Subduction products according to experimental prediction

Research Article| June 01, 1982 Subduction products according to experimental prediction PETER J. WYLLIE PETER J. WYLLIE 1Department of Geophysical Sciences, University of Chicago, 5734 S. Ellis Avenue, Chicago, Illinois 60637 Search for other works by this author on: GSW Google Scholar Author and Article Information PETER J. WYLLIE 1Department of Geophysical Sciences, University of Chicago, 5734 S. Ellis Avenue, Chicago, Illinois 60637 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1982) 93 (6): 468–476. https://doi.org/10.1130/0016-7606(1982)93<468:SPATEP>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation PETER J. WYLLIE; Subduction products according to experimental prediction. GSA Bulletin 1982;; 93 (6): 468–476. doi: https://doi.org/10.1130/0016-7606(1982)93<468:SPATEP>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Knowledge of the thermal structure and processes in subduction zones is so uncertain that our more extensive knowledge of source materials and phase relationships remains insufficient for prediction of magmatic products. The phase relationships do provide important constraints for testing geophysical and petrogenetic models, especially when considered along with geochemical constraints. Physical questions, such as the behavior of partially molten rocks, are intimately related to the compositions of magmas from source to eruption site. Tentative predictions and conclusions include: (1) Andesite is not a primary magma from oceanic crust. (2) It is unlikely that liquids from subducted oceanic crust yield andesites by fractionation, except by melting of amphibolite in an especially warm subducted crust. (3) It is more likely that hydrous siliceous magmas from the crust leak into the overlying mantle. (4) Andesite magmas can be generated in peridotite only under exceptional circumstances. (5) H2O-undersaturated basic magmas from peridotite modified by aqueous fluids or hydrous magma may yield andesite by fractionation. (6) Phlogopite peridotite could escape melting and yield alkalic magmas at deeper levels. (7) Andesite magmas could be produced in continental crust only by extreme heating through underplating of basalts or by mixing of basalt and rhyolite (derived from crust). Most of these conclusions need revision if convection in the asthenosphere wedge raises the temperature of the subducted slab to 1250°C at 100 km as proposed by Marsh (1979a); this demonstrates the dependence of experimental predictions on geophysical models. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.