Accretion rates of meteorites and cosmic dust in the Early Ordovician.

Details Accretion rates of meteorites and cosmic dust in the Early Ordovician. Accretion rates of meteorites and cosmic dust in the Early Ordovician.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997sci...278...88s&link_type=abstract

Science, Vol. 278, No. 5335, p. 88 - 90

Physics

24

Earth: Accretion, Earth: Meteorites, Earth: Cosmic Dust

Scientific paper

Abundant fossil meteorites in marine, condensed Lower Ordovician limestones from Kinnekulle, Sweden, indicate that accretion rates of meteorites were one to two orders of magnitude higher during an interval of the Early Ordovician than at present. Os isotope and Ir analyses of whole-rock limestone indicate a coeval enhancement of one order of magnitude in the influx rate of cosmic dust. Enhanced accretion of cosmic matter may be related to the disruption of the L chondrite parent body around 500 million years ago.

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