[meteorite-list] Free Nickel-Iron In Lunar Breccias

From: meteorites_at_space.com <meteorites_at_meteoritecentral.com>
Date: Thu Apr 22 09:48:13 2004
Message-ID: <20011026070500.10257.cpmta_at_c000.snv.cp.net>

NWA 482 also has iron-nickel grains. I have a very nice thin section slide obtained from Michael Blood with a grain that can be clearly seen without the aid of a microscope. It is in a vein of impact glass.

Steve Schoner, AMS



On Thu, 25 October 2001, Bernd Pauli HD wrote:

>
> Mark Fox wrote:
>
> > With ... the long impact history of our scarred moon,
> > wouldn't it be possible for some malleable, nickel-iron
> > metal to be observed in lunar breccias from the impact
> > of an iron or nickel-iron rich meteorite?
>
>
> Hello Mark, Listees, and Listoids,
>
> According to the Met. Bull. 81, 1997, p. A159, the
> DaG 262 polymict anorthositic lunar highland breccia
> is said to contain metal particles (5-26 wt% Ni) wthin
> the fine-grained matrix of the breccia and within the
> shock veins.
>
> The accessory minerals of Dhofar 025, an anorthositic regolith
> breccia, are silica, Ti-rich alumochromite, troilite, and FeNi
> metal (Met.Bull. 84, 2000 August).
>
> The accessory minerals of Dhofar 026, an anorthositic crystalline
> melt breccia, are silica, ilmenite (MgO = 7 wt%), troilite, and
> FeNi metal (Met.Bull. 84, 2000 August).
>
> > ... has such an nickel-iron occurrence ever been recorded
> > in any of the moon rocks recovered during the Apollo or
> > Luna missions?
>
> The accessory minerals of Dhofar 081 (and Dhofar 280 - they
> are probably paired), a feldspathic fragmental (polymict clastic)
> breccia, are Fe-Ni metal, ilmenite, and Ti-Cr-rich spinel
> (Met.Bull. 85, Sep 2001).
>
> Dhofar 287, a low-Ti, olivine-pyroxene mare basalt
> breccia, also contains FeNi metal (Met.Bull. 85).
>
> BECKER R.H. et al. (1994) Solar Wind Noble Gases and Nitrogen
> in Metal from Lunar Soil 68501 (Meteoritics 29-5, 1994, 724):
>
> The authors describe spherical meteoritic metal grains, which
> are presumed to be droplets formed from impact-produced melts.
>
>
> Best wishes,
>
> Bernd
>
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Received on Fri 26 Oct 2001 03:05:00 AM PDT