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Gold/Mining/Energy : Twin Mining (formerly Twin-Gold)
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To: Letmebe Frank who wrote (374)3/21/2002 3:12:37 PM
From: VAUGHN  Read Replies (1) of 613
 
Hello Letmebe Frank

Your welcome.

Here is a graphic that may help:
agc.bio.ns.ca

Regarding your comments:
So a deep mohorivicic discontinuity over a large area would define a craton?

No, but it would be consistent with a craton. I believe jpthoma1 gave you a good definition of a craton in his post (358)

Archaean craton, is continental crust older than 2.5 billion years in age.

Archaean cratons have relatively cool lithospheric roots in which there exists a downward deflection of isotherms and a corresponding upward deflection of the diamond stability field.

This region of high pressure and relatively low temperature (less than about 1200 o C) provides a “window“ in which diamonds can form and be preserved.

See:
geology.iastate.edu

litho.ucalgary.ca

You may also find this discussion of interest/relevant:
litho.ucalgary.ca

On a separate but related note, see discussion of Archean geotherms under RESULTS AND CONCLUSIONS:
es.mq.edu.au

The last URL goes to my comments regarding Sommerset Island kimberlite geotherms. Whether JI kimberlites have the same or lower geotherms has yet to be reported. I asked Rothwilda to provide that data but she declined expressing concern that "it would give the competition a valuable insight that TWG was not prepared to give."

Hope the above addresses any questions.

Regards

Vaughn
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