2006
DOI: 10.1016/j.gca.2006.06.1224
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Magma–crust interaction at Merapi volcano, Indonesia: Geochemical insights into volcano behaviour

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“…Rather than a source process, this indicates significant late-stage contamination in the crust given the stability field of plagioclase (Ramos et al, 2005), which is obscured in whole-rock isotope ratios. Heterogeneous groundmass and melt inclusions as reported by Schwarzkopf et al (2001), as well as small basaltic inclusions (Troll et al, 2003) incorporated into whole-rocks, are likely to result in generally suppressed 87 Sr/ 86 Sr whole-rock values. Extensive evidence of magma mixing and mafic replenishment is apparent in recent Merapi whole-rocks (Gertisser & Keller, 2003b;Troll et al, 2003;Chadwick et al, in preparation); and previous workers have argued for the process of magma mixing during recent eruptions (Boudon et al, 1993; Terminology from Spera & Bohrson (2001): tlm, liquidus of magma; tm0, initial temperature of magma; tla, liquidus of assimilant; ta0, initial temperature of assimilant; ts, solidus temperature; cpm, magma isobaric specific heat capacity; cpa, assimilant isobaric specific heat capacity; hcry, enthalpy of crystallization; hfus, enthalpy of fusion.…”
Section: Quantitative Modelling Of Crustal Interactionmentioning
confidence: 66%
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“…Rather than a source process, this indicates significant late-stage contamination in the crust given the stability field of plagioclase (Ramos et al, 2005), which is obscured in whole-rock isotope ratios. Heterogeneous groundmass and melt inclusions as reported by Schwarzkopf et al (2001), as well as small basaltic inclusions (Troll et al, 2003) incorporated into whole-rocks, are likely to result in generally suppressed 87 Sr/ 86 Sr whole-rock values. Extensive evidence of magma mixing and mafic replenishment is apparent in recent Merapi whole-rocks (Gertisser & Keller, 2003b;Troll et al, 2003;Chadwick et al, in preparation); and previous workers have argued for the process of magma mixing during recent eruptions (Boudon et al, 1993; Terminology from Spera & Bohrson (2001): tlm, liquidus of magma; tm0, initial temperature of magma; tla, liquidus of assimilant; ta0, initial temperature of assimilant; ts, solidus temperature; cpm, magma isobaric specific heat capacity; cpa, assimilant isobaric specific heat capacity; hcry, enthalpy of crystallization; hfus, enthalpy of fusion.…”
Section: Quantitative Modelling Of Crustal Interactionmentioning
confidence: 66%
“…Conversion of limestone to a diopside^wollastonite assemblage, as seen in the Merapi calc-silicate xenoliths (Fig. 2), would liberate CO 2 (Goff et al, 2001;Troll et al, 2003;Gaeta et al, 2006). This additional CO 2 would be relatively insoluble in the melt in a crustal basaltic andesite system (Holloway & Blank, 1994) and could result in rapid volatile saturation of the magma, potentially triggering an eruption.…”
Section: Quantitative Modelling Of Crustal Interactionmentioning
confidence: 98%
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