I ran across this paper which mentions dendritic metal-sulfide
intergrowths in CR-clan meteorites, and I was wondering if this
is a common feature of impact melts/breccias, or is it an unusual
feature?
http://www.lpi.usra.edu/meetings/lpsc2000/pdf/1420.pdf
My database query only resulted in QUE 94411 and HaH 237 showing
such dentritic features, so my non-scientific conclusion would be
that it is an extraordinary phenomenon of *these* two metal-rich
stoney (!) meteorites unless such ferrous silicate shock melts
have not *yet* been detected in other stoney samples.
Ferrous silicate spherules have also been reported from CH carbonaceous
chondrites like Acfer 182 or ALH 85085, EET 96238, PAT 91546, PCA 91467,
RKP 92435.
References:
MEIBOM A. et al. (2000) An astrophysical model for the formation of zoned
iron-nickel metal grains in the Bencubbin/CH-like chondrites QUE 94411 and
HaH 237 (MAPS 35-5, 2000, Suppl., A107).
MEIBOM A. et al. (2000) Metal/sulfide-ferrous silicate shock melts in QUE 94411
and HaH 237: Remains of the missing matrix? (abs. Lunar Planet. Sci. 31, abstract
#1420, Lunar and Planetary Institute, Houston, Texas, USA, CD-ROM).
KROT A.N. et al. (2000) Ferrous silicate spherules with euhedral iron-nickel metal
grains from CH carbonaceous chondrites: Evidence for supercooling and condensation
under oxidizing conditions (MAPS 35-6, 2000, pp. 1249-1258).
Best regards,
Bernd
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