The relationship between geothermal gradient and the composition of granitic magmas in orogenic belts |
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| Authors: | Anthony Hall |
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| Institution: | (1) Department of Geology, King's College, University of London, UK |
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| Abstract: | A comparison has been made between the average compositions of the granites in the Variscan, Caledonian, and Alpine orogenic belts of western Europe. Their respective compositions lie near the isobaric minima in the system Q-Or-Ab-H2O for successively higher water pressures, whereas metamorphic facies series indicate that the three orogenic belts developed under successively lower geothermal gradients. These relationships are consistent with an origin of the granitic magmas by partial melting in the crust. |
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