Noble gases in ten, small Yamato chondrites

Details Noble gases in ten, small Yamato chondrites Noble gases in ten, small Yamato chondrites

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982polre..25..153t&link_type=abstract

(Symposium on Antarctic Meteorites, 7th, Tokyo, Japan, Feb. 19, 20, 1982) National Institute of Polar Research, Memoirs, Special

Mathematics

Logic

Meteorites, Antarctic Meteorites, Rare Gases, Yamato Meteorites, Chondrites, Stony Meteorites, Samples, Meteorite, Laboratory Studies

Scientific paper

Concentrations of noble gases and isotopic compositions of He, Ne and Ar were determined for small Yamato chondrites. Five of the ten specimens studied showed high (Ne-22/Ne-21)c ratios, suggesting hard cosmic-ray irradiation in small bodies in space or near surfaces of meteoroids. Among them, Y-74447 (H) shows a cosmogenic Ne-22/Ne-21 ratio as high as 1.306 + or 0.040, which suggests a very hard cosmic-ray irradiation in a small body. The preatmospheric size of this chondrite may be as small as inferred from its recovered mass (14.3 g). No significant difference was found in cosmic-ray irradiation history between Antarctic and non-Antarctic chondrites. Cosmic-ray irradiation ages and U/Th-He and K-Ar ages are given. While Y-74138 (H) was found to contain appreciable amounts of trapped, solar-type gases, Y-74060 (H) shows complete loss of radiogenic He-4, and radiogenic Ar-40 as low as that found in shocked L chondrites. The Y-74060 chondrite is one of those rare cases in which H chondrites lost radiogenic gases by shock or other metamorphic events. Trapped planetary gases are discussed in relation with petrologic types.

Affiliated with

Also associated with

No associations

Rating

Noble gases in ten, small Yamato chondrites 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 ten, small Yamato chondrites, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noble gases in ten, small Yamato chondrites will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-931697