Noble Gases in Desert Meteorites: Howardities, Unequilibrated Chondrites, Regolith Breccias and an LL7

Details Noble Gases in Desert Meteorites: Howardities, Unequilibrated Chondrites, Regolith Breccias and an LL7 Noble Gases in Desert Meteorites: Howardities, Unequilibrated Chondrites, Regolith Breccias and an LL7

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000lpico.997...90w&link_type=abstract

Workshop on Extraterrestrial Materials from Cold and Hot Deserts, p. 90

Other

1

Meteoritic Composition, Meteorites, Gas Composition, Rare Gases, Deserts, Chondrites, Chemical Composition, Achondrites, Breccia, Nuclides, Cosmic Rays

Scientific paper

We present He, Ne, and Ar data of 39 samples from 17 meteorites of various types. For three CV3 and two unequilibrated ordinary chondrites Kr and Xe data are also reported. The analyses served various purposes, e. g. to check for presence of solar noble gases, to determine concentrations of primordial noble gases, to study cosmic ray exposure ages including possible parent body exposures, and to recognize paired meteorites. The data are shown in Tables 1 and 2. Ne-21 exposure ages are calculated with the cosmogenic nuclide production model by Leya et al., assuming average chemical composition of the respective meteorite class and taking the (Ne-22/Ne-21)cos ratio as shielding parameter. In some cases we had to assume additionally a meteoroid radius <32 cm. We report an age range (T(sup 21) min - T(sup 21) max) rather than a single age to indicate that even when (Ne-22/Ne-21)cos is available, meteoroid size and sample depth are not unambiguously known, hence the Ne-21 production rate is only constrained to within certain limits. The mean production rates used here compare well with those given by Eugster and Eugster and Michel for (Ne-22/Ne-21)cos values between 1.08 - 1.12 (chondrites) and 1.10 - 1.15 (howardites), respectively. On the other hand, our values are up to 30% lower for high (Ne-22/Ne-21)cos values, i.e. small meteorites and low shielding.

Affiliated with

Also associated with

No associations

Rating

Noble Gases in Desert Meteorites: Howardities, Unequilibrated Chondrites, Regolith Breccias and an LL7 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 Desert Meteorites: Howardities, Unequilibrated Chondrites, Regolith Breccias and an LL7, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noble Gases in Desert Meteorites: Howardities, Unequilibrated Chondrites, Regolith Breccias and an LL7 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-807925