[meteorite-list] Feldspar minerals in the inclusions in earthly/lunar basalts

From: mafer_at_domafer.com <mafer_at_meteoritecentral.com>
Date: Thu Apr 22 10:06:15 2004
Message-ID: <01c501c287b8$753d9ea0$6401a8c0_at_vs.shawcable.net>

feldspars shouldn't unless they are breaking down and co2 is present-----
Original Message -----
From: Fred Olsen <debfred_at_worldnet.att.net>
To: <mafer_at_domafer.com>
Sent: Friday, November 08, 2002 10:05 PM
Subject: Re: [meteorite-list] Feldspar minerals in the inclusions in
earthly/lunar basalts


> maybe I missed something but what part of feldspar fizzes ? Regards,
Fred
> Olsen
> ----- Original Message -----
> From: <mafer_at_domafer.com>
> To: Robert Verish <bolidechaser_at_yahoo.com>
> Cc: <Meteorite-list_at_meteoritecentral.com>
> Sent: Friday, November 08, 2002 8:20 PM
> Subject: Re: [meteorite-list] Feldspar minerals in the inclusions in
> earthly/lunar basalts
>
>
> > Hi Bob
> > The most probable reason I can think of is that the feldspars that are
> found
> > in meteorites are not typically vary large. By that I mean in some
> fashion,
> > large enough to see with the unaided eye, while those found in
terrestrial
> > rock are, even when small, distinguishable by the eye. The fizz test is
> > equally scaled, and so what these labs are most likely saying is that if
> you
> > can see it fizz, then the crystals of feldspar are too large and or too
> > numberous to match the known concentrations of the same in meteoritic
> > materials. I may be wrong, but this is what I see in meteorites. I'm not
a
> > geo-chemist, just trying for my BA in Geology, but I hope this helps a
> > little.
> > Mark
> >
> >
> > ----- Original Message -----
> > From: Robert Verish <bolidechaser_at_yahoo.com>
> > To: <bsoerhei_at_online.no>
> > Cc: Meteorite-list Meteoritecentral
<meteorite-list_at_meteoritecentral.com>
> > Sent: Friday, November 08, 2002 5:17 PM
> > Subject: [meteorite-list] Feldspar minerals in the inclusions in
> > earthly/lunar basalts
> >
> >
> > > --------------- Original Message ---------------
> > > [meteorite-list] Feldspar minerals in the inclusions
> > > in earthly/lunar basalts
> > > Bjørn Sørheim bsoerhei_at_online.no
> > > Fri, 8 Nov 2002 17:22:40 +0100 (MET)
> > >
> > > Hello list,
> > >
> > > ++++SNIP!!++++
> > >
> > > But the question I have is concerning the feldspar
> > > inclusions.
> > > I wonder what span in %-values there is of Albite(Na)
> > > vs. Anorthite(Ca) in the plagioclase of these
> > > inclusions in the lunar basalts compared to earthly
> > > basalts?
> > > On the practical side (testing) - would a lunar
> > > basaltic feldspar inclusion fizzle in (cold)
> > > hydrocloric acid (HCl)?
> > > Would a (Vesta) eucrite inclusion have the same values
> > > as its lunar counterpart?
> > >
> > > Regards,
> > > Bjørn Sørheim
> > > -----------------------------
> > >
> > > Good Questions Bjørn,
> > >
> > > Regarding your basalt's Ca-rich plagioclase
> > > phenocrysts
> > > --
> > > I just had a specimen turned-down for formal analysis,
> > > because it failed the very same acid test that you
> > > described. My immediate question was, How do we know
> > > those aren't lunar anorthosite grains that have
> > > undergone a great deal of terrestrial weathering, and
> > > that have been altered to clays and calcium carbonate?
> > >
> > > I'm still waiting for an answer to that question.
> > >
> > > So, if there is a geochemist out there on the List
> > > that knows why an acid test fizzle is [always] a
> > > diagnostic contra-indication for a plag-bearing
> > > meteorite, would they please explain to me "why?".
> > >
> > > Bob V.
> > >
> > >
> > >
> > >
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Received on Sat 09 Nov 2002 01:23:01 AM PST