caa a22 4500 467890137 CHVBK 20180406152746.0 cr unu---uuuuu 170328e20060301xx s 000 0 eng 10.1007/s00710-005-0110-8 doi (NATIONALLICENCE)springer-10.1007/s00710-005-0110-8 Age and geochemical constraints for partial melting of granulites in Estonia [Elektronische Daten] [A. Soesoo, J. Košler, R. Kuldkepp] Summary: The rocks of the crystalline basement of the East European Craton in southern Estonia show effects of partial melting under granulite facies conditions. Zircons extracted from partial melting products (tonalite from the Tapa Zone - 1824 ± 26, tonalite from the South Estonian Zone - 1788 ± 16 Ma and charnockite from the Tapa Zone - 1761 ± 11 Ma) yield U-Pb crystallisation ages that span over approximately 80 Ma, suggesting a prolonged high-grade metamorphism or several separate events. U-Pb zircon age of one sample of charnockite is concordant with the Nd model age of partial melting of its host mafic granulite facies gneiss (intercept at 1.76 Ga). Linear geochemical trends and similar initial Nd isotopic compositions of mafic granulites and charnockites suggest their possible genetic relationship. From our new and previously published data it follows that the peak granulite metamorphic conditions and formation of tonalites and charnockites (850 °C and 6 kbar) in the Estonian basement occurred at 1788-1778 Ma. Then, the rocks cooled down, passing through the garnet closure temperature of approximately 650-700 °C at 1728 ± 24 Ma. The age of metamorphism of the Estonian granulites is lower than the metamorphic ages known from southern Finland, but it is similar to the age of metamorphism reported from the Belarus-Baltic Granulite Belt in Latvia. Springer-Verlag/Wien, 2006 Soesoo A. Institute of Geology, Tallinn University of Technology, Tallinn, Estonia aut Košler J. Department of Geochemistry, Charles University, Prague, Czech Republic aut Kuldkepp R. Institute of Geology, Tallinn University of Technology, Tallinn, Estonia aut Mineralogy and Petrology Springer-Verlag 86/3-4(2006-03-01), 277-300 0930-0708 86:3-4<277 2006 86 710 https://doi.org/10.1007/s00710-005-0110-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00710-005-0110-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Soesoo A. Institute of Geology, Tallinn University of Technology, Tallinn, Estonia aut NATIONALLICENCE 700 1- Košler J. Department of Geochemistry, Charles University, Prague, Czech Republic aut NATIONALLICENCE 700 1- Kuldkepp R. Institute of Geology, Tallinn University of Technology, Tallinn, Estonia aut NATIONALLICENCE 773 0- Mineralogy and Petrology Springer-Verlag 86/3-4(2006-03-01), 277-300 0930-0708 86:3-4<277 2006 86 710 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer