[meteorite-list] Fwd: Peter's Stunning New Eucrite NWA 5230 paired with the Hupés' NWA 4883

From: Michael Fowler <mqfowler_at_meteoritecentral.com>
Date: Thu, 14 Aug 2008 15:51:20 -0500
Message-ID: <C6C7E1D7-B0DC-4A55-9779-8F1EC695C07D_at_mac.com>

Resent, don't think this went through the first time.

Mike


> http://www.marmet-meteorites.com/id41.html
>
> Peter writes:
>
> "It's NWA 5230, a maskelynite rich polymict eucrite breccia! Analized
> by Tony Irwing, who writes: We made a discovery of a small
> mesodiderite
> clast in it. This is an important observation that adds to the
> growing evidence
> for a common parent body for HEDDO and MESO meteorites! NWA 5230
> is paired with NWA 4883. TKW is 909 g."


I must disagree both with the above logic, and the rush to join the
mesosiderite and HED parent bodies.

As for the logic, I've never heard anyone say that finding a
carbonaceous clast in an L class meteorite means that the the two
parent bodies are related. It just means that at some point a
fragment of one parent body collided with another. If such clasts
were common, then one might infer that the two bodies at some point in
space and time were in relative proximity to each other.

As far as the meso's and HED's having a common parent body, that is
nearly impossible, especially if you believe that Vesta is the Parent
Body of the HED's. Consider that Vesta appears to be an intact body,
with a core, mantle and crust. The HED's sample different depths of
the crust. Where is there room for the Meso Parent Body? The MPB
(Meso Parent Body) was completely destroyed by the collision that
mixed the iron core with the basaltic crust.

Vesta is intact, the MPB has been destroyed. Therefore they can't be
the same Parent Body.

Mike Fowler
Chicago
Received on Thu 14 Aug 2008 04:51:20 PM PDT