Read e-book online Basalts and Phase Diagrams: An Introduction to the PDF

By Stearns Morse

ISBN-10: 0387904778

ISBN-13: 9780387904771

A publication on section diagrams in igneous petrology, with the early components of the chapters being effortless and the later elements being complicated. subject matters variety from simple platforms resembling Anorthite-Albite to extra complicated fabric akin to an creation to Schreinemakers' ideas.

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Additional resources for Basalts and Phase Diagrams: An Introduction to the Quantitative Use of Phase Diagrams in Igneous Petrology

Sample text

Solutions: Solid and Liquid 29 being usually positive. It is then the normal expectation for silicate minerals to have positive melting curves, which they do in all known cases, in the absence of volatile components, at low to intermediate pressures. The introduction of water to anhydrous silicate systems produces negative melting curves, because water dissolves in the melt to a greater extent than in the crystal, stabilizing the melt at a lower temperature as more pressure is applied to the vapor phase, by LeChatelier's principle.

There is a unique point, the eutectic, in the diagram of Fig. 1 at which the two liquidus curves intersect at the solidus. Since the liquidus curves specify equilibrium between Di + L on the one hand and An + L on the other hand, the eutectic apparently involves an equilibrium among all three, Di + An + L. Here and only here, cf> = 3, and Wp = 3 - 3 = 0; the eutectic is an invariant point. Notice again the correspondence between variance and dimensions, both being zero in this case. 8 Saying that the variance is zero is a most informative statement, since nothing further need be said to learn from the phase diagram that the temperature is 1274°C, and that the liquid has the composition Di5sAn42 and coexists with pure Di crystals and pure An crystals.

For example, given the identity of the phases as An + L, one need only specify the temperature as 1328°C to be informed from the phase diagram that a liquid of composition Di5lAnso coexists with crystals of pure An. ) Alternatively one could specify the composition of the liquid in equilibrium with crystals of pure An as DisoAn50' and learn from the diagram that the temperature for such a situation is 1328°C. There is a unique point, the eutectic, in the diagram of Fig. 1 at which the two liquidus curves intersect at the solidus.

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Basalts and Phase Diagrams: An Introduction to the Quantitative Use of Phase Diagrams in Igneous Petrology by Stearns Morse


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