Computer Science
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998gecoa..62.3669p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 62, Issue 23-24, pp.3669-3682
Computer Science
15
Scientific paper
We have determined the helium abundance and isotopic composition of seafloor carbonate sediments from the flanks of the Ontong Java Plateau, western equatorial Pacific Ocean (ODP Site 806). These results provide a two million year record of the burial flux of extraterrestrial 3 He, which we believe is a proxy for the terrestrial accretion rate of interplanetary dust particles. The 3 He burial flux prior to ~700 ka was relatively low, ~0.5 pcc cm -2 kyr -1 , but from 700 ka to the present, the burial flux gradually increased to a value of ~1.0 pcc cm -2 kyr -1 . 100 kyr periodicity in the 3 He burial flux is apparent over the last 700 kyr and correlates with the oxygen isotope record of global climate, with high 3 He burial fluxes associated with interglacial periods. This periodicity and phase are consistent with previous 3 He measurements in North Atlantic sediments. Although 100 kyr periodicity in 3 He burial flux is in agreement with recent predictions of the accretion rate of interplanetary dust based on a model of the orbital evolution of asteroidal debris, the measurements and predictions differ by one half cycle in phase. Nevertheless, our observations suggest the terrestrial accretion rate of interplanetary dust is controlled by orbital eccentricity and/or inclination relative to the solar-system invariable plane. Such control is a necessary but not sufficient condition for the hypothesis of that variations in extraterrestrial dust accretion modulates terrestrial climate with a 100 kyr period. We also identify several brief (<25 kyr) intervals of strongly enhanced 3 He burial, possibly related to random and transient fluctuations in the accretion rate of asteroidal or cometary dust particles.
Farley Ken A.
Patterson Desmond B.
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