GEOCHEMICAL CHARACTERISTICS OF DORO API TOI AND DORO API BOU, TAMBORA CALDERA, DOMPU AND BIMA DISTRICTS, WEST NUSA TENGGARA PROVINCE
The study was carried out on the Doro Api Toi and Doro Api Bou lava domes in the Tambora Caldera area, Dompu and Bima Regencies, West Nusa Tenggara. The lava dome is one of the products formed after the eruption of Mount Tambora in 1815. The research aims to determine the process of rock formatio...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/69865 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The study was carried out on the Doro Api Toi and Doro Api Bou lava domes in the
Tambora Caldera area, Dompu and Bima Regencies, West Nusa Tenggara. The lava dome
is one of the products formed after the eruption of Mount Tambora in 1815. The research
aims to determine the process of rock formation, magma series, and tectonic order with
petrogenesis
The method used in this research is petrographic analysis from thin section
description, and rock geochemical analysis based on XRF (X-Ray Flourence Spectometry)
and ICP-MS (Inductively Coupled-Plasma Mass Spectrometry) data in the form of percent
weight percentages of major elements and trace element concentrations.
Petrographic analysis of samples of Doro Api Toi and Doro Api Bou showed
pyroxene andesit with porphyritic, vitriolic, flow, glomeroporphyritic with phenocryst
plagioclase, pyroxene, opaque minerals, olivine, xenoliths tuff glass in the base mass of
volcanic glass and plagioclase microlites. magma series samples showing the calc-alkali
magma series and magmatism controlled by crystal fractionation and assimilation. Tectonic
setting analysis show plate boundary tectonic environments in subduction areas that form
volcanic features as island arcs which affected by arc contamination |
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