Times of impacts that deliver samples of Vesta to Earth derived from ultrasensitive Kr-81-Kr cosmic ray exposure age analysis of Eucrites

0399272 - ASÚ 2014 RIV GB eng J - Článek v odborném periodiku
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
Institucionální podpora: RVO:67985815
Klíčová slova: ionization mass-spectrometer * noble-gases * production-rates
Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
Impakt faktor: 4.250, rok: 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.
Trvalý link: http://hdl.handle.net/11104/0226593