Meteoritic material at five large impact craters

Details Meteoritic material at five large impact craters Meteoritic material at five large impact craters

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42..313p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 42, Mar. 1978, p. 313-323.

Computer Science

30

Chondrites, Meteorite Craters, Meteoritic Composition, Achondrites, Iron Meteorites, Meteorite Collisions, Neutron Activation Analysis, Stony Meteorites, Trace Elements, Meteoroid Impacts, Craters, Terrestrial, Samples, Meteorite, Meteorites, Neutron Activation Analysis, C1 Chondrites, Melts, Siderophile Elements, Trace Elements, Nickel, Ries Crater, Germany, Mistastin Crater, Manicouagan Crater, Clearwater East Crater, Tektites, Rocks, Glasses, Stony Meteorites, Clearwater West Crater, Lake Bosumtwighana C

Scientific paper

The paper analyzes the meteoritic material at five multikilometer craters: Clearwater (Lac a l'Eau Claire) East and West (22 and 32 km), Manicouagan (70 km) and Mistastin (28 km), all in Canada; and Lake Bosumtwi (10.5 km), Ghana, which is associated with Ivory Coast tektites. Radiochemical neutron activation analysis is applied to 16 crater samples for the siderophile trace elements Ir, Os, Pd, Ni, Ge, and Re, which are depleted to varying degrees in the earth's crust but are abundant in all meteorites except achondrites. It is found that only two samples, both from Clearwater, exhibit a strong meteoritic signal. The remaining ones fall within or slightly above the range for terrestrial rocks, and therefore at best contain only small meteoritic components. Clearwater East is the first terrestrial impact crater to be associated with a stony meteorite (a C1 or C2 chondrite).

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