Chapter 5 - Igneous Rock Flashcards

1
Q

mafic dyke

A

a fracture in the rock that is filled with magma from beneath - different composition than surrounding rock

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2
Q

plutonic rock

A

rock that is formed from great depths within crust or mantle

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3
Q

phaneritic

A

minerals large enough to see with unaided eye

ex. granite

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4
Q

aphanitic

A

minerals too small to see

ex. phyolite

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5
Q

glassy

A

no obvious minerals

ex. obsidian

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6
Q

porphyritic

A

two distinct mineral sizes

ex. porphyritic basalt

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7
Q

vesicular

A

many holes or pits in rock surface caused by the trapping of escaping gas
ex. vesicular basalt

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8
Q

pyroclastic

A

fused, glassy fragments, ash, and blocks of rock from explosive volcanic eruption
ex. tuff

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9
Q

lava types

A

pahoehoe - smooth and ropy

Aa - sharp and jagged

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10
Q

phenocrysts

A

large crystals embedded in porphyritic rocks

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11
Q

mafic rocks

A

rocks that are more dense and contain more iron and magnesium

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12
Q

felsic rocks

A

rocks that are less dense and contain more silica

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13
Q

felsic rock examples

A

extrusive- rhyolite

intrusive- granite

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14
Q

intermediate rock examples

A

extrusive- andesite

intrusive- diorite

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15
Q

mafic rock examples

A

extrusive- basalt

intrusive- gabbro

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16
Q

ultramafic rock examples

A

extrusive- peridotite

intrusive- komatiite

17
Q

Bowen’s reaction series

A

describes the order and process of magma crystallization

18
Q

dike

A

magma tube that forms in cracks and crosses through layers of rocks

19
Q

pluton

A

smaller body of magma

20
Q

batholith

A

very large body of magma

21
Q

xenoliths

A

solid pieces that have formed in magma (fragments of country rock)

22
Q

sill

A

horizontal dike

23
Q

laccolith

A

a sill that contains high pressure magma and lifts the crust above it

24
Q

discordant intrusions

A

any magma body that cut across layers of country rock that they intrude

25
veins
mineral deposits within rock fractures that are foreign to surrounding country rock.
26
pegmatites
veins of extremely coarse-grained granite due to slow cooling process. water brings elements to crystallization sites. important source of rare minerals, gemstones, and industrial metals