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Hydrothermal Melting of Shales

Wyllie, P. J. and Tuttle, O. F. (1961) Hydrothermal Melting of Shales. Geological Magazine, 98 (01). pp. 56-66. ISSN 0016-7568. doi:10.1017/S0016756800000078.

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PT curves for the beginning of melting of five analysed shales in the presence of water vapour under pressure are 20° C. to 40° C. higher than the corresponding curve for granite. About 150° C. above the beginning of melting, the shales are half-melted; this is higher than the liquidus curve of most granites. Refractive indices of the quenched liquids (1·495–1·505) indicate a granitic or granodioritic composition. Quartz, cordierite, mullite, hypersthene, anorthite, etc., are developed in the partially fused shales. Partial fusion of shales by a granitic magma, even if superheated, would produce a liquid no more basic than granodiorite. The chemical characteristics of the shales are compared with average igneous rocks, and there appears to be no possibility that fusion of shales could produce a basaltic magma. Complete fusion would produce a melt with composition distinct from normal igneous magmas.

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Additional Information:© 1966 Cambridge University Press. Mineral Industries Experiment Station Contribution No. 59-99. This work was supported by the National Science Foundation. We are grateful to Dr. M. L. Keith for providing us with large samples of the carefully analysed shales.
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Issue or Number:01
Record Number:CaltechAUTHORS:20160112-101820809
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Official Citation: P. J. Wyllie and O. F. Tuttle (1961). Hydrothermal Melting of Shales. Geological Magazine, 98, pp 56-66. doi:10.1017/S0016756800000078
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63584
Deposited By: Tony Diaz
Deposited On:12 Jan 2016 20:51
Last Modified:10 Nov 2021 23:18

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