There are some more recent studies, but the work below nicely reinforces Christian's statement regarding coesite having to be included as coesite in general.
P–V–T relationships and mineral equilibria in inclusions in minerals
M Guiraud, R Powell 2006
Earth and Planetary Science Letters 244 (3-4), 683-694
Professor Richard White
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University of St Andrews
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Tel: +44 01334 464944
On 30/06/2022, 20:26, "Metamorphic Studies Group on behalf of chopin" <[log in to unmask] on behalf of [log in to unmask]> wrote:
Dear all,
one point should be clear: considering thermal expansion and
compressibility of quartz vs garnet, a quartz inclusion in garnet CANNOT
convert to coesite upon increasing P and T. Trapped as quartz, it
remains quartz, as examplified by UHP metapelitic garnets having quartz
inclusions in their core and coesite inclusions in their rim.
I do agree that garnet formation upon increasing P and T, especially at
low T, may be more substantial than stated in the initial message. Yet,
there is some truth in the concern expressed in that message: coesite
inclusions in garnet are seldom abundant; actually they are profuse only
in the Dora-Maira whiteschits, in pyrope crystals that formed, together
with coesite, from talc+kyanite (in a coesite matrix), therefore a case
where most of the garnet growth took place in the coesite field.
Kind regards
Christian
---
Christian Chopin [log in to unmask]
Laboratoire de Géologie
Ecole normale supérieure - CNRS UMR8538
24 rue Lhomond
75231 PARIS CEDEX 05
France
Le 2022-06-30 20:19, Bruce Yardley a écrit :
> Hi Martin, Pavel and all
> This is a very interesting observation. Even if some garnet does grow
> at ultra high-P it still would not account for coesite through the
> bulk of the garnet. My suggestion, for what it's worth, is that garnet
> may have recrystallised completely at ultra high-P so that the present
> grains contain both old garnet material and any new material generated
> at ultra high-P. We see this phenomenon in migmatite restites, where
> garnets can be texturally quite different from those formed before the
> onset of melting, still present at lower grade. I have also seen
> examples where plagioclase in pelites completely recrystallised into
> large porphyroblasts at the staurolite-out isograd, although the modal
> abundance only increased very slightly. In these cases,
> recrystallisation accompanies reactions that that involve a lot of the
> rock and release fluid or melt. Can you say whether the
> coesite-bearing garnet grains last formed while some other reaction
> was going on, even if it did not generate much new garnet? At UHP
> conditions alumiosilicates are much more soluble and this may make
> recrystallisation easier.
> Good wishes
> Bruce
>
> Bruce Yardley
> Emeritus Professor
> School of Earth and Environment
> University of Leeds
> Leeds LS2 9JT
> UK
> Tel: +44(0)7745 132560
>
> https://www.lakedistrictgeology.co.uk/
>
> -------------------------
>
> FROM: Metamorphic Studies Group <[log in to unmask]> on
> behalf of Pavel Pitra <[log in to unmask]>
> SENT: 30 June 2022 17:48
> TO: [log in to unmask] <[log in to unmask]>
> SUBJECT: Re: [geo-metamorphism] how do coesite inclusions end up in
> garnet?
>
> Hi Martin and all,
>
> I would tend to agree with Jarek that quartz inclusions may have
> difficulties to convert to coesite, in particular if the excursion to
> the coesite stability field is only of limited "extent" (both in time
> and PT terms).
>
> On the other hand, I would at least partly disagree with the statement
>
> that "For a wide range of bulk compositions, mineral equilibria
> modelling suggests garnet modes are generally quasi invariant above
> about 2.4 GPa for a range of rocks types".
>
> This is true for eclogite-facies conditions (at least for metabasic
> rocks). However, at lower temperatures garnet can definitely grow with
>
> increasing temperature, in particular in the lawsonite stability field
>
> (both in metapelitic and metabasic rocks), and even more so close to
> the
> upper T limit of lawsonite. This is nicely shown in Fig. 10 of Paola
> Manzotti's recent paper on a new, cold, coesite-bearing unit in the
> Dora-Maira massif
> (https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoi.org%2F10.1007%2Fs00410-022-01923-8&data=05%7C01%7CB.W.D.Yardley%40leeds.ac.uk%7Ce1d0b185a7a4466f146f08da5ab881f3%7Cbdeaeda8c81d45ce863e5232a535b7cb%7C1%7C0%7C637922045749071871%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=PUWEOs2qLqoVInSpgmct6X%2BQMbS7%2FLD0XmONv8FcvLk%3D&reserved=0).
>
> So I believe the PT path of the rocks can play an important role, and
> perhaps at least some of the coesite-bearing rocks went through the
> HP-LT conditions before the eclogite-facies peak. (That's why looking
> at
> the prograde PT paths is so important)
>
> Cheers,
>
> Pavel
>
> On 30/06/2022 18:02, Jaroslaw Majka wrote:
>> Hi Martin,
>>
>> To follow up, I would ask even more straightforward (provocative?)
>> question, namely whether quartz actually ever converts into coesite
> if
>> captured at low P or no?
>>
>> My observations from various UHP rocks and some reading I have done
>> suggest that coesite should/would be a newly formed phase rather
> than a
>> pseudopmorph.
>>
>> Best,
>> Jarek
>>
>> Sent from my iPhone
>>
>>> On 30 Jun 2022, at 17:46, Martin Hand <[log in to unmask]>
> wrote:
>>>
>>>
>>>
>>> Hi folks,
>>>
>>> I’d be interested in your collective thoughts about coesite
> inclusions
>>> in garnet.
>>>
>>> For a wide range of bulk compositions, mineral equilibria modelling
>
>>> suggests garnet modes are generally quasi invariant above about 2.4
>
>>> GPa for a range of rocks types. Therefore in general, garnet
>>> shouldn’t be able to capture coesite in an equilibrium system..
>>>
>>> So unless garnet nuceation is radically overstepped, the presence
> of
>>> coesite in garnet means captured quartz had to convert to coesite
>>> after inclusion in garnet (?).
>>>
>>> If quartz inclusions in garnet convert to coesite, presumably
> garnet
>>> needs to deform (contract) to accommodate the c. 10% quartz to
> coesite
>>> volume change. So maybe(?) some of the ubiquitous fractures in
> high-P
>>> garnets are prograde strains.
>>>
>>> However looking in places like the Western Gneiss Complex, it seems
>
>>> that only an extremely small fraction of quartz inclusions in
> garnet
>>> converted to coesite (based on the prevalence of quartz inclusions
>>> that show no microstructural evidence they were ever coesite).
>>>
>>> I guess a caveat to the bracketed statement is that coesite to
> quartz
>>> microstructures and their garnet host may have annealed, obscuring
> the
>>> former presence of abundant coesite. However the apparent paucity
> of
>>> evidence for coesite in the WGC (for example) seems logical,
> because
>>> the garnet load forms well down-P of coesite-in.
>>>
>>> Some papers demonstrate quartz in garnet can metastably persist
> above
>>> coesite-in. Perhaps this is generally the case and conversion of
>>> quartz inclusions in garnet to coesite is the exception rather than
>
>>> the rule.
>>>
>>> I’m interested in what people think.
>>>
>>> martin
>>>
>>> Martin Hand
>>>
>>> Department of Earth Sciences
>>>
>>> University of Adelaide
>>>
>>> Phone: +61 (0)419 314 306
>>>
>>>
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