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Unformatted text preview: 6. Interpalte volcanoes a. Very large Volcanoes b. Basaltic composition c. This layered shields d. Effusive, long duration e. Rarely explosive f. Extensive flows 7. Nature of interpolate volcanoes: structure of hotspot volcanoes a. Elongated b. Rift zones define elongation c. Summit magma reservoirs connect to rift zones d. Cyclic eruptions (quakes, tilting) e. Summit or rift zone eruptions 8. Large igneous Provinces (flood basalts) a. Columbia river basalt i. Erupted between 17 and 6 million years ago ii. Up to 6000ft thick iii. Flowed as much as 600 km from vent iv. Total erupted volume ~175,000 km 3 v. St Helens ~km 3 and ongoing vi. Kilaeua eruption ~2 km 3 and ongoing b. Many LIPs are over 10 times bigger than the Columbia river basalt c. How are flood basalts emplaced? i. Early models: catastrophic floods of lava ii. Most recent ideas: inflation of basalt sheets 1. Effusion rate, topography, slope all contribute to the final morphology of the flow field 2....
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This note was uploaded on 07/02/2009 for the course ESS 106 taught by Professor Bergantz during the Spring '09 term at University of Washington.
- Spring '09