphological, morphometric, and morphogenetic analyses through the interpretation of topographic maps, DEM data, and direct field observations. The results indicate that the analyzed area can be classified into seven main geomorphic units: Low Denudational Hills with Moderate Erosion, Denudational Hills with High Erosion, High Denudational Hills with High Erosion, Fault Zone Hills with High Erosion, Floodplain, Irregular Meandering Channel, and Lapilli Plain. The morphology of the study area is controlled by variations in Tertiary lithology, the development of major fault structures such as the Pilangrejo Fault and the Pengkol Fault, as well as intensive fluvial and denudational processes. The dominant geomorphic processes include denudation, fluvial activity, and volcanic deposition, with erosion intensity ranging from moderate to high. These findings provide insight into the dynamics of landform development in the Kedungpoh area, which are controlled by the interaction of geological structures, lithology, and ongoing geomorphic processes.
Analisis Elektrofasies Berdasarkan Data Well Logging pada Seam Batubara A1–D di Pit N, Tanjung Enim, Sumatera Selatan Muhammmad Rafi Al Hawari Rafi; Harnani
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.v7i1.1741

Abstract

The equitable distribution of educational facilities is a crucial aspect of supporting sustainable regional development, particularly at the senior high school level as part of the secondary education system. Inequality in school distribution may affect accessibility and equal educational opportunities across regions. This study aims to analyze the spatial distribution patterns and service coverage of senior high school facilities in Kabupaten Magetan. The research employs a quantitative approach using Geographic Information System (GIS)-based spatial analysis. Analytical techniques include mapping school distribution, applying the Average Nearest Neighbor (ANN) analysis to identify distribution patterns, and conducting buffer analysis to evaluate service accessibility to residential areas. The results indicate that educational facilities tend to form clustered patterns in areas with higher accessibility levels. Service coverage analysis also reveals disparities in accessibility among regions, where central areas demonstrate better service coverage compared to peripheral zones. These findings suggest that the equitable distribution of educational facilities still requires optimization in spatial planning to enhance educational access equity and support sustainable regional development.
Co-Authors Muhammmad Rafi Al Hawari Rafi Radiyan Nur Iksan Suci Febria Lestari