mountain building and crustal deformation
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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 .

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Presentation Transcript
economic consequences of geologic structures
Economic Consequences of Geologic Structures
  • Tracing Coal Seams, Aquifers, etc.
  • Ore Deposits are often localized along faults and folds
  • Petroleum Traps
mountain building orogeny
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
which way was up
Which Way was Up?

Sedimentary Structures are governed by:

  • Gravity
  • Exposure to the Surface

They all have a “right way up”

foliation
Foliation

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

foliation1
Foliation

In every case, the foliation is:

  • In the direction of least resistance
  • at right angles to the direction of greatest compression.
folds and foliation1
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.
how geologists use these clues
How Geologists Use These Clues
  • Here\'s an outcrop that might be seen in the field.
how geologists use these clues1
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
Complex Folds, Scotland

Complex Folds, Scotland

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