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Interactions among magmas and rocks in subduction zone regions: experimental studies from slab to mantle to crust

Wyllie, Peter J. and Carroll, Michael R. and Johnston, A. Dana and Rutter, Michael J. and Sekine, Toshimori and van der Laan, Sieger R. (1989) Interactions among magmas and rocks in subduction zone regions: experimental studies from slab to mantle to crust. European Journal of Mineralogy, 1 (2). pp. 165-180. ISSN 0935-1221. doi:10.1127/ejm/1/2/0165.

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Experiments have been conducted to study contamination of magmas in four environments : (1) above subducted slabs, (2) below and (3) above the mantle-continental crust boundary, and (4) within shallow crust. Reaction couples of peridotite or amphibolite with a sharp boundary against hydrous silicic melts define (1) diffusion profiles within contaminated melts and (2) crystalline reaction zones between the two materials. Mixtures of rocks peridotite-tonalite-granodiorite-granite with water define phase boundaries delineating the extent of contamination of slab-derived melts rising through mantle and of crustal melts in contact with peridotites {e.g., cumulates). Chemical diffusion in granite melts at 1.5 kbar, 810 °C is slow ; diffusion between hot, hydrous basalt-rhyolite at 10 kbar is faster. Convection occurs in H20-undersaturated granite melt at 10-15 kbar, 920-1050 °C, during passage of a melting front through crystalline granite adjacent serpentinized peridotite, the source of H_2O; the convective motions transport contaminated melt away from the diffusion zone, which therefore remains narrow. Rates of contamination and mixing of magmas near the mantle-crust boundary are likely to be much faster than in shallow crustal plutons. Slab-derived melts are richer in Ca/Mg than calc-alkaline rocks, and contamination with overlying mantle at depth makes them richer in Mg/Ca than calc-alkaline rocks. Near the mantle crust boundary, Ca/Mg in contamined melts is appropriate for calc-alkaline rocks.

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Additional Information:© 1989 E. Schweizerbart'sche Veriagsbuchhandlung. Received 9 April 1988; Accepted 14 November 1988. This research was supported by the Earth Sciences section of the U.S. National Science Foundation, grant EAR85-06857. We thank M. B. Baker for critical review of a draft of the manuscript. Caltech Division of Geological and Planetary Sciences Contribution 4688.
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Subject Keywords:experimental petrology; magma-rock interaction; subduction
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Caltech Division of Geological and Planetary Sciences4688
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ID Code:63652
Deposited By: Tony Diaz
Deposited On:13 Jan 2016 22:21
Last Modified:10 Nov 2021 23:19

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