Some Resources on Mars have been mapped using the gamma ray spectrometer instrument of Mars Odyssey[1].
Using the radiation signatures of elements with radioactive isotopes, maps of surface abundance of Hydrogen, Thorium, Chlorine, Iron, Silicon, Potassium have been made.
Thorium abundance in ppm (parts per million)
Chlorine abundance. % weight
Silicon abundance %weight
Potassium abundance %weight
References
