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Correlation Course > Petrology > Flashcards

Petrology Flashcards

1
Q

If coarse-grained igneous rock is composed of >90% plagioclase and <10% olivine and pyroxene, then the name of this rock according to the IUGS classification is

  • olivine gabbro
  • olivine websterite
  • tonalite
  • anorthosite
A
  • anorthosite
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2
Q

A silica-undersaturated plutonic igneous rock is

  • granodiorite
  • nepheline syenite
  • syenite
  • anorthosite
A
  • nepheline syenite
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3
Q

A coarse-grained igneous rock containing almost equal amounts of alkali feldspar and plagioclase

  • gabbro
  • monzonite
  • tonalite
  • anorthosite
A
  • monzonite
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4
Q

A coarse-grained crystalline rock with <90% mafics, >60% felsic being foids.

  • foidolite
  • granite
  • syenite
  • granodiorite
A
  • foidolite
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5
Q

Monzogranite is often called

  • trachyte
  • tonalite
  • adamellite
  • monzonite
A
  • adamellite
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6
Q

It is the fine-grained equivalent of syenite

  • rhyolite
  • trachyte
  • latite
  • foidite
A
  • trachyte
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7
Q

Fine-grained felsic igneous rocks lacking quartz, with felsic comprising 10-60% foids and alkali feldspar/total feldspar >0.9

  • phonolite
  • latite
  • basalt
  • andesite
A
  • phonolite
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8
Q

The fine-grained equivalent of diorite.

  • andesite
  • basalt
  • rhyolite
  • dacite
A
  • andesite
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9
Q

A fine-grained igneous rock with felsic comprising >20% quartz and alkali feldspar/ plagioclase <0.5.

  • basalt
  • rhyolite
  • dacite
  • andesite
A
  • dacite
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10
Q

Fine-grained igneous rock with felsic comprising 10-60% foids and alkali feldspar/ total feldspar <0.1%, <10% olivine

  • trachyte
  • tephrite
  • phonolite
  • latite
A
  • tephrite
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11
Q

Crystals so small that they cannot be seen with the naked eye.

  • aphanitic
  • phaneritic
  • poikilitic
  • vitrophyric
A
  • aphanitic
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12
Q

Phenocrysts contain numerous inclusion of another mineral that they enveloped with growth

  • poikilitic
  • spinifex
  • phaneritic
  • aphanitic
A
  • poikilitic
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13
Q

Plagioclase overgrowths on orthoclase (K-feldspar)

  • variolitic
  • rapaviki
  • poikilitic
  • spherulitic
A
  • spherulitic
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14
Q

The texture of andesite is common:

  • porphyritic
  • spinifex
  • spherulitic
  • phaneritic
A
  • porphyritic
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15
Q

The common texture of komatite:

  • phaneritic
  • ophitic
  • panidiomorphic
  • spinifex
A
  • spinifex
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Correlation Course (15 decks)

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