Physics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985geokh.....1235s&link_type=abstract
Geokhimiia (ISSN 0016-7525), Sept. 1985, p. 1235-1249. In Russian.
Physics
Chondrites, Evolution (Development), Iodine Isotopes, Radioactive Age Determination, Xenon 129, Intervals, Matter (Physics), Metamorphism (Geology), Meteoritic Composition, Petrology
Scientific paper
The times required for the formation of six ordinary L-type chondrites were estimated, based on measurements of the isotopic composition of Xe and I in the samples. The samples were irradiated using a thermal neutron flux, and isotopic composition was studied during stepwise heating. Isochrones were plotted corresponding to the high-temperature fractions of Xe. It is found that the estimated formation interval varied in the range +6.4 to -10.5 million years relative to the cooling time of the Bjurbole meteorite. An inverse correlation between the formation interval and the petrological types of the meteorites was found. It is shown that the obtained interval of formation reflects the evolution of the chondrites after condensation rather than the sequence of condensation itself. The effect of metamorphism on the calculated intervals of formation is also briefly discussed.
Dang V. M.
Fugzan M. M.
Ivanova Marina A.
Kolesov Gennadii M.
Shukoliukov Iu. A.
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