[meteorite-list] NWA 1058

[bernd.pauli at paulinet.de]

Hello Matteo and List,

> ... and why do A. Patzer, D.H. Hill, and W.V. BOYNTON in the
> Evolution and classification of acapulcoites and lodranites*
> say NWA 1058 is a acapulcoite?

Because its O-isotopes are more d16O-rich than typical:

18O = 3.57%, 17O = 1.33%

This oxygen isotopic ratio plots in the uppermost part of the
field of the acapulcoites/lodranites and not far away from the
IAB / Win field.

* PATZER A. et al. (2002) The evolution of acapulcoites and
lodranites: An INAA perspective (MAPS 37-7, 2002, A115).


Bernd