ALTERATION, MINERALIZATION, AND GEOCHEMISTRY OF TUNGSTEN AND RARE EARTH ELEMENTS ON THE TIKUS DEPOSIT, TANJUNGPANDAN PLUTON, BELITUNG REGENCY, PROVINCE OF BANGKA-BELITUNG ISLANDS

• Main Author: EMMANUELLE (NIM : 12113048), MARSHEL
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22987
• Institution: Institut Teknologi Bandung

The Tikus deposit is the most important primary ore deposit hosted by granite within the Tanjungpandan pluton on Belitung Island, Indonesia. Although the site is known for its tin, several of the granite varieties there have been shown to host economic deposits of tungsten and rare earth elements (REE). Given the current surge in technology, the demand for these particular elements will encourage future exploration programs. Geochemical surveys were conducted on Mount Tikus and surrounding locations within the Tanjungpandan pluton, yielding 18 rock chip samples of several granite varieties. Optical mineralogy (petrography and mineragraphy), analytical spectral device (ASD) reflectance interpretation, and inductively coupled plasma mass spectrometry (ICP-MS) were carried out to detect the alteration and mineralization type within the pluton and measure geochemical pattern of tungsten and REE. Samples show major enrichment in light rare earth elements (LREE) and minor enrichment in heavy rare earth elements (HREE) while depletion is shown in middle rare earth element (MREE). The enrichment of REE is presumably caused by the existence of accessory minerals (allanite, zircon, monazite, and apatite) detected in the rocks. Tungsten, along with tin, is present in fine-grained cassiterite–wolframite mineralization disseminated in greisen. Tungsten is also found in the mineral scheelite in greisen phase. This information will assist in the development of exploration models for future mining ventures on the Tanjungpandan pluton.