[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> ------=_NextPart_84815C5ABAF209EF376268C8 Content-type: text/plain; charset=US-ASCII 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. ------=_NextPart_84815C5ABAF209EF376268C8 Content-Type: text/html; charset=US-ASCII <HTML><HEAD> <META content="text/html; charset=windows-1251" http-equiv=Content-Type> <META content="MSHTML 5.00.3211.1700" name=GENERATOR></HEAD> <BODY> <P> <DIV></DIV> <DIV>Hi All,</DIV> <DIV> </DIV> <DIV>New findings in a Ureilite></DIV> <DIV> </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 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 vapor disposition and raises major questions about the accepted</DIV> <DIV>petrogenesis/ history of Ureilites... Catalytic transformation??</DIV> <DIV> </DIV> <DIV>H. Takeda, Chiba</DIV> <DIV>M Ohtsuki, UTok</DIV> <DIV>T. Nakamuta, KyuU</DIV> <DIV> </DIV> <DIV>Best Regards,</DIV> <DIV>J.Karl Hum</DIV> <DIV> </DIV> <DIV> </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> </DIV> <P></P></BODY></HTML> ------=_NextPart_84815C5ABAF209EF376268C8-- Received on Sat 22 Sep 2001 10:26:21 AM PDT |
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