APPLICATION OF DERIVATIVES AND EULER DECONVOLUTION METHODS USING GEOMAGNETIC DATA TO IDENTIFY THE STRUCTURES AND DISTRIBUTION OF TIN MINERALS IN PARIT TEBU AREA, EAST BELITUNG REGENCY, BANGKA-BELITUNG

• Main Author: Ockta P.R Simamora, Try
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/80452
• Institution: Institut Teknologi Bandung

Parit Tebu Village, Belitung Island, is located on the Southeast Asian Tin Belt which is rich in tin minerals. Geophysical exploration is needed to uncover this potential. In 2014, PSDG carried out geomagnetic exploration and produced a Total Magnetic Intensity (TMI) map of the research area. To analyze the tin mineral potential in more depth, the Reduce To Pole (RTP) method was carried out on the TMI map, which changed the map to a monopole. Through this RTP map analysis, regional and residual anomalies were separated using the Moving Average method (window width 9 and data spacing 100 m) and Butterworth as a comparison. The residual anomaly map used is the result of the Moving Average method because this map is more in line with the results of previous geochemical and geological research. Derivatives and Euler Deconvolution methods are used to determine the structure and estimate its depth. The results of the lineament patterns on the residual anomaly map, Derivatives method, and Euler Deconvolution are in good agreement with the surface geological structure patterns in the SW-NE, NW-SE and almost N-S directions with a depth of 30-110 m. Correlation of geochemical data with geophysics shows that the element of tin with a high dominant content appears in areas with low magnetic anomalies, thought to be due to paramagnetic tin, while the appearance of high magnetic anomalies is due to the presence of tin along with iron and neodine (ferromagnetic). The subsurface model of the Tebu Trench consists of alluvial deposits with a susceptibility of 0.001 SI, metasedimentary rocks with a susceptibility of 0.004 SI, quartz sandstone of 0.005 SI, and granite intrusions with a susceptibility of 0.008 SI. The presence of tin elements was found in alluvial deposits and metasedimentary rocks, the content of which reached 400 ppm. Thus, the Derivatives and Euler Deconvolution methods have succeeded in identifying geological structures in this research area well