EASC101 > Igneous Rocks > Flashcards

Igneous Rocks Flashcards

(12 cards)

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1
Q

extrusive igneous characteristics

A
  • cooled on surface
  • mineral crystals often not visible (aphanitic)
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2
Q

phaneritic

A

visible crystals

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3
Q

aphanitic

A

no visible crystals

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4
Q

porphyritic

A

mix of phaneritic and aphanitic

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5
Q

pyroclastic

A

made from volcanic ash

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6
Q

mafic rocks example

A

melt at high temperatures (mantle)
eg. Ca-rich plagioclase

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7
Q

intermediate rocks example

A

medium temp melting (oceanic crust)
eg. amphibole

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8
Q

felsic rock exampple

A

low heat melting
eg. quartz, muscovite

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9
Q

dike

A

magma intrusions that cut across layers

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10
Q

sill

A

magma intrusions that cross between layers

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11
Q

laccolisth

A

parallel to layers

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12
Q

batholiths

A

large magma intrusions

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EASC101
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