Minerology of Melting Flashcards
Flux melting process
as the crust subducts it is metamorphosised and the water molecules move into the asthenosphere, causing melting
as the crust subducts it is metamorphosised and the water molecules move into the asthenosphere, causing melting
Flux melting process
MASH zone
melted asthenosphere pooling at the bottom of the crust, melts the crust and creates a mixture, more mafic minerals precipitate out
melted asthenosphere pooling at the bottom of the crust, melts the crust and creates a mixture, more mafic minerals precipitate out
MASH zone
crust as a filter
as the magma blob rises through the crust, mafic minerals precipitate out, and more felsic minerals are melted in over multiple MASH zone type events. the thicker the crust the more felsic.
lower crust/mantal minerals
Olivine, pyroxenes, and garnet
mid crust minerals
amphiboles (actinilite/hornblende) biotite
upper crust minerals
k-feldspars (Orthocase,microcline, sanidine ) Plagioclase (albite, labradorite, anorthite) Quartz.
controlls the angle of subduction, and therefore where the volcanoes happen
age of subducting plate and speed of plate motion.
age of subducting plate and speed of plate motion.
controlls the angle of subduction, and therefore where the volcanoes happen
M.A.S.H. Zone acronym
Melting, Assimilation, Storage, & Homogenization
Melting, Assimilation, Storage, & Homogenization
Melting, Assimilation, Storage, & Homogenization
Asimilation Fraction Crystalization
AFC, the process by which more mafic minerals crystalize out as more felsic minerals are melted when the magma rises through the crust
AFC, the process by which more mafic minerals crystalize out as more felsic minerals are melted when the magma rises through the crust
Asimilation Fraction Crystalization
Calk-Alkaline chemical trend
as the magma rises through the crust AFC causes magnesium, then iron, to drop out, leaving potassium rich minerals
