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
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