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3.7 Fold Interference Patterns


This sequence duplicates the well known fold interference patterns of Ramsay, although see Theissen & Means and Theissen for a more complete scheme.

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Block
Gravity
Magnetics
Magnetics
Magnetics at Pole
Magnetics at Pole 1VD
A

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This is a type 1 pattern, also known as a dome and basin pattern.
B

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This is a type 1 pattern, and is also a form of dome and basin pattern.
C

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This is a type 0 pattern, where the two fold systems are completely parallel (and it is thus unlikely you would be able to distinguish the two phases of folding).
D

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This is a type 1 (+2) pattern.
E

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This is a type 1 (+2) pattern.
F

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This is a type 3 pattern.
G

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This is a type 2 pattern, also known as a mushroom pattern.
H

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This is a type 2 pattern, also known as a mushroom pattern.
I

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This is a type 3 pattern.

Key
Survey Specifications
Scales
blue layer
r = 0k = 0
yellow layer
r = 1k = 10-2
image width
10,000m
Inclination
50° or 90°
Intensity
50,000 or 70,000 gamma
Flying height
80m

max



min

max



min

Ramsay, 1967, Folding and Fracturing of Rocks, MacGraw-Hill, p531.
Theissen & Means, Journal of Structural Geology, 2, pp311-316.
Theissen, 1986, Journal of Structural Geology, 8, pp563-573.

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