Mathematics – Logic
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991metic..26..213k&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 26, Sept. 1991, p. 213-216. Research supported by Department of Scientific and Industrial Res
Mathematics
Logic
1
Cenozoic Era, Geochronology, Iron Meteorites, Meteoritic Composition, Oxygen Isotopes, Trace Elements
Scientific paper
Nine additional iron meteorite fragments weighing a total of 72 kg were recovered from the Derrick Peak area by a Canterbury Museum geological party in late 1988. One iron was located in the Onnum Valley, 6 km south of the previous finds. Geochemical analysis indicates that all irons belong to a single meteorite shower, greatly increasing the known extent of the fall zone. Kamp and Lowe (1982) have previously estimated the terrestrial age of the meteorite from glacial geological evidence. The location of the 1988 finds supports Kamp and Lowe's interpretation that the meteorites lie in situ, but recent revisions of the chronology of Cenozoic glacial history of the region reduce the interpreted terrestrial age. An age of between Oxygen Isotope stages 6 and 2 is probable (190-125 to 35-12 ka BP). This conflicts with a terrestrial age estimate of 1.0 +/-0.1 Ma BP from cosmogenic radionuclides.
Bradshaw Margaret A.
Harmsen Fraka J.
Kirkbride Martin P.
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