Bibcode
Schuraytz, B. C.; Lindstrom, D. J.; Marin, L. E.; Martinez, R. R.; Mittlefehldt, D. W.; Sharpton, V. L.; Wentworth, S. J.
Bibliographical reference
Lunar and Planetary Science, volume 27, page 1157
Advertised on:
3
1996
Citations
0
Refereed citations
0
Description
We identified a ~4-micrometer-long, ~1 x 10^-10 g "nugget" of Ir metal
in a melt rock sample from the Chicxulub impact basin. This particle,
which consists of an aggregate of subhedral Ir metal grains surrounded
by a thin coating of silicate, was isolated in the course of our efforts
to better understand the partitioning of projectile material between
crater deposits and ejecta in large meteorite impact events. In addition
to confirming earlier reports of Ir in melt rock and melt breccia within
the K-T boundary source crater, the results of our search for physically
identifiable carriers of meteoritic components provide additional
evidence for extreme fractionation of siderophile elements and their
concentration in sparsely disseminated trace phases.