[meteorite-list] Fw: New Issue: Granite-like rocks on Vesta

[barrat at univ-brest.fr]

Hello,

HED meteorites contain often a silica phase... Anyway, the crust of Vesta is
commonly thought to be made of basalts (eucrites) and mafic or ultramafic
cumulates (diogenites and cumulate eucrites). We have studied a few howardites
and found impact glass beads. Some of these glasses are very rich in potassium
and one bead contains a remain of a silica-rich glass whose composition is
granitic-like. These observations indicate that the crust of Vesta contains
additionnal lithologies, possibly silica-rich and Potassium-rich similar in
composition to granitic rocks.

cheers,

Jean-Alix



Selon Pete Shugar <pshugar at clearwire.net>:

> I thought that the presence of Quartz was a good indication
> that the rock was not a meteorite !!!!!
> Now it seems that at least the 4 Vesta meteorites can have
> some Quartz in them?????
> Pete
> IMCA 1733
> ----- Original Message -----
> From: "Jerry Flaherty" <grf2 at verizon.net>
> To: <meteorite-list at meteoritecentral.com>
> Sent: Thursday, June 25, 2009 8:29 PM
> Subject: [meteorite-list] Fw: New Issue: Granite-like rocks on Vesta
>
>
> > List/Darren you had asked once about granite. I don't remember if was a
> > compositional or an origin issue.
> > I do know that granite's crystaline structure results from slow cooling
> > under monumental pressures [substantially 5 miles of overburden is a
> > commonly mentioned denominator-often referred to as "the roots of
> > mountains".
> > So what if anything does this tell us about Vesta's possible history?
> > Jerry Flaherty
> > ----- Original Message -----
> > From: "PSRD" <psrd at higp.hawaii.edu>
> > To: <PSRDMAIL at soest.hawaii.edu>
> > Sent: Thursday, June 25, 2009 5:03 PM
> > Subject: New Issue: Granite-like rocks on Vesta
> >
> >
> >> Announcement from Planetary Science Research Discoveries [PSRD] wedsite
> >>
> >> New article online: The Complicated Geologic History of Asteroid 4 Vesta
> >>
> >> -- Meteorites from asteroid 4 Vesta show that it contains patches of
> >> granite-like rock.
> >>
> >> ---------
> >> We invite you to:
> >> READ: First summary paragraph for a quick overview
> >> PRINT: pdf version
> >> VIEW: short slide summary
> >> ---------
> >> FULL ARTICLE at:
> >> http://www.psrd.hawaii.edu/June09/Vesta.granite-like.html
> >> ---------
> >>
> >> FIND ALL THE HEADLINE ARTICLES IN OUR ARCHIVES:
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> >> ---------
> >>
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> >> Hawaii Institute of Geophysics and Planetology,
> >> University of Hawaii
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