Class 12 Geochemistry Plotting Exercise
Objective: Plot stream sediment survey geochemical values, and
contour soil geochemical values
Procedure:
Copper is a pathfinder element for platinum deposits in ultramafic rocks.
Contour the copper-in-soil values on the soil grid map as follows:
- Draw the isopleth (curve) for a copper value of 100 ppm. For example, if the value at one location is 50 ppm and the value at an adjacent location is 150 ppm, then the 100 ppm isopleth will be halfway between these two locations.
- Draw the isopleths for copper values of 200 ppm, 300 ppm, 400 ppm, and 500 ppm.
- Color the map with red for areas with >500 ppm, orange for areas with 400 – 499 ppm, green for areas with 300 - 399 ppm, and blue for areas with 200 – 299 ppm.
Download the soil grid map (PDF).