Isotopic age and heterogeneous sources of gabbro-anorthosites from the Patchemvarek massif, Kola Peninsula.

New U-Pb (SHRIMP II) data on the age (2661.8 ± 7.1 Ma) and isotopic (Sm-Nd) composition of the Patchemvarek gabbro-anorthosite massif located in the junction zone between the Neoarchean Kolmozero-Voron'ya greenstone belt and Keivy paragneiss structure are discussed. The established age and geological-tectonic position of gabbro-anorthosites allow the prognostic metallogenic estimate of Ti-V-Fe mineralization to be extended to the entire Kolmozero-Voron'ya-Keivy infrastructural zone of the Kola-Norwegian province of the Fennoscandian shield. [ABSTRACT FROM AUTHOR]