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GEO-METAMORPHISM  2003

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Subject:

Re: skarn

From:

Eric Essene <[log in to unmask]>

Reply-To:

Metamorphic Studies Group <[log in to unmask]>

Date:

Sun, 6 Jul 2003 12:51:00 -0400

Content-Type:

text/plain

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Parts/Attachments

text/plain (151 lines)

Faranak,
     You should try running Holland & Powell after analyzing the
assemblages.  It is often best to get P from stratigraphy or frm
assemblages in adjacent metapelites.   Assemblage 1C is buffered on a
decarbonation reaction and also limited to low X(CO2) in the presence
of epidote group minerals.  Skarns however often have replacement
rather than equilibrium textures.  I doubt that quartz + brucite can
ever be at equilibrium.  How did you identify the brucite?
eric


>As a postgratuate student I am working on skarns in the contact of
>granodiorites in Central Iran with the following mineralogy in different
>location. Any idea about possible reactions and P-T-X conditions?
>Skarn location 1:
>A)Cholorite+Calcite+Quartz+Epidote
>B)Garnet+Vesuvianite+Quartz+Brucite+Calcite
>C)Garnet+Epidote(Zoisite+clino zoicite+Pistacite)+Pyroxene(Hedenbergite)
>+calcite+Quartz
>D)Cholorite+Actinolite+Quartz+Calcite
>Skarn location 2:
>A)Magnetite+Garnet+Brucite+calcite
>B)Spinel(very small)+calcite
>C)Cholorite+Brucite+Calcite+Garnet+Talk
>Skarn location 3:
>A)Garnet+Pyroxene(Diopside)+calcite+titanite
>B)Garnet+Wollastonite+Vesuvianite+Calcite
>C)Garnet+Diopside+Wollastonite+Calcite
>D)Garnet+Pistacite+Calcite+Plagioclase
>
>                 your scincerly
>
>
>
>                  F Frazdel
>
>
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