[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 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

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

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