Geologi dan Identifikasi Cebakan Bijih di Daerah Batubesi, Belitung Timur

Ngadenin Ngadenin, Frederikus Dian Indrastomo, Adhika Junara Karunianto, Ersina Rakhma

DOI: http://dx.doi.org/10.17146/eksplorium.2017.38.1.3376

Sari


ABSTRAK

Wilayah Batubesi di Belitung Timur berada di zona bagian timur dari granit jalur timah Asia Tenggara sehingga diduga merupakan daerah yang sangat potensial bagi terbentuknya cebakan bijih seperti besi dan timah bersama dengan monasit dan mineral asesoris lainnya. Penelitian ini bertujuan untuk mengetahui tataan geologi dan mengidentifikasi keterdapatan cebakan bijih dan mineral ikutan radioaktif  di daerah Batubesi. Metodologi dalam penelitian ini adalah pemetaan geologi, pengukuran kadar uranium dan thorium, analisis petrografi, mineragrafi, dan butir. Daerah penelitian tersusun atas satuan granit dan metabatupasir. Granit diidentifikasi sebagai granit biotit dan granit hornblenda. Struktur geologi yang berkembang adalah sesar sinistral berarah barat daya – timur laut dan sesar dekstral berarah tenggara – barat laut. Cebakan bijih yang terbentuk di  merupakan cebakan bijih besi primer tipe skarn iron tin polymetallic dengan magnetit sebagai mineral utama dan monasit serta zirkon sebagai mineral ikutan radioaktif . Mineral ikutan lainya adalah hematit, ilmenit, kasiterit, dan rutil.

 

ABSTRACT

The Batubesi area in Belitung Timur is located in the eastern part of the Southeast Asian granites tin belt zone, so that it expected as a potential area for the occurence of ore deposit such as iron and cassiterite associate with monazite and other accessories minerals. The study aimed to understand the geological setting and to determine the occurrence of primary ore deposit and its radioactive accessories minerals. The methodologies in this research are geological mapping, uranium and thorium grade measurement, petrography, mineragraphy and grain counting analysis. The area composed by granite and metasandstone units. Types of granites are biotite and hornblende granites. The geological structures founded in this area are SW-NE sinistral and NW-SE dextral faults. Ore deposit in the area is primary iron ore deposits of skarn iron tin polymetallic type where magnetite is the main mineral while monazite and zircon are radioactive accessories minerals. The other accessories minerals are hematite, ilmenite, cassiterite, and rutile.


Kata Kunci


geologi; radioaktif; Batubesi; kasiterit; bijih besi; monasit

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Referensi


[1] M. O. Schwartz, S. S. Rajah, A. K. Askury, P. Putthapiban, and S. Djaswadi, “The Southeast Asian Tin Belt,” Earth-Science Reviews, vol. 38, pp. 95–293, 1995.

[2] Baharuddin dan Sidarto, “Peta Geologi Lembar Belitung, Sumatera Skala 1 : 250.000,” Pusat Penelitian dan Pengembangan Geologi, Bandung, 1995.

[3] S. Wai-Pan Ng, S. Chung, L. J. Robb, M. P. Searle, A. A. Ghani, M. J. Whitehouse, G. J. H. Oliver, M. Sone, N. J. Gardiner, and M. H. Roselee, ”Petrogenesis of Malaysian Granitoids in the Southeast Asian Tin Belt: Part 1. Geochemical and Sr-Nd Isotopic Characteristics,” Geological Society of America Bulletin, published online on 3 April 2015.

[4] C. Wang, J. Deng, E. J. M. Carranza, and M. Santish, “Tin Metallogenesis Associated with Granitoid in the Southwestern Sajinag Tethyan Domain: Nature, Deposit Type and Tectonic Setting,” Gondwana Research, vol. 26, pp.576–593, 2014.

[5] R. C. Wang, L. Xie, J. Chen, A. Yu, L. Wang, I. Lu, and J. Zhu, “Tin-Carrier Minerals in Metaluminous Granites of the Western Nanling Range (southern China): Constraints on Processes of Tin Mineralization in Oxidized Granites,” Journal of Asian Earth Sciences, vol. 74, pp. 361–372, 2013.

[6] Ngadenin, ”Sebaran Monasit pada Granit dan Aluvial di Bangka Selatan,” Jurnal Pengembangan Energi Nuklir, vol. 13, no. 2, pp. 102–110, 2011.

[7] W. Mei, X. Lu, X. Cao, Z. Liu, Y. Zhao, Z. Ai, R. Tang, and M. M. Abfaua, “Ore Genesis and Hydrothermal Evolution of the Huanggang Skarn Iron–Tin Polymetallic Deposit, Southern Great Xing'an Range: Evidence from Fluid Inclusions and Isotope Analyses,” Ore Geology Reviews, vol. 64, pp. 239–252, 2015.

[8] C. Yongsheng, “Geochemical Characteristics of the Fluid Inclusion of the Dafulou Deposits in Guangxi, China,” Procedia Environmental Sciences, vol. 12, pp. 366–371, 2012.

[9] I. Gaafar, “Integration of Geophysical and Geological Data for Delimitation of Mineralized Zones in Um Naggat Area, Central Eastern Desert, Egypt,” NRIAG Journal of Astronomy and Geophysics, vol. 4, pp. 86–99, 2015.

[10] A. A. Elkhadragy, A. A. Ismail, M. M. Eltarras, and A. A. Azzazy, ”Utilization of Airborne Gamma Ray Spectrometric Data for Radioactive Mineral Exploration of G.Abu Had–G.Umm Qaraf Area, South Eastern Desert, Egypt,“ NRIAG Journal of Astronomy and Geophysics, 2016.

[11] N. Natasia, M. N. Barkah, D. H. Saputra, dan M. K. Alfadli, ”Studi Awal Potensi Bahan Galian pada Daerah Kabupaten Belitung Timur, Indonesia,” Bulletin of Scientific Contribution, vol. 14, no. 2, pp. 153–162, 2016.


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