New data on the age (SHRIMP II) of protolith and paleoproterozoic transformations of the Archean Keivy terrain (Kola Peninsula).

The article presents a study on uranium-lead dating of protolith and paleoproterozoic tectonic and metamorphic transformations of the Archean Keivy terrain located in Kola Peninsula in Russia. It states that the Keivy terrain is composed of tonalite-trondhjemite association (TTG), Lebyazhinskaya Series and metavolcanic rocks, schists, and alkaline granites. It states that the age was estimated with the use of Sensitive High Resolution Ion Micropobe (SHRIMP) II, a secondary ion mass-spectrometer of high resolution, on zircons. It says that based of the uranium-lead dating, the age of the Keivy terrain is in the range of 1762-1721 million years (Ma).