No evidence for a 0.8-0.9 m.y. old micro-australite layer in deep-sea cores

Details No evidence for a 0.8-0.9 m.y. old micro-australite layer in deep-sea cores No evidence for a 0.8-0.9 m.y. old micro-australite layer in deep-sea cores

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..77..428g&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 77, no. 3-4, April 1986, p. 428-433.

Physics

3

Core Sampling, Micrometeorites, Ocean Bottom, Radioactive Age Determination, Tektites, Argon Isotopes, Australia, Magnetic Field Inversions, Spherules, Tektites, Australites, Fission Tracks, Dating Methods, Isotopic Ratios, Argon, Age, Microtektites, Layers, Core Samples, Origin, Source, Formation, Impacts, Boundaries

Scientific paper

Fission-track and Ar-40 to Ar-39 dating of Australasian tektites indicates that the australites are older than the rest of the australasian tektites. It has been suggested, therefore, that there should be two microtektite layers in the Australasian region: a younger layer approximately synchronous with the Brunhes/Matuyama geomagnetic reversal boundary and an older layer of Australian microtektites (microaustralites) below the Brunhes/Matuyama reversal boundary and perhaps associated with the end of the Jaramillo event. Fifteen cores already known to contain a layer of Australasian microtektites at or slightly above the Brunhes/Matuyama reversal boundary were searched for a 0.8 to 0.9 m.y. old microaustralite layer. No evidence for this layer was found. Thus, the data do not support the conclusion that the Australasian tektites were produced by two impact events at different times.

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