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Re: Lake Murray
WBranchsb@aol.com schrieb:
> Hello Everyone,
>
> Could someone please supply me with some info on the Lake Murry Iron?
>
> First, is that the correct spelling?
> Date of find?
> Type of Iron?
>
> Thanks.
>
> -Walter
Lake Murray, IIB
Carter County, Oklahoma
USA
34° 06' N / 097° 00' W
Find, 1933
Known before this year
Recognized 1952
11.2kg, Albuquerque, Univ. of New Mexico. Half of the mass, Tucker Tower
Mus., Lake Murray State Park. 1.7kg, Tempe, Arizona State Univ. 80g,
Washington, U.S. Nat. Mus.
6.30 % Ni, 53.9 ppm. Ga, 141 ppm. Ge, 0.018 ppm. Ir
A 590lb mass with an iron-shale coating up to 6 inches thick was found
in a gully, L. LaPaz, Meteoritics, 1953, 1, p.109 (M.A. 12-359). The
mass found reported as 540kg, probably an error, B. Mason, Meteorites,
Wiley, 1962, p.240. Classification and analysis, 6.3% Ni, 53.9 ppm Ga,
141 ppm Ge, 0.018ppm Ir, J.T. Wasson, Meteorites, Springer-Verlag, 1974,
p.300. Description; cosmically reheated, V.F. Buchwald, Iron Meteorites,
Univ. of California, 1975, p.752.
SICREE A.A. et al. (1997) Potential for preservation and recovery of
fossil iron meteorites from coal, trona, limestone and other sedimentary
rocks (Meteoritics 32-4, 1997, A121):
... Lake Murray (Oklahoma), a IIB coarsest iron (10 mm) found in
Cretaceous sandstone and the oldest known 'paleoiron' [Ref.: LaPaz L.
(1953) Meteoritics 1, pp. 109-113].
Sicree et al. also report that "more than one dozen Ordovician
'paleochondrites' have been recovered from limestone quarries at Brunflo
and Österplana, Sweden". They are thoroughly altered and most of their
material has been replaced by barite and calcite. [Ref.: Thorslund P. et
al. (1981) NATURE 289, pp. 285-286 and Nyström J.O. et al. (1989) NATURE
336, pp. 572-574].
Best wishes, Bernd
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