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Sources of granitoid magmas at convergent plate boundaries

Wyllie, Peter J. (1984) Sources of granitoid magmas at convergent plate boundaries. Physics of the Earth and Planetary Interiors, 35 (1-3). pp. 12-18. ISSN 0031-9201. doi:10.1016/0031-9201(84)90030-X.

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Source rocks for magmas in subduction zones include subducted oceanic crust, mantle peridotite, and metamorphic rocks of continental crust. Phase relationships for these materials, including the compositions of liquids developed at various pressures, temperatures, and with H_2O and CO_2, provide a starting point for the petrogenesis of granitoid intrusions. Four thermal structures are obtained by combinations of warm or cool subducted oceanic crust, and cool or warm overlying mantle. These encompass the range of dehydration and melting sites and processes likely to occur in subduction. Petrological structures derived by combining major rock structures with the assumed thermal structures and the phase relationships of materials indicate that initial magma generation in any of the three major source rocks may be followed by a sequence of events leading to the intrusion of granitoid magmas into continental crust. Magmas of different compositions may rise independently from different sources at different depths, introducing the prospect of hybridization and magma mixing in the mantle and continental crust. Many granitoid intrusions are initiated by the transfer of heat and magma from below the continental crust.

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Additional Information:© 1984 Elsevier B.V. This research was supported by the Earth Sciences Section of the National Science Foundation, NSF Grants EAR 8108626 and EAR 8206178.
Funding AgencyGrant Number
NSFEAR 8108626
NSFEAR 8206178
Issue or Number:1-3
Record Number:CaltechAUTHORS:20160114-075732039
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Official Citation:Peter J. Wyllie, Sources of granitoid magmas at convergent plate boundaries, Physics of the Earth and Planetary Interiors, Volume 35, Issue 1, 1984, Pages 12-18, ISSN 0031-9201, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63669
Deposited By: Tony Diaz
Deposited On:14 Jan 2016 19:44
Last Modified:10 Nov 2021 23:19

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