This thesis describes the result of a geochemical study concering the causes and consenquences of a natural form of environmental pollution that is associated with volcanic activity. Concentrations of chemical elemetns strongly exceed common geological background levels in the study area near Patuha volcano, West Java, Indonesia.
Merapi volcano is one of the most active volcanoes in the world and during the last 3000 yrs, it has been more or less continuously in eruption. Merapi volcano is a stratovolcano with a south-west facing horseshoe-shaped summit crater filled by a lava dome. Its composition rangers from basalt to basaltic andesite (52 to 56% SiO2) and it has high Al2O3 (18.5 to 20.2% wt) and medium to high K2O …