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- W2003128166 abstract "U-Pb isotopic analyses were made on sphene, three epidote fractions, apatite, K-feldspar and plagioclase from a 314-m.y.-old tonalite member of the Zentralgneis plutonic suite in the southeast Tauern Window. The tonalite reached temperatures in excess of 550°C during the Tertiary Alpine metamorphism. Apatite, fine-grained clinozoisite and feldspars equilibrated during the metamorphism, and the apatite yields an age of 22 m.y. which is 6 m.y. older than the Rb-Sr age of coexisting biotite. Sphene and coarse-grained iron-rich epidote did not reach equilibrium during Alpine metamorphism and the sphene data indicate crystallisation before 215 m.y. These minerals contain a large proportion of the uranium and thorium in the rock and the data thus imply that the present distribution of heat-producing elements in the tonalite was established long before the Alpine metamorphism. The very high closure temperatures for sphene and epidote implied by the data suggest they may be of value in dating metamorphism." @default.
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- W2003128166 title "Uranium-lead isotope systematics in a regionally metamorphosed tonalite from the eastern Alps" @default.
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- W2003128166 doi "https://doi.org/10.1016/0012-821x(80)90132-6" @default.
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