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Deep-sea spherules from Pacific clay - Mass distribution and influx rateFrom 411 kg of Pacific clay, 22 mg of stony spherules and 50 mg of iron spherules larger than 150 microns were concentrated. The extraterrestrial origin of these particles was evaluated with the aid of optical and electron microscopy and atomic absorption elemental analysis. An expression for the integral number of stony particles from this sediment in the mass range 20-300 micrograms was derived. The world-wide influx rate of stony particles in the mass range which survive atmospheric heating and ocean sediment storage is calculated to be 90 tons/yr. The relative contributions of ablation debris vs fused interplanetary dust to the influx of stony spherules is discussed, but no conclusions could be made.
Document ID
19810031966
Document Type
Reprint (Version printed in journal)
Authors
Murrell, M. T. (California Univ. La Jolla, CA, United States)
Davis, P. A., Jr. (California Univ. La Jolla, CA, United States)
Nishiizumi, K. (California, University La Jolla, Calif., United States)
Millard, H. T., Jr. (U.S. Geological Survey Denver, Colo., United States)
Date Acquired
August 11, 2013
Publication Date
December 1, 1980
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 44
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NGL-05-009-148
CONTRACT_GRANT: NSG-7027
Distribution Limits
Public
Copyright
Other