Computer Science
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991metic..26..203t&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 26, Sept. 1991, p. 203-211.
Computer Science
25
Geochronology, Interplanetary Dust, Ocean Bottom, Spherules, Chemical Composition, Meteoritic Microstructures, Olivine, Sediments, Textures
Scientific paper
Cosmic spherules obtained from the Greenland ice cap, deep-sea sediments, and ancient oceanic deposits of Eocene and Jurassic age were chemically and texturally compared. The proportions of spherule types were found to change as a function of time, with the number of iron spherules increasing as the age of the sample increased. It is not yet possible, however, to determine if the variation in spherule types represents a real change in the meteoroid complex or is a result of differential weathering of the spherules in the earth's environment. The age of these spherules ranges from less than 3000 years to about 190 million years. Although only a few sherules older than 500,000 years are chemically unaltered, textural information is available even from the oldest spherules and, by comparison with contemporary spherules, gives some insight into the original compositions of the particles.
Brownlee Donald E.
Taylor Susan
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