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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.

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Presentation Transcript
snow and ice as sediment and rock

Snow and Ice as Sediment and Rock?

Snowflakes as Mineral Crystals!

slide2

Analogs for rock-forming processes

Ideas from William D. Romey’s

“Winter Ice and Snow as Models of

Igneous Rock Formation” (1983)

slide3

. . . and glacial ice a an analog

for metamorphic rock . . .

slide4

How does water differ from silica?

How do melts (magmas) of

water and silica differ?

slide5

Flow structures:

frazil ice and lava bars

pressure ridges and tumuli

dikes and sills

slide7

From snowflake to hoar and firn

. . . and fluid inclusions in sea ice

slide9

Melting of the ice covering rivers and lakes can serve as a useful analog

in helping to understand what goes on deep below the earth’s surface

where silicate magmas are generated.

slide10

The break-up of ice on rivers and lakes

also provides analogs of

plate-tectoncis mechanisms:

fracturing, rifting, subducting.

slide11

Working in pairs, make a

  • concept map of a section of
  • Snow and Ice as Models of
  • Igneous Rock Formationby W. Romey.
  • Simplest directions:
    • Read the section
    • Decide upon a focus question
    • List key concepts
    • Arrange concepts (by association and hierarchy)
    • Link the nodes
    • Label the links

Revise the map as needed after any step!

slide12

Do not worry about all of the technical terms in the

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

metamorphic rock.