Late Permian Intraplate Magmatism of the Baikal-Muya Belt: U-Pb Geochronology and Nd-Isotope Data.

Abstract: This paper presents the results of U-Pb isotope-geochronological study on zircons from subalkali gabbros and granodiorites of the Dogaldyn intrusive massif located in the Karalon-Mamakan zone of the Baikal-Muya belt. The ages of 254 ± 2 and 256 ± 1 Ma yielded for rocks of the two main intrusion phases do not differ significantly from each other and correspond to the Late Permian period. The Nd-isotope and geochemical data indicate the relationship between the primary melts of intraplate rocks from the Dogaldyn Massif and various sources, including plume-mantle and ancient crustal ones. The manifestations of Late Permian intraplate magmatic activity in the Baikal-Muya belt could have been induced by the Iberian superplume framed by the Siberian trap province. [ABSTRACT FROM AUTHOR]