Update Artikelilmiah: 38956

DHOFAERI WILDAN

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Abstrak (Bhs. Indonesia)

Indonesia berada di jalur Sabuk Timah Asia Tenggara yang tersebar salah satunya di Pulau Bangka. Oleh karena itu, perlu untuk melakukan penelitian dengan memadukan beberapa analisis agar mendapatkan informasi akurat. Lokasi penelitian berada di Daerah Cungfo, Kecamatan Bakam, Kabupaten Bangka, Provinsi Kepulauan Bangka Belitung. Penelitian ini bertujuan untuk mengetahui karakteristik endapan timah primer dengan meninjau aspek geologi, alterasi, dan mineralisasi. Metode yang digunakan berupa grid mapping geology dengan jarak pengambilan sampel 200 meter. Sampel yang diambil berupa outcrop, soil, dan/atau float. Analisis laboratorium meliputi X-Ray Fluoresence (XRF) Portable, X-Ray Diffraction (XRD), petrografi, dan mineragrafi. Stratigrafi daerah penelitian dari umur yang paling tua ke muda yaitu Satuan Sekis Mika (Karbon-Permian), Satuan Batupasir (Trias Awal-Trias Tengah), dan Satuan Granit (Trias Akhir-Jura Awal). Himpunan mineral alterasi berdasarkan pengamatan lapangan dan analisis XRD yaitu Zona Kuarsa + Kaolinit + Ilit ± Smektit ± Dickit, Zona Kuarsa + Albit + Mikroklin ± Muskovit, Zona Kuarsa + Muskovit ± Serisit. Endapan timah primer hadir dalam pola mineralisasi sistem endapan urat yang nilai kadar tertingginya 2.505 ppm. Alterasi dan mineralisasi pada daerah penelitian dikontrol oleh litologi dan struktur geologi dengan deformasi fase pertama yang arahnya barat laut-tenggara. Tipe endapan adalah Endapan Greisen Dalam dengan fase pengendapan urat.

Abtrak (Bhs. Inggris)

Indonesia located in the Southeast Asia Tin Belt route, which is spread all the way to Bangka Island. Therefore, it is necessary to conduct research by combining several analyzes in order to obtain accurate information. The research location is in the Cungfo Region, Bakam District, Bangka Regency, Bangka Belitung Islands Province. This study aims to determine the characteristics of primary tin deposits by reviewing the aspects of geology, alteration, and mineralization. The method used is geological grid mapping with a sampling distance of 200 meters. The samples taken are in the form of outcrops, soil, and/or buoys. Laboratory analysis includes Portable X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), petrography, and mineragraphy. The stratigraphy of the study area from oldest to youngest includes the Mica Schist Unit (Carbon-Permian), Sandstone Unit (Early Triassic-Middle Triassic), and Granite Unit (Late Triassic-Early Jurassic). Changes in mineral assemblages based on field observations and XRD analysis are Quartz + Kaolinite + Ilit ± Smectite ± Dickit Zone, Quartz + Albit + Microcline + Muscovite Zone, Quartz + Muscovite ± Sericite Zone. Primary tin deposits are present in the mineralization pattern of the urate deposit system with the highest grade value of 2,505 ppm. Alteration and mineralization in the area controlled by lithology and geological structure with the first phase deformation trending to the northwest-southeast. The deposit type is Endo-Greisen Deposit with vein depositional phase.

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