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Gold/Mining/Energy : Canadian Diamond Play Cafi -- Ignore unavailable to you. Want to Upgrade?

To: VAUGHN who wrote (1119)	8/7/2003 6:31:39 AM
From: E. Charters	Read Replies (3) \| Respond to of 16206

Only comment I have is they seem to be not talking to two principles. One is that pipes of similar composition line up along faults (they did obliquely hint at this), and that G10's are not the whole story. There are different kinds of G10's and only the truly subcalcic G10's seem to count. But .. It is true that barren pipes may be near rich pipes, and that pipes of the same age and locus also usually have the same composition and diamond affinity. This is because they are probably from the same hot spot, and magma source. On the other hand, oxygen fugacity and speed of emplacement may differ, so there could be grade differences in some cases. We know too that in the same area, ages of emplacement, and therefore magma sources differ widely. (the crust moves over the sources in continental drift, the deep magma sources stay relatively immobile.) If there is an age-diamond correlation that is relative to an area then diamondiferousness in an area will vary widely despite the cluster effect. Why is this so? Because diamonds are transported from the mantle, they have little to do with the rocks in an area except as it relates to crustal thickness, and speed of emplacement. 46% G10's existing in their field sampling is heartening, because it may indicate that true subcalcic pyrope is also present in sufficient quantity. (14% of all pyrope should be extremely subcalcic by a sharp arbitrary demarcating line in order to indicate economics statistically). EC<:-}