[meteorite-list] is it a meteorite

From: Alan Rubin <aerubin_at_meteoritecentral.com>
Date: Tue, 8 Apr 2014 14:58:17 -0700
Message-ID: <095201cf5375$a71c4300$f554c900$_at_ucla.edu>

The more general question is how we would distinguish a terrestrial
meteorite found on Earth 9as opposed to one found in the lunar regolith).
Unless it was an observed fall, the rock would have to have a fusion crust
for us to notice it in the first place. It would have been exposed to
cosmic rays (gauged by measuring its cosmogenic nuclides) and it should have
the isotopic compositions of terrestrial rocks. Presumably, the rock would
have been extensively shocked or completely melted for it to have been
launched off the Earth to begin with. Interestingly, some studies have
concluded that rocks blasted off of Mercury spend millions of years in
independent heliocentric orbits before accreting once again with Mercury.

Alan Rubin
Institute of Geophysics and Planetary Physics
University of California
3845 Slichter Hall
603 Charles Young Dr. E
Los Angeles, CA 90095-1567

office phone: 310-825-3202
fax: 310-206-3051
e-mail: aerubin at ucla.edu
website: http://cosmochemists.igpp.ucla.edu/Rubin.html

-----Original Message-----
From: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of Jim
Wooddell
Sent: Tuesday, April 8, 2014 2:53 PM
To: meteorite-list at meteoritecentral.com
Subject: Re: [meteorite-list] is it a meteorite

So, let's say there is one.....a chunk of hematite.

What tests could be performed to 1. Prove it was in Space. 2.
Originally from Earth. ???
Radionuclide?

Jim

-- 
Jim Wooddell
jim.wooddell at suddenlink.net
http://pages.suddenlink.net/chondrule/
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Received on Tue 08 Apr 2014 05:58:17 PM PDT