New U-Pb and Sm-Nd-isotope data of the age of formation and metamorphic alteration of the Kandalaksha-Kolvitsa gabbro-anorthosite complex (Baltic shield)

New U-Pb and Sm-Nd isotopic and geochronological data for the rocks of the Kandalaksha-Kolvitsa Paleoproterozoic gabbroanorthosite complex is presented. For the first time single zircon grains from metagabbros of Kolvitsa massif were dated (2448±5) Ma, using U-Pb method with an artificial 205Pb tracer. Sm-Nd isotopic age of the metamorphic minerals apatite, garnet and sulphide WR Kolvitsa array is (1985 ± 17) Ma, which is interpreted as granulite metamorphism. Zircon from anorthosite massif reflected Kandalaksha U-Pb age of the early stages of granulite metamorphism equal to (2230 ± 10) Ma. Sm-Nd research Kandalaksha massif reflected the age of the high-temperature metasomatic transformations - (1887 ± 37) Ma. Time of regional fluid processing - (1692 ± 71) Ma. A model Sm-Nd age of metagabbros of Kolvitsa massif is 3.3 Ga with a negative value eNd = -4.6, which corresponds to the most likely primary enriched mantle reservoir of source magma like PGE layered intrusions of Paleoproterozoic (Fedorovo-Pansky massif, Imandra lopolith, Mt. Generalskaya, Monchegorskiy pluton, Monchetundra).