ARGON LOSS DURING DEFORMATION OF MICAS: CONSTRAINTS FROM LABORATORY DEFORMATION EXPERIMENTS
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dc.contributor.author | Dunlap W.J. | |
dc.contributor.author | Kronenberg A.K. | |
dc.date.accessioned | 2021-03-01T07:17:55Z | |
dc.date.available | 2021-03-01T07:17:55Z | |
dc.date.issued | 2001 | |
dc.identifier | https://elibrary.ru/item.asp?id=13639203 | |
dc.identifier.citation | Contributions to Mineralogy and Petrology, 2001, 141, 2, 174-185 | |
dc.identifier.issn | 0010-7999 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/25874 | |
dc.description.abstract | The role of internal deformation in resetting argon ages of micas has been investigated by measuring 40Ar/39Ar ratios of biotite and muscovite, before and after experimentally deforming them. Neither mica crushed cataclastically at room temperature on-line with a mass spectrometer showed any measurable change in 40Ar/39Ar age. Muscovite crystals either sheared along the K-interlayer and/or kinked at 400°C and 100–200MPa confining pressure, exhibit small (0.7–1.0%) reductions in age and marked increases in bulk diffusion coefficients, as determined from argon release during the initial stages of step-heating between 550 and 810°C. We conclude that the relatively young ages of fine-grained mica populations in naturally deformed mylonites result primarily from grain size refinement and reductions in length scale for volume diffusion and/or by syntectonic neocrystallization. Internal deformation involving dislocation slip and kinking may contribute to some argon loss by pipe diffusion, but reductions in closure temperature associated with multipath diffusion are small. | |
dc.title | ARGON LOSS DURING DEFORMATION OF MICAS: CONSTRAINTS FROM LABORATORY DEFORMATION EXPERIMENTS | |
dc.type | Статья |
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