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To: long-gone who wrote (89510)	9/12/2002 10:17:48 AM
From: E. Charters	Respond to of 116798

We have been using this science related to the chemistry of the grains found in diamonds, called the inclusion minerals, for perhaps 40 years now in diamond exploration. In fact, economic diamond explorationists in Australia, (particularly) Russsia (Yuri and Nikolai Sobolev), South Africa (Gurney), and Canada (Mitchell) formed these theories and developed these methods that are talked about in this article. The fact that these inclusion minerals (pyrope and diallage) are formed with diamonds at certain temperatures and pressures allows us to explore for diamonds by targetting the much more abundant inclusion and associated minerals. This science is called geobarythermometry. One of its methods examines the trace elements and major elements of a mineral by electron and proton probe methods, deducing its melted formational temperature and pressure from eutectic experimental curves and thus its probability of being associated with diamond at the pressure and temperature of which diamond is stable in formation. This is called the diamond stability field. All of this science developed out of research that was driven by diamond exploration and was not from pure earth science. Its most protean exponents in the field of trace element analysis and grade prediction are presently a US group working in Australia, Griffin and Ryan. EC<:-}