[meteorite-list] shergottite NWA4925 formation age

From: Francesco Moser <cojack_at_meteoritecentral.com>
Date: Thu, 20 Sep 2012 21:16:39 +0200
Message-ID: <000f01cd9764$76d1b0f0$647512d0$_at_tiscali.it>

Hello!
I'm looking for the formation age of the martian shergottite NWA4925.

Here I find the ejection age (1.1Ma) and the terrestrial age (450ka):
http://www.imca.cc/mars/martian-meteorites.htm


I have found also these pdfs with some information about 4925 and 6162:

http://www.lpi.usra.edu/meetings/lpsc2011/pdf/1610.pdf
http://www.lpi.usra.edu/meetings/lpsc2011/pdf/2371.pdf

"If NWA 4925 is similar in
age to other shergottites (~150-580 Ma), then its Nd isotopic ratio is
consistent with a long-term depleted source similar to that indicated for
SaU 005, NWA 1195, NWA 5789 and Yamato 980459."

Here I have find this plot:
http://www.imca.cc/mars/mars-img/img18-form-age-63.jpg

So I guess the formation age of NWA4925 is around 445-345Ma like SaU005 and
NWA1195, it's right?



Thank you a lot!

Francesco Moser
IMCA #1510
Received on Thu 20 Sep 2012 03:16:39 PM PDT