TY JOUR TI Ultrabasic rocks of ore fields of the Middle Timan: petrogeochemical and geochronological data KW ultrabasic rocks KW alkaline picrites KW chromespinelides KW Ar-Ar method KW Middle Timan JO Proceedings of the Komi Science Centre of the Ural Division of the Russian Academy of Sciences AU Udoratina, O.V. AU Shmakova, A.M. AU Travin, A.V. AU Shuyskiy, A.S. PY 2023 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"