This curve is proportional to the geotherm (the radiation per metre in Watts of the crust.)
No doubt it is proportional,...but are there known interferences to the proton probe determination of nickel temp, and chrome pressure determination.
DeBums are finding differences in the inclusions from different diamond stability zones. Their attempts to identify diamonds by their composition, physical properties and crystal structure are hinting that the mantle can vary significantly in composition and physical conditions under different cratons, and within the same craton, and the diamonds they produce can look somewhat similar to the untrained eye, but differ quite a bit on the molecular level, hence the study of inclusions among other things.
I know you know quite a bit about proton probe and chrome determinations,...what are the interferences to these determinations, and are they significant enough to cause errors in the final results, in this case determining an approximate radiation value of the host geotherm, and comparing these values from different places? What about types of operator error? Can variation in the conditions as the magma ascending from the diamond stability region of the mantle up to the surface of the earth cause readings to vary? Finally can differences in the physical and chemical conditions at the surface or near surface change the compositions and structure of components of the K rock in any way?
Ever come across estimations of how thick a diamond stability field could be? If several kilometers deep (imagine several kilometers of diamonds) how much could the geotherm values vary across its thickness? How much does the garnet stability field overlap the diamond stability field?
Perhaps we should be asking,...just what kind of damned diamonds are up there in the north,... and more to the point, maybe we should be charging more for them? (ggggggg) |
