Geochemical Features of the Diamondiferous Suevites of the Kara Astrobleme (Pay-Khoy)

Doklady Earth Sciences - The results of geochemical studies of the diamondiferous suevites of the Kara astrobleme (Pay-Khoy) using a new approach based on “area” microprobe analysis of...     

Age of titanium deposits of the northeastern part of the eastern European Platform: Rb—Sr data

Doklady Earth Sciences -     

Geological structure and isotopic—geochronologic study of rocks from the Strel’na segment of the Terskii Greenstone belt,Kola Peninsula

The geological structure, age, and genesis of sedimentary—volcanogenic, metamorphic, and metasomatic rocks from the Terskii greenstone belt fringing the southern Imandra—Varzuga structure in the southeastern Kola Peninsula are discussed with defining main stages in endogenic activity of the region in the Late Archean and Early Proterozoic. The U-Pb method (SHRIMP-II, ID-TIMS, and Pb-LS techniques) was used to determine the age of volcano-sedimentary rocks of the Imandra Group as well as that of magmatic and superimposed metamorphic and metasomatic processes. The basic—intermediate metavolcanics of the Imandra Group are dated at 2.67 Ga, which corresponds to the Lopingian Gimol’skii Superhorizon (Late Archean). The Archean metavolcanics were subjected to Early Proterozoic regional metamorphism 2.1 Ga ago and metasomatic processes in the period of 1.85 to 1.77 Ga ago. The obtained data indicate multistage evolution of rock formation in the Terskii greenstone belt located in the southern flank of the Imandra—Varzuga structure in the Kola Peninsula.     

Structural–Geomorphological Conditions of the Balakovo Nuclear Power Plant Site in Terms of the Stability of Its Buildings

Doklady Earth Sciences - The study of buried landforms during engineering–geological surveys is considered. The necessity of tracing and comprehensively studying Quaternary channels, troughs,...