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Gold/Mining/Energy : A Little Forum For Gold Microclusters

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To: Michael J. Wendell who wrote (6)	8/5/1997 5:53:00 PM
From: Jim Steel	of 142

Dredging up sulphide petrology from my overtaxed brain leads me to suggest the following - at least if it is wrong, you could tell me to get the books out from that university course finished, oh, 18 years ago. PGM's occur in ultrabasic rocks reasonably close to surface as witnessed in the Great Dyke in Zimbabwe and the Stillwater intrusion in Montana. All one needs is some mantle derived rocks, a conductive heat cell, and a good degree of immiscibility with respect to Pt and Pd. Given the heat and pressure of below - Moho rocks, what sort of volatile phase would exist? I think there would have to be a dense volatile phase to emplace a kimberlite structure in an almost perfect carrot shape in mid-cratonic rocks; rocks that by virtue of granitoid or metamorphic composition would not necessarily provide fault and fracture based solution pathways so necessary in epithermal environments. So while there may be little sulphur in kimberlites or other ultrabasic rocks, could there have been at one time? I really scratch my head trying to figure out how a D flawless dodecahedral diamond can form from a bit of primordial charcoal... Ujina

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