[meteorite-list] Angrites, Ureilites, and Venus

From: Steven Singletary <jumper_at_meteoritecentral.com>
Date: Thu Apr 22 09:49:01 2004
Message-ID: <200109171156.HAA07965_at_melbourne-city-street.mit.edu>

> I had proposed a theory(that apparently got little attention) that Ureilites
> may
> have originated from Venus...

If that were the case, we would expect to see the oxygen isotopic data spread
out along a line with slope of 1/2 on the three oxygen isotope plot. One of
the most puzzling aspects of the ureilites is that the oxygen isotopes fall
along a line with a slope of 1. That means they have undergone very little to
no fraction since they were pulled from the nebula. Because Venus is a
differentiated planet, the isotopes should have been fractionated. That's
one line of argument against venus as a ureilite parent body. I'm working on
two more lines now and I'll keep you updated.

Steven Singletary
Dept. Earth, Atmospheric, and Planetary Sciences
Cambridge, Ma., 02139

Blue Skies!!
Received on Mon 17 Sep 2001 07:58:09 AM PDT

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