[meteorite-list] Any Meteorites of Earth Origin?
From: Jeff Grossman <jgrossman_at_meteoritecentral.com>
Date: Thu Apr 22 09:47:10 2004
At 04:34 PM 11/11/2001, meteorites_at_space.com wrote:
>On Sun, 11 November 2001, Jeff Grossman wrote:
> > Alan Rubin and I wrote a definition of "meteorite" for Meteorite! a while
> > back that allowed for terrestrial meteorites. Our current thinking is
> > the object would have to have left Earth by natural processes
> > (impact-launching seems the only option, although this is highly
> > improbable), either by achieving escape velocity, or by insertion into
> > Earth orbit via some secondary change to its trajectory (we want to
> > eliminate material on ballistic paths that take it immediately back to
> > Earth, e.g., tektites). If such material later reaccretes to Earth or
> > accretes to another body (like the Moon or an asteroid), we would define
> > this as a terrestrial meteorite.
> > Of course, we already have terrestrial meteorites in our collections if
> > well-accepted theory of lunar formation is correct. But that's just
> > semantics. There is no evidence for more recent events on Earth producing
> > terrestrial meteorites.
> > jeff
>Tektites, the Australites in particular are "terrestrial meteorites."
What makes you say that?
Dr. Jeffrey N. Grossman phone: (703) 648-6184
US Geological Survey fax: (703) 648-6383
954 National Center
Reston, VA 20192, USA
Received on Sun 11 Nov 2001 07:26:47 PM PST