[meteorite-list] Asteroidal origin of the NWA 011 "eucrite"

From: bernd.pauli_at_paulinet.de <bernd.pauli_at_meteoritecentral.com>
Date: Tue Oct 18 15:38:41 2005
Message-ID: <DIIE.0000002C00003E1B_at_paulinet.de>

On Sunday, Oct 16, Bernd wrote:

1. the HED parent body
2. the mesosiderite parent body
3. the angrite parent body
4. the NWA 011 parent body
5. the Ibitira parent body

As for the NWA 011 parent body, there is an article in MAPS
by C. Floss et al., and here is what the authors conclude:

The source material for NWA 011 may have been like some CH or CB
chondrites, members of the CR chondrite clan with similar oxygen
isotopic compositions. The NWA 011 parent body is probably of
asteroidal origin, possibly the basaltic asteroid 1459 Magnya*.

Reference:

FLOSS C. et al. (2005) NWA 011: A "eucritic" basalt from
a non-eucrite parent body (MAPS 40-3, 2005, pp. 343-360).

BINZEL R.P. et al. (2000) Evidence for a differentiated asteroid
beyond 3 AU from the sun (MAPS 35-5, 2000, Supplement, A026):

"... a rare basaltic asteroid beyond 3 AU from the Sun, a distance that appears
too great to allow any plausible relation to Vesta (at 2.36 AU) or any known
differentiated asteroid family. The 30-km (estimated size) asteroid 1459 Magnya
has high-quality visible and near-infrared spectral measurements that reveal the
characteristic signature of a basaltic surface. We believe that Magnya may be a
rare surviving fragment from a larger, differentiated planetesimal that was dis-
rupted long ago ..."


Cheers,

Bernd
Received on Tue 18 Oct 2005 03:38:37 PM PDT