[meteorite-list] Re: Any evidence of sedimentary activity in SNC's?

From: La Mémoire de la Terre <info_at_meteoritecentral.com>
Date: Thu Apr 22 09:55:51 2004
Message-ID: <000901c1a511$1e31ece0$cd4db4d4_at_computer>

Hi all,

Nakhla and Lafayette contain a mix of clays from
surface aqueous alteration.
A paper will be published next week in EPSL on
NWA 817 aqueous alteration . That Nakhlite contains an homogenous clay
called smectite. Unless Nakhla and Lafayette this
phase is pure and is deuterium poor. The scientists (6 labs did work on it)
explain that fact by an alteration of the minerals by
primitive water from the mantle under 500 °C.
This alteration did occur on planet Mars, no other
rocks from hot deserts have ever shows such an alteration
in their olivines, even the worst altered DaG shergottite's
olivine are deuterium rich.
This is not an evidence of sedimentary activity in SNC
but a first step to understand the geology of mars.

sincerely,

Bruno & Carine
www.meteorite.fr



-----Message d'origine-----
De : meteorite-list-admin_at_meteoritecentral.com
[mailto:meteorite-list-admin_at_meteoritecentral.com]De la part de E.P.
Grondine
Envoyé : jeudi 24 janvier 2002 19:36
À : meteorite-list_at_meteoritecentral.com
Objet : [meteorite-list] Any evidence of sedimentary activity in SNC's?


Hi all -

While there are clays in some of them, (and certainly
some of you could easily tell me in how many of them,
and how much clay there is), is there any sign at all
of any sustained hydrological action? Any banding at
all? Any other sign?

EP



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Received on Thu 24 Jan 2002 02:55:43 PM PST