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Erschienen in:
Thermodynamic Model and Techniques Kapitel lesen Erstes Kapitel lesen

2014 | OriginalPaper | Buchkapitel

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

verfasst von : Professor Tibor Gasparik

Erschienen in: Phase Diagrams for Geoscientists

Verlag: 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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Vorheriges Kapitel System CaO–MgO–Al2O3–SiO2 Undersaturated with Silica
Nächstes Kapitel Systems with Na and Ca at Lithospheric Pressures
Literatur
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)
149.
Cressey, G., Schmid, R., Wood, B.J.: Thermodynamic properties of almandine-grossular garnet solid solutions. Contrib. Miner. Pet. 67, 397–404 (1978)CrossRef
164.
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)
198.
Hariya, Y., Kennedy, G.C.: Equilibrium study of anorthite under high pressure and high temperature. Am. J. Sci. 266, 193–203 (1968)CrossRef
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Hays, J.F.: Lime-alumina-silica. Carnegie. Inst. Wash. Yearb. 65, 234–239 (1966)
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Hensen, B.J., Schmid, R., Wood, B.J.: Activity-composition relationships for pyrope-grossular garnet. Contrib. Miner. Pet. 51, 161–166 (1975)CrossRef
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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)
268.
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)
275.
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)
312.
Mao, H.K.: The system jadeite (NaAlSi2O6) – anorthite (CaAl2Si2O8) at high pressures. Carnegie. Inst. Wash. Yearb. 69, 163–168 (1971)
316.
McCormick, T.C.: Crystal-chemical aspects of nonstoichiometric pyroxenes. Am. Mineral. 71, 1434–1440 (1986)
353.
Perkins III, D.: The stability of Mg-rich garnet in the system CaO-MgO–Al2O3–SiO2 at 1000–1300°C and high pressure. Am. Mineral. 68, 355–364 (1983)
396.
Schmid, R., Cressey, G., Wood, B.J.: Experimental determination of univariant equilibria using divariant solid-solution assemblages. Am. Mineral. 63, 511–515 (1978)
415.
Smyth, J.R.: Cation vacancies and the crystal chemistry of breakdown reactions in kimberlitic omphacites. Am. Mineral. 65, 1185–1191 (1980)
457.
Wood, B.J.: Reactions involving anorthite and CaAl2SiO6 pyroxene at high pressures and temperatures. Am. J. Sci. 278, 930–942 (1978)CrossRef
458.
Wood, B.J.: Activity-composition relationships in Ca(Mg, Fe)Si2O6–CaAl2SiO6 clinopyroxene solid solutions. Am. J. Sci. 279, 854–875 (1979)CrossRef
459.
Wood, B.J., Henderson, C.M.B.: Compositions and unit-cell parameters of synthetic non-stoichiometric tschermakitic clinopyroxenes. Am. Mineral. 63, 66–72 (1978)
Metadaten
Titel
System CaO–MgO–Al2O3–SiO2 Saturated with Silica
verfasst von
Professor Tibor Gasparik
Copyright-Jahr
2014
Verlag
Springer New York
Buch
Phase Diagrams for Geoscientists

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

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

Copyright-Jahr: 2014

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