Geography M1 Intrusive Volcanic

OBJECTIVESOBJECTIVES

Intrusive Intrusive Volcanic Volcanic FeaturesFeatures

Sills & DykesSills & Dykes

Laccoliths & Laccoliths & LopolithsLopoliths

BatholithsBatholiths

INTRODUCTIONINTRODUCTION

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GeographyGeography Module 1 Module 1 Unit 4 Unit 4 Lesson 26 Lesson 26







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You would have studied extrusive volcanic features that are formed on the surface of the earth, and is easily seen by all.

This presentation will help you to become familiar with how intrusive volcanic features are formed within the earth’s crust .

Intrusive volcanic features only become exposed after weathering and erosion. Nevertheless they contribute to spectacular features on the earth’s surface.

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At the end of the lesson, you will be able to:

1. identify sills, dykes, laccoliths, lopoliths, batholiths and plugs.

2. describe each intrusive volcanic feature.

3. explain how each intrusive volcanic feature is formed.

4. explain the process that takes place for each intrusive volcanic feature to be exposed at the surface of the earth, giving an example of each.

5. demonstrate an appreciation for volcanic landforms.

6. develop an interest in the volcanic activities occurring within the earth.

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EXTRUSIVEEXTRUSIVEAbove the Above the

earth’s surfaceearth’s surface

INTRUSIVEINTRUSIVEBelow the Below the

earth’s surfaceearth’s surface







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Can you identify the intrusive volcanic features seen here?

5CHECK







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Can you identify the intrusive volcanic features seen here? Click the ANIMATE button.

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ANIMATE

LaccolithDike

Sill

Batholith







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Can you identify the intrusive volcanic features seen here?

7Did you see these features? CLICK here







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Can you identify the intrusive volcanic features seen here? Click the ANIMATE button.

8Did you see these features? CLICK here

ANIMATE







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Did you see these features? See diagram below.

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Can you identify the sill in this diagram?

10It is the feature highlighted in It is the feature highlighted in blue-greenblue-green..







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Instructions:

1. Read each question and type your response in the box below. Click the CHECK button for feedback.

2. You need to be in slide show view to type and edit text.

1. A sill is a sheet like injection of magma between layers of sedimentary rock. It ranges from a few feet to hundreds of feet thick.

2. A sill is formed when magma cools and solidifies along the bedding plane.

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SIL

LS

ILL

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SILLSILL

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Instructions:

1. Read each question and type your response in the box below. Click the CHECK button for feedback.

2. You need to be in slide show view to type and edit text.

The dyke is the feature highlighted in blue-greenblue-green. The dyke cuts across the bedding plane whereas the sill runs along the bedding plane.

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The dyke tends to be vertical or near vertical whereas the sill tends to be horizontal or slightly inclined.

The dyke may reach the surface whereas the sill is usually exposed at the surface after erosion takes place.

Continue

Continue

Click for Photo







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DY

KE

DY

KE

PL

UG

PL

UG

DY

KE

DY

KE

PL

UG

PL

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Can you identify the laccolith in this diagram?

Do you notice its shape?

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The laccolith is highlighted in the blue-greenblue-green colour. The laccolith has a dome shape.

Click for Photo







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Laccolith

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Both formed when magma cools and solidifies.

Do you notice the difference in their shape?

Lopolith– saucer shaped

CHECKCHECKCHECKCHECK

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Laccolith– dome shaped







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A batholith is highlighted in the blue-green blue-green colour in the diagram below. How is a batholith formed?

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The largest intrusive body.A large former magma chamber at shallow depth. Dome-shaped intrusions of magma occurring at the base of mountains or deep within the earth’s crust.

Click for Photo







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Batholiths







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Batholith, Dyke, Lacolith, http://www.indiana.edu/~geol105/images/gaia_chapter_5/igneous_rock_bodies.htm#batholith

Intrusive Volcanic Features http://www.uwgb.edu/dutchs/EarthSC202Notes/igneous.htm

Laccolith http://www.indiana.edu/~geol105/images/gaia_chapter_5/igneous_rock_bodies.htm#batholith

Laccolith and Lopolith http://vankid.deviantart.com/art/Laccolith-and-Lopolith-86364109

Sill http://www.summitpost.org/palisades/607012 Volcanic Landforms:

http://www.indiana.edu/~geol105/images/gaia_chapter_5/dike&sill.jpg

Intrusive explanatory diagrams http://www.indiana.edu/~geol116/week4/wk4.html

Intrusive Featureshttp://1two3.co.za/geography/geogwiki/grade-10/geomorphology/introduction/

Geography M1 Intrusive Volcanic

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