2nd Long Exam

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Created by
marielle anacan

Cards (13)

  • it is the change undergone by pre-existing rocks
    metamorphism
  • other word for pre-existing rock
    protolith
  • 3 agents if metmaorphism
    heat
    pressure
    chemically-active fluids
  • what are types of metamorphism
    contact metamorphism
    regional metamorphism
    hydrothermal metamorphism
    shock (impact) metamorphism
  • what is the zone of alteration in contact metamorphism
    aureole
  • some rocks formed by regional metamorphism may not exhibit foliated texture like quartzite (almost pure quartz met rock) and marble (limestone protolith)
  • High-temperatures and moderate pressure catalyzed by hot, ion-rich (hydrothermal) fluids
    hydrothermal metamorphism
  • SiO2 polymorphs:
    stishovite and coesite
  • exhibits a pervasive planar structur
    foliated
  • types if foliation
    SLATY CLEAVAGE PHYLLITIC TEXTURE SCHISTOSITY GNEISSIC TEXTURE
  • large crystals in fine groundmass
    porphyroblast
  • folds in non foliation
    crenulations
  • high pressure, low temperature (trenches)
    low pressure, high temperature (volcanic arc)
    high pressure, high temperature (subduction zones)