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2.1.2 Variation in fold plunge direction of sinusoidal folds
2.1.2bn  


This sequence shows the affect of varying the fold plunges direction for a set of open sinusoidal folds in a 200 m thick layer, with fold axes plunging at 60°.

Notice the variations in field strength between hinges and limbs in both the gravity and magnetic images, the assymmetry between limbs in folds which are not plunging due north or south, and the marked differences between the north and south plunging magnetic images.

All block diagrams are viewed from SW.

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Link
Block
Gravity
Magnetics
Folds plunging to 000 (North)

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Notice the strong asymmetry of the magnetic anomaly in north-south sections, and the asymmetry between the anticlines in the north and the synclines in the south.
Folds plunging to 030

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Notice the asymmetry of the magnetic anomaly between north-east and south-west facing limbs.
Folds plunging to 060

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Folds plunging to 090

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Folds plunging to 120

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Folds plunging to 150

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Folds plunging to 180

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Notice the symmetry of the magnetic anomaly in north-south sections, but the asymmetry between the anticlines in the north and the synclines in the south for the gravity but not magnetic images.

Key
Survey Parameters
Scale
layer
r = 1k = 10-2
background
r = 0k = 0
image width
10,000 m
Inclination
50°
Intensity
50,000
Flight height
80 m

max



min

All models created using
Noddy
Copyright © 1998-2002 AGCRC & Mark Jessell

WWW conversion by Ian Brayshaw