Karakteristik Mineralogi dan Identifikasi Unsur Tanah Jarang (REE) pada Batuan Granitoid dan Gabro Batolith Ombilin, Kota Sawahlunto, Sumatra Barat
DOI:
https://doi.org/10.29303/goescienceed.v7i4.3259Keywords:
Rare Earth Elements (REE); Granite; Granodiorite; Gabbro; GeochemistryAbstract
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
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