Open AccessVolcanogenic material in upper jurassic-lower cretaceous deposits of the Eastern Russian plate and its sources
Author(s) -
Konstantin I. Nikashin,
Svetlana O. Zorina
Publication year - 2021
Publication title -
izvestiâ saratovskogo universiteta. novaâ seriâ. seriâ nauki o zemle
Language(s) - English
Resource type - Journals
eISSN - 2542-1921
pISSN - 1819-7663
DOI - 10.18500/1819-7663-2021-21-1-49-57
Subject(s) - geology , pyroclastic rock , cretaceous , igneous rock , basalt , geochemistry , felsic , andesite , paleontology , volcano , structural basin , volcanic rock
. Widespread “camouflaged” pyroclastics including smectite, illite-smectite and heulandite are detected in the upper jurassic– lower cretaceous deposits of the Ulyanovsk-Saratov basin. Moreover, volcanic glasses are found in several stratigraphic units. The quantity of pyroclastic material in the study section (17–72%) is probably related to volcanic input in the basin. Concentrations of the trace and rare earth elements point to a predominantly acid source of ash material, except the Promzino and Ulyanovsk black shale formations linked to the mixed andesite-basaltic and felsic sources. Island arcs of the Northern Tethys basin and the High-Altitude Arctic Igneous Province are regarded as probable sources of the pyroclastic influx in the epeiric basin of the Russian Platform in the Jurassic-Early Cretaceous.