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Showing 1 to 2 of 2 for “"metamictisation"”.
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Auswirkungen der hydrothermalen Alteration und der Metamiktisierung auf die U-Th-Pb-Verteilung und die U-Pb-Isotopensystematik in Pyrochlor des Sokli Karbonatit-Komplex, N-Finnland
… a principle change in crystallinity caused by metamictisation due to high U- and Th- concentrations. These high concentrations make pyrochlore useful for age determinations, albeit the metamict state and its modified diffusibility for chemical elements can disturb this. The U- concentration …
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Combining microstructural analysis with EPMA monazite geochronology to constrain progressive stages of orogenesis in the Appalachians
… et al., 2002; Cherniak et al., 2004), or metamictisation (Ewing and Haaker, 1980; Meldrum et al., 1997). Consequently, it is widely used to date metamorphic, igneous and hydrothermal events. Monazite contains little or no common Pb (Parrish, 1990). Therefore, it can be chemically dated …