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Crustal anatexis: An experimental review

Wyllie, Peter J. (1977) Crustal anatexis: An experimental review. Tectonophysics, 43 (1-2). pp. 41-71. ISSN 0040-1951. doi:10.1016/0040-1951(77)90005-1.

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Review of experimental studies in synthetic systems An—Ab—Or—Qz—H_2O and K_2O—Aℓ_2O_3—SiO_2—H_2O illustrates the dominance of feldspar—quartz assemblages in crustal anatectic processes, and the role of hydrous minerals such as muscovite. H_2O-undersaturated liquids can exist with quartz—feldspar assemblages through hundreds of degrees with little change in composition in terms of anhydrous components. Review of the phase relationships in the rock series gabbro—tonalite—granodiorite—granite—H_2O to 15 kbar is used as a basis for interpreting anatexis of deep crustal rocks, including metamorphosed grey wackes and pelitic rocks. For individual rocks, diagrams include PT projections with excess H_2O, with hydrous minerals but no excess H_2O, of H_2O-undersaturated liquidus surfaces, and isobaric T-X_(H_2O) sections. For the rock series, 10 kbar diagrams show the melting interval with excess H_2O, the H_2O-undersaturated liquidus surface, and the melting interval with 2% H_2O. The normal product of regional metamorphism is H_2O-undersaturated granitic liquid; H_2O-saturated liquids exist only through narrow temperature intervals. Liquids of granite composition trend towards granodiorite with increasing temperature or pressure, but compositions do not reach tonalite unless metamorphic temperatures approach 1100°C. Tonalite plutons represent mushes of granitic liquid with refractory residual crystals, or recrystallized residual masses from which the granitic liquid escaped. Some tonalite plutons may be derived from magmas with source in subducted ocean crust or mantle.

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Additional Information:© 1977 Elsevier Scientific Publishing Company. Received September 1, 1976. This research was supported by the Earth Sciences Section, National Science Foundation, NSF Grant DES 73-00191 A01. We would like to acknowledge also the general support of the Materials Research Laboratory by the National Science Foundation. For rock samples, chemical analyses, and modal data, I thank P.C. Bateman, F.C. Dodge, J.J. Norton, and R.T. McLaughlin.
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NSFDES 73-00191 A01
Issue or Number:1-2
Record Number:CaltechAUTHORS:20160202-102524697
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Official Citation:Peter J. Wyllie, Crustal anatexis: An experimental review, Tectonophysics, Volume 43, Issues 1–2, 15 November 1977, Pages 41-71, ISSN 0040-1951, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64163
Deposited By: Tony Diaz
Deposited On:03 Feb 2016 23:33
Last Modified:10 Nov 2021 23:26

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