Geology Of the Mantle Flashcards
Ultramafic Xenoliths
chunks of solid mantle carried upward as inclusions in lava
Chemical reactions and quantum mechanics
Ultramafic Xenoliths
Ophiolite
a chunk of seafloor that has been pushed up on land, we can detrmine the composition of the mantle by averaging it’s layers
a chunk of seafloor that has been pushed up on land, we can detrmine the composition of the mantle by averaging it’s layers
Ophiolite
layers of an ophiolite (bottom to top)
Hartzburgite, dunite, gabbro, sheet dikes, pillow bassalts
Hartzburgite, dunite, gabbro, sheet dikes, pillow bassalts
layers of an ophiolite (bottom to top)
Lherzolite
the forbidden rock we know exists, but can’t see, that makes up the upper mantle. Composed of Olovine, Orthopyroxine, and clinopyroxine
the forbidden rock we know exists, but can’t see, that makes up the upper mantle. Composed of Olovine, Orthopyroxine, and clinopyroxine
Lherzolite
Aluminum in the mantle
can’t be incorporated int Lherzolite, so insted it forms either plagioclase, spinel, or garnet depending on the conditions
can’t be incorporated int Lherzolite, so insted it forms either plagioclase, spinel, or garnet depending on the conditions
Aluminum in the mantle
Olivine collor in hand
olive green to greenish grey
olive green to greenish grey
Olivine collor in hand
olivine cleavage
poor cleavage, in both hand sample and thin section, thin section shows fracturing
poor cleavage, in both hand sample and thin section, thin section shows fracturing
olivine cleavage
Olivine habbit
either massive or drusty
either massive or drusty
Olivine habbit
olivine XPL
second order collors like a stained glass window
second order collors like a stained glass window
olivine XPL
clinopyroxene in thin section
bright 2nd order olors in XPL, has obvious cleavage