Mathematics – Logic
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990metic..25...11z&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 25, March 1990, p. 11-17.
Mathematics
Logic
18
Earth Surface, Meteorites, Planetary Evolution, Chondrites, Fragments, New Mexico, Thermoluminescence, Earth, Meteorites, Fragments, Dating Methods, Thermoluminescence, Age, Terrestrial Age, Samples, Meteorite, Petrology, Laboratory Studies, Meteor Showers, Diagrams, Field Studies, Sampling, Ordinary Chonrites, Stony Meteorites, Ureilites, Howardites, Weathering, Strewn Fields, Photographs, Achondrites
Scientific paper
The discovery of 154 meteorite fragments within an 11-sq km area of wind-excavated basins in Roosevelt County, New Mexico, permits a new calculation of the accumulation rate of meteorite falls at the earth's surface. Thermoluminescence dating of the coversand unit comprising the prime recovery surface suggests the maximum terrestrial age of the meteorites to be about 16.0 ka. The 68 meteorite fragments subjected to petrological analyses represent a minimum of 49 individual falls. Collection bias has largely excluded carbonaceous chondrites and achondrites, requiring the accumulation rate derived from the recovered samples to be increased by a factor of 1.25. Terrestrial weathering destroying ordinary chondrites can be modeled as a first-order decay process with an estimated half-life of 3.5 + or - 1.9 ka on the semiarid American High Plains. Having accounted for the age of the recovery surface, area of field searches, pairing of finds, collection bias and weathering half-life, an accumulation rate of 940 falls/a per 10 to the 6th sq km is calculated for falls greater than 10 g total mass. This figure exceeds the best-constrained previous estimate by more than an order of magnitude. One possible reason for this disparity may be the extraordinary length of the fall record preserved in the surficial geology of Roosevelt County. The high accumulation rate determined for the past 16 ka may point to the existence of periods when the meteorite fall rate was significantly greater than at present.
Rendell Helen M.
Wells Gordon L.
Zolensky Michael E.
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