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All Journal Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Ngadenin Ngadenin
Pusat Teknologi Bahan Galian Nuklir – BATAN
Social Sciences

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POTENSI THORIUM DAN URANIUM DI KABUPATEN BANGKA BARAT Ngadenin, Ngadenin; Syaeful, Hery; Widana, Kurnia Setiawan; Nurdin, Muhammad
Eksplorium Buletin Pusat Teknologi Bahan Galian Nuklir Vol 35, No 2 (2014): November 2014
Publisher : Pusat Teknologi Bahan Galian Nuklir - BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (30.019 KB)

Abstract

Thorium dan uranium di Pulau Bangka terdapat di dalam mineral monasit. Secara geologi monasit terbentuk pada  granit tipe S, batupasir serta endapan aluvium.  Di daerah Bangka Barat terdapat beberapa granit tipe S dan aluvium hasil rombakannya sehingga wilayah ini dianggap sebagai wilayah potensial untuk terbentuk cebakan monasit tipe plaser. Granit tipe S dianggap sebagai sumber monasit sedangkan aluvium hasil rombakannya dianggap sebagai tempat berakumulasinya monasit. Tujuan penelitian ini adalah untuk mengetahui informasi geologi dan potensi sumber daya thorium dan uranium pada endapan aluvium di Bangka Barat. Metoda yang digunakan adalah pemetaan geologi, pengukuran kadar thorium dan uranium batuan, pengambilan sampel batuan granit untuk analisis petrografi, pengambilan sampel mineral berat pada aluvium untuk analisis butir. Hasil penelitian menunjukkan bahwa litologi di wilayah Bangka Barat tersusun oleh satuan sekis, satuan metabatupasir, terobosan granit, terobosan diabas, satuan batupasir dan aluvium. Monasit dijumpai pada terobosan granit, satuan batupasir dan aluvium. Sesar yang berkembang adalah sesar-sesar yang berarah relatif barat laut–tenggara, timur laut–barat daya dan barat–timur. Hasil analisis butiran mineral berat menunjukkan persentase monasit rata-rata dalam mineral berat adalah sebesar 6,34%. Mineral lain yang terdapat dalam cebakan plaser dan cukup potensial adalah zirkon 36,65 %, ilmenit 19,67%, dan kasiterit 14,75%.Kata kunci: endapan plaser, aluvium, thorium, uranium, granit, Bangka Barat
Radioactive Mineral Distribution on Tin Placer Deposits of Southeast Asia Tin Belt Granite in Bangka Island Ngadenin, Ngadenin; Sukadana, I Gde; Syaeful, Heri; Muhammad, Adi Gunawan; Indrastomo, Frederikus Dian; Rosianna, Ilsa; Ciputra, Roni Cahya; Adimedha, Tyto Baskara; Pratiwi, Fadiah; Rachael, Yoshi
EKSPLORIUM Vol 44, No 2 (2023): November 2023
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2023.6969

Abstract

Bangka Island is an area rich in primary and secondary tin deposits. Tin deposits are formed around the contact between granite and older rocks, while secondary tin deposits are formed in the modern channels and paleochannels. Many previous researchers have researched radioactive minerals in primary tin deposits and modern channel deposits, but research on radioactive minerals in paleo channel deposits has never been carried out. The characterization of radioactive minerals in paleo channel deposits was done in this study to determine the potency of radioactive minerals in secondary tin deposits by comparing the content of radioactive minerals in paleochannels with modern channels and tin mine tailing deposits. The data used were mineralogical data and radioactivity data, along with the uranium and thorium content of the rocks from several previous studies. Data showed significant mineral content differences in paleo channel, modern channel, and tin mine tailings deposits. Mineral (monazite and zircon) content in tin mine tailing deposits was the highest. Source rocks for the radioactive minerals monazite and zircon are predicted to be the granitic rocks or tourmaline quartz veins of primary tin deposits. The radioactivity value of rocks in the paleo channel is relatively the same as the modern channel, ranging from 20 to 150 c/s. Uranium content in paleo channel is the same as modern channel deposits, ranging from 10 to 15 ppm eU. The thorium content of the rocks in the paleo channel ranges from 1 to 60 ppm eTh, while in the modern channel, it ranges from 1 to 45 ppm eTh. The radioactivity value and uranium content of the rocks are less effective for determining potential areas of radioactive minerals in placer tin deposits. In contrast, data on thorium content are quite effective for determining potential areas of radioactive minerals in placer tin deposits.
Co-Authors Adi Gunawan Muhammad Adimedha, Tyto Baskara Ciputra, Roni Cahya Frederikus Dian Indrastomo, Frederikus Dian Heri Syaeful Hery Syaeful I Gde Sukadana Kurnia Setiawan Widana Muhammad Nurdin Pratiwi, Fadiah Rachael, Yoshi Rosianna, Ilsa