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Clerical:
It's Volcano Video Week!!!
Quizzes 9-12 are posted.
Homeworks #7 (not graded) and #8 (graded) are posted. Homework #8 will be
completed and turned at the end of class Friday (3/18/11).
Exam #3 will be given in class on Wednesday (3/30/11). The Exam #3 Study Guide is posted.
Learn "The Big Chart". Love "The Big Chart".
Themes of the Day:
- Mafic Magmas
- Basaltic Lavas
- Hawaiian Volcanoes
Mafic Magmas
- formed by melting of the mantle
- by depressurization melting (upwelling of the mantle) at divergent plate boundaries and hotspots
- by addition of fluids at subduction zones
- Mafic magmas undergo reltively little magmatic evolution in the thin oceanic crust, thus they crystallize to
form basalt or gabbro
- At subduction zones, mafic magmas generally rise through thicker, more felsic crust, therefore tend to
evolve into intermediate to felsic composition magmas before crystallizing
Basaltic Lavas
Hawaiian Volcanoes
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