[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> This is a multi-part message in MIME format. ------=_NextPart_000_006D_01C3FB9F.A99FCD60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 ------------------------------------------ www.branchmeteorites.com ------=_NextPart_000_006D_01C3FB9F.A99FCD60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2800.1276" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2>Hello Everyone,</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </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). =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. </FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>I guess I always assumed that=20 particles accreted early on such that any meteorite = type formed in a=20 number of planetesimals and what eventually came to be known = as ___'s=20 formed in many parent bodies.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>I realize the meteorite specimens = which fall=20 to Earth are but chips from larger bodies which have undergone = fragmentation due to collisions among these bodies, but I guess I = had=20 always assumed that there were any number of planetesimals = from which=20 the various types of meteorites originated.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </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> </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> ------=_NextPart_000_006D_01C3FB9F.A99FCD60-- Received on Wed 25 Feb 2004 01:02:46 PM PST |
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