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Published in:
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2014 | OriginalPaper | Chapter

6. System CaO–MgO–Al2O3–SiO2 Saturated with Silica

Author : Professor Tibor Gasparik

Published in: Phase Diagrams for Geoscientists

Publisher: Springer New York

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Abstract

The silica–saturated CMAS system includes assemblages with anorthite, kyanite, and quartz or coesite. Clinopyroxene coexisting with such silica–rich phases can dissolve an excess of silica charge balanced by vacancies in the M2 site. Such “non-stoichiometric” pyroxenes were first reported by Eskola [165] and synthesized by Mao [313]. Other natural occurrences were reported by Smyth [416] and McCormick [317]. The compositions of clinopyroxene with vacancies can be extrapolated to the end–member Ca0.5AlSi2O6. Following Khanukhova et al. [269], Gasparik and Lindsley [2] started to use for this component the name Ca–Eskola pyroxene (CaEs), and reported the synthesis of a pyroxene along the CaTs–CaEs join with up to 40 mol% of CaEs.

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Literature
2.
Gasparik, T., Lindsley, D.H.: Phase equilibria at high pressure of pyroxenes containing monovalent and trivalent ions. In: Prewitt, C.T. (ed.) Reviews in Mineralogy. Pyroxenes, vol. 1, pp. 309–339. Mineral Soc Am, Washington DC (1980)
4.
Gasparik, T.: Experimentally determined stability of clinopyroxene + garnet + corundum in the system CaO–MgO–Al2O3–SiO2. Am. Mineral. 69, 1025–1035 (1984)
5.
Gasparik, T.: Experimental study of subsolidus phase relations and mixing properties of pyroxene in the system CaO–Al2O3–SiO2. Geochim. Cosmochim. Acta 48, 2537–2545 (1984)CrossRef
6.
Gasparik, T., Newton, R.C.: The reversed alumina contents of orthopyroxene in equilibrium with spinel and forsterite in the system MgO–Al2O3–SiO2. Contrib Miner Petrol 85, 186–196 (1984)CrossRef
10.
Gasparik, T.: Experimental study of subsolidus phase relations and mixing properties of pyroxene and plagioclase in the system Na2O–CaO–Al2O3–SiO2. Contrib. Miner. Petrol. 89, 346–357 (1985)CrossRef
11.
Gasparik, T.: Experimental study of subsolidus phase relations and mixing properties of clinopyroxene in the silica saturated system CaO–MgO–Al2O3–SiO2. Am. Mineral. 71, 686–693 (1986)
113.
Boyd, F.R., England, J.L.: Melting of silicates at high pressures. Carnegie. Inst. Wash. Yearb. 60, 113–125 (1961)
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Cressey, G., Schmid, R., Wood, B.J.: Thermodynamic properties of almandine-grossular garnet solid solutions. Contrib. Miner. Pet. 67, 397–404 (1978)CrossRef
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Eskola, P.: On the eclogites of Norway. Vidensk-selskapets Skr, Kristiania, I Mat-Naturv Kl. 8, 1–118 (1921)
184.
Goldsmith, J.R.: The melting and breakdown reactions of anorthite at high pressures and temperatures. Am. Mineral. 65, 272–284 (1980)
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Hays, J.F.: Lime-alumina-silica. Carnegie. Inst. Wash. Yearb. 65, 234–239 (1966)
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Huckenholz, H.G., Kunzmann, T.: Ca-Tschermaks pyroxene and the solubility of aluminum in diopside. Terra Abstracts, Suppl 1, vol 6, p. 25. Blackwell, London (1994)
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Khanukhova, L.T., Zharikov, V.A., Ishbulatov, R.A., Litvin, Y.A.: Excess silica in solid solutions of high-pressure clinopyroxenes as shown by experimental study of the system CaMgSi2O6-CaAl2SiO6-SiO2 at 35 kilobars and 1200°C. Dokl. Acad. Sci. USSR. 229, 170–172 (1976)
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Koziol, A.M., Newton, R.C.: Redetermination of the anorthite breakdown reaction and improvement of the plagioclase-garnet-Al2SiO5-quartz geobarometer. Am. Mineral. 73, 216–223 (1988)
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Mao, H.K.: The system jadeite (NaAlSi2O6) – anorthite (CaAl2Si2O8) at high pressures. Carnegie. Inst. Wash. Yearb. 69, 163–168 (1971)
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McCormick, T.C.: Crystal-chemical aspects of nonstoichiometric pyroxenes. Am. Mineral. 71, 1434–1440 (1986)
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396.
Schmid, R., Cressey, G., Wood, B.J.: Experimental determination of univariant equilibria using divariant solid-solution assemblages. Am. Mineral. 63, 511–515 (1978)
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Smyth, J.R.: Cation vacancies and the crystal chemistry of breakdown reactions in kimberlitic omphacites. Am. Mineral. 65, 1185–1191 (1980)
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Metadata
Title
System CaO–MgO–Al2O3–SiO2 Saturated with Silica
Author
Professor Tibor Gasparik
Copyright Year
2014
Publisher
Springer New York
Book
Phase Diagrams for Geoscientists

Print ISBN: 978-1-4614-5775-6

Electronic ISBN: 978-1-4614-5776-3

Copyright Year: 2014

DOI
https://doi.org/10.1007/978-1-4614-5776-3_6