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Times of impacts that deliver samples of Vesta to Earth derived from ultrasensitive Kr-81-Kr cosmic ray exposure age analysis of Eucrites
- 1.0399272 - ASÚ 2014 RIV GB eng J - Journal Article
Strashnov, I. - Bland, P.A. - Spurný, Pavel - Towner, M.C. - Gilmour, D.J.
Times of impacts that deliver samples of Vesta to Earth derived from ultrasensitive Kr-81-Kr cosmic ray exposure age analysis of Eucrites.
Geochimica et Cosmochimica Acta. Roč. 106, April (2013), s. 73-81. ISSN 0016-7037. E-ISSN 1872-9533
Institutional support: RVO:67985815
Keywords : ionization mass-spectrometer * noble-gases * production-rates
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 4.250, year: 2013
Concentrations and isotopic compositions of krypton have been measured in Eucrite falls using a new resonance ionization mass-spectrometer (RIMSKI). The high sensitivity of the apparatus allowed sample sizes to be reduced to 1-4 mg for Kr-81-Kr cosmic ray exposure age determination. Kr-81 CRE ages have been determined for: Bereba, Bouvante, Ibitira, Juvinas, Millbillillie, Padvarninkai, Pasamonte and Stannern with precision comparable to those reported by other groups for analyses of >100 times larger samples. The Kr-81-Kr CRE ages of Lakangaon (25.3 +/- 1.1 My) and Bunburra Rockhole (27.6 +/- 1.4 My) have been determined for the first time.
Permanent Link: http://hdl.handle.net/11104/0226593
Number of the records: 1