What question did this study set out to answer?

To determine the age of metavolcanic rocks in the Kurumkan Formation of the Aldan Shield using U–Pb geochronology.

April 25, 2026Doklady Earth Sciences0 citations

Age of Metavolcanic Rocks of the Kurumkan Formation of the Aldan Shield

СВС. Д. ВеликославинскийInstitute of Precambrian Geology and Geochronology VBV. V. BortnikovInstitute of Precambrian Geology and Geochronology ESE. B. Sal’nikovaInstitute of Precambrian Geology and Geochronology

Key Points

To determine the age of metavolcanic rocks in the Kurumkan Formation of the Aldan Shield using U–Pb geochronology.
Utilized U–Pb (ID-TIMS) geochronological techniques on zircon samples
Analyzed biotite–hypersthene plagiogneiss (metadacite) for crystallization age
Assessed model ages of metasedimentary rocks in the formation
Crystallization age of the biotite–hypersthene plagiogneiss protolith is 2395 ± 6 Ma
Metasedimentary rocks exhibit Nd model ages of 2.3–2.2 Ga, indicating they are younger than metavolcanic rocks
Diverse ages reflect different geological evolution stages in the Early Proterozoic.

Abstract

The results of U–Pb (ID-TIMS) geochronological studies of zircon from biotite–hypersthene plagiogneiss (metadacite) of the Kurumkan Formation, Aldan Shield, are presented. The obtained crystallization age of the biotite–hypersthene plagiogneiss protolith is 2395 ± 6 Ma. Metasedimentary rocks of the Kurumkan Formation, some of which are characterized by Nd model ages tNd(DM) = 2.3–2.2 Ga, are clearly younger than metavolcanic rocks. This indicates that the formation includes rocks of different ages, whose origin is associated with distinct stages of the Early Proterozoic geological evolution of the Aldan Shield.

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