Dr. I Gusti Bagus Eddy Sucipta
Belitung iss one of the candidates of UNESCO Global Geopark. The main geosite in this area are granite and tin mining area. However, the other special geosite is volcanic rock in Siantu beach; pillow and autobreccia lava, and dyke in the middle of continental terrain. The petrological characteristic of this pillow lava and dyke is basalt. Dyke intruded the pillow lava. Crystal size distribution (CSD) of Plagioclase of pillow lava and dyke show the different of crystals size and growth history. The resident time of pillow lava is ~1 year for a growth rate of 〖10〗^(-6) mm/s and the dyke is ~33 years for a growth rate 〖10〗^(-8)mm/s. The rock forming history could be useful information for special geosite I Belitung Geopark. Keywords: Belitung, Geopark, Siantu; Pillow lava; CSD; Plagioclase.
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