Igneous rocks
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Igneous Rocks. Chapters 3 & 4. Arcadia Nat’l Park, Maine. How do Igneous Rocks form? What is Magma ? What is Lava ? How do they form? What are the two categories of igneous rocks? How does each type form? How are plutons & volcanoes related?. How Hot Is Lava?.

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Igneous Rocks

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Igneous Rocks

Chapters 3 & 4

Arcadia Nat’l Park, Maine


How do Igneous Rocksform?

What is Magma?

What is Lava?

How do they form?

  • What are the two categories of igneous rocks?

  • How does each type form?

    How are plutons & volcanoes related?


How Hot Is Lava?

  • How long does it take lava to cool?


Where Does Magma Originate?

Where are Magma Chamber located?


What is the Geothermal gradient?

How does pressure affect the melting point of a rock?


How does water affect rocks at depth?


TEXTURES of Igneous Rocks

  • What is Texture?

  • What does a rock’s grain size indicate?

    What is Aphanitic texture and what does it indicate?


TEXTURES of Igneous Rocks (cont.)

  • What is Glassy texture & what does it indicate?

  • What is Vesicular texture & what does it indicate?

a

b


TEXTURES of Igneous Rocks (cont.)

What is Phaneritic texture & what does it indicate?


TEXTURES of Igneous Rocks (cont.)

  • What is Porphyritic texture & what does it indicate?


TEXTURES of Igneous Rocks (cont.)

  • What is Pyroclastic (fragmental) texture & what does it indicate?


Magma Composition

What is the most abundant constituent of magma?

  • What characteristics do Felsic magmas have?

  • What characteristics do Intermediate magmas have?

  • What characteristics do Mafic magmas have?

  • What characteristics do Ultramafic magmas have?


Composition of Igneous Rocks

  • What controls the type of rock that forms?

    What are the 4 Magma Modification Processes?


What is Crystal settling?


What is Assimilation?

How does it affect a magma’s composition?


  • What is Magma mixing & how does it affect a magma’s composition?


Who discovered Bowen’s Reaction Series?

What is Bowen’s Reaction Series?


How are Igneous Rocks Classified?


A

B

  • Felsic are _______ colored b/c they’re composed of orthoclase, Na-plagioclase, & quartz.

    Rhyolite (A) Granite (B) [most common intrusive rock]


Pegmatites are __________________ (grains >1 cm in diameter) & are mineralogically similar to ______.

  • These mineral grains crystallized from ______________

    ____________________________________________.


Intermediate contain _________ amts of _________ colored ferromagnesian silicates, & _________ colored feldspar.

Andesite (A) Diorite (B)

[erupts from island arcs]

B

A


A

Mafic rocks are ______colored b/c they’re largely composed of ______________________________________.

Basalt (A) Gabbro (B)

B


Ultramafic are _____ colored b/c they are comp. of ________________________________ silicates.

What are Peridotites composed of olivine?

Where are Peridotites formed?


What is Volcanic Glass composed of?

What rock type has a similar composition?

Why can volcanic glass be different colors?

What are vesicles & how are they formed?

Pumice

Obsidian


What are Tuffs?


How do magmas move?

What is Magma type at Divergent Margins & Hot Spots?

What are the Magma Types at Convergent Margins?

How are these magmas

formed?


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