[meteorite-list] A Tektite Shower?

From: Bernd Pauli HD <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 09:54:04 2004
Message-ID: <3C6B9172.75A53412_at_lehrer1.rz.uni-karlsruhe.de>

"Sterling K. Webb" wrote:

> Footnote: There are anomalous Russian tektites that are not part of the "Big Four"
> tektite fields: 1.) three from Novy Urei with 80ppm water content and K-Ar and
> fission-track ages of 22-24 million years, and 2.) one from Magnitogorsk in the
> Urals with a K-Ar age of 6.3 million years.


Hello Sterling and List,

For those who would like to learn more about Sterling's footnote, see:

DEUTSCH A. et al. (1997) Geochemistry and neodymium-strontium
isotope signature of tektite-like objects from Siberia (urengoites,
South -Ural glass) (Meteoritics 32-5, 1997, 679):

The authors state that recent FTIR spectrometric investigations yielded
H2O contents between 0.008 and 0.024 wt% for three urengoites and
K-Ar and fission-track ages of 22-26 million years.

According to Koroteev et al. (1994), the H2O content of the South-Ural
glass amounts to << 0.09 wt% and a K-Ar age of about 6.2 Ma.

The parent crater of the urengoites should be
located somewhere in the eastern part of Siberia.

References:

KOMAROV A.M. et al. (1991) Fission-track dating of the Urengoy
tektites using an age standard (Geochem. Intern. 28, 11-17).

KOROTEEV V.A. et al. (1994) Tektite from Astaf Evskaja placer deposit,
Southern Urals (Zapisky Vseross. Mineral. Obsh. 123, 44-48, in Russian).


Best wishes,

Bernd
Received on Thu 14 Feb 2002 05:29:06 AM PST