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Planar defects as Ar traps in trioctahedral micas: A mechanism for increased Ar retentivity in phlogopite

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]

CollectionsANU Research Publications
Date published: 2012
Type: Journal article
Source: Earth and Planetary Science Letters
DOI: 10.1016/j.epsl.2012.05.041


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