Clues to the nature of the impacting bodies from platinum-group elements (PGEs, RE and Au) in borehole samples from the Clearwater East crater (Canada) and the Boltysh impact crater (Ukraine)

Details Clues to the nature of the impacting bodies from platinum-group elements (PGEs, RE and Au) in borehole samples from the Clearwater East crater (Canada) and the Boltysh impact crater (Ukraine) Clues to the nature of the impacting bodies from platinum-group elements (PGEs, RE and Au) in borehole samples from the Clearwater East crater (Canada) and the Boltysh impact crater (Ukraine)

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997m%26ps...32..761s&link_type=abstract

Meteoritics & Planetary Science, vol. 32, no. 6, pages 761-767

Computer Science

4

Scientific paper

Seven large (10 g) impact melt rock samples from boreholes from the Boltysh impact crater (Ukraine) and six samples from the East Clearwater crater (Canada) were analyzed for Os, Ir, Ru, Rh, Pd, Re and Au by the nickel sulfide technique in combination with neutron activation. Earlier analyses of Clearwater East impact melt rocks have shown that they are strongly enriched in Ir, Os, Pd and Re. In this work I confirm earlier findings and demonstrate similarly high enrichments of Rh and Ru. The average Os/Ir, Ru/Ir, Pd/Ir, Rh/Ir and Ru/Rh ratios of the melt rock samples from Clearwater East are CI-chondritic and yield an average Ir-content of 25.2 ( 6.5 ng/g relative to an average upper crust concentration of 0.03 ( 0.02 ng/g Ir. The amount of meteoritic component corresponds to 4 to 7% of a nominal CI component for Clearwater East. The impact melt rock samples from a bore hole from Boltysh are low in Ir with an average of 0.2 ( 0.1 ng/g. CI-normalized abundances increase from the refractory to the more volatile siderophile elements (Os < Ir < Ru < Rh ( Pd ( Au ( Ni ( Co). Because of the low Ir anomaly and uncertainties in making corrections (correlations are weak) for indigeneous siderophile elements, no clear projectile assignment can be made.

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