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GEO-METAMORPHISM  September 2011

GEO-METAMORPHISM September 2011

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Subject:

Re: Texture in olivine cumulate

From:

Oliver Plümper <[log in to unmask]>

Reply-To:

Metamorphic Studies Group <[log in to unmask]>

Date:

Sun, 18 Sep 2011 01:05:21 +0200

Content-Type:

text/plain

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text/plain (140 lines)

 Dear Trisrota,

 Ever heard about dissolution-precipitation as a mechanism for mineral 
 re-equilibration. See numerous papers by Putnis and coworkers on this 
 topic. Serpentinization is an essentially fluid-driven processes and 
 solid-state diffusion is thought to play a minor role during this 
 alteration.

 Oliver

-- 
 Oliver Plümper
 Centre for Physics of Geological Processes (PGP)
 University of Oslo
 Sem Selands vei 24
 NO-0316 Oslo
 Norway

 Phone (Office): +47 22 85 60 51
 www.fys.uio.no/pgp/
 http://www.uni-muenster.de/DELTA-MIN/students-postdocs/plumpero.html


 On Sat, 17 Sep 2011 22:52:37 +0530, Trisrota Chaudhuri 
 <[log in to unmask]> wrote:
> Thanks to all for enlightening me. only I wonder with my very small
> knowledge, why does this diffusion goes up to grain boundaries (needs
> a long way for the elements to travel simply by diffusion ), why not
> symplectites. I'll definitely go through the paper by Prof Evans, 
> hope
> I'll get more light on this.
>  Regards and thanks again to all.
> Trisrota
>
> On Sat, Sep 17, 2011 at 7:48 PM, Kees Linthout  wrote:
>
> Trisrota, John, Peter et al.:
>
>  I wonder if Cr in spinel of altered peridotite stems from olivine,
> which is not a Cr-loving silicate.
>
>  Kees L.
>
>   Op 17/09/2011 15:41, Robert Tracy schreef:
>
>   Trisrota, John, Peter et al.:
>
>  I believe the old term (and maybe current as well) among
> opaque-mineral folks is "ferrit-chromit", since this phase that John
> and Peter refers to is typically a magnetite - Cr-spinel solid
> solution.  I have commonly seen it as well in serpentinized
> ultramafic rocks, and sometimes it can even persist through the
> prograde metamorphic metamorphic process into amphibolite facies and
> possibly even beyond.
>
>  Bob T.
>
>  On Sep 17, 2011, at 5:10 AM, Clemens, JD, Prof  wrote:
>
>   Hi Trisrota,
>
>  This is an almost universal feature of rocks in which mafic minerals
> have been serpentinised or altered to talc. The cause is simple, as
> you suspect. The new magnesian hydrous minerals are unable to
> accomodate all the Fe released by the reaction of the olivine or
> pyroxene into their crystal lattices, at the conditions of 
> alteration.
> It thus expresses itself as magnetite-rich spinel oxide.
>
>  Cheers,
>  JC
>
>  John D. Clemens
>  Professor in Geology&  Exec. Head
>  Dept of Earth Sciences, University of Stellenbosch,
>  Private Bag X1, 7602 Matieland, South Africa
>  tel: +27 (0)21 808 3159       fax: +27 (0)21 808 3129
>  e-mail:[log in to unmask] [3]
>  web page:http://www.sun.ac.za/geo/people/clemens_e.htm [4]
>  ________________________________________
>  From: Metamorphic Studies Group [[log in to unmask] 
> [5]]
> On Behalf Of Trisrota Chaudhuri [[log in to unmask] [6]]
>  Sent: 17 September 2011 10:25
>  To:[log in to unmask] [7]
>  Subject: Texture in olivine cumulate
>
>  Dear all,
>  I'm getting a typical texture of olivine cumulate rocks in thin
> sections (photo attached), in which olivines are extremely altered
> into serpentine and/or talc. But the interesting thing is that every
> altered olivine grain has a thin rim of opaques along their grain
> boundaries. Is it possible that the olivine, due to alteration,
> released some extra Fe/Mg, which might not been needed to form the
> altered product, and hence concentrated along olivine grain
> boundaries? Or something else like grain boundary exsolution has 
> taken
> place? Please enlighten me.
>  Regards,
>
>  --
>  Trisrota Chaudhuri,
>  JRF of Indian Statistical Institute and Jadavpur University,
>  Kolkata, India.
>   Robert Tracy
>  Professor of Geosciences
>  Virginia Tech
>  Blacksburg VA 24061-0420
>  O: 540-231-5980
>  F: 540-231-3386
>
> --
> Trisrota Chaudhuri,
> JRF of Indian Statistical Institute and Jadavpur University,
> Kolkata, India.
>
>
>
> Links:
> ------
> [1] mailto:[log in to unmask]
> [2] mailto:[log in to unmask]
> [3] mailto:[log in to unmask]
> [4] http://www.sun.ac.za/geo/people/clemens_e.htm
> [5] mailto:[log in to unmask]
> [6] mailto:[log in to unmask]
> [7] mailto:[log in to unmask]

-- 
 Oliver Plümper
 Centre for Physics of Geological Processes (PGP)
 University of Oslo
 Sem Selands vei 24
 NO-0316 Oslo
 Norway

 Phone (Office): +47 22 85 60 51
 www.fys.uio.no/pgp/
 http://www.uni-muenster.de/DELTA-MIN/students-postdocs/plumpero.html

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