Composition of sediment provenances and patterns in geological history of the Late Vendian Mezen Basin

Systematics of Th, Cr, Hf, Co, and rare-earth elements in modern bottom sediments of the white sea and lower reaches of the Severnaya Dvina River

“…This most likely provides evidence for washing within the southeastern feeding province of "juvenile" magmatic complexes in the post Vendian, especially for Sample mm 8. The T DM parameter in sediments of the marginal filter of the Severnaya Dvina River ranges from ~1.60 to 1.86 Ga. Bottom sediments collected at the boundary between Dvinskii Bay and the Basin (Samples m 5 and m 6) are characterized by a slightly older model Nd are characterized by the highest model Nd age (~2.8 Ga) among all analyzed samples, which is close to the median T DM value for magmatic and supracrustal formations of the main structural ele ments of the Baltic Shield (~2.9 Ga) [8].…”

“…Their systematics to a variable degree is comparable with the systematics of magmatic rocks predominantly of acidic composition: (La/Yb) PAAS varies from 0.6 to 1.4, (Gd/Yb) PAAS ranges within 0.8-1.9, and the Eu anomaly is positive 1.2 ± 0.4 (being normalized on average post Archean shale, PAAS [7] [8]. Data on the REE systematics and T DM values for younger deposits of the southeastern feeding area are absent; because of this, all further comparisons will be based on the data given above.…”

“…lage of Pinega and in the area of the village of Orletsy, respectively, vary from 1.60 to 1.34 Ga (Table 2), which is slightly or remarkably lower than those in fine granular terrigenous rocks of the Valdaiskaya Series [8]. This most likely provides evidence for washing within the southeastern feeding province of "juvenile" magmatic complexes in the post Vendian, especially for Sample mm 8.…”

New data on detrital zircons from the sandstones of the lower Cambrian Brusov Formation (White Sea region, East-European Craton): unravelling the timing of the onset of the Arctida–Baltica collision

“…Neoproterozoic strata occur in the middle and northern segments of the Western Urals, in the Timan Hills, the Kanin peninsula, as well as in the Varanger, Rybachiy, and Sredniy peninsulas, which are located on the northeastern edge of the Kola peninsula. A vast sedimentary depocentre, the Mezen basin, existed in the northeastern periphery of Baltica during the Ediacaran and early Cambrian (Martin 2000;Alekseev et al 2005;Fedonkin et al 2007;Maslov et al 2008Maslov et al , 2009). Parts of its sedimentary sequence are exposed as outcrops on the Zimniy Bereg of the White Sea (Grazhdankin 2004;Llanos et al 2005) and in the near-Ladoga region (Dronov et al 1995(Dronov et al , 2005Kuznetsov et al 2011), as well as having been intersected by several boreholes.…”

Neoproterozoic microfossils from the margin of the East European Platform and the search for a biostratigraphic model of lower Ediacaran rocks

“…3) and has no counterpart in that region. [For more information on the stratigraphy and tectonics of the adjacent Mezen syneclise, see Aplonov and Fedorov (2006) and Maslov et al (2008).] Stratigraphic relationships, thus, constrain the Vychegda Formation to be younger than about 800 million years (Pb-Pb dates on Uralian carbonates correlative with sub-Vychegda beds in the Kel'tminskaya-1 borehole; Ovchinnikova et al, 2000) and older than ca.…”