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 pshu...@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 g...@verizon.net
To: meteorite-list@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 p...@higp.hawaii.edu
To: psrdm...@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
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FULL ARTICLE at:
http://www.psrd.hawaii.edu/June09/Vesta.granite-like.html
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