Computer Science
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.300..217s&link_type=abstract
Nature, vol. 300, Nov. 18, 1982, p. 217, 218.
Computer Science
2
Earth Surface, Impact Damage, Planetary Craters, Tektites, Comets, Europe, Ivory Coast, Meteoritic Damage, North America, Radioactive Age Determination
Scientific paper
Recent evidence for the origin of tektites in cometary or meteoritic impacts with the earth's surface is discussed. Attention is given to the work of Shaw and Wasserburg (1982), in which it is shown that the measured deviation of the Nd-143/Nd-144 ratio from the present-day chondritic value is always negative for tektites representative of all four known strewn fields, while that of the Sr-87/Sr-86 ratio is always positive and large, as in old terrestrial continental crust. It was also noted that within each tektite group, the Nd ratio deviations were uniform, whereas Sr-ratio deviations were highly variable, in accordance with the sensitivity of the Rb-Sr system to sedimentation, volatilization, wethering and diagenesis effects after the laying down of Precambrian crustal material. Potential parent craters with sediment isotopic compositions similar to those of nearby tektite fields are identified for the European and Ivory Coast strewn fields, and possible impact origins of the North American and Australasian strewn fields are considered.
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