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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