Abstract
The matter found on the Earth’s surface can be divided into two categories: (1) that formed under the conditions of temperature and pressure prevailing at the surface, and (2) that formed at much higher pressure and temperature. Among the latter, two chief types may be distinguished:
The first is the magmatic rocks (also called igneous) that took shape from a liquid of melted silicates. The crystallization of these magmas could occur rapidly at the surface creating volcanic rocks or slowly at greater depths producing plutonic rocks.
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© 1974 D. Reidel Publishing Company, Dordrecht, Holland
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Allègre, CJ., Michard, G. (1974). The Equilibria of Phases in the Lithosphere. In: Introduction to Geochemistry. Geophysics and Astrophysics Monographs, vol 10. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2261-3_2
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DOI: https://doi.org/10.1007/978-94-010-2261-3_2
Publisher Name: Springer, Dordrecht
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