The compositional dependence of the saturation surface of H2O+CO2 fluids in silicate melts

Papale, Paolo; Moretti, Roberto; Barbato, David

doi:10.1016/j.chemgeo.2006.01.013

Cited by 498 publications

(527 citation statements)

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“…Putirka (2005) 1098-1108 Ilmenite-magnetite Spencer and Lindsley (1981) 1107 NNO − 0.04 Andersen and Lindsley (1988) 1002 NNO − 0.33 Ghiorso and Evans, (2008) 1013 NNO + 0.04 Cpx-melt Putirka et al (2003) 998-1104 2.3-5.2 Melt inclusion (volatile-saturated) Papale et al (2006) Ghiorso and Gualda (2015) 0.2-4.6 0.2-2.6 should be sulphide-saturated. There are also sulphide globules in the groundmass of some of the samples.…”

Section: Mineralmentioning

confidence: 99%

“…Mineral saturation temperatures can be obtained from the chemistry of the coexisting melt inclusion and its host mineral, provided that subsequent chemical diffusion has not modified their chemistry. Using the temperatures modelled for each inclusion following Putirka (2005) and the H 2 O-CO 2 model of Papale et al (2006), we obtain saturation pressures for those melt inclusions considered to be vapour saturated, from 50 to 500 MPa. These pressures correlate with those obtained from the VolatileCalc model of Newman and Lowenstern (2002), but are mostly higher.…”

Section: Thermometry and Barometry From Minerals And Melt Inclusionsmentioning

confidence: 99%

“…According to this model, almost all the inclusions Table 6 Intrinsic variables calculated using a range of models (Andersen and Lindsley 1988;Beattie 1993;Ghiorso and Evans 2008;Harrison and Watson 1984;Papale et al 2006;Putirka 2005;Putirka et al 2003Putirka et al , 2007Sisson and Grove 1993;Spencer and Lindsley 1981) Oxide formulae recalculated according to Stormer (1983). Ilmenite-magnetite was calculated for a single touching pair.…”

Section: Evidence From Melt Inclusion Compositionsmentioning

confidence: 99%

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The 2011 eruption of Nabro volcano, Eritrea: perspectives on magmatic processes from melt inclusions

Donovan

Blundy

Oppenheimer

et al. 2017

Contrib Mineral Petrol

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The 2011 eruption of Nabro volcano, Eritrea, produced one of the largest volcanic sulphur inputs to the atmosphere since the 1991 eruption of Mt. Pinatubo, yet has received comparatively little scientific attention. Nabro forms part of an off-axis alignment, broadly perpendicular to the Afar Rift, and has a history of large-magnitude explosive silicic eruptions, as well as smaller more mafic ones. Here, we present and analyse extensive petrological data obtained from samples of trachybasaltic tephra erupted during the 2011 eruption to assess the pre-eruptive magma storage system and explain the large sulphur emission. We show that the eruption involved two texturally distinct batches of magma, one of which was more primitive and richer in sulphur than the other, which was higher in water (up to 2.5 wt%). Modelling of the degassing and crystallisation histories demonstrates that the more primitive magma rose rapidly from depth and experienced degassing crystallisation, while the other experienced isobaric cooling in the crust at around 5 km depth. Interaction between the two batches occurred shortly before the eruption. The eruption itself was likely triggered by recharge-induced destabilisation of vertically extensive mush zone under the volcano. This could potentially account for the large volume of sulphur released. Some of the melt inclusions are volatile undersaturated, and suggest that the original water content of the magma was around 1.3 wt%, which is relatively high for an intraplate setting, but consistent with seismic studies of the Afar plume. This eruption was smaller than some geological eruptions at Nabro, but provides important insights into the plumbing systems and dynamics of off-axis volcanoes in Afar.

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Section: Mineralmentioning

confidence: 99%

Section: Thermometry and Barometry From Minerals And Melt Inclusionsmentioning

confidence: 99%

Section: Evidence From Melt Inclusion Compositionsmentioning

confidence: 99%

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The 2011 eruption of Nabro volcano, Eritrea: perspectives on magmatic processes from melt inclusions

Donovan

Blundy

Oppenheimer

et al. 2017

Contrib Mineral Petrol

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“…Using the solubility model of Papale et al (2006), we then calculate the amount of vapour (wt %) in 180 the system at a given pressure and temperature, using the melt composition output from the MELTS model. That solubility model is compositionally dependant, which is significant given the intermediate composition of Ruapehu magmas.…”

mentioning

confidence: 99%

“…9 The effect of bubble growth on the magma volume (for 100 g of magma) as a function of pressure. The gas volume was calculated using the solubility model of Papale et al (2006) 930 and assuming an ideal gas mixture. i.e., bubbles are considered to have become elongated due to high shear stress within the upper conduit leading to a reduction of apparent viscosity.…”

mentioning

confidence: 99%

Rheological controls on the eruption potential and style of an andesite volcano: A case study from Mt. Ruapehu, New Zealand

Kilgour

Mader

Blundy

et al. 2016

Journal of Volcanology and Geothermal Research

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. AbstractThe evolving magma rheology of three recent Ruapehu eruptions (1969, 1977, and 1995) is estimated using a combination of thermodynamic models and rheological calculations, supported by textural observations of the erupted scoria. We use a well-established thermodynamic model to determine the composition of these representative Ruapehu magmas from 300 MPa to ∼ 30MPa. The outputs of the model provide the changing crystal and bubble content in a closed system (assuming no gas loss), as well as the fractionating melt compositions. We calculate the melt viscosity, and the effect of bubbles and crystals, to quantify the rheology of the magma during ascent (under assumed equilibrium conditions). The moderately high phenocryst content of Ruapehu scoria (∼ 30 %) means that only a small amount of additional microlite crystallisation (∼ 5 %) would result in a yield strength, which may lead the magma to stall. However, if the strain rates are high enough, more crystallisation would be possible without developing a yield stress. This suggests that microlite-rich magmas are almost certain to stall unless they encounter significant fluid addition from a source such as a hydrothermal system, groundwater, or surface water (i.e., Ruapehu's Crater Lake).Ruapehu magmas are initially H 2 O-undersaturated and as a consequence, crystallisation and bubble growth were suppressed until the magma achieved saturation, at ∼ 100 to 50 MPa.From this analysis, we suggest that Ruapehu magmas are more likely to erupt compared to magmas of a similar composition that are H 2 O-saturated. This partly explains the regular, albeit small-volume eruptions at Ruapehu and the propensity for phreatomagmatic eruptions when the magma:water ratio is low.

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Intermittent and efficient outgassing by the upward propagation of film ruptures in a bubbly magma

Namiki

Kagoshima

2014

J. Geophys. Res. Solid Earth

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We simulated the ascent of bubbly magma in a volcanic conduit by slow decompression experiments using syrup foam as a magma analogue. During decompression, some large voids appear in the foam. The expansion of one void deep in the foam leads to another void expansion, and the void expansion then propagates upward. The void expansion finally reaches the surface of the foam to originate outgassing. The velocity of the upward propagation of void expansions is essentially the same as the rupturing velocity of the bubble film, suggesting that the rupture of films separating each void propagates upward to create the pathway for outgassing. The calculated apparent permeability of decompressed foam can become higher than that measured for natural pumices/scoriae. The upward propagation of film ruptures thus allows for efficient outgassing. This may also appear as the mechanism for energetic gas emissions originating at a depth, such as Strombolian eruptions.

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The compositional dependence of the saturation surface of H2O+CO2 fluids in silicate melts

Cited by 498 publications

References 51 publications

The 2011 eruption of Nabro volcano, Eritrea: perspectives on magmatic processes from melt inclusions

The 2011 eruption of Nabro volcano, Eritrea: perspectives on magmatic processes from melt inclusions

Rheological controls on the eruption potential and style of an andesite volcano: A case study from Mt. Ruapehu, New Zealand

Intermittent and efficient outgassing by the upward propagation of film ruptures in a bubbly magma

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