Revised age for the Gosses Bluff impact structure, Northern Territory, Australia, based on Ar-40Ar-39 dating

Details Revised age for the Gosses Bluff impact structure, Northern Territory, Australia, based on Ar-40Ar-39 dating Revised age for the Gosses Bluff impact structure, Northern Territory, Australia, based on Ar-40Ar-39 dating

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987metic..22..281m&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 22, Sept. 30, 1987, p. 281-289.

Physics

8

Argon Isotopes, Geochronology, Meteoritic Damage, Meteoritic Microstructures, Mineralogy, Radioactive Age Determination, Australia, Grain Size

Scientific paper

Ar-40Ar-39 dating of a pumiceous suevite clast from the melt breccia at Gosses Bluff consisting largely of extremely fine-grained sanidine yields a discordant age spectrum, probably reflecting some diffusional loss of argon. High-temperature increments that together yield a near-plateau age of 142.5 Ma are apparently not affected by argon loss and offer the best estimate of the date of the Gosses Bluff event. The event may fall in the latest Jurassic Period, but more likely falls in the earliest Cretaceous, probably in one of the reverse-polarity magnetochrons M16, M17, or M18.

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