Solubility of H2O and CO2 in ultrapotassic melts at 1200 and 1250  C and pressure from 50 to 500 MPa

Behrens, Harald; Misiti, Valeria; Freda, Carmela; Vetere, Francesco; Botcharnikov, Roman E.; Scarlato, Piergiorgio

doi:10.2138/am.2009.2796

Cited by 129 publications

(112 citation statements)

References 63 publications

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“…The increase in peak intensity is witnessing an increase in CO 2 solubility with increasing pressure, as anticipated (e.g. Blank and Brooker, 1994;Thibault and Holloway, 1994;Brooker et al, 1999;Morizet et al, 2002;Botcharnikov et al, 2005Botcharnikov et al, , 2006Behrens et al, 2009). …”

Section: Co 2 Content Determined Via Micro-raman Spectroscopysupporting

confidence: 72%

“…For instance, several recent studies have shown the co-existence of CO 2 -rich (several wt.% CO 2 ) nephelinite silicate melts (40-50 wt.% SiO 2 and >20 wt.% Na 2 O+K 2 O) with carbonatite melts in natural melt inclusions collected at Oldoinyo Lengai volcano (Mitchell, 2009;Mitchell and Dawson, 2012;De Moor et al, 2013) The role of intensive parameters (T,P) on either CO 2 or H 2 O solubilities and speciations in silicate melts are well constrained (e.g. Blank and Brooker, 1994;Dixon et al, 1995a;Morizet et al, 2002Morizet et al, , 2010Behrens et al, 2009;Lesne et al, 2011a,b). The effect of melt composition is also reasonably well understood, and available studies cover various types of compositions ranging from basalts and affiliates (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Fogel and Rutherford, 1990;Blank et al, 1993;Tamic et al, 2001;Duncan and Dasgupta, 2014) and silica undersaturated melts (e.g. Brey and Green, 1976;Thibault and Holloway, 1994;Brooker et al, 2001a;Behrens et al, 2009). As a result, several thermodynamic and/or empirical models with the scope of predicting the CO 2 solubility as function of compositional and intensive parameters have been proposed (Dixon, 1997;Papale, 1999;Brooker et al, 2001a;Newman and Lowenstern, 2002;Papale et al, 2006;Lesne et al, 2011b, IaconoMarziano et al, 2012.…”

Section: Introductionmentioning

confidence: 99%

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Carbon dioxide in silica-undersaturated melt. Part I: The effect of mixed alkalis (K and Na) on CO2 solubility and speciation

Morizet

Paris

Gaillard

et al. 2014

Geochimica et Cosmochimica Acta

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Section: Co 2 Content Determined Via Micro-raman Spectroscopysupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Carbon dioxide in silica-undersaturated melt. Part I: The effect of mixed alkalis (K and Na) on CO2 solubility and speciation

Morizet

Paris

Gaillard

et al. 2014

Geochimica et Cosmochimica Acta

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“…This experiment has the highest water content (2.5 wt% H 2 O) by at least a factor of 2, as well as a much higher carbon content. This sample appears to confirm that water-rich melts can dissolve more carbon by increasing depolymerization of the melt structure, which leads to an increase in carbonate group solubility (28). GG-14 was not included in the linear regressions because it has a much higher water content than data indicate for planetary basalts.…”

mentioning

confidence: 90%

Degassing of reduced carbon from planetary basalts

Wetzel

Rutherford

Jacobsen

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

100

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Degassing of planetary interiors through surface volcanism plays an important role in the evolution of planetary bodies and atmospheres. On Earth, carbon dioxide and water are the primary volatile species in magmas. However, little is known about the speciation and degassing of carbon in magmas formed on other planets (i.e., Moon, Mars, Mercury), where the mantle oxidation state [oxygen fugacity (fO 2 )] is different from that of the Earth. Using experiments on a lunar basalt composition, we confirm that carbon dissolves as carbonate at an fO 2 higher than -0.55 relative to the iron wustite oxygen buffer (IW-0.55), whereas at a lower fO 2 , we discover that carbon is present mainly as iron pentacarbonyl and in smaller amounts as methane in the melt. The transition of carbon speciation in mantle-derived melts at fO 2 less than IW-0.55 is associated with a decrease in carbon solubility by a factor of 2. Thus, the fO 2 controls carbon speciation and solubility in mantle-derived melts even more than previous data indicate, and the degassing of reduced carbon from Fe-rich basalts on planetary bodies would produce methane-bearing, CO-rich early atmospheres with a strong greenhouse potential.hydrogen | iron carbonyl | magmatic volatiles | experimental petrology M agmas formed through igneous processes on parent bodies in the early solar system span 12 log units in oxidation state, from 6.3 log units of oxygen fugacity (fO 2 ) below the iron wustite oxygen buffer (IW) to 6 log units above the IW (IW−6.3 to IW+6) (1-4). Over the wide range of basalt fO 2 observed in these planetary bodies, thermodynamic data for the C-O-H gas system indicate that there are significant changes in gas phase speciation (5). These differences should be reflected in how volatiles are dissolved in magmas, but carbon speciation experiments for basaltic systems are limited, particularly at low fO 2 . The developing evidence for volatiles in magmas erupted on the Moon (6, 7) as well as on Earth (3,8), Mars (9-12), and Mercury (13) is a strong incentive to improve our understanding of C-O-H speciation and solubility in planetary basaltic magmas.Previous experimental studies on the speciation of carbon in Fe-free silicate systems under reducing conditions or at fO 2 < IW show carbon is dissolved as methane (14-16). However, under more oxidizing conditions in basaltic melt compositions, carbon is dissolved as carbonate (17)(18)(19), and the transition in speciation from methane to carbonate has long been debated as either occurring at more reducing conditions than IW+1 (20, 21) or at more oxidizing conditions (15). Another study (22) shows that a significant amount of C 4+ (carbonate) can be incorporated at extremely low fO 2 (IW−4.5) if Fe and alkalis are present in the melt. Additional experiments on Fe-bearing basalt are clearly required to resolve the conflicts in existing data. The results are important in understanding the residence time of carbon in the mantle and the rate of carbon degassing during the early evolution of terrestrial planets ...

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“…For example, Lesne et al (2011) found twice higher CO 2 solubility in alkali basalts compared with mid ocean ridge melts, and Behrens et al (2009) also found a higher CO 2 capacity in phono-tephritic melt, which they explained as a consequence of high K content. At a given pressure and temperature, Brooker et al (2001) proposed that the solubility of CO 2 is a strong function of the "non-bridging oxygen" (NBO) content of the melt, expressed as the NBO/T ratio, where T represents tetrahedral network-forming cations.…”

Section: The Effects Of Slab-derived Comentioning

confidence: 99%

Geochemistry of primary-carbonate bearing K-rich igneous rocks in the Awulale Mountains, western Tianshan: Implications for carbon-recycling in subduction zone

Yang

Niu

Shan

et al. 2014

Geochimica et Cosmochimica Acta

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Solubility of H2O and CO2 in ultrapotassic melts at 1200 and 1250 C and pressure from 50 to 500 MPa

Cited by 129 publications

References 63 publications

Carbon dioxide in silica-undersaturated melt. Part I: The effect of mixed alkalis (K and Na) on CO2 solubility and speciation

Carbon dioxide in silica-undersaturated melt. Part I: The effect of mixed alkalis (K and Na) on CO2 solubility and speciation

Degassing of reduced carbon from planetary basalts

Geochemistry of primary-carbonate bearing K-rich igneous rocks in the Awulale Mountains, western Tianshan: Implications for carbon-recycling in subduction zone

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