Dispersion of uranium in accessory apatite in crystalline rocks and its possible petrogenetic meaning |
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| Authors: | Ján Krá? Jan Burchart |
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| Institution: | 1. Geological Institute, Slovak Academy of Sciences, Dúbravskácesta 9, 814 73 Bratislava Czechoslovakia;2. Institute of Geological Sciences, Polish Academy of Sciences, Zwirki i Wigury 93, 02-089 Warsaw Poland |
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| Abstract: | The coefficient of variation for grain-by-grain fission track uranium analysis of apatites from igneous rocks seems to reflect the temperature of crystallization and the cooling rate. For metamorphic rocks the coefficient represents a complex record of the homogeneity of the source and of metamorphic neocrystallization. As a test case 41 West Carpathian rocks have been examined and the coefficients of variation for U in apatites found to be: granitic rocks 0.30–0.79, paragneisses 0.35–0.95, migmatites 0.55–0.87, and volcanic rocks 0.30–0.40. Most of the frequency distributions are lognormal, though for some cases a normal distribution gives a better fit, and some are incompatible with either of the two distributions. |
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