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Melting Relationships in the System NaAlSi_3O_8-NaCl-H_2O at One Kilobar Pressure, with Petrological Applications

van Groos, A. F. Koster and Wyllie, P. J. (1969) Melting Relationships in the System NaAlSi_3O_8-NaCl-H_2O at One Kilobar Pressure, with Petrological Applications. Journal of Geology, 77 (5). pp. 581-605. ISSN 0022-1376. https://resolver.caltech.edu/CaltechAUTHORS:20160209-093518164

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Abstract

Phase relationships in the system NaAlSi_3O_8-NaCl-H_2O appear to be ternary between 850° C and 950° C at 1 kbar pressure. A two-phase field containing NaCl-rich liquid and H_2O-rich vapor extends from the system NaCl-H_2O into the ternary system, although this field was not intersected by the joins investigated. In the system NaAlSi_3O_8-H_2O a wide miscibility gap occurs between liquid and vapor; in the system NaAlS_2O_8-NaCl a wide miscibility gap extends between silicate-rich liquid and NaCl-rich liquid at temperatures above 1,100° C at 1 bar pressure and also by inference at 1 kbar pressure. Both miscibility gaps are connected through the ternary system, separating a silicate liquid from a fluid phase with composition close to the join NaCl-H_2O and containing a small, unknown proportion of dissolved silicates. A temperature minimum is present on the ternary liquidus at 873 ± 5° C, representing the reaction: Albite+Fluid (H_2O-Nacl) ⇔ Liquid_(Albite) (1) The liquid composition, in terms of the anhydrous components, is approximately 99.7 wt percent NaAlSi_3O_8, 0.3 wt percent NaCl; its H_2O content is about 10 wt percent. It is expected that at lower pressures two additional reactions will occur: Albite+Vapor=Liquid_(Albite)+Liquid_(Nacl) (2) and Albite+Liquid_(Nacl)+Vapor; ⇔ Liquid_(Albite). (3) The results contrast with those in the system NaAlSi_3O_8-NaF-H_2O and confirm previous conclusions from the systems NaAlSi_3O_8-HCL-H_2O and NaAlSi_3O_8-HF-H_2O. Whereas fluoride (or NaF) tends to remain in the liquid (magma), chlorine (or NaCl) passes preferentially into the vapor or fluid phase. The solubility of H2O in a silicate melt increases when a small quantity of chlorine is present. Coexistence of H_2O-rich liquid inclusions and NaCl-rich liquid inclusions in crystalline phases in igneous rocks may indicate low-pressure conditions (<1 kbar) during capture of the inclusions.


Item Type:Article
Related URLs:
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http://dx.doi.org/10.1086/627455DOIArticle
http://www.jstor.org/stable/30062253JSTORArticle
Alternate Title:Melting Relationships in the System NaAlSi3O8-NaCl-H2O at One Kilobar Pressure, with Petrological Applications
Additional Information:© 1969 University of Chicago Press. Manuscript received November 4, 1968; revised January 31, 1969. We are indebted to G. W. Franz, A. J. Piwinskii, and D. H. Watkinson for many helpful discussions during the course of this research. We thank R. F. Mueller for reviewing the manuscript. The National Science Foundation supported this work with the grants GP-4910 and GA-1289.
Funders:
Funding AgencyGrant Number
NSFGP-4910
NSFGA-1289
Issue or Number:5
Record Number:CaltechAUTHORS:20160209-093518164
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160209-093518164
Official Citation:A. F. Koster van Groos , and P. J. Wyllie . "Melting Relationships in the System NaAlSi3O8-NaCl-H2O at One Kilobar Pressure, with Petrological Applications." The Journal of Geology 1969; 77(5), 581-605.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64327
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Feb 2016 19:54
Last Modified:02 Jun 2020 17:38

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