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- W1640792978 abstract "Diffusive losses of rare gases from meteorites have been suggested by several authors, and diffusion studies on unseparated chondritic materials have been carried out. The gas-release patterns found were complicated by geometric and mineralogical effects. In this paper, the gas release from separated minerals has been investigated, using an experimental procedure designed both to permit the evaluation of activation energies as a function of temperature in a way independent of geometric effects, and to give an indication of the relative retentiveness of the different minerals for the various gases. From the detailed release patterns obtained by this procedure, the ratio of the effective diifusion coefficients at two consecutive temperatures can be evaluated, without assumptions about geometry or particular release mechanisms. Effective values of the activation energy can be calculated from these ratios. The conclusion by Hintenberger, Schultz and Wänke, that pyroxene is less retentive of He than is olivine, has been confirmed and extended to include Ne and possibly Ar. Both minerals are less retentive of He than of Ne, and less retentive of Ne than of Ar. Natural diffusive losses will therefore lead to fractionated abundance patterns. Activation energies Q eff of about 30–65 Kcal/mole for He release, and up to 120 Kcal/mole for Ne release, have been determined. The Q eff values increase with temperature and at higher temperatures (above 400°C) are generally larger for He release from olivine than for pyroxene, about the same for Ne release from both minerals, and larger for Ne release than for He release. There is a correlation between Q eff values and gas release patterns, particularly for Ne, indicative of release from several sites with different diffusion characteristics. The value of gas release patterns in establishing natural gas losses has been demonstrated, both in the comparison of the release patterns of the mineral separates, and in the comparison of these with release patterns previously obtained from the chondrites Renazzo and Fayetteville." @default.
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- W1640792978 date "1969-01-01" @default.
- W1640792978 modified "2023-10-03" @default.
- W1640792978 title "The Thermal Release of Rare Gases from Separated Minerals of the Mócs Meteorite" @default.
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- W1640792978 doi "https://doi.org/10.1007/978-94-010-3411-1_72" @default.
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