Chemically driven growth and resorption of bubbles in a multivolatile magmatic system

Yoshimura, Shumpei; Nakamura, Michihiko

doi:10.1016/j.chemgeo.2010.05.010

Cited by 24 publications

(25 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This buffers the degree of volatile supersaturation in the melt and delays bubble nucleation (Mangan and Sisson 2000). Bubble growth is prevented and previously-formed bubbles may resorb (Yoshimura and Nakamura 2010). In our variable rate decompression experiments, diffusive volatile transport toward the gas-melt interface is demonstrated by the spatial distributions of H 2 O and CO 2 (Fig.…”

Section: Bubble Nucleation In Basaltic Meltsmentioning

confidence: 80%

Generation of CO2-rich melts during basalt magma ascent and degassing

Pichavant

Carlo

Rotolo

et al. 2013

Contrib Mineral Petrol

View full text Add to dashboard Cite

To testmechanisms of basalticmagma degassing,\ud continuous decompressions of volatile-bearing (2.7–3.8 wt%\ud H2O, 600–1,300 ppm CO2) Stromboli melts were performed\ud from 250–200 to 50–25 MPa at 1,180–1,140 C.Ascent rates\ud were varied from 0.25 to *1.5 m/s. Glasses after decompression\ud show a wide range of textures, from totally bubblefree\ud to bubble-rich, the latter with bubble number densities\ud from 104 to 106 cm-3, similar to Stromboli pumices. Vesicularities\ud range from 0 to *20 vol%. Final melt H2O concentrations\ud are homogeneous and always close to solubilities.\ud In contrast, the rate of vesiculation controls the finalmelt CO2\ud concentration. High vesicularity charges have glass CO2\ud concentrations that follow theoretical equilibrium degassing\ud paths, whereas glasses from low vesicularity charges show\ud marked deviations from equilibrium, with CO2 concentrations\ud up to one order of magnitude higher than solubilities.\ud FTIR profiles and maps reveal glass CO2 concentration gradients\ud near the gas–melt interface. Our results stress the\ud importance of bubble nucleation and growth, and of volatile\ud diffusivities, for basaltic melt degassing. Two characteristic\ud distances, the gas interface distance (distance either between\ud bubbles or to gas–melt interfaces) and the volatile diffusion\ud distance, control the degassing process. Melts containing\ud numerous and large bubbles have gas interface distances\ud shorter than volatile diffusion distances, and degassing proceeds\ud by equilibrium partitioning of CO2 and H2O between\ud melt and gas bubbles. For melts where either bubble nucleation\ud is inhibited or bubble growth is limited, gas interface\ud distances are longer than volatile diffusion distances.\ud Degassing proceeds by diffusive volatile transfer at the gas–\ud melt interface and is kinetically limited by the diffusivities of\ud volatiles in the melt. Our experiments show that CO2-oversaturated\ud melts can be generated as a result of magma\ud decompression. They provide a new explanation for the\ud occurrence of CO2-rich natural basaltic glasses and open new\ud perspectives for understanding explosive basaltic volcanism

show abstract

Section: Bubble Nucleation In Basaltic Meltsmentioning

confidence: 80%

Generation of CO2-rich melts during basalt magma ascent and degassing

Pichavant

Carlo

Rotolo

et al. 2013

Contrib Mineral Petrol

View full text Add to dashboard Cite

show abstract

“…Such kinetic fractionation was first pointed out by Watson et al (1982), and then it was incorporated into a degassing model (Gonnermann and Manga, 2005). Recent experimental studies have demonstrated that CO 2 -rich melts are generated through this disequilibrium effect (Yoshimura and Nakamura, 2010;Pichavant et al, 2010). In order to use H 2 O-CO 2 systematics in volcanology and igneous petrology, the extent to which diffusive fractionation may explain the high CO 2 /H 2 O ratio should be elucidated quantitatively.…”

Section: Accepted Manuscriptmentioning

confidence: 97%

Diffusive fractionation of H2O and CO2 during magma degassing

Yoshimura

2015

Chemical Geology

Self Cite

View full text Add to dashboard Cite

“…6 5 H 2 O (c) 0.66 CO 2 0.00 Total (d) 100.00 Table 1. Chemical compositions of starting material (a) Data from Yoshimura and Nakamura (2010). (b) Total Fe as FeO.…”

Section: Piston Cylinder Experiments and Volatile Analysesmentioning

confidence: 99%

Carbonate ions in high-SiO<sub>2</sub> rhyolite observed in fluid-melt equilibrium experiments

2017

Self Cite

View full text Add to dashboard Cite

bility data for high-SiO 2 rhyolite under pressures higher than 0.66 GPa are lacking. Although recent solubility models have predicted the CO 2-H 2 O solubility under highpressure conditions (e.g., Papale et al., 2006; Duan, 2014; Ghiorso and Gualda, 2015), additional experimental data are necessary to examine validity of these models. In addition, the possibility that CO 3 2may be present in high-SiO 2 rhyolite (Moore et al., 2008) is still controversial and needs re-examination. In this paper, we present new experimental results of CO 2-H 2 O solubility in a high-SiO 2 rhyolitic melt (SiO 2 = 77.8 wt%) at 850 and 1200∞C and at 0.1-1.5 GPa. We then discuss the solubility and speciation of the experimental products.

show abstract

Chemically driven growth and resorption of bubbles in a multivolatile magmatic system

Cited by 24 publications

References 41 publications

Generation of CO2-rich melts during basalt magma ascent and degassing

Generation of CO2-rich melts during basalt magma ascent and degassing

Diffusive fractionation of H2O and CO2 during magma degassing

Carbonate ions in high-SiO<sub>2</sub> rhyolite observed in fluid-melt equilibrium experiments

Contact Info

Product

Resources

About