New Data on the Polychronic Early Paleozoic Alkaline Magmatism in the Tuva–Mongolian Massif of the Central Asian Orogeny Belt

New data on the geology, geochemistry, and age of alkalinene magmatism in the Southwest Khovsgol region are reported. Based on the U–Pb (ID-TIMS) geochronological study of titanite from alkaline clinopyroxenite of the Shivleggol massif (part of the Beltesingol group of massifs), the age is estimated at 450 ± 1 Ma. This new age makes it possible to outline one more stage of polychronous Early Paleozoic alkaline magmatism within the Tuva–Mongolian massif.