LANDSCAPE MODEL OF THE TANJUNGPANDAN GRANITOID, BELITUNG DISTRICT, BANGKA BELITUNG ISLANDS PROVINCE, INDONESIA

Abstract

The Tanjungpandan granitoid landscape reflects a landscape model influenced by interaction of granite characteristics, fractures, sea-level fluctuations, and climate. This study aims to reveal those interactions quantitative and qualitatively, in particular, the separation between regolith and resistant granite masses. The location of the research area is in Tanjungpandan, Belitung District, Bangka-Belitung Islands Province, Indonesia. The method applied in this research is field observation and laboratory works consisting of
petrographic analysis and geochemical analysis with the XRF method to determine the rock properties which is affected to the rock resistance level. In addition, fractures observation was carried out to determine the fracture pattern and dimension. The objective of the research analysis is to reconstruct the role of the interaction between granite and fracture characteristics with the climate change and sea-level fluctuations which are external factors that play a role in rock weathering which in turn produces granite landscape models. Based on classifications [3] the landscape of Tanjungpandan granite consists of inselberg, bornhardts, nubbins, castle
koppies, pillars, and etches. Other features are ranges of minor granite boulders, flare slope, grooves, valleys, and aplite embankments. The vertical and sheet fractures are very dominant affected by differential weathering below the surface, compared to the granite properties which are less significant. The landscape of Tanjungpandan granitoid is very typical due to its genesis which involved sea-level fluctuations during the Quaternary, and tectonic-magmatic of island arcs.