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Published in:
Thermodynamic Model and Techniques Read chapter Read first chapter

2014 | OriginalPaper | Chapter

8. System Na2O–MgO–Al2O3–SiO2

Author : Professor Tibor Gasparik

Published in: Phase Diagrams for Geoscientists

Publisher: Springer New York

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Abstract

Phase relations in the NMAS system are directly applicable to the classic problem of the origin of the tholeiitic and alkali basalts. The two magma types are separated at 1 atm by a thermal divide between forsterite and albite [396]. Yoder and Tilley [472] showed that this thermal divide breaks down at high pressures and is replaced by a new thermal divide between enstatite and jadeite, responsible for the change in the composition of the basaltic melts from tholeiitic at lower pressures to alkaline at higher pressures. This reflects the depth of origin, which is shallow for the tholeiitic magmas, typically generated under the mid-ocean ridges, but greater for the alkali basaltic magmas originating under the older and thicker oceanic lithosphere.

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previous chapter Systems with Na and Ca at Lithospheric Pressures
next chapter System Enstatite–Diopside–Jadeite
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Metadata
Title
System Na2O–MgO–Al2O3–SiO2
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_8