[meteorite-list] TISSINT EJECTION AGE MAY ONLY BE 5 YEARS!

[Graham Ensor]

Thanks for clarifying that Caroline....we were discussing it amongst
our group afterwards and wondered about it, as it did not tie in that
there could be possible pairings...I was hoping that someone would be
able to shed more light on it. We had a great afternoon yesterday at
the NHM thanks to everyone down there....much appreciated.

Graham

On Fri, Mar 30, 2012 at 2:03 PM, Caroline Smith
<caroline.smith at nhm.ac.uk> wrote:
> Hi All
>
> There seems to be some confusion. Here is a statement from our PhD
> student Natasha Stephen who met members of BIMS and briefly discussed
> Tissint with them.
>
> The Tissint Meteorite:
>
> Whilst analyses of live radionuclides 54Mn and 22Na in Tissint present
> young dates for dating the meteorite's FALL, (<5yrs), this analysis is
> still ongoing. The actual formation age is thought to be 450Ma, as per
> the original analysis and subsequent classification as a Martian
> Shergottite by the University of Washington and collaborators. Chemical
> and textural similarities with other olivine-phyric Shergottites have
> led to recent discussion that Tissint could have a possible launch
> pairing with samples such as DAG 476, SAU 005 or some of the NWA
> specimens, which would indicate an ejection age of ~1.1Ma. For further
> information, please see:
> http://www.lpi.usra.edu/meetings/lpsc2012/pdf/2510.pdf
>
>
> We are not saying that the ejection age is 5 years!
>
> I hope this clarifies things.
>
> Caroline Smith
>
> +++++++++++++++++++++++++++++++++++++++++++
> Dr Caroline Smith
> Curator of Meteorites and Aurora Fellow
> Department of Mineralogy
> The Natural History Museum
> Cromwell Road
> London
> SW7 5BD
> United Kingdom
>
> Tel: +44 (0)207 942 5709
> Mobile: +44 (0)7979 534278
> Fax: +44 (0)207 942 5537
> E-mail: C.L.Smith at nhm.ac.uk
> AND caroline.smith at esa.int
>
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> -----Original Message-----
> From: meteorite-list-bounces at meteoritecentral.com
> [mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of Graham
> Ensor
> Sent: 30 March 2012 11:29
> To: meteorite list
> Subject: [meteorite-list] TISSINT EJECTION AGE MAY ONLY BE 5 YEARS!
>
> Hi All,
>
> Spent a great day yesterday in London with 6 other BIMS members
> viewing the Lake House and Danebury meteorites at the Royal society
> and at the NHM viewing lots of goodies behind the scenes. One thing we
> were told is that there are indications through current research that
> Tissint may have been ejected from Mars a very short time
> ago....perhaps only 5 years ago....formation age around 500 million
> years.... anyone else heard anything along those lines?....quite
> something if it was still on Mars 5 years ago....even more of a thrill
> holding a sample.
>
> If anyone has seen a research paper or similar on this than please
> share.
>
> Graham
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