I-Xe systematics in LL chondrites

Details I-Xe systematics in LL chondrites I-Xe systematics in LL chondrites

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1113b&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, May 1988, p. 1113-1121.

Other

3

Argon, Chondrites, Iodine Isotopes, Meteoritic Composition, Xenon, Geochronology, Neutron Irradiation, Radioactive Age Determination, Meteorites, Iodine, Xenon, Argon, Laboratory Studies, Stony Meteorites, Ll Chondrites, Chondrites, Soko Banja, Alta Amenn, Tuxtuac, Guidder, Olivenza, Samples, Meteorite, Thermal History, Procedure, Chronology, Age, Temperature, Metamorphism, Petrography

Scientific paper

A stepwise heating analysis of Ar and Xe data from five neutron-irradiated whole rock LL chondrites (Soko Banja, Alta Ameen, Tuxtuac, Guidder, and Olivenza) is presented, emphasizing the complicated thermal history of ordinary chondrites. None of the present meteorites show a well-defined (Ar-40)-(Ar-39) apparent age plateau comprised of more than two release fractions. Most of the samples are found to yield well-defined high-temperature correlations between Xe-129/Xe-130 and Xe-128/Xe-130, and thus determinations of I-129/I-127 and Xe-129/Xe-130 at the time of isotopic closure for Xe. As in the case of other ordinary chondrites, the I-Xe systematics for LL chondrites correlate neither with a metamorphic grade nor with chronologies based opon other methods.

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