A THEORY OF GAS FLOW THROUGH A POROUS BODY IN THE VICINITY OF THE KNUDSEN REGION. PSEUDOMOLECULAR FLOW (in Russian)
The isotopic composition of He, Ne, Ar, and Xe gases from the Nuevo Laredo Stone meteorite has been measured. The concentrations of these gases have also been determined by isotope dilution, except in the case of Xe, where a less accurate method was employed. Radiogenic He/sup 4/ and Ar/sup 40/ are present. Cosmogenic He, Ne, and Ar are present. The Xe found, which may be entirely due to contamination, was of normal isotopic composition, a fact which has a bearing on the time-interval between nucleogenesis and the formation of meteorites. The K-A age of the stone lies between 3.1 and 3.6 x lOs years, which establishes independently of previously published lead-isotope data for the stone that it is ancient, but suggests that there has been some loss of radiogenic Ar. Most of the radiogenic He/sup 4/ has escaped, if a published value of the lead concentration is correct. The cosmogenic gases have isotopic compositions in general agreement with earlier work, but are present in lower concentrations, particularly so with He/sup 3/. This suggests that the stone has been severely heated late in its history. (auth)
- Research Organization:
- Inst. of Phys. Khim, Acad. of Sciences, U.S.S.R.
- NSA Number:
- NSA-12-000362
- OSTI ID:
- 4357693
- Journal Information:
- Doklady Akad. Nauk S.S.S.R., Journal Name: Doklady Akad. Nauk S.S.S.R. Vol. Vol: 115
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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