[meteorite-list] Mercurian Meteorites

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From: Matson, Robert <ROBERT.D.MATSON_at_meteoritecentral.com>
Date: Thu Apr 22 09:50:26 2004
Message-ID: <AF564D2B9D91D411B9FE00508BF1C86901B4E07F_at_US-Torrance.mail.saic.com>

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Hi Sterling and List,

> Originally posted last June (2001), the statistics of transfer of impact
ejecta from
> planet to planet suggested that there should be 1 or 2 Mercurian
meteorites that
> have been collected but not (then) identified. The ratio of Martian to
Mercurian
> meteorites should be about 15:1. Since basalt requires a differentiated
world,
> Vesta is about as small as a basalt producer is likely to be, so the
candidates
> for the origin of these rocks have to be bigger.

Coincidentally enough, I was talking to Alan Rubin just yesterday about what
a Mercurian (Hermian?) meteorite would look like. Among other things, he
said it would be low in metal and volatiles, highly shocked, and high in
solar
gases. (On the latter point, I thought, "Great! I'll just look for rocks
high in solar gasses! ;-)"

Cheers,
Rob

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<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=990085900-13042002>Hi
Sterling and List,</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=990085900-13042002></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=990085900-13042002>>
</SPAN></FONT>Originally posted last June (2001), the statistics of transfer of
impact ejecta from<SPAN class=990085900-13042002><FONT color=#0000ff face=Arial
size=2> </FONT></SPAN></DIV>
<DIV><SPAN class=990085900-13042002><FONT color=#0000ff face=Arial
size=2>></FONT> </SPAN> planet to planet suggested that there should be
1 or 2 Mercurian meteorites that<SPAN class=990085900-13042002><FONT
color=#0000ff face=Arial size=2> </FONT></SPAN></DIV>
<DIV><SPAN class=990085900-13042002><FONT color=#0000ff face=Arial
size=2>></FONT> </SPAN> have been collected but not (then) identified.
The ratio of Martian to Mercurian<SPAN class=990085900-13042002><FONT
color=#0000ff face=Arial size=2> </FONT></SPAN></DIV>
<DIV><SPAN class=990085900-13042002><FONT color=#0000ff face=Arial
size=2>></FONT> </SPAN> meteorites should be about 15:1. Since basalt
requires a differentiated world,<SPAN class=990085900-13042002><FONT
color=#0000ff face=Arial size=2> </FONT></SPAN></DIV>
<DIV><SPAN class=990085900-13042002><FONT color=#0000ff face=Arial
size=2>></FONT> </SPAN> Vesta is about as small as a basalt producer is
likely to be, so the candidates<SPAN class=990085900-13042002><FONT
color=#0000ff face=Arial size=2> </FONT></SPAN></DIV>
<DIV><SPAN class=990085900-13042002><FONT color=#0000ff face=Arial
size=2>></FONT> </SPAN> for the origin of these rocks have to be
bigger.<SPAN class=990085900-13042002><FONT color=#0000ff face=Arial
size=2> </FONT></SPAN></DIV>
<DIV><SPAN class=990085900-13042002></SPAN> </DIV>
<DIV><SPAN class=990085900-13042002><FONT color=#0000ff><FONT size=2><FONT
face=Arial>Coincidentally enough, I was talking to Alan Rubin just
yester</FONT><FONT face=Arial>day about what</FONT></FONT></FONT></SPAN></DIV>
<DIV><SPAN class=990085900-13042002><FONT color=#0000ff><FONT size=2><FONT
face=Arial>a Mercurian (</FONT><FONT face=Arial>Hermian?) meteorite would
l</FONT></FONT><FONT face=Arial size=2>ook like.  </FONT><FONT
face=Arial size=2>Among other things, he</FONT></FONT></SPAN></DIV>
<DIV><SPAN class=990085900-13042002><FONT color=#0000ff face=Arial size=2>said
it would be low in metal and volatiles, highly shocked, and high in
solar</FONT></SPAN></DIV>
<DIV><SPAN class=990085900-13042002><FONT color=#0000ff face=Arial
size=2>gases.  (On the latter point, I </FONT></SPAN><FONT size=2><FONT
color=#0000ff><FONT face=Arial><SPAN class=990085900-13042002>thought,
"Great!  I'll just look for rocks</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT size=2><FONT color=#0000ff><FONT face=Arial><SPAN
class=990085900-13042002>high in solar gasses! 
;-)"</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT size=2><FONT color=#0000ff><FONT face=Arial><SPAN
class=990085900-13042002></SPAN></FONT></FONT></FONT> </DIV>
<DIV><FONT size=2><FONT color=#0000ff><FONT face=Arial><SPAN
class=990085900-13042002>Cheers,</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT size=2><FONT color=#0000ff><FONT face=Arial><SPAN
class=990085900-13042002>Rob</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT size=2><FONT color=#0000ff><FONT face=Arial><SPAN
class=990085900-13042002></SPAN></FONT></FONT></FONT> </DIV>
<DIV><FONT size=2><FONT color=#0000ff><FONT face=Arial><SPAN
class=990085900-13042002></SPAN><BR> </DIV></FONT></FONT></FONT></BODY></HTML>

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Received on Fri 12 Apr 2002 09:01:48 PM PDT

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