Re-2: [meteorite-list] Mercurian origin of NWA 011

From: j.divelbiss_at_att.net <j.divelbiss_at_meteoritecentral.com>
Date: Thu Aug 19 21:50:33 2004
Message-ID: <082020040147.2482.4125581C0007A4EC000009B221603763169C9C070D040A90070BD206_at_att.net>

Bernd,

Thanx for the response in clearing up density as a possible factor(or not) for Mercurian origin of NWA 011.

Dr Rubin has been kind enough to straighten me out in the past too. Resources like Rubin, Matson, Weir, Verish, Pauli and others are quite valuable to us all on this list. Your temporary loss of mean density rationale in no way reduces the value we get with any of your posts.

As always...thanx for your input and effort.

John


-------------- Original message from bernd.pauli_at_paulinet.de: --------------

> > Help me out here...I thought mean density(of 5 or so) meant
> > that the average for the body included the core. And that Earth
> > was about 5 also with the surface around 3 and the core around
> > 7 or 8....with a lot of 5 rocks in between. Our basalts are also
> > in the 3.3 range are they not?
>
>
> Hello John and List,
>
> Of course, you are right and I stand corrected. A.E. Rubin, too, was kind
> enough to direct my attention to my rash conclusion and in a private mail
> to me, he wrote:
>
> "Of course, the mean density of the planet Mercury with its enormous
> iron core is not the value expected for basalts that erupted on the
> planet's surface. Alan Rubin"
>
> But there is another problem that is not too far away from all this: the FeO
> content of NWA 011. According to Yamaguchi et al., NWA 011 is very rich
> in FeO and although Palme H. proposes that NWA 011 may be a fragment
> of Mercury, its high FeO content is problematic because this would point
> toward a parent body with a small metallic iron core whereas Mercury is
> believed to have a large iron core (See also A.E. Rubin's comment of an
> "e n o r m o u s iron core").
>
> References:
>
> BURBINE T.H. et al. (2002) Spectra of extremely reduced assemblages:
> Implications for Mercury (MAPS 37-9, 2002, pp. 1233-1244)
>
> PALME H. (2002) A new solar system basalt (Science 296, 271-273).
>
> YAMAGUCHI A. et al. (2001) Northwest Africa 011,
> A New Basaltic Meteorite (MAPS 36-9, 2001, A228).
>
>
> Best regards,
>
> Bernd
>
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Received on Thu 19 Aug 2004 09:47:09 PM PDT