Determining Chondritic Impactor Size from the Marine Osmium Isotope Record

Details Determining Chondritic Impactor Size from the Marine Osmium Isotope Record Determining Chondritic Impactor Size from the Marine Osmium Isotope Record

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sci...320..214p&link_type=abstract

Science, Volume 320, Issue 5873, pp. 214- (2008).

Physics

10

Scientific paper

Decreases in the seawater 187Os/188Os ratio caused by the impact of a chondritic meteorite are indicative of projectile size, if the soluble fraction of osmium carried by the impacting body is known. Resulting diameter estimates of the Late Eocene and Cretaceous/Paleogene projectiles are within 50% of independent estimates derived from iridium data, assuming total vaporization and dissolution of osmium in seawater. The variations of 187Os/188Os and Os/Ir across the Late Eocene impact-event horizon support the main assumptions required to estimate the projectile diameter. Chondritic impacts as small as 2 kilometers in diameter should produce observable excursions in the marine osmium isotope record, suggesting that previously unrecognized impact events can be identified by this method.

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