rider structural geology 310 2012 gcherman folds “horizontal fold” “mushroom fold”

Rider Structural Geology 310 2012 GCHERMAN Folds Folds “Horizontal fold” “Mushroom fold”

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Rider Structural Geology 310 2012 GCHERMAN

FoldsFolds

“Horizontal fold”

“Mushroom fold”

Rider Structural Geology 310 2012 GCHERMAN

A’

Rider Structural Geology 310 2012 GCHERMAN

A’

Rider Structural Geology 310 2012 GCHERMAN

Object grouped and scaled 95% in the vertical dimension

Fold plunges about 18o, therefore, cos 18 = .95

Vertical, cross-section plane

Fold-profile plane

18o

The profile view of the fold is looking down the fold plunge into

the profile plane (90o to the plunge)

This view of the fold is the vertical cross-section

Fold axis

A’A

Symbols:Name:

Rider Structural Geology 310 2012 GCHERMAN

Symbols:Name:

Rider Structural Geology 310 2012 GCHERMAN

0.6

1.8

0.6

1.818o

60o

75o

Tight, steeply-inclined,gently-plunging anticline

0.8

1.2

Width of unit A = 0.8 @ 52o

Actual thickness : sin 52 = x / 0.8 = 0.63

Plunge: TAN X = 0.63 / 1.2 = 28o

Open, upright, gently-plunging syncline

ILA = 76o

90o

ILA = 30o

Profile

Rider Structural Geology 310 2012 GCHERMAN

EXPLANATION:

Anticline

Syncline

O - outlier

I - inlier

D – depression

C - culmination

Rider Structural Geology 310 2012 GCHERMAN

Explanation:

Rider Structural Geology 310 2012 GCHERMAN

Structure contours for a limb

Use the structure contours to figure out the limb dip, which is the same dip value for all limbs,

Hinge point

Name:

Rider Structural Geology 310 2012 GCHERMAN

Name:

260

150

22o

WISP FELL

Open, steeply inclined, horizontal anticline

Thickness: SIN 22 = z / 150 = 56 m

Dip: TAN X = 20 / 40 = 26o

Open, steeply inclined, horizontal syncline

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rider structural geology 310 2012 gcherman folds “horizontal fold” “mushroom fold”

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