Microtektites, microkrystites, and spinels from a late Pliocene asteroid impact in the southern ocean

Details Microtektites, microkrystites, and spinels from a late Pliocene asteroid impact in the southern ocean Microtektites, microkrystites, and spinels from a late Pliocene asteroid impact in the southern ocean

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...251.1594m&link_type=abstract

Science (ISSN 0036-8075), vol. 251, March 29, 1991, p. 1594-1597. Lawrence Livermore National Laboratory-supported research.

Physics

41

Asteroids, Hypervelocity Impact, Pacific Ocean, Spinel, Tektites, Cretaceous-Tertiary Boundary, Southern Hemisphere, Spherules, Earth, Microtektites, Impact Effects, Glass, Spherules, Comparisons, Samples, Terrestrial, Melts, Silicate, Spinel, Inclusions, Origin, Formation, Cretaceous-Tertiary Event, Ejecta, Chemistry, Sediments, Asteroids, Laboratory Studies, Electron Microscopy, Microprobe Methods, Sem, Procedure, Neutron Activation Analysis, Trace Elements, Morphology

Scientific paper

The properties of glassy spherules found in sedimentary deposits of a late Pliocene asteroid impact into the southeast Pacific are similar to those of both microtektites and microkrystites. These spherules probably formed from molten silicate droplets that condensed from an impact-generated vapor cloud. The spherules contain inclusions of magnesioferrite spinels similar to those in spherules found at the Cretaceous-Tertiary boundary, indicating that both sets of spherules are impact debris formed under similar physical and chemical conditions.

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