Mathematics – Logic
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45.2443c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 45, Dec. 1981, p. 2443-2464.
Mathematics
Logic
41
Chondrites, Meteoritic Composition, Rare Gases, Trace Elements, Argon, Mass Ratios, Minerals, Petrology, Potassium, Meteorites, Stony Meteorites, Chondrites, E Chondrites, Samples, Meteorite, Laboratory Studies, Rare Gases, Exposure Age, Parent Bodies, Composition, Age, Gases, Isotopic Ratios, Procedure, Mass Spectrometry, Argon, Neon, Krypton, Xenon, Thermal History, Cosmic Rays, Origin, Formation
Scientific paper
The combination of noble gas data for 12 E-chondrites with literature data shows K-Ar ages greater than 4 AE for 14 out of 18 meteorites, while U, Th-He ages are often shorter. Cosmic ray exposure ages are found to differ systematically between types E4 and E6, with the respective, below-16 Myr and above-30 Myr values implying that the E-chondrite parent body predominantly contains a single petrologic type on the 1 km scale of individual impacts in contrast to the mixed parent bodies of the ordinary chondrites. Amounts of planetary gas in E4-E6 chondrites fall in the range for ordinary chondrites of types 4-6, but fail to correlate with petrologic type or volatile trace element contents, in contrast to the ordinary chondrites. Analyses of mineral separates show that the planetary gases are concentrated in an HFand HCl-insoluble mineral, similar to phase Q. The subsolar gases are located in an HCl- and HNO3-resistant phase.
Anders Edward
Crabb Jane
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