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- W2072429320 abstract "Abstract Batur volcanic field (BVF), in Bali, Indonesia underwent a complex evolution that comprised three periods of building and two major caldera-forming eruptions. The magmas erupted show a broad range of compositions from basaltic to rhyolitic (50–71 wt.% SiO2) and variable phenocryst assemblages. Based on their mineralogy and geochemistry, these magmas may be assigned to four distinct suites: (1) plagioclase+olivine suite that comprises basalts only, (2) plagioclase+orthopyroxene+clinopyroxene+amphibole suite that includes andesites, (3) plagioclase+clinopyroxene+orthopyroxene suite that consists of basalts to andesites and (4) plagioclase+olivine+clinopyroxene suite with basaltic andesite to dacite magmas. Modelling indicates that the compositional variations within the various suites were produced by fractional crystallization of observed phenocryst assemblages. It also suggests that the four suites were produced by fractionation from basaltic parental magmas with similar major element compositions. Incompatible trace element ratios, however, indicate that there were significant differences in trace element contents between the parental melts, likely to reflect variable degrees of depletion of a MORB-like mantle wedge and variable degrees of metasomatism by a slab-derived component enriched in large ion lithophile elements (LILE) and light rare earth elements (LREE). Additional variations in H2O (1–3 wt.%) within the parental melts are necessary to account for the range of phenocryst assemblages that produced the four suites. Initial variations in H2O content combined with variable pressure of crystallization (possibly" @default.
- W2072429320 created "2016-06-24" @default.
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- W2072429320 date "2004-12-01" @default.
- W2072429320 modified "2023-10-03" @default.
- W2072429320 title "Magmatic evolution at Batur volcanic field, Bali, Indonesia: petrological evidence for polybaric fractional crystallization and implications for caldera-forming eruptions" @default.
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- W2072429320 doi "https://doi.org/10.1016/j.jvolgeores.2004.07.009" @default.
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