Mountain Building and Crustal Deformation. Economic Consequences of Geologic Structures Tracing Coal Seams, Aquifers, etc. Ore Deposits are often localized.

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Presentation transcript:

Mountain Building and Crustal Deformation

Economic Consequences of Geologic Structures Tracing Coal Seams, Aquifers, etc. Ore Deposits are often localized along faults and folds Petroleum Traps

Isostasy

Thickness and Density

Isostatic Rebound in Canada

Mountain Building (Orogeny) Orogeny is the variety of processes that occur during mountain-building, including: Distinctive Patterns of Deposition Deformation Metamorphism Intrusions Volcanic Activity Oceanic Trenches Seismic Activity

A Subduction Zone

Metamorphism and Orogeny

Why Mountains are High

How Fast Can Folds Form?

Hutton’s Unconformity, Scotland

Large Fold, Turkey

Eroded Fold, Pennsylvania

Fold in Glacier, Antarctica

Anticlines and Synclines

Folds, Pennsylvania

Which Way was Up? Sedimentary Structures are governed by: Gravity Exposure to the Surface They all have a “right way up”

Foliation Foliation is a sheetlike structure that forms when rocks are deformed.

Foliation In every case, the foliation is: In the direction of least resistance at right angles to the direction of greatest compression.

Axial Plane

Folds and Foliation

On a small scale (microscopic to centimeters), foliation forms On a large scale (centimeters to kilometers), rocks fold. Both foliation and the axial plane of the fold are at right angles to the direction of greatest compression.

Fold And Foliation

Growth of Minerals

The Importance of Minor Folds

Minor Folds and Foliation Are Clues to Much Larger Structures

How Geologists Use These Clues Here's an outcrop that might be seen in the field.

How Geologists Use These Clues We can mentally fill out the rest of the fold. Note that we still have no idea how big the fold is, only what kind it is.

Complex Folds, Scotland

Faults, Appalachians

Thrust Faults in Snow

Domes and Basins