You're welcome! Interestingly Kenn. reports the kims are about 71 million years old. Youngest yet in AB, that I'm aware of... Ashton's are around the 86million mark... The Monopros Mountain Lake kimberlite is around 75Ma. MMU has found evidence in their area of such around 85Ma or a lil younger.
I say this based on the following:
Today's Kennecott report:
"Reliable age dates have been obtained from Royal Ontario Musewn, on the Phoenix kimberlites using U/Pb from Perovskite and K/Ar from Phologpite. The age returned for both mineral species was 71 million years"
From Ashton's IKC '98 paper:
victoryventures.com
"U-Pb dating of perovskite suggests that the Buffalo Hills kimberlites were emplaced between 86 (+ or -) 3 and 88 (+ or -) 5Ma."
From past MMU notes:
"Marum has reported kimberlite component minerals are residual grains in a Cretaceuos age [~85Ma]" and, "Outcrops consist of Upper Cretaceous sedimentary rocks of the same age as the surface rocks that occur on the Ashton/AEC property."
From APEX Geoscience paper:
victoryventures.com
"The inferred ages of the currently known kimberlitic diatremes, based on stratigraphic evidence, indicate that the Buffalo Head Hills kimberlites may be early Turonian (i.e., about 90 to 85 Ma, existing within the Second White Specks or Dunvegan Fm or equivalents), whereas the Mountain Lake kimberlite is somewhat younger, late Campanian (i.e., about 75 Ma, existing within the Wapiti Fm.). These ages are somewhat younger than the diamondiferous kimberlites which exist at the Fort à la Corne area, Saskatchewan (age about 101 to 94 Ma), and age equivalent to somewhat older than those at the Lac de Gras region in the Slave Structural Province, N.W.T. (age about 74 to 52 Ma)."
What does this mean?? Good question! Just offering it for discussion!
Further from that APEX paper, for information purposes:
victoryventures.com
"Present within the Phanerozoic succession there is evidence for at least four episodes of volcanism or kimberlitic activity or both, which from oldest to youngest are: (a) uppermost Devonian (Exshaw Fm. bentonites - about 360 Ma); (2) mid Cretaceous (Viking and Shaftesbury bentonites, Crowsnest Volcanics, and Buffalo Head Hills kimberlites - ranging from about 100 to 85 Ma); (3) late Cretaceous (Horseshoe Canyon, Belly River and Kneehills Tuff bentonites, and the Mountain Lake kimberlitic diatreme - ranging from about 80 to 65 Ma); and lastly (4) early Tertiary (Sweetgrass Intrusions - about 54 to 49 Ma)."
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I see Kenn. has spent $1.8million to date on this property. That should satisfy quite a lot of assessment expenditure requirements!
Regards,
-j
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