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Abstract
4-2 Keith, S. B., 1978, Paleosubduction geometries inferred from Cretaceous and Tertiary magmatic patterns in southwestern North America: Geology (Boulder), v. 6, no. 9, p. 516-521.182
Abstract
4-2 Keith, S. B., 1978, Paleosubduction geometries inferred from Cretaceous and Tertiary magmatic patterns in southwestern North America: Geology (Boulder), v. 6, no. 9, p. 516-521.182
ABS
Spatial, temporal, and chemical patterns of igneous rocks in southern California, southern Arizona, and southwestern New Mexico strongly support low-angle subduction beneath southwestern North America in Late Cretaceous through middle Tertiary time. The data suggest constant dip-variable depth subduction from 130 to 80 m.y. B.P. and variable dipvariable depth subduction from 80 to 20 m.y. B.P. Flattening of the subducting slab from 80 to 50 m.y. B.P. and steepening of the slab from 40 to 20 m.y. B.P. are indicated by the data.
Key words
alkalic composition. Arizona. Benioff zone. calc-alkalic composition. California. Cenozoic. Cretaceous. data. depth. dip. distribution. geochemistry. geometry. igneous activity. igneous rocks. Laramide Orogeny. low-angle subduction. Mesozoic. mineral composition. New Mexico. North America. orogeny. patterns. plate tectonics. regional patterns. review. Southern California. Southwestern U.S.. subduction. tectonics. tectonophysics. Tertiary. United States. Upper Cretaceous.
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Abstract
4-2 Keith, S. B., 1978, Paleosubduction geometries inferred from Cretaceous and Tertiary magmatic patterns in southwestern North America: Geology (Boulder), v. 6, no. 9, p. 516-521.182
ABS
Spatial, temporal, and chemical patterns of igneous rocks in southern California, southern Arizona, and southwestern New Mexico strongly support low-angle subduction beneath southwestern North America in Late Cretaceous through middle Tertiary time. The data suggest constant dip-variable depth subduction from 130 to 80 m.y. B.P. and variable dipvariable depth subduction from 80 to 20 m.y. B.P. Flattening of the subducting slab from 80 to 50 m.y. B.P. and steepening of the slab from 40 to 20 m.y. B.P. are indicated by the data.
Key words
alkalic composition. Arizona. Benioff zone. calc-alkalic composition. California. Cenozoic. Cretaceous. data. depth. dip. distribution. geochemistry. geometry. igneous activity. igneous rocks. Laramide Orogeny. low-angle subduction. Mesozoic. mineral composition. New Mexico. North America. orogeny. patterns. plate tectonics. regional patterns. review. Southern California. Southwestern U.S.. subduction. tectonics. tectonophysics. Tertiary. United States. Upper Cretaceous.
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