[meteorite-list] Contest mystery main mass
From: Adam Hupe <adamhupe_at_meteoritecentral.com>
Date: Thu Apr 22 10:08:28 2004 Message-ID: <012901c260d6$27ab49c0$f60ee70c_at_attbi.com> This is a multi-part message in MIME format. ------=_NextPart_000_0126_01C2609B.7AF0E440 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear List Members, We are finaly back from Denver, what a blast! We came back a day late = becuase we stopped in Delta Utah to hunt for triolibites on the way = back. After much thought we have decided the winners of the mystery = main mass specimens. In case you did not get the post from Martin = Horejsi, it is an "olivine diogenite". I know this term does not make = sense becuase by definition a diogenite is an orthopyroxenite yet this = is a formal classification. There are two or possible three listed in = the Antarctic collection. The jury is still out on EETA 79002 that has = one lithology that matches the criteria. =20 The provisional name for this meteorite is Northwest Africa 1459 which = was brought back by my brother Greg in April on an expedition to the = disputed zone betweeen Morocco and Algeria. This stone was purchased = directly from a nomadic group in the Iriqui area of Morocco. The = interior of the stone is dark yellow-green with orange staining, and the = exterior is coated by a thin fusion crust with protruding subhedral = chromite grains. This stone consist of subequal amounts of orthopyroxene = (Fs28Wo4.7 to Fs30Wo6.5, FeO/MnO =3D 28-32) and olivine (Fa36; FeO/MnO = =3D 46.5), large chromite grains, minor anorthite, clinopyroxene, = troilite, and Fe-metal (Ni-free). This unique and interesting sample is = a harzburgitic peridotite that appears to be related to the HED = meteorites from Vesta, although it is more olivine-rich and more Fe-rich = than other olivine diogenites. Alternatively, it might represent deep = crust or mantle material from another differentiated body. The = O-isotopes will finally address the question that begs to be answered = where the olivine diogenites originated. We should know in two to three = weeks. We selected what we felt where the ten closest answers, then assigned = entry numbers and drew from a hat. We decided to award four small = specimens instead of three. The reason for this is we felt Bernd Pauli = HD was the closest with his ungrouped diogenite answer along with = references to Antarctic specimens. No one else used the word diogenite = and if he would of simply added the word olivine he would have won so we = awarded him the first specimen. The other three were drawn from a group = of ten. Congratulations to the following: 1) Frank Cressy - harzburgitic peridotite=20 2) Andre Bordeleau - Stayed up all night trying to solve the problem and = had to work the next morning. This list member was entered for pure = effort which we respect. Some answers were very close also. 3) Martin Horejsi - harzburgitic peridotite - even though he announced = its classification for us while we were gone he was unaware of its = classification until we informed him from Denver. If you are listed above please send us your mailing address so that we = may send you a specimen. We want to congratulate everybody for all the fine entries. We decided = this was fun and educational so we will have similar contests in the = future. We are currently work on some other strange items so it should = not be long before we think up another contest.=20 Wishing everybody the very best, Adam and Greg Hupe The Hupe Collection IMCA 2185 ------=_NextPart_000_0126_01C2609B.7AF0E440 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 content=3D"text/html; charset=3Diso-8859-1" = http-equiv=3DContent-Type> <META content=3D"MSHTML 5.00.2919.6307" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2>Dear List Members,</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>We are finaly back from Denver, what a = blast! =20 We came back a day late becuase we stopped in Delta Utah to hunt for = triolibites=20 on the way back. After much thought we have decided the winners=20 of the mystery main mass specimens. In case you did not get = the post=20 from Martin Horejsi, it is an "olivine diogenite". I know this = term does=20 not make sense becuase by definition a diogenite is an orthopyroxenite = yet this=20 is a formal classification. There are two or possible three listed = in the=20 Antarctic collection. The jury is still out on EETA 79002 that has = one=20 lithology that matches the criteria. </FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>The provisional name for this meteorite = is=20 Northwest Africa 1459 which was brought back by my brother Greg in April = on an=20 expedition to the disputed zone betweeen Morocco and Algeria. This = stone=20 was purchased directly from a nomadic group in the Iriqui area of = Morocco. The=20 interior of the stone is dark yellow-green with orange staining, and the = exterior is coated by a thin fusion crust with protruding subhedral = chromite=20 grains. This stone consist of subequal amounts of orthopyroxene=20 (Fs<SUB>28</SUB>Wo<SUB>4.7</SUB> to Fs<SUB>30</SUB>Wo<SUB>6.5</SUB>, = FeO/MnO =3D=20 28-32) and olivine (Fa<SUB>36</SUB>; FeO/MnO =3D 46.5), large chromite = grains,=20 minor anorthite<FONT size=3D2>, clinopyroxene, troilite, and Fe-metal = (Ni-free).=20 </FONT>This unique and interesting sample is a harzburgitic peridotite = that=20 appears to be related to the HED meteorites from Vesta, although it is = more=20 olivine-rich and more Fe-rich than other olivine diogenites. =20 Alternatively, it might represent deep crust or mantle material from = another=20 differentiated body. The O-isotopes will finally address the = question that=20 begs to be answered where the olivine diogenites originated. We = should=20 know in two to three weeks.</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>We selected what we felt where the ten=20 closest answers, then assigned entry numbers and drew from a = hat. We=20 decided to award four small specimens instead of three. The reason = for=20 this is we felt Bernd Pauli HD was the closest with his = ungrouped=20 diogenite answer along with references to Antarctic specimens. No = one else=20 used the word diogenite and if he would of simply added the word olivine = he=20 would have won so we awarded him the first specimen. The other = three were=20 drawn from a group of ten. Congratulations to the = following:</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>1) Frank Cressy - harzburgitic = peridotite=20 </FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>2) Andre Bordeleau - Stayed up all = night trying=20 to solve the problem and had to work the next morning. This = list=20 member was entered for pure effort which we respect. Some answers = were=20 very close also.</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>3) Martin Horejsi - harzburgitic = peridotite - even=20 though he announced its classification for us while we were gone he was = unaware=20 of its classification until we informed him from Denver.</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>If you are listed above please send us = your mailing=20 address so that we may send you a specimen.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>We want to congratulate everybody for = all the fine=20 entries. We decided this was fun and educational so we will = have=20 similar contests in the future. We are currently work on some = other=20 strange items so it should not be long before we think up another=20 contest.</FONT> </DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Wishing everybody the very = best,</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>Adam and Greg Hupe</FONT></DIV> <DIV><FONT face=3DArial size=3D2>The Hupe Collection</FONT></DIV> <DIV><FONT face=3DArial size=3D2>IMCA 2185</FONT></DIV> <DIV> </DIV> <DIV> </DIV></BODY></HTML> ------=_NextPart_000_0126_01C2609B.7AF0E440-- Received on Fri 20 Sep 2002 02:47:21 PM PDT |
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