Published in Doklady Earth Sciences
AbstractA vast area of up to five million square kilometers is located in the Pacific Ocean to the east of Australia. The Earth’s crust up to 10–23 km thick is submerged here to a depth of 1–4 km. This contrasts with the surrounding Southwest Pacific where the crust is submerged up to 5–6 km and has a thickness of 7 km, which is more typical for oc...
Published in Doklady Earth Sciences
AbstractNew results are presented on the features of the deep velocity structure of two of the three main tectonic blocks that make up the Kola region—Murmansk and Belomorskii—by the P receiver function technique. The research is based on data from the broadband seismic stations Teriberka and Kovda. The results are compared with the models obtained...
Published in Doklady Earth Sciences
AbstractTwo sections of the Xintiangou Formation were examined in the Yunyang area, Northeastern Sichuan Basin, China. One of them was systematically sampled from bottom to top. Palynology and geochemistry analyses were performed on 20 samples, and Paleoclimatic indicators were extracted. The sporopollen assemblage indicates arid and hot paleoclima...
Published in Doklady Earth Sciences
AbstractWe present the results of analysis of the Strombolian-type Deception volcano after its explosive caldera-forming eruption. The volcano studied, located in the South Shetland Archipelago (Antarctica), was selected in accordance with the “Strategy for the Development of the Russian Federation Activities in Antarctica for the Period until 2020...
Published in Doklady Earth Sciences
AbstractA series of experiments are carried out with a stick–slip earthquake model consisting of two granite blocks under biaxial compression loading. The mechanical stresses, strains, and acoustic emission are recorded. The model is subjected to calibrated mechanical impacts. The stages of exponential acceleration of motions of the sides of the co...
Published in Doklady Earth Sciences
AbstractSignificant variations in the composition of garnets, both within individual grains and in the rock, are found in the xenolith of deformed garnet lherzolite from the Udachnaya kimberlite pipe. The central parts of the grains, corresponding in composition to the garnets of the lherzolite paragenesis, demonstrate a sinusoidal distribution of ...
Published in Doklady Earth Sciences
AbstractNumerical modeling of the dynamics of the block structure and the resulting seismicity of the Altai–Sayan–Baikal region has been carried out. The earthquake epicenters obtained in the model are located in the vicinities of all earthquakes with M ≥ 6.0 and most earthquakes with M ≥ 5.0 that have occurred in the region. The Gutenberg–Richter ...
Published in Doklady Earth Sciences
AbstractThis paper examines the role of forests in national climate policies of two countries very rich in woods: Russia and Canada. Canada has made efforts to reduce direct CO2 emissions in the national economy, intensify forestry, and increase greenhouse gas sequestration by forests. Russia focuses on the verification and recalculation of the car...
Published in Doklady Earth Sciences
AbstractNew U–Pb and 40Ar/39Ar isotopic dates on volcanic rocks of the East Chukotka segment of the Okhotsk–Chukotka Belt correspond to 76–71 Ma span, which is partially beyond the conventional lifetime of this volcanic province. This could result from the migration of magmatic loci along the strike of the volcanic belt, and/or from the overprint b...
Published in Doklady Earth Sciences
AbstractThe morphology of archaeocyaths from the Oldynda Formation of the Uda–Vitim lithofacial zone and the Aikta Formation of the Birami–Yanguda Zone of West Transbaikalia are described. The age of these formations is refined for the first time on the basis of C and Sr isotope chemostratigraphy. Three Archaeocyatha horizons (Uldzuitui of the Atda...
