Computer Science
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.363..615r&link_type=abstract
Nature (ISSN 0028-0836), vol. 363, no. 6430, p. 615-617.
Computer Science
18
Earth, Cretaceous-Tertiary Event, Position (Location), Deposits, Shape, Spherules, Samples, Terrestrial, Laboratory Studies, Spinel, Morphology, Composition, Particles, Melting, Distribution, Impacts, Origin, Inaa, Source, Procedure, Microprobe Methods, Neutron Activation Analysis, Electron Microscopy, Iridium
Scientific paper
The spinel-bearing material recovered from K/T boundary deposits at site 577 in the Pacific Ocean has been examined, and two distinct populations of particles are found: spherules with dendritic spinel textures dispersed throughout the grains and irregularly shaped fragments with spinels essentially confined to the rim. The morphology and composition of the particles are characteristic of melted and partially melted meteoritic ablation debris, but their location is difficult to reconcile with an impact on the Yucatan peninsula, some 10,000 km away. It is suggested instead that the spinel-bearing particles at site 577 are derived from the impact of a 2-km asteroid in the Pacific Ocean, and that several accretionary events of this type are required to explain the local distribution of spinel-bearing spherules at the K/T boundary.
Froget Laurence
Jehanno Celestine
Robin Eric
Rocchia Robert
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