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All Journal Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII
Afri Tri Kristanto
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Karakterisasi dan Potensi Pasir Besi Formasi Kabuh Daerah Mlale, Kecamatan Jenar, Kabupaten Sragen, Provinsi Jawa Tengah Afri Tri Kristanto; Al Hussein Flowers Rizqi
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
Publisher : Institut Teknologi Nasional Yogyakarta

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Characterization and potential of sand deposits in the Kabuh Formation at Mlale Region because gray-black sand deposits were found with magnetic properties, interpreted as iron sand. The purpose of this study was to determine the characteristics and potential of iron sand deposits. The research methods used are detailed observations, rock sampling, laboratory activities for petrology and XRF geochemical analysis, studio activities for data interpretation. The geological condition shows 1 – 3 meters gray-black sand deposits with +20 meters layer. The petrological analysis shows the grain size fine – coarse sand, slightly rounded – angular shape, opaque minerals is 66% megascopically and microscopically 23%. Sand deposits are interpreted as alluvial placer deposits from Nglanggran Formation and Kebobutak Formation at the Southern Mountains Zone, as well as the Anggota Banyak Kalibeng Formation and Pucangan Formation from Kendeng Zone. The enrichment factor is from magnetic minerals on source rock and the basin topography, but the destruction factor is not well developed. XRF geochemical analysis showed 4.41% Fe content and 7.71% hematite (Fe2O3) content. This grade can’t be processed and refined as metal mineral. Increasing the value can be better by filtering and separation.
Distribusi Unsur dan Mineral pada Batuan Alterasi Illit-Serisit±Biotit Sekunder di Daerah Sumbersari Afri Tri Kristanto
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
Publisher : Institut Teknologi Nasional Yogyakarta

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The Kulonprogo Mountains as part of the magmatism path of the southern mountains which have mineral potential with small to large economic value. Epithermal mineralization has previously been found in the Kokap, Gunung Gupit – Menoreh, and Bagelen – Gunung Agung areas. This study identifies mineralization in the central-proximal facies of the Purba Ijo Volcano in Sumbersari, Kaligesing, Purworejo by looking at the geological conditions and distribution patterns of minerals in alteration rocks to provide data and information on geological phenomena in the study area. The research was conducted using literature study, data collection and observation, laboratory work, as well as interpretation and research evaluation. The geological condition of the study area is in the central – proximal facies of Khuluk Gajah which consists of andesite lava intruded by microdiorite, quartz microdiorite, diorite, andesite, basaltic andesite, and covered with Jonggrangan limestone. Many intrusions are supported by structures that develop around the microdiorite intrusion. Mineralization develops associated with porphyry type I guess with stockwork and sheeted vein textures, with vein types A, AB, and D. The final phase of alteration is sericite, illite, kaolinite, and pyrite dissemination which shows overprint by the epithermal system. In the LP2B sample XRD analysis shows an epithermal process that enters the porphyry body. XRF micro-analysis showed a diffuse pattern of altered minerals with a predominance of Si and heavy minerals and relatively clustered sulfides with a predominance of Fe and Cu. The relatively dominant S and Si elements in each vein are interpreted as being carried by the fluid that forms the vein.
Co-Authors Al Hussein Flowers Rizqi