[meteorite-list] Dayton, Ohio Meteorite (?)

[bernd.pauli at paulinet.de]

Mike G. wrote:

"Dayton is the *weirdest* one of its group," McCoy said.
"Again, that makes it special and the reason scientists
want to study it."

Here are some of those weird things:

1. It's a member of the silicate-bearing IIICD group: Carlton, Dayton, Maltahöhe
2. Ni content: Maltahöhe (10.7 wt% Ni), Carlton (13.0%), Dayton (17.0% !)
3. Dayton contains SiO2 (!)
4. Graphite is absent in Dayton silicate inclusions
5. Unusual phosphates brianite and panethite, along with
   whitlockite, comprising up to 55 vol% of Dayton's inclusions
6. Silicate inclusions in the Ni-rich IAB irons do not resemble
   the phosphate-rich, evolved-silicate assemblages in Dayton.

Reference:

McCOY T.J. et al. (1992) Genesis of IIICD iron meteorites: Evidence
from silicate inclusions (Meteoritics 27-3, 1992, A258).


Best wishes,

Bernd

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