[meteorite-list] A contributary question for a change!

[mark ford]

Hi,

(I am back too by the way - Just couln't stay away!)


Yeah, I noticed on Dave's superb Etherville slice, that there where also
quite a few vesicles in the darker ?melt? pockets some of them quite big
bubbles, what are the implications for this? Does this mean it's just
odd impact melt or would you normally expect vesicles on a core-mantle
sample?? 

Mark Ford






-----Original Message-----
From: Dave Harris [mailto:entropydave at ntlworld.com] 
Sent: 04 May 2004 21:39
To: metlist
Subject: [meteorite-list] A contributary question for a change!

Hello,
My question is about mesosiderites and their composition.
I have just been reading the bit on mesos in Harry Mcsween's magnificent

Meteorites and their Parent Planets" . He states, and I quite, on pg
210-211:
" Many of the silicate fragments in these [mesosiderite]meteorites are
very
similar to eucrites, diogenites and howardites, basically igneous rocks
from
the crust of an achondrite body. What is noticeably missing from the
mesosiderites is olivine..."

Well, I have a 180+ thick slice of Estherville and I can assure you that
there are olivine xls present - you can shine a torch thru them!

So I would like to assume that a mesosiderite is not a core-mantle
sample
(like a Pallasite) but the smushed up surface of a well pounded
asteroid.

Any thought?s

sincerely!
Dave
IMCA #0092
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