[meteorite-list] Ureilite 868

From: Joseph Hum <jkarlhum_at_meteoritecentral.com>
Date: Thu Apr 22 09:49:02 2004
Message-ID: <4120019622142621430_at_earthlink.net>

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Hi All,

 

New findings in a Ureilite

 

Ureilites containing diamonds were always thought to have been formed by
impact shock...

The features of Dag 868 seem to suggest that reconsiderations about the
origins and building

history of Ureilites are now necessary... The Ureilite contains fine
grained diamonds, but the

olivines appear to be Unshocked, showing no evidence of undulose
extinction- graphite found

in pigeonite crystals contain diamonds... It suggests that the diamonds
were not formed by

shock impact or chemical vapor disposition and raises major questions
about the accepted

petrogenesis/ history of Ureilites... Catalytic transformation??

 

H. Takeda, Chiba

M Ohtsuki, UTok

T. Nakamuta, KyuU

 

Best Regards,

J.Karl Hum

 

 

--- Joseph Hum

--- jkarlhum_at_earthlink.net

--- EarthLink: It's your Internet.

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<DIV></DIV>
<DIV>Hi All,</DIV>
<DIV>&nbsp;</DIV>
<DIV>New findings in a Ureilite&gt;</DIV>
<DIV>&nbsp;</DIV>
<DIV>Ureilites containing diamonds were always thought to have been formed by impact shock...</DIV>
<DIV>The features of Dag 868 seem to suggest that reconsiderations about the origins and building</DIV>
<DIV>history of Ureilites are now necessary... The Ureilite contains fine grained diamonds, but the</DIV>
<DIV>olivines appear to be Unshocked, showing&nbsp;no evidence of undulose extinction- graphite found</DIV>
<DIV>in pigeonite crystals contain diamonds... It suggests that the diamonds were not formed by</DIV>
<DIV>shock impact or chemical&nbsp;vapor disposition and raises major questions about the accepted</DIV>
<DIV>petrogenesis/ history of Ureilites... Catalytic transformation??</DIV>
<DIV>&nbsp;</DIV>
<DIV>H. Takeda, Chiba</DIV>
<DIV>M Ohtsuki, UTok</DIV>
<DIV>T. Nakamuta, KyuU</DIV>
<DIV>&nbsp;</DIV>
<DIV>Best Regards,</DIV>
<DIV>J.Karl Hum</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>--- Joseph Hum</DIV>
<DIV>--- <A href="mailto:jkarlhum_at_earthlink.net">jkarlhum@earthlink.net</A></DIV>
<DIV>--- EarthLink: It's your Internet.</DIV>
<DIV>&nbsp;</DIV>
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Received on Sat 22 Sep 2001 10:26:21 AM PDT


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