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GEOL131A > IGNEOUS > Flashcards

IGNEOUS Flashcards

1
Q

From Latin word “________” meaning fire

A

Ignis

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2
Q

It is based on size, shape, arrangement and degree of crystallinity

A

Texture

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3
Q

The minerals present in this rock type are Pyroxene, amphibole ± olivine, and biotite

A

Gabbro/Basalt

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4
Q

example of intrusive rocks.

A

Granite or Diorite or Gabbro or Peridotite

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5
Q

Large igneous bodies deep beneath the Earth.

A

Pluton

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6
Q

Nearly vertical structure that cuts across pre-existing layering

A

Dike

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7
Q

Nearly horizontal structure injected between pre-existing layering

A

Sill

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8
Q

Dome-shaped intrusion

A

Laccolith

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9
Q

Lenticular intrusion with a depressed central region

A

Lopolith

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10
Q

Angular clast (greater than 64 mm)

A

Blocks

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11
Q

Rounded clast (greater than 64 mm)

A

Bombs

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12
Q

Igneous rocks that are 2-64mm in diameter

A

Lapilli

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13
Q

Igneous rocks that are 2 mm lo diameter

A

Ash

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14
Q

Fragments of rocks.

A

Lithic

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15
Q

Glassy fragments

A

Vitric

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16
Q

Measurements of the fragments of rocks erupted by a volcano.

A

Pyroclastic Size

17
Q

The magma type Andesitic ranges from ______ to ________ temperature.

A

900-1000 °C

18
Q

The viscosity of an ultrabasic magma is called _______

A

Low to Very Low

19
Q

Ultramafic, mafic and felsic are ________ terms

A

Color

20
Q

This is formed when there is decrease in pressure, addition of Volatiles or heat
transfer from rising magma.

A

Magma

21
Q

Determines the percentage of dark-colored and light-colored minerals

A

Composition

22
Q

Based on completeness of crystal form and size

A

Crystal Form

23
Q

The depth of this structure is greater than 100km².

A

Batholith

24
Q

What do you call a crystal form that has complete crystal faces.

A

Euhedral

25
Q

It has no observable crystal faces

A

Anhedral

GEOL131A (10 decks)

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