Doklady Earth Sciences, 2021, V 497, No. 2.

 
Geology

The First Data of U/Pb and 40Ar/39Ar Dating of the Pre-Dzhugdzhur 
Volcanics: New Evidence of Time Diversity in the Formation of 
Individual Sectors of the Okhotsk–Chukotka Volcanogenic Belt
V. F. Polin, P. L. Tikhomirov, Academician A. I. Khanchuk 
and A. V. Travin 
p. 273  

Geology of Ore Deposits

Late Paleozoic Age of Intrusive Rocks from the “Trondhjemite” 
Massif of the Tyrnyauz W–Mo Deposit (North Caucasus, Russia): 
The First Results of U–Pb Isotope Dating of Zircon (LA–ICP–MS Method)
S. G. Soloviev, S. G. Kryazhev, D. V. Semenova, 
Yu. A. Kalinin and Academician N. S. Bortnikov 
p. 281  

Geochemistry

Positive δ13C Anomaly and Sr Isotope Composition in 
Paleoproterozoic Limestone of the Tim Formation 
within the Kursk Block, Sarmatia
K. A. Savko, Corresponding Member of the RAS 
A. B. Kuznetsov, M. Yu. Ovchinnikova and A. Yu. Kramchaninov 
p. 286  

Steroid Phytohormones in Coal Deposits: a Geochemical 
Bridge between Ancient and Modern Plants
Foreign Member of the RAS R. G. Garetsky, A. V. Baranovsky, 
V. N. Zhabinskii, R. P. Litvinovskaya, A. G. Pryadko, 
A. L. Sauchuk, S. A. Fatykhava, V. A. Khripach and 
P. S. Shabunya 
p. 291  

Redox State of Tektites from Different Scattering Fields: 
Evidence from the Data of Electrochemical Study of 
Intrinsic Oxygen Fugacity
O. A. Lukanin, E. V. Zharkova and V. G. Senin 
p. 295  

Mineralogy

Sulfide-Bearing Polymineralic Inclusions in Mantle-Derived 
Garnets from Lamprophyres of the Chompolo Field 
(Central Aldan, Siberian Craton)
E. I. Nikolenko, I. S. Sharygin, D. I. Rezvukhin, 
V. G. Malkovets, N. S. Tychkov and Academician N. P. Pokhilenko 
p. 300  

The Pseudobrookite Group: Crystal Chemical Features 
of the Armalcolite Fe2+ Analogue
O. N. Kazheva, N. V. Zubkova, Ch. Schäfer, N. V. Chukanov, 
Corresponding Member of the RAS I. V. Pekov, S. N. Britvin 
and Academician of the RAS D. Yu. Pushcharovsky 
p. 305  

Geophysics

Ionic Composition of the Earth’s Exosphere during a 
Reversal of the Solar Magnetic Field
M. S. Ivanov and V. B. Lapshin 
p. 310  

Estimates of Direct Radiative Forcing Impact on 
Surface Air Temperature Changes in the Modern Period
Corresponding Member of the RAS V. A. Semenov 
and M. A. Aleshina 
p. 314  

Diffuse-Interface Simulation of Wave Fields in Porous Media
G. V. Reshetova and E. I. Romensky 
p. 319  

Seismology

Peculiarities of the Seismic Activation of 
Avacha Volcano in Late 2019
P. P. Firstov, A. A. Shakirova, A. P. Maksimov 
and E. V. Chernykh 
p. 323  

Oceanology

Alongshore Fluxes of Sand Sediments in the Region 
of Propagation of Tropical Cyclones 
(Example of the Hicacos Peninsula, Cuba)
B. V. Divinsky, N. N. Dunaev and R. D. Kosyan 
p. 328  

Dynamics of Sedimentary Waves over the Western 
Slope of the Caspian Sea
A. K. Ambrosimov and Academician A. P. Lisitsyn 
p. 341  

Land Water Problems

Nonlinear Effects in the Formation of Water Quality
Corresponding Member of the RAS V. I. Danilov-Danilyan 
and O. M. Rosenthal 
p. 345  

Geoecology

Variations in the Aboveground Phytomass in 
Northern Eurasia in the 21st Century
Corresponding Member of the RAS A. A. Tishkov, 
A. N. Krenke, S. V. Titova, E. A. Belonovskaya 
and N. G. Tsarevskaya 
p. 348