Other
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..275c&link_type=abstract
In Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 275-276 (SEE N94-12015 01-91)
Other
6
Fractionation, Lead Isotopes, Meteoritic Composition, Mineralogy, Petrology, Shergottites, Thorium Isotopes, Uranium Isotopes, Antarctic Regions, Mars Surface, Regolith, Solar System, Terrestrial Planets
Scientific paper
We report on the isotopic composition of Pb and the concentration of Pb, U, and Th in a sample of LEW88516 (LEW). LEW was a 13-g stone recovered from Antarctica and was classified as a new member of the Shergottite group. This work was undertaken with the hope that LEW might yield new information to elucidate further the origin and evolution of Shergottites and other SNC meteorites. We have previously studied U-Th-Pb in other Shergottites, namely Shergotty, Zagami, EETA79001, and ALHA77005, as well as Nakhla. The results indicate that the initial leads of these Shergottites were well defined, were distinct from each other, and have high Pb-204/Pb-206 (from 0.0652 to 0.0739). These leads evolved in different reservoirs over most of solar system history in a low U-238/Pb-204(micro) is approximately equal to 5 environment. The U-Th-Pb isotopic systems are quite regular, which unambiguously indicates an event of U-Th-Pb fractionation at approximately 200 m.y. The details of the data arrays are complex. The young age is in general agreement with some of the ages obtained by other methods, but precise concordance between the different methods is not established. The new results on LEW are remarkably similar to those of ALHA77005 and support the other observations based on the mineralogy, petrology, and bulk composition. The clear distinction between the Shergottites and Nakhla is confirmed. We consider that the Shergottites and possibly all the SNC's were derived from an impact on the regolith of a differentiated terrestrial type planetary body (Mars?) with a high content of volatiles as compared to the earth.
Chen Jacqueline H.
Wasserburg Gerald J.
No associations
LandOfFree
LEW88516 and SNC meteorites does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with LEW88516 and SNC meteorites, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and LEW88516 and SNC meteorites will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1447449