From: Bernd Pauli HD <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 09:48:14 2004
> (hoba) is between 200 and 400 million years and
> it fell on Earth approximately 80 000 years ago.
> 200-400 Ma seems "young" for an iron! Is this valid?
Hello Matt and List!
BUCHWALD V.F. (1975) Handbook
of Iron Meteorites, Volume 2, p. 648:
a) Bauer (1963) measured the 3He/4He concentration and
estimated the cosmic ray exposure age to be 190 million
b) Voshage (1967) found the 40K/41K ratio to correspond to
300±110 million years., while Lämmerzahl & Zähringer (1966)
found 1030±300 million years by the 40A/38A method, a
method which apparently here is somewhat in error.
c) McCorkell et al. (1968) found a 36Cl/36Ar exposure age of
263±40 million years.
Received on Tue 30 Oct 2001 06:39:56 PM PST