- heat flow relations
RGB airborne radiometric image of the
Pilbara - with K concentration on the red colour channel, Th on the green
colour channel and U on the blue colour channel.
Light colours are high heat
producing granitic rocks, dark colours are low heat production basaltic
The HPE's are lithophile and strongly fractionated by crust froming
explaining the relative enrichment of the upper crust in the HPEs.