Difference between revisions of "Oceanic volcanoes"
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| − | In a typical "oceanic" [[environment]], [[volcano|volcanoes]] are | + | In a typical "oceanic" [[environment]], [[volcano|volcanoes]] are aligned along the [[crest]] of a broad [[ridge]] that marks an active [[fracture]] system in the oceanic [[crust]]. [[Basalt|Basaltic]] [[magma]]s, generated in the upper [[mantle]] beneath the ridge, rise along fractures through the basaltic layer. Because the [[granite|granitic]] crustal layer is absent, the magmas are not appreciably modified or changed in [[composition]] and they [[erupt]] on the surface to form basaltic volcanoes. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology (Tilling, 1985)]</ref> |
==References== | ==References== | ||
Revision as of 22:50, August 13, 2007
In a typical "oceanic" environment, volcanoes are aligned along the crest of a broad ridge that marks an active fracture system in the oceanic crust. Basaltic magmas, generated in the upper mantle beneath the ridge, rise along fractures through the basaltic layer. Because the granitic crustal layer is absent, the magmas are not appreciably modified or changed in composition and they erupt on the surface to form basaltic volcanoes. [1]
