Hi Jerry,
CRE = Cosmic Ray Exposure age. An estimate of the time the rock has been in
space.
-Walter
________________________
----- Original Message -----
From: "Gerald Flaherty" <[EMAIL PROTECTED]>
To: "Walter Branch" <[EMAIL PROTECTED]>; "Meteorite List"
<meteorite-list@meteoritecentral.com>
Sent: Saturday, November 11, 2006 2:03 PM
Subject: Re: [meteorite-list] CRE ages of Nakhlites and NWA 998
Help! CRE age??
Jerry Flaherty
----- Original Message -----
From: "Walter Branch" <[EMAIL PROTECTED]>
To: "Meteorite List" <meteorite-list@meteoritecentral.com>
Sent: Saturday, November 11, 2006 3:15 AM
Subject: [meteorite-list] CRE ages of Nakhlites and NWA 998
Hello Everyone,
I have been studying nakhlites in general and martian meteorite NWA 998
in particular. This paper,
http://www-curator.jsc.nasa.gov/antmet/mmc/XXV_NWA998.pdf
quotes a CRE of 9.3 m.y. using 38Ar. This paper
http://www.lpi.usra.edu/meetings/lpsc2005/pdf/1137.pdf
quotes a CRE age of 9.4 m.y, again using 38Ar. However, the paper
further points out CRE ages using 3He and 21Ne are in better agreement
(12.2 and 11.7 m.y., respectively) and are in agreement with other
nakhlite CRE ages. The authors state, "All nakhlite CRE ages based on Ar
are significant (sic) younger than those based on He and Ne, an
unexplained characteristic also observed among some shergotite CRE ages."
Does anyone know why this is?
-Walter Branch
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