Iodine-xenon studies and the relax mass spectrometer

Details Iodine-xenon studies and the relax mass spectrometer Iodine-xenon studies and the relax mass spectrometer

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.468g&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 468-469

Computer Science

Chondrule, Iodine, Mass Spectroscopy, Meteoritic Composition, Xenon, Chronometers, Gas Analysis, Geochronology, Sulfides

Scientific paper

RELAX combines a resonance ionization ion source with a cryogenic sample concentrator to achieve ultrasensitivity. Gas is extracted from samples using either a continuous wave laser microprobe based on an argon-ion laser or a filament microfurnace. Recent refinements in the operating procedure have resulted in optimum sensitivities such that detection rates of 1 cps are achieved from fewer than 500 atoms. A Xe-128 spike reservoir has also been added and characterized, allowing accurate determinations of absolute amounts of gas. We have completed a preliminary study of the iodine-xenon system in samples from the Bjurbole and Parnallee meteorites. Bjurbole chondrules ranging in mass from 5.45 mg to 260 micrograms were analyzed by laser microprobe. The results from these samples are consistent with an effectively uniform formation age, suggesting that the use of Bjurbole chondrules for calibration of this chronometer can be extended to samples in this size range. Samples from two chondrules from the Parnallee meteorite have been analyzed to date. An alpha-cristobalite-bearing chondrule (designated CB1) was found to have a formation age 4.62 +/- 0.44 Ma after Bjurboele, while a porphyritic olivine macrochondrule appears to have been reset after the decay of I-129(t1/2 17 Ma). Consideration of these results alongside Ar-Ar data from the macrochondrule and whole rock samples suggests that Parnallee has a complex history: The macrochondrule underwent an early postcrystallization degassing event but appears to have been essentially unaffected by the later (1.9 Ga) partial resetting of the bulk meteorite.

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