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Gold/Mining/Energy : Winspear Resources
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To: teevee who wrote (11755)1/13/1999 12:31:00 PM
From: VAUGHN  Read Replies (1) of 26850
 
Hello Teevee

Most diamondiferous kimberlites have populations of both eclogitic and peridotitic diamonds. The eclogitic tend to be formed at a deeper level and are probably associated with the 300km sourced stones you referred to. They also tend to be the larger stones according to my reading. The depth you suggest intrigues me though. Can you tell me how you arrived at this conclusion as I am not aware of any mantle root that deep under the Slave Craton at least the Lithoprobe data does not suggest that.

When you suggest multiple cones based on the variation in the diamond source depth and population, you should also keep in mind that phased emplacement is fairly common and often separated by considerable time spans. Different types of kimberlite with different chemistries and diamond types and populations are often found within the same diatrem. I have heard of I believe, as many as eight distinct emplacement phases. Therefore, while root zones may have multiple sills, they are just as likely to have kimberlite consistency/chemistry variations.

That is one of the reasons why only a bulk sample can provide and be considered a true indication of a kimberlite's grade. Be cautious about drawing conclusions from very small sample sizes or very localized sample sites.

Regards
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