| Abstract: | Chlorine (Cl) and carbon dioxide (CO2) are common magmatic volatiles with contrasting behaviors. CO2 solubility increases with pressure whereas Cl solubility shows relatively little pressure or temperature effect. CO2 speciation changes with silicate melt composition, dissolving as carbonate in basaltic magmas and molecular CO2 in more silicic compositions. In H2O-bearing systems, the strongly non-ideal behavior of alkali chlorides causes unmixing of the volatile phase to form a H2O-rich vapor and a hydrosaline phase with important implications for the maximum concentration of Cl in magmas. Addition of CO2 to magma hastens immiscibility at crustal pressures (<500 MPa), inducing the formation of CO2-rich vapors and Cl-rich hydrosaline melts. (C) 2000 Elsevier Science B.V. All rights reserved.Chlorine (Cl) and carbon dioxide (CO2) are common magmatic volatiles with contrasting behaviors. CO2 solubility increases with pressure whereas Cl solubility shows relatively little pressure or temperature effect. CO2 speciation changes with silicate melt composition, dissolving as carbonate in basaltic magmas and molecular CO2 in more silicic compositions. In H2O-bearing systems, the strongly non-ideal behavior of alkali chlorides causes unmixing of the volatile phase to form a H2O-rich vapor and a hydrosaline phase with important implications for the maximum concentration of Cl in magmas. Addition of CO2 to magma hastens immiscibility at crustal pressures (<500 MPa), inducing the formation of CO2-rich vapors and Cl-rich hydrosaline melts. |
| Genre: | Conference Paper |
| ProdID: | 70022698 |
| Citation Author: | Lowenstern, J. B. |
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| Citation End Page: | 290 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Geochemical Exploration |
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| Citation Number Of Pages: | 4 |
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| Citation Publisher: | Elsevier Science Publishers B.V. |
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| Citation Search Results Text: | A review of the contrasting behavior of two magmatic volatiles: Chlorine and carbon dioxide; 2000; Conference Paper; Journal of Geochemical Exploration; Lowenstern, J. B. |
| Citation Start Page: | 287 |
| Citation Volume: | 69-70 |
| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | A review of the contrasting behavior of two magmatic volatiles: Chlorine and carbon dioxide; 2000; Conference Paper; Journal of Geochemical Exploration; Lowenstern, J. B. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/S0375-6742(00)00075-3 |
| Date Other: | Sat, 1 Jan 2000 00:00 -0600 |
| Publisher: | Elsevier Science Publishers B.V. |
