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All Journal Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal)
Hasan Riyadi
Universitas Jambi
Agriculture, Biological Sciences & Forestry Chemistry Education Physics

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Karakteristik Mineralogi dan Geokimia serta Distribusi Spasial Cu-Au pada Lava Basal Berasosiasi Urat Kuarsa di Lembah Segar, Sawahlunto, Sumatra Barat Pramudia Simanjuntak; Muhammad Ferdinan Hasmiansyah Marzha; Hari Wiki Utama; Hasan Riyadi
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 4 (2026): November (In Press)
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i4.3252

Abstract

Evidence of Cu-Au mineralization in basaltic lava from the Segar Valley, Sawahlunto, West Sumatra, indicates heterogeneous elemental enrichment that may not be resolved by geochemical analysis alone. This study characterizes the mineralogy and geochemical composition of basaltic lava and evaluates microscale analysis for identifying localized Cu-Au enrichment. The study integrates petrographic analysis, X-ray fluorescence (XRF), micro-XRF, elemental mapping, and combined elemental mapping of three basaltic lava samples. Petrographic analysis identified quartz, plagioclase, chlorite, epidote, and opaque minerals, with quartz veins indicating hydrothermal fluid interaction. XRF detected Cu at 500–800 ppm in all samples, whereas Au was not detected. Micro-XRF detected Au in all samples and identified the strongest Cu-Au enrichment in V3, reaching 62.778 wt.% Cu and 9.219 wt.% Au. Combined elemental mapping showed spatial proximity between Cu and Au within quartz vein zones in V3. V1 displayed localized linear enrichment, whereas V4 contained up to 69,900 ppm S but relatively low microscale Cu enrichment. These results demonstrate that microscale analysis enhances the identification of localized Cu-Au enrichment. The Cu-Au is interpreted as hydrothermal in origin and spatially associated with quartz veins and fractures, while mineral hosts and deposit classification require further verification.
Karakteristik Mineralogi dan Identifikasi Unsur Tanah Jarang (REE) pada Batuan Granitoid dan Gabro Batolith Ombilin, Kota Sawahlunto, Sumatra Barat Giovanni Keane Manosor; Nabilla Dwie Maharani; Zaidhan Abi Fathan; Hari Wiki Utama; Hasan Riyadi
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 4 (2026): November (In Press)
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i4.3259

Abstract

Granite, granodiorite, and gabbro exposed in the Kubang Tangah and Muaro Kalaban areas, Sawahlunto City, West Sumatra, exhibit variations in mineralogical and geochemical characteristics that provide important information on the occurrence of rare earth elements (REE). This study aims to characterize the mineralogical and geochemical properties of the rocks and evaluate REE distribution at the mineral scale. Four rock samples, namely G-1, Gr-2, Gb-3, and Gb-4, were analyzed using petrographic, X-Ray Fluorescence (XRF), and Micro-X-Ray Fluorescence (µ-XRF) methods. Petrographic analysis classifies G-1 as granite, Gr-2 as granodiorite, and Gb-3 and Gb-4 as gabbro. XRF analysis reveals variations in geochemical composition among the samples, with SiO₂, Al₂O₃, Fe₂O₃, and CaO representing the major oxide components, while MgO and TiO₂ are relatively higher in Gb-3 and Gb-4. µ-XRF analysis was used to evaluate elemental distribution at the mineral scale, with Y, La, Ce, Nd, and Lu as the main REE elements considered. The integration of petrographic, XRF, and µ-XRF results indicates a relationship between mineralogical variations, geochemical characteristics, and elemental distribution among the studied samples. These results provide a basis for evaluating REE occurrence and identifying minerals potentially associated with REE in the intrusive rocks of the study area
Co-Authors Giovanni Keane Manosor Hari Wiki Utama Muhammad Ferdinan Hasmiansyah Marzha Nabilla Dwie Maharani Pramudia Simanjuntak Zaidhan Abi Fathan