Dear Colleagues,
To me a shear zone can be defined as a failure plane with a shear stress component associated with it.
Every fault, normal - strike-slip or reverse, is consequently a shear zone.
Ductile materials can support a shear component, whereas viscous materials cannot, but that does not mean that all shear zones are ductile fault zones.
Respectfully yours,
Dirk Nieuwland
Dr. D.A. Nieuwland
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On 28Jul, 2010, at 11:24 AM, Uwe Altenberger wrote:
> Dear John, dear Graham
> are these really shear zones? The classical and modern textbooks define shear zones as ductile fault zones. The anchimetamorphic zones are probable brittle faults? I know, it is only a semantic problem. However, younger scientists get be confused.
>
> best wishes
>
> uwe
>
>> Dear John
>> Have a look at what Bernard and I did with the Orlock Bridge Fault...it's all
>> anchizone........sorry I don't have a pdf
>>
>> Anderson, T B. & Oliver, G J H (1986). The Orlock Bridge Fault: a major Late
>> Caledonian sinistral fault in the Southern Uplands Terrane, British Isles.
>> Trans. R. Soc. Edin: Earth Sci. 77, 203-222.
>>
>> Cheers
>> Grahame (Still at the National University of Singapore and loving it)
>>
>> Quoting "John F. Dewey" <[log in to unmask]>:
>>
>>> Dear Colleagues,
>>>
>>> For some years, I have been working on the anchi-metamorphic shear
>>> zones of the North Cornwall/Devon coast between Crackington Haven and
>>> Hartland Quay. Rob Strachan got me going by, generously, giving me a
>>> sliced pebble through one of the finest shear zones of my experience
>>> from the beach at Hartland Quay. I have, now, analysed many large
>>> thin sections across these shear zones, which combine sigmoidal
>>> tension gashes with solution cleavages. Most are transtensional plane
>>> strain zones of volume increase. I would be most grateful to hear
>>> from anyone who has studied such shear zones.
>>>
>>> Best wishes,
>>> John Dewey
>>> --
>>>
>>> -----------------------------------
>>> Please update your address book to use [log in to unmask] as my
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>>>
>>> Prof. John F. Dewey FRS, Hon. M.R.I.A., Mem. Acad. Eur., For. Mem.
>>> US Nat. Acad. Sci, Distinguished Emeritus Professor University of California,
>>> Emeritus Professor University College Oxford.
>>>
>>> Sherwood Lodge,
>>> 93 Bagley Wood Road,
>>> Kennington,
>>> Oxford OX1 5NA,
>>> England, UK
>>>
>>> University College,
>>> High Street,
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>>>
>>> Telephone Nos:
>>> 011 44 (0)1865 735525 (home Oxford)
>>> 011 44 (0)1865 276792 (University College Oxford)
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>>>
>>
>>
>>
>>
>> ------------------------------------------------------------------
>> University of St Andrews Webmail: https://webmail.st-andrews.ac.uk
>
>
> --
> Uwe Altenberger
> Institute of Earth and Environmental Sciences
> University of Potsdam
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