Experimental determination of H2O loss from melt inclusions during laboratory heating: Evidence from Raman spectroscopy

Severs, Matthew J.; Azbej, T.; Thomas, Jay B.; Mandeville, Charles W.; Bodnar, Robert J.

doi:10.1016/j.chemgeo.2006.07.008

Cited by 91 publications

(59 citation statements)

References 40 publications

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“…or H 2 O through the host crystal (Danyushevsky et al 2002;Hauri 2002;Portnyagin et al 2008) can also cause such dispersion. Significant diffusive loss of H 2 O has been shown experimentally to result in the formation of shrinkage vapour bubbles (Severs et al 2007) and is expected to cause crystallisation of daughter crystals or decrepitation within the inclusion (Danyushevsky et al 2002). As mentioned above, these features can be observed in some Volcán de Colima melt inclusions, but such inclusions were not analysed in this study.…”

Section: Textural and Chemical Indications Of Post-entrapment Modificmentioning

confidence: 77%

Volatiles contents, degassing and crystallisation of intermediate magmas at Volcan de Colima, Mexico, inferred from melt inclusions

Reubi

Blundy

Varley

2013

Contrib Mineral Petrol

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In volatile-saturated magmas, degassing and crystallisation are interrelated processes which influence the eruption style. Melt inclusions provide critical information on volatile and melt evolution, but this information can be compromised significantly by post-entrapment modification of the inclusions. We assess the reliability and significance of pyroxene-hosted melt inclusion analyses to document the volatile contents (particularly H 2 O) and evolution of intermediate arc magmas at Volcán de Colima, Mexico. The melt inclusions have maximal H 2 O contents (B4 wt%) consistent with petrological estimates and the constraint that the magmas crystallised outside the amphibole stability field, demonstrating that pyroxenehosted melt inclusions can preserve H 2 O contents close to their entrapment values even in effusive eruptions with low effusion rates (0.6 m 3 s -1 ). The absence of noticeable H 2 O loss in some of the inclusions requires post-entrapment diffusion coefficients (B1 9 10 -13 m 2 s -1 ) at least several order of magnitude smaller than experimentally determined H ? diffusion coefficient in pyroxenes. The H 2 O content distribution is, however, not uniform, and several peaks in the data, interpreted to result from diffusive H 2 O reequilibration, are observed around 1 and 0.2 wt%. H 2 O diffusive loss is also consistent with the manifest lack of correlations between H 2 O and CO 2 or S contents. The absence of textural evidence supporting post-entrapment H 2 O loss suggests that diffusion most likely occurred via melt channels prior to sealing of the inclusions, rather than through the host crystals. Good correlation between the melt inclusion sealing and volcano-tectonic seismic swarm depths further indicate that, taken as a whole, the melt inclusion population accurately records the pre-eruptive conditions of the magmatic system. Our data demonstrate that H 2 O diffusive loss is a second-order process and that pyroxene-hosted melt inclusions can effectively record the volatile contents and decompression-induced crystallisation paths of vapoursaturated magmas.

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Section: Textural and Chemical Indications Of Post-entrapment Modificmentioning

confidence: 77%

Volatiles contents, degassing and crystallisation of intermediate magmas at Volcan de Colima, Mexico, inferred from melt inclusions

Reubi

Blundy

Varley

2013

Contrib Mineral Petrol

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“…This allowed the melting to be kept at an almost equilibrium condition such that the measured temperatures were close to the actual temperatures at this slow rate of heating [34]. Also, the duration time of heating in our homogenization experiments was normally kept at less than 6 h, so that the possibility of fluid leakage from CIs was minimized greatly when compared with those in the experiments using coldsealed pressure vessels with long heating durations [35].…”

Section: Experimental Methodsmentioning

confidence: 99%

Homogenization Experiments of Crystal-Rich Inclusions in Spodumene from Jiajika Lithium Deposit, China, under Elevated External Pressures in a Hydrothermal Diamond-Anvil Cell

Chou

2017

Geofluids

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Extensive studies of the crystal-rich inclusions (CIs) hosted in minerals in pegmatite have resulted in substantially different models for the formation mechanism of the pegmatite. In order to evaluate these previously proposed formation mechanisms, the total homogenization processes of CIs hosted in spodumene from the Jiajika pegmatite deposit in Sichuan, China, were observed in situ under external H 2 O pressures in a new type of hydrothermal diamond-anvil cell (HDAC). The CIs in a spodumene chip were loaded in the sample chamber of HDAC with water, such that the CIs were under preset external H 2 O pressures during heating to avoid possible decrepitation. Our in situ observations showed that the crystals within the CIs were dissolved in carbonic-rich aqueous fluid during heating and that cristobalite was usually the first mineral being dissolved, followed by zabuyelite and silicate minerals until their total dissolution at temperatures between 500 and 720 ∘ C. These observations indicated that the minerals within the CIs were daughter minerals crystallized from an entrapped carbonate-and silica-rich aqueous solution and therefore provided useful information for evaluating the formation models of granitic pegmatites.

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“…In particular, diffusion of H + through the host resulting in loss of H 2 O (Massare et al, 2002;Severs et al, 2007;Gaetani et al, 2012;Bucholz et al, 2013), and post-entrapment crystallization (PEC) (Danyushevsky et al, 2002;SteeleMacInnis et al, 2011) can affect the composition of the melt (glass) in the MI. These combined effects can produce misleading trends in the H 2 O-CO 2 content of the glass phase that are similar to those produced as a result of magma degassing (Gaetani et al, 2012;Steele-MacInnis et al, 2011;Bucholz et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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

Moore

Gazel

Tuohy

et al. 2015

American Mineralogist

204

203

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Experimental determination of H2O loss from melt inclusions during laboratory heating: Evidence from Raman spectroscopy

Cited by 91 publications

References 40 publications

Volatiles contents, degassing and crystallisation of intermediate magmas at Volcan de Colima, Mexico, inferred from melt inclusions

Volatiles contents, degassing and crystallisation of intermediate magmas at Volcan de Colima, Mexico, inferred from melt inclusions

Homogenization Experiments of Crystal-Rich Inclusions in Spodumene from Jiajika Lithium Deposit, China, under Elevated External Pressures in a Hydrothermal Diamond-Anvil Cell

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

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