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- W2019204577 abstract "Geochronological data from different radiometric systems on high-grade metamorphic rocks in the Southwest Swedish Granulite Region, southwestern Sweden, are generally analytically precise but sometimes in conflict with each other. Age data from seven samples on which a variety of radiometric methods have been applied are presented. The age of peak metamorphism is determined by metamorphic zircons from two garnet amphibolites at c. 975 Ma using the conventional U–Pb isotope and Pb–Pb evaporation methods. Titanites from the same type of rocks give ages of c. 923±3 Ma and 945±2 Ma. The Sm–Nd data on mafic granulites and garnet amphibolites yield surprisingly young ages between 945 and 900 Ma, similar to previous Sm–Nd ages. These ages are comparable to, or even younger than, the 40Ar–39Ar hornblende ages that range between 1030 and 930 Ma. Assuming that the Sm–Nd systematics are entirely controlled by volume diffusion, the closure temperature of the Sm–Nd system in minerals from these rocks would be comparable to, or lower than, that of Ar diffusion in hornblende, i.e. around 500°C." @default.
- W2019204577 created "2016-06-24" @default.
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- W2019204577 date "1998-12-01" @default.
- W2019204577 modified "2023-09-27" @default.
- W2019204577 title "U–Pb and Sm–Nd dating of high-pressure granulite- and upper amphibolite facies rocks from SW Sweden" @default.
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- W2019204577 doi "https://doi.org/10.1016/s0301-9268(98)00084-9" @default.
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