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6.2 Enrichment alteration halo around a plug


This model shows the results of emplacing a plug in an area of tilted folds. The density and susceptibility values are modelled as enrichment haloes where the rock properties are varied as a function of distance from the plug, before returning to normal as the distance away increases.

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Block diagram of unaltered geology

Block diagram showing the geology of the model with plug intrusion but no alteration halo. The top layer has been removed to show the internal structure of the model. Colours are used simply to highlight the structures.

 
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Block diagram showing density variations in altered geology

Block diagram showing the geology of the model with plug intrusion and alteration halo. The top layer has been removed to show the internal structure of the model. Colours are used to demonstrate density variations, using a rainbow look up table.

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Block diagram showing magnetic susceptibility variations in altered geology

Block diagram showing the geology of the model with plug intrusion but no alteration halo. The top layer has been removed to show the internal structure of the model. Colours are used to demonstrate magnetic susceptibility variations, using a rainbow look up table.

Link
Gravity
Magnetics
Magnetics
Magnetics at Pole
Magnetics at Pole 1VD
No alteration

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Open magnetics with Noddy

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Open magnetics with Noddy

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Open magnetics at pole with Noddy

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Open magnetics at pole 1VD with Noddy

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Note the relatively uniform intensity values (except at the north plunging hinge) in the folded layer. Note the relatively uniform intensity values (except at the north plunging hinge) in the folded layer.   Note the relatively uniform intensity values in the folded layer. Note the relatively uniform intensity values (except at the north plunging hinge) in the folded layer.
Alteration

Open history with NoddyOpen FracViewer Movie
Open gravity with Noddy

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Open magnetics with Noddy

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Open magnetics with Noddy

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Open magnetics at pole with Noddy

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Open magnetics at pole 1VD with Noddy

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Note the strong localisation of the high intensity field in the parts of the folded layer adjacent to the plug. Note the strong localisation of the high intensity field in the parts of the folded layer adjacent to the plug. Note the relatively uniform intensity values (except at the north plunging hinge) in the folded layer. Note the strong localisation of the high intensity field in the parts of the folded layer adjacent to the plug. Note the strong localisation of the high intensity field in the parts of the folded layer adjacent to the plug.

Key
Survey Specifications
Scales
red
r = 2.9k = 10-3
background
r = 2.4k = 5×10-5
plug
r = 2.5k = 1.7×10-4
image width
10,000 m
inclination
50° or 90°
intensities
50,000 or 70,000 gamma
flying height
80 m

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min

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min

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

WWW conversion by Ian Brayshaw