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Cenozoic variations in the flux of interplanetary dust recorded by ^3He in a deep-sea sediment

Farley, K. A. (1995) Cenozoic variations in the flux of interplanetary dust recorded by ^3He in a deep-sea sediment. Nature, 376 (6536). pp. 153-156. ISSN 0028-0836. https://resolver.caltech.edu/CaltechAUTHORS:20130419-081334817

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Abstract

Helium-3 concentrations and ^3He/^4He ratios in modern pelagic sediments are known to be far in excess of terrestrial values as a result of micrometeorite fallout. Here I report that extraterrestrial helium is easily detected in a pelagic clay core dating back more than 70 Myr. The remarkable preservation of the extraterrestrial signature arises from high retention of ^3He within interplanetary dust particles, coupled with loss of radiogenic ^4He from terrestrial mineral grains. The core provides a continuous record of the fallout of extraterrestrial helium for the Cenozoic era. This record suggests that there have been significant variations in the influx of interplanetary dust through time, probably related to asteroidal breakup events or the passage of comets through the inner Solar System. The results also show ^3He to be a far more sensitive tracer of the interplanetary dust flux than is iridium.


Item Type:Article
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URLURL TypeDescription
http://dx.doi.org/10.1038/376153a0DOIUNSPECIFIED
http://www.nature.com/nature/journal/v376/n6536/abs/376153a0.htmlPublisherUNSPECIFIED
ORCID:
AuthorORCID
Farley, K. A.0000-0002-7846-7546
Additional Information:© 1995 Nature Publishing Group. Received 15 March; accepted 9 June 1995. I thank F. Kyte, K. Turekian and B. J. Pegram for helpful comments and for supplying samples, and G. J. Flynn for a helpful review. This work was supported by the Ocean Sciences Division of the US National Science Foundation.
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Funding AgencyGrant Number
NSF Ocean Sciences DivisionUNSPECIFIED
Issue or Number:6536
Record Number:CaltechAUTHORS:20130419-081334817
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130419-081334817
Official Citation:Cenozoic variations in the flux of interplanetary dust recorded by3He in a deep-sea sediment 153 K. A. Farley doi:10.1038/376153a0
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38030
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:19 Apr 2013 20:46
Last Modified:03 Mar 2020 13:01

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