Other
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..939j&link_type=abstract
(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 16th, Houston,
Other
23
Achondrites, Crystallization, Magma, Meteoritic Composition, Neodymium Isotopes, Strontium Isotopes, Chemical Evolution, Evolution (Development), Mars (Planet), Mineralogy, Rubidium Isotopes, Samarium Isotopes, Shock Loads, Meteorites, Stony Meteorites, Achondrites, Shergotty, Samples, Meteorite, Strontium, Neodymium, Isotopes, Systematics, Isotopic Ratios, Isochrons, Crystallization Age, Laboratory Studies, Contamination, Plagioclase, Phosphates, Whitlockite, Chemistry, Comparisons, Procedure, Maskelynite,
Scientific paper
Isotopic compositions of Nd and Sr were determined in mineral separates and whole rock samples of Shergotty meteorite, as well as in their leachates and residues, for the purpose of tracing the evolution of magma during crystallization of Shergotty. Two sources of Nd were observed which were not completely mixed within Shergotty: one of an apparent age of about 147 + or -20 Myr, the other of about 360 Myr. A model is proposed for the evolution of Shergotty, with a crystallization age of 360 + or -16 Myr, as indicated by a well-defined Nd isochron and supported by the Sr whole rock leachate-residue isochron. Accordingly, the magma from which Shergotty crystallized was derived from a time-integrated light rare-earth element-enriched reservoir. In contrast to most terrestrial basalts, the unradiogenic Nd was associated with unradiogenic Sr. At the end of crystallization, Shergotty was an open system and was contaminated with more radiogenic Sr and also more radiogenic Nd. At about 167 Myr Shergotty suffered partial homogenization of the Rb-Sr system, which was not completed and affected different fragments of Shergotty differently.
Jagoutz Emil
Wanke Heinrich
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