caa a22 4500 465791069 CHVBK 20180323112024.0 cr unu---uuuuu 170327e19900701xx s 000 0 eng 10.1007/BF01575626 doi (NATIONALLICENCE)springer-10.1007/BF01575626 Carbon isotopic fractionation between CO2 vapour, silicate and carbonate melts: an experimental study to 30 kbar [Elektronische Daten] [David Mattey, W. Taylor, D. Green, C. Pillinger] The carbon isotopic fractionation between CO2 vapour and sodamelilite (NaCaAlSi2O7) melt over a range of pressures and temperatures has been investigated using solid-media piston-cylinder high pressure apparatus. Ag2C2O4 was the source of CO2 and experimental oxygen fugacity was buffered at hematite-magnetite by the double capsule technique. The abundance and isotopic composition of carbon dissolved in sodamelilite (SM) glass were determined by stepped heating and the δ13C of coexisting vapour was determined directly by capsule piercing. CO2 solubility in SM displays a complex behavior with temperature. At pressures up to 10 kbars CO2 dissolves in SM to form carbonate ion complexes and the solubility data suggest slight negative temperature dependence. Above 20 kbars CO2 reacts with SM to form immiscible Na-rich silicate and Ca-rich carbonate melts and CO2 solubility in Na-enriched silicate melt rises with increasing temperature above the liquidus. Measured values for carbon isotopic fractionation between CO2 vapour and carbonate ions dissoived in sodamelilite melt at 1200°-1400° C and 5-30 kbars average 2.4±0.2‰, favouring13C enrichment in CO2 vapour. The results are maxima and are independent of pressure and temperature. Similar values of ≈2‰ are obtained for the carbon isotopic fractionation between CO2 vapour and carbonate melts at 1300°-1400° C and 20-30 kbars. Springer-Verlag, 1990 Mattey David Department of Geology, Royal Holloway and Bedford New college, Egham Hill, TW20 OEX, Egham, United Kingdom aut Taylor W. Department of Geology, University of Tasmania, P.O. Box 252C, 7001, Hobart, Australia aut Green D. Department of Geology, University of Tasmania, P.O. Box 252C, 7001, Hobart, Australia aut Pillinger C. Department of Earth Sciences, The Open University, Walton Hall, MK7 6AA, Milton Keynes, United Kingdom aut Contributions to Mineralogy and Petrology Springer-Verlag 104/4(1990-07-01), 492-505 0010-7999 104:4<492 1990 104 410 https://doi.org/10.1007/BF01575626 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01575626 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mattey David Department of Geology, Royal Holloway and Bedford New college, Egham Hill, TW20 OEX, Egham, United Kingdom aut NATIONALLICENCE 700 1- Taylor W. Department of Geology, University of Tasmania, P.O. Box 252C, 7001, Hobart, Australia aut NATIONALLICENCE 700 1- Green D. Department of Geology, University of Tasmania, P.O. Box 252C, 7001, Hobart, Australia aut NATIONALLICENCE 700 1- Pillinger C. Department of Earth Sciences, The Open University, Walton Hall, MK7 6AA, Milton Keynes, United Kingdom aut NATIONALLICENCE 773 0- Contributions to Mineralogy and Petrology Springer-Verlag 104/4(1990-07-01), 492-505 0010-7999 104:4<492 1990 104 410 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer