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GEO-METAMORPHISM  December 2011

GEO-METAMORPHISM December 2011

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Subject:

Diamonds and the history of subducted slabs.

From:

Ben Harte <[log in to unmask]>

Reply-To:

Metamorphic Studies Group <[log in to unmask]>

Date:

Fri, 16 Dec 2011 12:52:12 +0000

Content-Type:

multipart/mixed

Parts/Attachments:

Parts/Attachments

text/plain (111 lines) , Harte&RichardsonPUBpdfv21(2012).pdf (111 lines) , Harte_ MinMagApril2010.pdf (111 lines)

Hi Bruce,
I've just had a paper published!
No particular cause for celebration you may well say - but I rather  
like this one, and it connects with 'metamorphism in the mantle',  
which I seem to remember we touched on rather late on the evening of  
Colin's retirement do.

The current paper (co-author Steve Richardson from Cape Town) is hard  
on the heels of a previous one (which strictly has most of the  
memorphism in it) and so I'm cluttering your mailbox by sending both.

The reason I like them is because they give diamonds with deep  
(>300kms) inclusions a place of origin and use them to trace the  
history of a subducted (stagnant) slab beneath western Gondawana in  
the Mesozoic.

Nice to talk with you a couple of weeks ago.
Have a good Christmas and happy New Year.

best wishes,

Ben

Quoting Bruce Yardley <[log in to unmask]> on Mon, 20 Jul 2009  
14:54:37 +0100:

> Dear Reia
>
> I think you should bear in mind that the sort of reactions that  
> produce garnet porphyroblasts with inclusions are invariably  
> devolatilisation reactions, and almost invariably dehydration  
> reactions. So it is very unlikely that fluid availability varies  
> significantly in different places unless the rock types and garnet  
> chemistry are really very different - the fluid pressure is close to  
> lithostatic and the permeability and "porosity" reflect the rate of  
> heat supply after the initial boost of nucleation (and are  
> inexorably coupled to the reaction rate). In my view, fluid  
> parameters in prograde metamorphism (as opposed to metasomatism) are  
> not normally independent variables but are constrained by  
> temperature, depth, salinity, rock composition and to some extent  
> heating rate.
>
> There are other factors which undoubtedly have a large impact on the  
> density of solid inclusions. Have you checked out Dugald  
> Carmichael's classic work on porphyroblasts in which he argued  
> (incorrectly!) that Al is immobile but illustrated very clearly that  
> a porphyroblast growing in a layer whose bulk composition is close  
> to that of the porphyroblast will contain fewer solid inclusions  
> than one growing in a layer with a more distinct composition? This  
> is most apparent when you look at quartz inclusions - see also for  
> example sample 91 (p.94) in my Atlas of Metamorphic Rocks in Thin  
> Section. But inclusion density can also vary between core and rim  
> suggesting a growth rate control, especially where the reaction  
> stoichiometry has changed through time.
>
> Bruce
>
>
> Professor Bruce Yardley
> School of Earth and Environment
> University of Leeds
> Leeds LS2 9JT, UK
>
> Tel: +44 (0)113 3435227
> Fax: +44 (0)113 3435259
> -----Original Message-----
> From: Metamorphic Studies Group  
> [mailto:[log in to unmask]] On Behalf Of Reia M.  
> Chmielowski
> Sent: 20 July 2009 11:06
> To: [log in to unmask]
> Subject: Re: fluids dictating mineral inclusion density in garnet?
>
> Hi Reiner,
>
> Thank you, but these seem to be on fluid inclusions. I am looking  
> for how fluids influence the presence or absence of mineral  
> inclusions in garnet (e.g. by acting as a "flux" to push other  
> minerals out of the way as garnet grows).
>
> Thanks,
>
> --Reia
>
> At 08:04 20/07/2009, you wrote:
>> Hi Reia,
>>
>> just check
>>
>> Vry & Brown, 1991, CMP, 108, 271-282.
>>  Whitney et al., 1996, JMG, 14, 163-181.
>> Kaindl & Abart,  2002, SMPM, 82, 467-486
>>
>> Cheers,   Reiner
>
>



Ben Harte (Prof)
Grant Institute of Earth Sciences,
School of GeoSciences, University of Edinburgh,
Edinburgh EH9 3JW.
Tel: [44] (0)131 651 7220; Fax: [44] (0)131 668 3184

-- 
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.


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