Tectonics and the Formation of Magmas

1. Introduction.- 2. What Prevents Direct Comparison of Petrologic and Tectonic Data?.- 3. The Possibility of Understanding the Tectonics of Deep-Seated Regions and a Method Proposed for Studying It.- 4. Regional Tectonic Subdivisions According to Depth.- Types of Seismic Regions.- Comparison of Seismic Regions with Tectonic Zones.- Concerning Isostatic Anomalies.- 5. Orientation of Stresses and the Geometry of Deep-Focus Earthquakes.- 6. Primary Magmas.- Lavas of Ethiopia, Syria, and Lake Kivu.- The Tertiary Brito-Arctic Province.- The Relations among Olivine-Basalt, Andesite-Basalt, and Granite Magmas.- 7. The Tectonic Distribution of Primary Magmas.- 8. The Extrageosynclinal Type of Magmatic Development.- Basaltic Magmas.- Silicic Magmas.- Alkalic and Ultrabasic Complexes.- 9. Magmatic Features of Midocean Ridges.- 10. Geosynclinal Magmas.- Geosynclines and Deep-Focus Earthquakes.- Magma from the Mantle.- Ultrabasic Rocks.- The Tectonofer.- 11. Silicic Magmas (Magma Formation in the Crust).- 12. Volcanic (Volcanic-Plutonic) Belts.- 13. Magma and the Subsidence of Ocean Basins (Concerning "Oceanization").- 14. Conditions for the Appearance of Magma.- Basaltic Magmas.- Alkalic Basalts.- Ultrabasic Complexes.- 15. Conclusions.- Concluding Remarks for English-Language Readers.- Appendix. Tables of Chemical Analyses.- Literature Cited.