ENV 4521 Study Guide - Final Guide: Lava Dome, Sunset Crater, Stratovolcano
30 Jun 2019
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Document Summary
Composite volcano magma and eruption style magma intermediate in chemistry, often andesitic, long life span, both explosive eruptions of pyroclastics and quiet eruptions of lava. Lava or plug dome shape and size usually smaller, irregular in shape. Lava or plug dome structure solidified lava that was thick and viscuous when molten; plug of lava often covered by pyroclastics; frequently occur within the crater of composite volcano. Lava or plug dome magma and eruptions style usually high in silica, often rhyolitic; dome grows by expansion of viscuous lava from within; explosive eruptions. Examples of lava dome lassen peak, california; mono craters, california. Cinder cone shape and size small, steep-sided cinder cone structure loose pyroclastic material; may be composed of ash or cinder-sized pieces. Cinder cone magma and eruption style chemistry of magma varies, often basaltic; short life span; pyroclastics ejected from central vent; occasionally produces lava flows.
