Mark,
As a follow-up to John Rosenfeld's remark concerning research by
glaciologists into particle fabrics within the subglacial (shear) zone,
there is indeed a great deal of literature. Two good first articles are:
Carr, S.J., Rose, J., 2003. Till fabric patterns and significance:
particle response to subglacial stress. Quaternary Science Reviews. 22,
1415-1426
Iverson, N.R., Hooyer, T.S., Thomason, J.F., Graesch, M., Shumway, J.R.,
2008. The experimental basis for interpreting particle and magnetic
fabrics of sheared till. Earth Surface Processes and Landforms. 33, 627-645
On the subject of clastic dykes in glacial environments (including
thin-section analyses):
van der Meer, J.J.M., Kjær, K.H., Kruger, J., Rabassa, J., Kilfeather,
A.A., 2009. Under pressure: clastic dykes in glacial settings.
Quaternary Science Reviews. 28, 708-720
My PhD research investigated particle dispersal mechanisms within a
subglacial deforming soft sediment layer. Unfortunately I have still to
derive articles from it that would be of relevance to you. I have a
paper submitted to QSR that details the application of X-ray µCT to
(non-destructively) investigate the internal structure of subglacial
sediment samples, including fabrics (of particles >10µm). The initial
results were disappointing, but the technology has moved on considerably
and there is significant potential in the technique. It's certainly a
topic that I would like to develop further.
--
Dr Mark Tarplee,
Department of Geography,
Queen Mary, University of London,
Mile End Road,
London
E1 4NS
Tel: 0044 (0)20 7882 2777
Fax: 0044 (0)20 8981 6276
http://www.geog.qmul.ac.uk/staff/tarpleem.html
"Every time I learn something new, it pushes some old stuff out of my
brain!" (Homer Simpson)
John Rosenfeld wrote:
> Mark,
>
> I addressed this question as it applies to schistosity in:
>
> Rosenfeld, J. L. (1985). Chapter 21:_/ Schistosity/_/ / in/ Preferred
> Orientation in Deformed Metals and Rocks: An Introduction to Modern
> Texture Analysis/. H.-R. Wenk, ed., Orlando, Academic Press, Inc.: 441-461.
>
> Literature on the subject goes back well into the Nineteenth Century.
> The great Irish physicist, Tyndall, thought the process was like that
> accounting for the flaky crust of/ croissants!/ as I recall. A paper by
> G.B. Jeffery in 1923 put the subject on a sounder basis. Appropriate
> references may be found in my paper. I believe the preferred orientation
> of hornblendes parallel to dike walls is not uncommon although I can't
> recall an example off-hand. There may also be examples recorded by
> glaciologists for elongate clasts along the borders of glaciers.
>
> John
>
> John L. Rosenfeld
> Professor of Geology, Emeritus
> Phone: (310) 825-1505 ofc
> Department of Earth and Space Sciences
> University of California
> Los Angeles, CA 90095-1567(04)
> <http://www.ess.ucla.edu/faculty/rosenfeld/index.asp>
>
>> I'm looking for research that constrains the orientation of tabular or
>> acicular, rigid particles that are contained in a shearing, viscous
>> matrix. I'm particularly interested in applying this to interpret the
>> observed orientation of clay particles in clastic dikes. The basic
>> question is whether there should be a preferred orientation of rigid
>> particles embedded in a viscous fluid that is flowing in a
>> parallel-sided channel (e.g., a dike). It seems like there should be
>> some research on this, particularly that related to interpreting AMS
>> in igneous dikes, but I can't find anything that address this question
>> from a theoretical or experimental standpoint.
>>
>> Suggestions, comments and references would be welcome.
>> --Mark
>>
>>
>> Professor Mark P. Fischer, Ph.D.
>> Dept. of Geology & Environmental Geosciences
>> Northern Illinois University
>> DeKalb, IL 60115-2854, USA
>> Phone: 815.753.7939
>> FAX: 815.753.1945
>> E-mail: [log in to unmask]
>>
>> --
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