Tutorials (PDF) - Tectonique.net

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2SHH]8YXSVMEP1ERYEPStep 2Now emplace a vertical cylindrical plug in the middle of the block. Drop a plugicon in the History window. Set the position of the plug somewhere in themiddle of the block, and select a rock type of Porphyry from the Rock PropertyDatabase list, which will give the plug a susceptibility of 1.7x10 -4 . (The rockproperty database may be edited by selecting Edit Rock Database... from theTools menu).Step 3Look at the mag<strong>net</strong>ic preview, just to see what the result looks like withoutalteration zones:Step 4Define the metamorphic aureole around this plug by clicking off the On buttonin the preview window. Change the alteration type to Both, and click on theEdit button.You will now be presented with an Alteration Profile Definition window, thatallows you to change the alteration profiles for each geophysical rock propertyindividually. For this example just worry about the bulk mag<strong>net</strong>ic susceptibility(when there is no anisotropy this is the X Axis (Sus) value). Select thisparameter from the Current Graph: list.Step 5Define the scaling parameters for this profile by clicking on the Options button.Set the Alteration Distance to 2000, the Min Scale Factor to -1 and the Max
8YXSVMEPScale Factor to +1, that is the width of the metamorphic aureole is 2000 m, andthe y axis on the profile plot will vary between 10 -1 to 10 +1 (as a log scale). Nowclick on OK to return to the profile definition window, and set the Profile Typeto Curve (Alt), which means all susceptibility values within 2000 m are theproduct of the original value and the alteration values defined by the profilesettings. Now draw a profile, such as the one shown below ranging between 2.0on the left (at the plug country rock boundary) and 1.0 on the right (2000maway from the plug):(IJMRMRKXLIQIXEQSVTLMGEYVISPIMRE4VSJMPI;MRHS[and preview the geophysical response again (by clicking on the On button),which should now look something like this:
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