Rocks Flashcards
igneous rock
comes from cooled magma
intrusive
below ground & cools slowly
extrusive
above ground & cools quickly
mafic classification
high viscosity
dark coloration
felsic classification
low viscosity
light coloration
textures of rocks
vesicular: air pockets
glassy
pyroclastic: lightweight and light colored
sedimentary rocks
rocks from pre-existing rocks and biologically produced
clastic
grains in the rock
course vs fine size
round vs angular shape
poorly vs well sorting
high vs low energy
close vs far distance
environmental clues
carbonate
reacts to HCl
low energy
fossils
biogenic
dark, plant material
low energy
swamps/bogs
metamorphic
response to changes in temperature, pressure, and/or interaction with hydrothermal fluids
NO MELTING
low grade metamorphosis
no banding
high grade metamorphosis
defined banding
types of stress
horizontal compression
shearing
foliation vs nonfoliation
higher grade = more foliation
layering gets more obvious the higher the grade
