Help! CRE age??
Jerry Flaherty
----- Original Message -----
From: "Walter Branch" <[EMAIL PROTECTED]>
To: "Meteorite List" <[email protected]>
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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