CIVE153 Final: CIVE153- Term Test 2
25 Apr 2016
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Document Summary
Tabular: thin in one-dimension relative to the other dimensions; dike, sill. Massive: very large and generally no distinct shape; batholith, laccolith. Concordant: parallel to the host (country rock) Discordant: cut across the layering of the host rock. Columnar joints: when sills (intrusive) and lava flows (extrusive) cool, they develop shrinkage features that produce elongate pillar-like columns. Batholiths occur in groups that form extensive belts several hundreds of kilometers long and up to 100 kilometers wide. Batholiths may compose the core of mountain systems. Crystallization of magma drops in a silicate magma, and the solid crystals can react with the liquid phase of the magma to from new minerals. : magmatic differentiation minerals crystalize sequentially as the temperature. Low permeability loess soil (silt) used in the core was found to be cracked due to differential strains imposed by water seepage forces. Fissures in the rhyolite (beneath the grout cap) allow excess water to flow beneath the dam developing an erosion tunnel.
