GEOG 001 Lecture Notes - Lecture 18: Osorno, Chile, Nonlinear System, Mount Garibaldi
19 Aug 2020
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Document Summary
Magmas come from the mantle and have not mixed with silica- and gas-rich magmas derived from continental crust. Volcanic mountain having a broad profile is built up over time by flow after flow of basaltic lava issuing from vents or fissures on the surface of the volcano (long periodof time) Shape: gentle arch or dome with gentle slopes, broad summits. Size: largest volcanoes on earth, tallest. (bases commonly on the ocean floor) location: hawaiian islands, iceland, and some islands in the indian. Plate contact: forms at zones where two oceanic plates diverge and magma moves upward through the gap. Eruption and hazard: lava flows, some explosive activity. Examples in canada: ilgachuz range in bc: composite volcanoes/stratovolcanoes. Interlayer lavas and pyroclastic deposits that characterize these conical volcanoes. They erupt less frequently than active shield volcanoes, but the eruptions involve andesitic/deictic magmas and are explosive. These volcanoes have been responsible for the most of the deaths and destruction throughout history; mount.
