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Jochen I'll yank the chain a bit here and ask "What about foliation trend lines that may be able to be constructed from inclusion trails within porphyroblasts?". Some people have suggested that porphyroblasts have not rotated over immense distances along orogens. Cheers Brett Disclaimer: The views expressed above are not necessarily those of the writer. -----Original Message----- From: Jochen Mezger [SMTP:[log in to unmask]] Sent: Wednesday, 16 February 2000 0:01 To: [log in to unmask] Subject: Re: Foliation Hi Barry, Regarding your question if strike of regional foliation in metamorphic rocks can trace a former continental contact. I think this is certainly the case in younger orogenic belts where strike of regional foliation parallels that of the orogen (Northern NA Cordillera). And if you have other proof for a suture, such as isotope data, etc. But if you go into older terrains with multiple metamorphism and deformation, development of large strike-slip faults, shear zones, etc., you would need extra independent evidence. Regional trend of foliation alone in an Archaean schist would not convince me. Ciao, Jochen >How Now Everyone > >Does the strike of regional foliation in metamorphic rocks mimic past >continental contact? >-- >;-) >Barry Bowman *************************************************************************** Dr. Jochen Mezger Postdoctoral Fellow Johannes Gutenberg-University Mainz Tel.: 49-(0)6131-3924767 Institut fuer Geowissenschaften Fax.: 49-(0)6131-3923863 Tectonophysics Group Becherweg 21 Email: [log in to unmask] 55099 Mainz GERMANY ============================================================ "We're all recycled history machines, cavemen in faded blue jeans." Jimmy Buffett ************************************************************************ **** %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%