[meteorite-list] SNC's and their ages

From: Treiman, Allan <Treiman_at_meteoritecentral.com>
Date: Thu Apr 22 09:41:59 2004
Message-ID: <D144DC845882D311959900500424D7D0B1B9FE_at_cassnt2>

Here's a list of crystallization ages from magma.

    ALH84001 - 4.50 billion years (Rb-Sr, Sm-Nd)

    Nakhla, Lafayette, Governador Valadares, Chassigny
       1.3 billion years (K-Ar, Rb-Sr, Sm-Nd, U-Th-Pb)

    DAG 476 - 474 million years (Sm-Nd)

     QUE94201 - 327 million years (Rb-Sr, Sm-Nd)

     Shergotty, Zagami, EETA79001, ALHA77005, LEW88516, Y793605, Los Angeles

              _at_ 180 million years (~160 - 200 m.y.)
             (mostly Sm-Nd and U-Th-Pb, but the isotope systems are pretty
messed up)
    
   I could not find crystallization ages for the other DaG's, Dhofar , or
the SaU rocks.
Perhaps they will be available in the next few weeks from abstracts
submitted to the
32nd Lunar and Planetary Science Conference (look to
 <http://www.lpi.usra.edu/meetings/recentmeetings.html>).

   We've written a paper about why the SNC meteorites are thought to be from
Mars,
modestly titled "The SNC meteorites are from Mars" by Allan H. Treiman,
James D. Gleason,
Donald D. Bogard, in Planetary And Space Science 48 (2000) pp. 1213-1230. If
you'd
like a reprint, email your address and I'll send one when they arrive.

    Allan


Allan H. Treiman
Lunar and Planetary Institute
3600 Bay Area Boulevard
Houston, TX 77058-1113

281-486-2117
281-486-2162 FAX
treiman_at_lpi.usra.edu

> -----Original Message-----
> From: ari machiz [SMTP:a_machiz_at_yahoo.com]
> Sent: Thursday, January 11, 2001 5:47 PM
> To: meteorite-list_at_meteoritecentral.com
> Subject: [meteorite-list] SNC's and their ages
>
> Hi list. I have an easy one.
>
> A collegue at work wants to know how old our snc's
> are, and what dating methods we use. This is in an
> attempt to determine if he should believe that they
> are actually of Martian origin.
>
> Thanks for any responses.
>
> Ari
>
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Received on Fri 12 Jan 2001 09:18:16 AM PST