Mathematics – Logic
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992metic..27r.251l&link_type=abstract
Meteoritics, vol. 27, no. 3, volume 27, page 251
Mathematics
Logic
2
Scientific paper
Noble gases in chondrites are a mixture of different components that contain information on past "geological" events of the meteoritic material on their parent bodies and also on the irradiation and thermal history of the meteoroid. Furthermore, together with the mineralogical-petrographical record, the noble gases yield hints on the question of possible pairing of specimens. Seventeen different ordinary chondrites have been investigated. Results are given in Table 1. Twelve of these chondrites--marked with an asterisk--fell or have been recognized as meteorites during the last seven years. As shown by the presence of solar gases, two chondrites are regolithic breccias (Noblesville and Chiang Khan). Our analyses of Chiang Khan are different from that given by Eugster et al. (1990). It is possible that two different meteorites are known under this name. Glanerbrug, although a brecciated chondrite, does not contain solar gases. The Dunedin is a "museum-find." In 1987 it was proposed as a new meteorite (Sipiera et al., 1987). The noble gas record of Dunedin is different from that of all other yet measured LL3 and LL4 chondrites (Schultz and Kruse, 1989). Thus, these measurements do not contradict the suggestion of a distinct meteorite. A ^3He/^21Ne <1 is observed in Gilzem indicating a deficit of ^3He. This meteorite is not paired with the H5-shower of Simmern that fell in 1920 at a distance of about 40 km from Gilzem. Also the L-chondrites Pampa (a), (b), and (c) (R. Wieler, priv. communication) do not belong to the same fall. The ^3He/^21Ne-- and ^22Ne/^21Ne--ratios of individual fragments of the Kokubunji shower follow the trend-lines of the "Bern-plot." References: Eugster O., Michel Th., and Wang D. (1990) Lunar Planet. Sci. XXI, 339. Sipiera P.P., Brooks R.R. Johnston J.H., Holzbecher J., and Ryan D.E. (1987) Chem. Geol. 64, 351. Schultz L. and Kruse H. (1989) Meteoritics 24, 155. Table 1, which in the hard copy appears here, shows noble gas concetrations of the 17 ordinary chondrites under investigation.
Loeken Th.
Scherer Peter
Schultz Ludolf
Weber Harald W.
No associations
LandOfFree
Noble Gases in Several New Chondrite Falls and Finds 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 Noble Gases in Several New Chondrite Falls and Finds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noble Gases in Several New Chondrite Falls and Finds will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1209754