Abstract
The bulk chemistry of the earth’s upper mantle, as deduced from analysis of exotic fragments from explosive igneous pipes and from geochemical arguments, can be “modeled” to quite a good approximation by the simple system CaO-MgO-A1203-SiO2. The only significant departures from this quaternary system in Green and Ringwood’s (1967) “pyrolite III”, which is their favored mantle composition, are 8.0 percent FeO and 0.4 percent Cr 203. FeO plays a role in the ferromagnesian minerals very similar to that of MgO, which dominates it by a factor of ten in molar amount, hence its influence should be minor. Cr 203 is closely similar to A1203 in its behavior and again greatly inferior in amount. The quaternary system yields all of the major phases which coexist in peridotites, namely olivine, orthopyroxene, clinopyroxene, spinel, garnet and plagioclase. For these reasons the simple system has been very useful in geophysical phase-equilibrium investigations.
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References
Akella, J. Extended Abstr., Int. Conf. on Geotherm. and Geobarom., Penn. St. Univ., Oct. 5–10, 1975.
Boyd, F.R. Mineral. Soc. Amer. Spec. Pap., 3, 63 (1970).
Charlu, T.V., Newton, R.C. and Kleppa, O.J. Geochim. Cosmochim. Acta, 39, 1487 (1975).
Clark, S.P., Schairer, F.J. and de Neufville, J. Carnegie Inst, of Wash. Yrbk., 61, 59 (1962).
Davis, B.T.C. and Boyd, F.R. J. Geophys. Res., 71, 3507 (1966).
Dickey, J.M. Mineral. Soc. Amer. Spec. Pap., 3, 33 (1970).
Ganguly, J. Contr. Mineral. Petrol., 55, 81 (1976).
Ganguly, J. and Kennedy, G.C. Contr. Mineral. Petrol., 48 137 (1974).
Green, D.H. and Ringwood, A.E. Earth Plan. Sci. Lett., 3, 151 (1967).
Guggenheim, E. “Mixtures”, Oxford University Press, 270 pp. (1952).
Hariya, Y. and Kennedy, G.C. Amer. J. Sci., 266, 193 (1968).
Hensen, B.J., Schmid, R. and Wood, B.J. Contr. Mineral. Petrol., 51, 161 (1975).
Herzberg, C.T. and Chapman, N.A. Int. Conf. on Geotherm. and Geobarom., Penn. St. Univ., Oct. 5–10, 1975.
Kushiro, I. and Yoder, H.S. J. Petrol., 7, 337 (1966).
MacGregor, I.D. Carnegie Inst, of Wash. Yrbk., 64, 126 (1965).
MacGregor, I.D.. Phys. Earth Plan. Int., 3, 372 (1970).
Mori, T. and Green, D.H. Earth Plan. Sci. Lett., 26, 277 (1975).
Mysen, B.O. and Heier, K.S. Contr. Mineral. Petrol., 36, 73 (1972).
Newton, R.C., Charlu, T.V. and Kleppa, O.J. Geochim. Cosmochim. Acta, 1976 (in press).
Obata, M. Int. Conf. on Geotherm. and Geobarom., Penn. St. Univ., Oct. 5–10, 1975
O’Hara, M.J., Richardson, S.W. and Wilson, G. Contr. Mineral. Petrol., 32, 48 (1971).
O’Hara. M.J. and Mercy, E.L.P. Trans. Roy. Soc. Edin., 65, 251 (1963)
Okamura, F.P., Ghose, S. and Ohashi, H. Amer. Mineral., 59, 549 (1974).
Råheim, A. and Green, D.H. Contr. Mineral. Petrol., 48, 179 (1974).
Robie, R.A. and Waldbaum, D.R. U.S. Geol. Surv. Bull., 1259, 256 pp (1968).
Skinner, B.J. in S.P. Clark (Ed.), “Handbook of Physical Constants”, Geol. Soc. Amer. Mem., 97., 75 (1966).
Skinner, B.J. and Boyd, F.R. Carnegie Inst, of Wash. Yrbk., 63, 163 (1964).
Thompson, J.B. in Ph. H. Abelson, (Ed.), “Researches in Geochemistry”, vol.II, Wiley, 340 (1967).
Warner, R.D. and Luth, W.C. Amer. Mineral., 59, 98 (1974).
Wood, B.J. Int. Conf. on Geotherm. and Geobarom., Penn. St. Univ., Oct. 5–10, 1975
References
Hariya, Y. and Kennedy, G.C. Amer. J. Sci., 266, 193 (1968).
Okamura, F.P., Ghose, S. and Ohashi, H. Amer. Mineral., 59, 549 (1974).
Wood, B.J. Extended Abstr., Int. Conf. on Geotherm., Geobarom., Penn. St. Univ., Oct. 5–10, 1975
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© 1977 D. Reidel Publishing Company, Dordrecht-Holland
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Newton, R.C. (1977). Thermochemistry of Garnets and Aluminous Pyroxenes in the CMAS System. In: Fraser, D.G. (eds) Thermodynamics in Geology. NATO Advanced Study Institutes Series, vol 30. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-1252-2_3
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DOI: https://doi.org/10.1007/978-94-010-1252-2_3
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