Subduction Flashcards

1
Q

What is the cause of the Subduction Mountains?

A

Compressional stress

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2
Q

Where are the Subduction Mountains located?

A

Oceanic subduction zones (Japan)

Continental Subduction zones (Andes)

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3
Q

Forms where ocean crust goes down a trench

A

Accretionary Wedge

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4
Q

Thrust slices pile up over time with the youngest slice added at the ___

A

Base

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5
Q

Are fold and thrust zones unique to subduction?

A

No, it also occurs in a collision

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6
Q

Where the rocks are hotter and can slide a long distance, you get:

A

A fold and thrust belt

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7
Q

A mix of strong and weak rocks make:

A

Both folds and faults

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8
Q

Unique to continental subduction

A

Suspect Terranes

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9
Q

Smaller continents get dragged toward the trench

A

Suspect Terranes

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10
Q

They can’t subduct so they get added on instead

A

Suspect Terranes

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11
Q

When two large continents collide, they make wide and very complicated mountain belts.

A

Collision Mountains

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12
Q

Different compressional folds and faults form at different locations and depths

A

Collision Mountains

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13
Q

Bring ocean rocks to mountain tops

A

Thrust faults

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14
Q

Form deep underground

A

Large recumbent folds

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15
Q

To remove the ocean between two continents what do you need on at least one side

A

Subduction

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16
Q

Volcanic mountains deform rocks before the continents collide

A

Active Margin

17
Q

Quiet and undisturbed until it tries to go down the trench

A

Passive Margin

18
Q

Unique to collision

A

Suture Zone

19
Q

Ultramafic rocks end up smashed between the two continents, marking the former ocean

A

Suture Zone

20
Q

Folds and thrusts form on both sides of the:

21
Q

Deformation is worse on the side that tried to subduct =

A

The former passive margin

22
Q

Result of being under the two plates of collision

A

A much wider and deeper fold and thrust best than in subduction zones

23
Q

Fault blocks appear to rise up as mountains, but they are really sinking

A

Rift valleys

Rifting Mountains

24
Q

Can occur over a narrow or wide region

A

Rifting Mountains

25
Allow valleys to sink along facing foot walls
Normal faults
26
Ranges made from basin and range terrain
Horsts
27
Basins made by basin and range terrain
Grabens
28
One valley breaks through the crust forming a new ocean
Typical Rift
29
Hundreds of valleys form but none break through the crust
Soft Rifting