Metamorphic tectonic environments

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Metamorphic tectonic environments
Tectonic setting (and how long meta-morphism takes) Temp (Geothermal gradient) Pres. Fluids likely? Textures Zone name
diagenesis millions of years low low in rocks none (or original) zeolite
subduction 10 - 100 m.y. very low Very high lots Foliated blueschist
granitic intrusion x000 - xx000 yrs Relatively cool (still hot!) Low high Non foliated (hornfels) hornfels
gabbroic intrusion x000 - xx000 yrs Hot Low Low compare to granite Non foliated hornfels
big mtn belts (Himalaya) 10 - 100 m.y. Hot High Low (none) Foliated (very) Eclogite/ggranulite
the middle of the USA, down 10 km 10 - 100 m.y. Moderately hot moderate Relatively none Minorly foliated greenschist
Do not feel like you should memorize zone names
please