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Meteoritic material at five large impact cratersThe 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).
Document ID
19780042938
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Palme, H.
(Chicago Univ. Chicago, IL, United States)
Janssens, M.-J.
(Chicago Univ. Chicago, IL, United States)
Takahashi, H.
(Chicago Univ. Chicago, IL, United States)
Anders, E.
(Chicago Univ. Chicago, IL, United States)
Hertogen, J.
(Chicago, University Chicago, Ill., United States)
Date Acquired
August 9, 2013
Publication Date
March 1, 1978
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 42
Subject Category
Lunar And Planetary Exploration
Accession Number
78A26847
Funding Number(s)
CONTRACT_GRANT: NGL-14-001-167
Distribution Limits
Public
Copyright
Other

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