Snow and Ice as Sediment and Rock?. Snowflakes as Mineral Crystals!. Analogs for rock-forming processes. Ideas from William D. Romey’s “Winter Ice and Snow as Models of Igneous Rock Formation” (1983). . . . and glacial ice a an analog for metamorphic rock.
Snowflakes as Mineral Crystals!
Ideas from William D. Romey’s
“Winter Ice and Snow as Models of
Igneous Rock Formation” (1983)
for metamorphic rock . . .
How do melts (magmas) of
water and silica differ?
frazil ice and lava bars
pressure ridges and tumuli
dikes and sills
. . . and fluid inclusions in sea ice
in helping to understand what goes on deep below the earth’s surface
where silicate magmas are generated.
also provides analogs of
fracturing, rifting, subducting.
Revise the map as needed after any step!
Romey “Snow and Ice as Models of Igneous Rock Formation.”
Look for concepts that organize the information.
Remember that the “big idea” is that analogy
plays an important role in geologic reasoning.
Eutectic point: the common melting and freezing temperature
of a homogeneous mix of minerals at a particular pressure and
in just the right proportion to each other.
For example: the freezing temperature of salt water.
Anatexis: the partial melting of rock, typically at temperatures
well above 600o C and often leading to the formation of