Evidence for a very high carbon/iridium-ratio in the Tunguska impactor

Details Evidence for a very high carbon/iridium-ratio in the Tunguska impactor Evidence for a very high carbon/iridium-ratio in the Tunguska impactor

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999m%26ps...34..891r&link_type=abstract

Meteoritics & Planetary Science, vol. 34, no. 6, pp. 891-895 (1999).

Physics

7

Scientific paper

We have measured excess Ir and depletion of 14C, two independent indicators of cosmic material, in peat cores from the central Tunguska impact site. Both Ir and 14C show pronounced anomalies in the same stratigraphical depth interval. We have estimated an integral deposition of non-radioactive cosmogenic carbon of 6.8 deg 1.0 mg C cm-2, and an integrated iridium deposition of 5.9 deg 1.2 pg Ir cm-2. The very high C/Ir-ratio and a deduced (13C-value of +55 deg 10 o/oo VPDB of the impactor material found in this study points towards a cometary type impactor, rather than a chondritic or achondritic asteroidal type impactor.

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