Mathematics – Logic
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.7047a&link_type=abstract
Journal of Geophysical Research, vol. 87, Aug. 10, 1982, p. 7047-7060. Research supported by the University of Chicago
Mathematics
Logic
26
Basalt, Continents, Planetary Evolution, Subduction (Geology), Volcanoes, Chemical Composition, Earth Crust, Magma
Scientific paper
Geological, textural, and compositional data for eight widely separated volcanic regions from various subduction zones are presented. It is noted that basaltic liquid is parental to new crust in subduction zones, occurring as inclusions of glass in crystals of olivine in andesites and dacites as well as basalts. Volcanoes that have never erupted a basaltic rock nevertheless have basaltic glasses included in extruded crystals. The basaltic liquids are rich in Al2O3 and Cl and have higher values of Cl/K2O than associated andesitic liquids. Since a decrease in Cl/K2O with an increase in K2O and SiO2 implies vapor saturation, most andesitic liquids develop in vapor-saturated environments. Estimated concentrations of H2O and CO2 in the liquids are seen as indicating that vapor saturation is probably restricted to the crust. It is concluded that basalt is the principal parental magma generated in the mantle of subduction zones.
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