[meteorite-list] Question about Norites - Lunar and Diogenite

From: Carl Agee <agee_at_meteoritecentral.com>
Date: Fri, 9 Jan 2015 11:47:09 -0700
Message-ID: <CADYrzhpeEaXH-nRSf3sgJcQLUJ5wSY-m63xDg88MyRbQwyCjEg_at_mail.gmail.com>

Hi Mike:

Norite is a generic petrologic term for an igneous mafic rock that has
primarily orthopyroxene + plagioclase and little or no clinopyroxene.
Norites occur on Earth, the Moon, and the HED parent body (as you call
Vestan). HED norites are in fact a type of diogenite. Geochemically
there is no way you can confuse a HED norite with a lunar norite. For
one thing they have totally different Fe/Mn, and of course the oxygen
isotopes are totally different.

Hope this helps.

Carl
*************************************
Carl B. Agee
Director and Curator, Institute of Meteoritics
Professor, Earth and Planetary Sciences
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126

Tel: (505) 750-7172
Fax: (505) 277-3577
Email: agee at unm.edu
http://meteorite.unm.edu/people/carl_agee/



On Thu, Jan 8, 2015 at 10:41 AM, Galactic Stone & Ironworks via
Meteorite-list <meteorite-list at meteoritecentral.com> wrote:
> Hi List,
>
> I was looking at Norites recently, and I came across the only
> lunar-origin Norite, the lunaite NWA 773. I had no knowledge of NWA
> 773 prior to stumbling across it's Noritic connection.
>
> The visual similarities between lunar norite and Vestan norite are
> apparent. I am assuming the major differences are noted in chemistry.
> Do lunar and Vestan norites share any other characteristics that might
> blur the line between their respective parent bodies? In other words,
> are these two types of norites so closely related that their may be
> some room for reconsideration when it comes to their parent body
> origins? (i.e., possible they came from the same body, or a noritic
> body impact on the parent, etc)
>
> Best regards,
>
> MikeG
>
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Received on Fri 09 Jan 2015 01:47:09 PM PST