Creation of an anomaly map using Surfer 7

 

Input data are stream sediment Cu analyses (AAS, 1-gram aliquot, HNO3 digestion) from Central Yukon (GSC Open File 518).

 

Step 1: Original Input Data (all geochemical variables except Cu removed)

Step 2: Cu values are converted to percentiles

Cu values corresponding to key percentiles

Step 3: Surfer 7 is opened and Map Post Map New Classed Post is selected

 

Step 4: Excel file created in Step 2 is selected (Surfer 7 will read Excel 2000 files; for older versions, file should be saved as Excel 3.0 or earlier, or as ASCII)

Step 5: Easting (X), Northing (Y) and Posted (Z) Variables are selected

 

Step 6: Number of classes is selected

Step 7: Boundaries of classes are adjusted (double-clicking in selected field opens dialog box)

Step 8: Symbol types, sizes and colours are selected. This dialog box is opened by selecting a symbol (see Step 7) and double-clicking on it

First Try. Circles slightly too large, northings wrongly aligned

 

Step 9: Properties of map are adjusted by right-clicking mouse inside map area, opening this dialog box and clicking on Properties.

Step 10: Size of circles is adjusted

 

Step 11: This axis properties dialog box is opened by right-clicking the mouse on the axis. The angle (circled) will be altered from 270 degrees to 0

Result. Options exist to add scale bar, symbol legend, etc., and to import base map if available

 


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