Bubbles matter: An assessment of the contribution of vapor bubbles to melt inclusion volatile budgets

Moore, Lowell R.; Gazel, Esteban; Tuohy, Robin; Lloyd, A. S.; Esposito, Rosario; Steele‐MacInnis, Matthew; Hauri, E. H.; Wallace, Paul; Plank, Terry; Bodnar, Robert J.

doi:10.2138/am-2015-5036

Cited by 203 publications

(245 citation statements)

References 81 publications

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“…The majority of inclusion-hosted bubbles make up 3.0 ± 1.5(1σ) vol. % of total melt inclusion volumes, consistent with formation by thermal contraction (Lowenstern 1995;Moore et al 2015). In three inclusions, bubbles make up larger proportions (8-12 vol.…”

Section: Inclusion-hosted Bubblessupporting

confidence: 62%

“…If inclusion-hosted bubbles remain in equilibrium with coexisting trapped melts during cooling; then, CO 2 may be transferred into inclusion-hosted bubbles (Roedder 1979;Anderson and Brown 1993;Steele-Macinnis et al 2011;Bucholz et al 2013;Hartley et al 2014;Moore et al 2015). However, assuming that bubble-melt equilibrium is maintained within cooling, inclusions may not always be valid: rapid quenching kinetically inhibits CO 2 diffusion, resulting in reduced sequestration of CO 2 into bubbles (Neave et al 2014a;Wallace et al 2015).…”

Section: Inclusion-hosted Bubblesmentioning

confidence: 99%

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The evolution and storage of primitive melts in the Eastern Volcanic Zone of Iceland: the 10 ka Grímsvötn tephra series (i.e. the Saksunarvatn ash)

Neave

Maclennan

Thordarson

et al. 2015

Contrib Mineral Petrol

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evolved assemblage is close to being in equilibrium with the matrix glass, trace element disequilibrium between primitive and evolved assemblages indicates that they were derived from different distributions of mantle melt compositions. Juxtaposition of disequilibrium assemblages probably occurred during disaggregation of incompatible trace element-depleted mushes (mean La/Yb melt = 2.1) into aphyric and incompatible trace element-enriched liquids (La/Yb melt = 3.6) shortly before the growth of the evolved macrocryst assemblage. Post-entrapment modification of plagioclase-hosted melt inclusions has been minimal and high-Mg# inclusions record differentiation and mixing of compositionally variable mantle melts that are amongst the most primitive liquids known from the EVZ. Coupled highfield strength element (HFSE) depletion and incompatible trace element enrichment in a subset of primitive plagioclase-hosted melt inclusions can be accounted for by inclusion formation following plagioclase dissolution driven by interaction with plagioclase-undersaturated melts. Thermobarometric calculations indicate that final crystal-melt equilibration within the evolved assemblage occurred at ~1140 °C and 0.0-1.5 kbar. Considering the large volume of the erupted tephra and textural evidence for rapid crystallisation of the evolved assemblage, 0.0-1.5 kbar is considered unlikely to represent a pressure of long-term magma accumulation and storage. Multiple thermometers indicate that the primitive assemblage crystallised at high temperatures of 1240-1300 °C. Different barometers, however, return markedly different crystallisation depth estimates. Raw clinopyroxene-melt pressures of 5.5-7.5 kbar conflict with apparent melt inclusion entrapment pressures of 1.4 kbar. After applying a correction derived from published experimental data, clinopyroxene-melt equilibria return mid-crustal pressures of 4 ± 1.5 kbar, which are consistent with pressures estimated from the major element Abstract Major, trace and volatile elements were measured in a suite of primitive macrocrysts and melt inclusions from the thickest layer of the 10 ka Grímsvötn tephra series (i.e. Saksunarvatn ash) at Lake Hvítárvatn in central Iceland. In the absence of primitive tholeiitic eruptions (MgO > 7 wt%) within the Eastern Volcanic Zone (EVZ) of Iceland, these crystal and inclusion compositions provide an important insight into magmatic processes in this volcanically productive region. Matrix glass compositions show strong similarities with glass compositions from the AD 1783-1784 Laki eruption, confirming the affinity of the tephra series with the Grímsvötn volcanic system. content of primitive melt inclusions. Long-term storage of primitive magmas in the mid-crust implies that low CO 2 concentrations measured in primitive plagioclase-hosted inclusions (262-800 ppm) result from post-entrapment CO 2 loss during transport through the shallow crust. In order to reconstruct basaltic plumbing system geometries from petrological data with greater confidence, mineral-mel...

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Section: Inclusion-hosted Bubblessupporting

confidence: 62%

Section: Inclusion-hosted Bubblesmentioning

confidence: 99%

The evolution and storage of primitive melts in the Eastern Volcanic Zone of Iceland: the 10 ka Grímsvötn tephra series (i.e. the Saksunarvatn ash)

Neave

Maclennan

Thordarson

et al. 2015

Contrib Mineral Petrol

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“…While many contain a vapour bubble, some are bubble-free. Such bubbles may contain substantial concentrations of CO 2 which may result in underestimates of the original dissolved CO 2 (Moore et al 2015). We selected for analysis twelve large (≥ 30 µm in diameter) glassy, daughter mineral-free MI (Table 3).…”

Section: Xenolith Melt Inclusionsmentioning

confidence: 99%

Magma evolution beneath Bequia, Lesser Antilles, deduced from petrology of lavas and plutonic xenoliths

Camejo-Harry

Melekhova

Blundy

et al. 2018

Contrib Mineral Petrol

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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. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms Vol.:(0123456789) 1 3Contributions to Mineralogy and Petrology (2018) AbstractExtrusive and intrusive igneous rocks represent different parts of a magmatic system and ultimately provide complementary information about the processes operating beneath volcanoes. To shed light on such processes, we have examined and quantified the textures and mineral compositions of plutonic and cumulate xenoliths and lavas from Bequia, Lesser Antilles arc. Both suites contain assemblages of iddingsitized olivine, plagioclase, clinopyroxene and spinel with rare orthopyroxene and ilmenite. Mineral zoning is widespread, but more protracted in lavas than xenoliths. Plagioclase cores and olivine have high anorthite (An ≤ 98) and low forsterite (Fo ≤ 84) compositions respectively, implying crystallisation from a hydrous mafic melt that was already fractionated. Xenolith textures range from adcumulate to orthocumulate with variable mineral crystallisation sequences. Textural criteria are used to organize the xenoliths into six groups. Amphibole, notably absent from lavas, is a common feature of xenoliths, together with minor biotite and apatite. Bulk compositions of xenoliths deviate from the liquid line of descent of lavas supporting a cumulate origin with varying degrees of reactive infiltration by evolved hydrous melts, preserved as melt inclusions in xenolith crystals. Volatile saturation pressures in melt inclusions indicate cumulate crystallization over a 162-571 MPa pressure range under conditions of high dissolved water contents (up to 7.8 wt% H 2 O), consistent with a variety of other thermobarometric estimates. Phase assemblages of xenoliths are consistent with published experimental data on volatile-saturated low-magnesium and high-alumina basalts and basaltic andesite from the Lesser Antilles at pressures of 200-1000 MPa, temperatures of 950-1050 °C and dissolved H 2 O contents of 4-7 wt%. Once extracted from mid-crustal mushes, residual melts ascend to higher levels and undergo H 2 O-saturated crystallization in shallow, preeruptive reservoirs to form phenocrysts and glomerocrysts. The absence of amphibole from lavas reflects instability at low pressures, whereas its abundance in xenoliths testifies to its importance in mid-crustal differentiation processes. A complex, vertically extensive (6 to at least 21 km depth) magmatic system is inferred beneath Bequia. Xenoliths represent fragments of the mush incorporated into ascending magmas. The widespread occurrence of evolved melts in the mush, but the absence of erupted evolved magmas, in contrast to islands in the northern Lesser Antilles, may reflect the relative immaturity of the Bequia magmatic system.

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“…Such inclusions are usually significantly modified after entrapment during cooling and decompression and always contain a fluid (gas) bubble (e.g., Anderson and Brown, 1993;Danyushevsky et al, 2002). Thermodynamic modeling (Steele-MacInnes et al, 2011) and several studies of natural inclusions (e.g., Anderson and Brown, 1993;Kamenetsky et al, 2002Kamenetsky et al, , 2007Hartley et al, 2014;Wallace et al, 2015;Moore et al, 2015) have demonstrated that the bubbles can comprise a major fraction (80% or more) of the initial CO 2 content in the MIs, explaining the low CO 2 concentrations measured in the coexisting glasses.…”

Section: Introductionmentioning

confidence: 99%

“…The amount of CO 2 in the fluid phase is calculated from the ideal gas equation and saturation pressure at melt-glass transition (Shaw et al, 2010) or from the fluid density measured by cryometry (Naumov et al, 2006) or by Raman spectroscopy (e.g., Hartley et al, 2014;Moore et al, 2015). This approach has a number of uncertainties arising from the determination of the fluid density (e.g., Hartley et al, 2014) and the volume proportions in MIs, which sometimes contain an excessive ("prisoner") fluid phase trapped with melt, and from the common precipitation of carbonates on the bubble wall (e.g., Kamenetsky et al, 2002;Moore et al, 2015). An alternative, direct approach is an experimental homogenization of MIs leading to a complete dissolution of CO 2 back into the melt and enabling the direct analysis of CO 2 concentration in the quenched glass (e.g., .…”

Section: Introductionmentioning

confidence: 99%

Quantification of the CO 2 budget and H 2 O–CO 2 systematics in subduction-zone magmas through the experimental hydration of melt inclusions in olivine at high H 2 O pressure

Mironov

Portnyagin

Botcharnikov

et al. 2015

Earth and Planetary Science Letters

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Bubbles matter: An assessment of the contribution of vapor bubbles to melt inclusion volatile budgets

Cited by 203 publications

References 81 publications

The evolution and storage of primitive melts in the Eastern Volcanic Zone of Iceland: the 10 ka Grímsvötn tephra series (i.e. the Saksunarvatn ash)

The evolution and storage of primitive melts in the Eastern Volcanic Zone of Iceland: the 10 ka Grímsvötn tephra series (i.e. the Saksunarvatn ash)

Magma evolution beneath Bequia, Lesser Antilles, deduced from petrology of lavas and plutonic xenoliths

Quantification of the CO 2 budget and H 2 O–CO 2 systematics in subduction-zone magmas through the experimental hydration of melt inclusions in olivine at high H 2 O pressure

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