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Cenozoic variations in the flux of interplanetary dust recorded by3He in a deep-sea sediment

Nature volume 376, pages 153–156 (1995)Cite this article

Abstract

HELIUM-S concentrations and 3He/4He ratios in modern pelagic sediments are known to be far in excess of terrestrial values as a result of micrometeorite fallout1–3. 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.

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  1. Division of Geological and Planetary Sciences, MS 170-25, California Institute of Technology, Pasadena, California, 91125, USA

    K. A. Farley

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  1. K. A. Farley
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Farley, K. Cenozoic variations in the flux of interplanetary dust recorded by3He in a deep-sea sediment. Nature 376, 153–156 (1995). https://doi.org/10.1038/376153a0

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