Camacho, Alfredo; Lee, James K W; Fitz Gerald, John; Zhao, J.; Abdu, Y.A.; Jenkins, D.M.; Hawthorne, F.C.; Kyser, Thomas K; Creaser, Robert A.; Armstrong, Richard; Heaman, Larry
The effects of planar defects and composition on Ar mobility in trioctahedral micas have been investigated in samples from a small marble outcrop (~500m 2) in the Frontenac Terrane, Grenville Province, Ontario. These micas crystallized during amphibolite-facies metamorphism at ~1170Ma and experienced a thermal pulse ~100Ma later at shallow crustal levels associated with the emplacement of plutons. 87Rb/ 86Sr ages of the phlogopites range from ~950 to ~1050Ma, consistent with resetting during...[Show more]
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