Thanks for setting me straight Juergen. I hate to admit it but it was the
work you published with Mike Rubenach that partially inspired me to do the
Robertson River exercise. Although the Robertson River Metamorphics appear
to be complex structurally, I would suggest that there are a couple of key
marker events that are significant and the others are less pervasively
represented. The sample spacing was made at a distance considered small
enough to get around the problems of miscorrelation, based on complexity of
deformation in the area. It would be interesting to see of Tim is still as
confident of his six-stage deformation history for the area.
To take your point about whether or not porphs need deformation to grow -
what do you do with contact metamorphic porphyblasts, particularly those
residing in a relatively structureless matrix. Is there a super-fine
microfracturing occurring in response to pluton emplacement etc (without
invoking the highly over-rated process of granite inflation)?
Brett
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