Hi Rob,
That link of yours didn't work it should have been;
http://earth.leeds.ac.uk/tectonics/alpine_tectonics/metamorphic/dating.htm
Steve..
-----Original Message-----
From: Tectonics & structural geology discussion list
[mailto:[log in to unmask]] On Behalf Of Rob Butler
Sent: 02 February 2005 12:39
To: [log in to unmask]
Subject: Radiometric dating of shear zone fabrics
Eldridge and others
There are some brief notes and references to the work we did here in Leeds,
dating shear zones, chiefly in the Alps, using Rb-Sr ages on white mica in
calc-schists. Almost all the work in the publications listed was done by
Steve Freeman. Personally I quite like the method because the dates apply
directly to minerals that form the deformation foliations (provided the
calcite and mica are recrystallising during the deformation and this this
went on significantly below closure) - so it's easier (although not with
potential pitfalls) to relate the geochron to the deformation.
The website is:
http://earth.leeds.ac.uk/tectonics/alpine_tectonics/metamorphic/dating/
htm.
Hope this rather dated dating is of interest Rob
On 1 Feb 2005, at 18:06, JISCmail list wrote:
> Dear Colleagues:
>
> I am interested in general references on the recent advances in
> radiometric dating of various minerals in shear zone fabrics. Does
> anyone know of any such references? I would greatly appreciate any
> ideas that you might have.
>
> Best regards,
>
> Eldridge
> --
> Distinguished Professor of Emeritus of Geology Vice President,
> International Union of Geological Sciences Department of Geology,
> University of California One Shields Avenue Davis, CA 95616
>
> Tel: 530-752-0352
> Fax: 530-752-0951
>
> "Civilization exists by geologic consent, subject to change without
> notice"
> "Civilization is an interval between ice ages"
> (Will Durant)
>
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