Carbon dioxide and argon diffusion in silicate melts: Insights into the CO2 speciation in magmas

Spickenbom, K.; Sierralta, Melanie; Nowak, Marcus

doi:10.1016/j.gca.2010.08.022

Cited by 38 publications

(27 citation statements)

References 47 publications

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“…Faster diffusing species will fill the bubbles preferentially if the system does not come to equilibrium. CO 2 diffusion does not vary much with anhydrous melt composition (Watson 1994;Nowak et al 2004;Spickenbom et al 2010;Zhang and Ni 2010). In water-poor rhyolitic to andesitic melts CO 2 diffusivity is intermediate between those of sulfur and H 2 O, while in basaltic melts S and CO 2 diffusivities are very similar.…”

Section: Comparison To Diffusion Of Other Volatilesmentioning

confidence: 86%

“…A more comprehensive comparison between noble gas diffusion and sulfur diffusion is possible for melts with albitic compositions since the whole range of noble gases from He to Xe has been studied (Shelby and Eagan 1976;Roselieb et al 1992Roselieb et al , 1995Carroll 1991;Carroll et al 1993;Spickenbom et al 2010). A clear trend of decreasing diffusivity with increasing size of the noble gases has been established, but diffusion of all of these elements is much faster than sulfur diffusion measured by Winther et al (1998).…”

Section: Comparison To Diffusion Of Other Volatilesmentioning

confidence: 99%

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Diffusion and Redox Reactions of Sulfur in Silicate Melts

Behrens

Stelling

2011

Reviews in Mineralogy and Geochemistry

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Section: Comparison To Diffusion Of Other Volatilesmentioning

confidence: 86%

Section: Comparison To Diffusion Of Other Volatilesmentioning

confidence: 99%

Diffusion and Redox Reactions of Sulfur in Silicate Melts

Behrens

Stelling

2011

Reviews in Mineralogy and Geochemistry

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“…andesite, jadeite and phonolite) both molecular and carbonate species are identified (Brooker et al, 1999;King and Holloway, 2002;Morizet et al, 2002;Behrens et al, 2004b;Botcharnikov et al, 2006). Furthermore, Morizet et al (2001Morizet et al ( , 2007 ,and Porbatzki and Nowak (2001), Nowak et al (2003) and Spickenbom et al (2010) in studying various silicate compositions (jadeite, albite, dacite and phonolite) have convincingly demonstrated that the speciation preserved in quenched melts below the glass transition temperature changes with the annealing temperature and is different from the true speciation occurring in the melt in equilibrium at superliquidus temperature. As the concentration of molecular CO2 increases with a higher annealing temperature, the concentration of molecular CO2 in the equilibrated liquid is likely much higher than the one observed in the glass.…”

Section: Solubilitymentioning

confidence: 94%

Carbon dioxide in silicate melts: A molecular dynamics simulation study

Guillot

Sator

2011

Geochimica et Cosmochimica Acta

124

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The distribution, recycling and storage of carbon in the Earth are of fundamental importance to understand the global carbon cycle between the deep Earth and near surface reservoirs. Degassing of CO2 at mid-ocean ridges may give information on the source region but the very low solubility of CO2 in tholeitic basalts has for consequence that near all Mid-Ocean Ridge Basalts glasses exsolve their CO2 rich vapor at shallow depth as they approach the ocean floor. Hence their CO2 contents mostly represent the pressure at eruption and not the source region. Recent petrological investigations have shown that the presence of carbonates at depth in the upper mantle has a large effect on the solidus of carbonated silicates by inducing incipient melting at much lower temperature. So the role of carbon-rich melts at great depth is now becoming a credible scenario to explain the extraction of CO2 from the source region to the surface. During the last three decades many studies have been devoted to measure the solubility of CO2 in silicate melts of various composition. But due to experimental difficulties these studies were generally restricted to low and moderate pressures (below ~20 kbar). By performing a series of molecular dynamics simulation where a supercritical CO2 phase is in contact with a silicate melt of various composition (from felsic to ultrabasic) at different temperatures (1473-2273K) and pressures (20-150kbar), we have been able to evaluate the solubility of CO2, the population of molecular and carbonate species, their diffusivity through the melt and the local structure. We show that this kind of molecular simulation is a useful theoretical guide to better understand the behavior of CO2 in magmas at depth.Comment: 109 pages, 14 figures. To be published in Geochimica et Cosmochimica Act

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“…High-temperature advancement of the IHPV furnace allows maximum temperature of 1500 °C, a pressure of 500 MPa can be reached routinely (e.g., Nowak et al 2004), and samples can be quenched rapidly within seconds. This allows investigating the physicochemical properties of even strongly depolymerized tholeiitic and alkalirich volatile-bearing basaltic systems (e.g., Berndt et al 2002;Stelling et al 2008;Giordano et al 2008;Freise et al 2009;Spickenbom et al 2010). The piezoelectric driven valve was tested successfully to a pressure load of 500 MPa.…”

Section: First Continuous Decompression Experimentsmentioning

confidence: 99%

A new type of high-pressure low-flow metering valve for continuous decompression: First experimental results on degassing of rhyodacitic melts

Nowak

Cichy

Botcharnikov

et al. 2011

American Mineralogist

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A novel type of high-pressure low-flow metering valve has been designed for experiments at continuous decompression in internally heated pressure vessels (IHPV) at pressures up to 500 MPa and temperatures up to 1500 °C. It consists of a modified high-pressure valve coupled with a piezoelectric nanopositioning system. The piezoelectric actuator (1) positions the needle of the valve statically with very high precision on a nanometer scale for infinitesimally slow decompression and, alternatively, (2) opens and closes the valve completely, within milliseconds, to achieve a fast pressure drop only limited by the diameter of the high-pressure tubing and the entire volume of the autoclave system.The valve connected to an IHPV has been successfully tested to simulate continuous decompression of volatile-bearing magma. Water saturated rhyodacitic melt was synthesized at 1050 °C and 300 MPa and subsequently decompressed to 50 MPa at an integrated decompression rate of 0.28 MPa/s using continuous decompression as well as single-step and multi-step decompression techniques. The experimental results of the three methods show significant differences, having important implications for the interpretation of textures observed in natural volcanic rocks. Bubble number density (BND) values increase from continuous to multi-step and to single-step decompression by two orders of magnitude. Bubble size distribution (BSD) also differs significantly. The BSD curve of the singlestep decompression shows largest variation both in size and in population number density, whereas the BSD trend for the sample of multi-step decompression shows the smallest variation between size and population density of bubbles. The BSD of the continuously decompressed sample indicates similar proportions of bubbles with different size. Channel formation in the sample of single-step decompression may indicate fluid escape from over-pressurized bubbles through the melt. Singlestep and continuous decompression style represent two extreme cases of magma degassing in which bubble nucleation and bubble growth are predominant processes, respectively, whereas multi-step decompression resembles the intermediate case.

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Carbon dioxide and argon diffusion in silicate melts: Insights into the CO2 speciation in magmas

Cited by 38 publications

References 47 publications

Diffusion and Redox Reactions of Sulfur in Silicate Melts

Diffusion and Redox Reactions of Sulfur in Silicate Melts

Carbon dioxide in silicate melts: A molecular dynamics simulation study

A new type of high-pressure low-flow metering valve for continuous decompression: First experimental results on degassing of rhyodacitic melts

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