[meteorite-list] Meteorite Parent Planet(s)

From: Walter Branch <branchw_at_meteoritecentral.com>
Date: Thu Apr 22 10:31:28 2004
Message-ID: <000101c3fbe5$8aea4f80$9e36dc44_at_wbranch>

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Hello Everyone,

Reading John Wasson's Disturbing the Solar System made me realize how =
often I have seen the phrase "the ___'s parent body (where ___ is =
whatever classification of meteorite one chooses). Wasson and others =
talk about asteroid parent bodies as if there was only one parent body =
for the mesosiderites, one for carbonaceous chondrites, one for the =
pallasites, etc. =20

I guess I always assumed that particles accreted early on such that any =
meteorite type formed in a number of planetesimals and what eventually =
came to be known as ___'s formed in many parent bodies.

I realize the meteorite specimens which fall to Earth are but chips from =
larger bodies which have undergone fragmentation due to collisions among =
these bodies, but I guess I had always assumed that there were any =
number of planetesimals from which the various types of meteorites =
originated.

What is the current thinking on this?
Was there a single ___ parent body?
Could x number of planetesimals have=20
occupied y distances from the sun and
thus been have exposed to different
degrees of thermal alteration by
solar radiation (ignoring radioactivity as
a heat source)?
Do all ___'s have one common ancestor?

-Walter
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www.branchmeteorites.com
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Hello Everyone,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Reading John Wasson's <U>Disturbing the =
Solar=20
System</U> made me realize how often I have seen the phrase "the ___'s =
parent=20
body (where ___ is whatever classification of meteorite one =
chooses).&nbsp;=20
Wasson and others talk about asteroid parent bodies as if there was only =
one=20
parent body for the mesosiderites, one for carbonaceous chondrites, one =
for the=20
pallasites, etc.&nbsp; </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>I guess I always assumed that=20
particles&nbsp;accreted early on such that any meteorite =
type&nbsp;formed in a=20
number of planetesimals and&nbsp;what eventually came to&nbsp;be known =
as ___'s=20
formed in&nbsp;many parent bodies.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>I realize the&nbsp;meteorite specimens =
which fall=20
to&nbsp;Earth are but chips from&nbsp;larger bodies which have undergone =

fragmentation due to collisions&nbsp;among these bodies, but I guess I =
had=20
always assumed that&nbsp;there were any number&nbsp;of planetesimals =
from which=20
the various types of meteorites originated.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>What is the current thinking on =
this?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Was there a single ___ parent =
body?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Could x number of planetesimals have =
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>occupied y distances from the sun =
and</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>thus been have exposed to =
different</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>degrees of thermal alteration =
by</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>solar radiation (ignoring radioactivity =

as</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>a heat source)?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Do all ___'s have one common =
ancestor?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>-Walter</FONT></DIV>
<DIV><FONT face=3DArial =
size=3D2>------------------------------------------<BR><A=20
href=3D"http://www.branchmeteorites.com">www.branchmeteorites.com</A></FO=
NT></DIV></BODY></HTML>

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Received on Wed 25 Feb 2004 01:02:46 PM PST


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