Actual problems of studies of recent platform structures: A case study of the East European Craton and adjacent parts of the Scythian Plate

This article deals with the topical problems related to studies of recent tectonic structures of the East European Craton and Scythian Plate. These are, in particular, broad development of cover formations above neotectonic structures (such covers complicate the estimation of amplitudes of tectonic movements); discontinuous distribution and insufficient degree of preservation of deposits correlative to the recent stage; overestimated denudation cut from recent uplifts; different points of view on the type of structural forms (block or bend); character and type of boundaries between structural forms; neotectonic implications of buried valleys; change of structural plans during the recent stage; and geodynamic conditions and sources of tectonic stresses during the formation of recent structures.     

On the Distance to Nearby Dwarf Galaxy NGC 1569

We present stellar photometry of two HST/WFPC2 fields situated at the far periphery of the poststarburst galaxy NGC 1569. Their F606W and F814W images have been taken from the HST data archive. Judging by the obtained color-magnitude diagrams, we suggest presence of the old disk population (old red giants) of NGC 1569, which extends as far as Field I at 6 kpc from the galaxy center. We use the tip of the red giant branch to estimate the galaxy distance. There are two possible solutions, one leading to a short distance, D = 1.95 ± 0.2 Mpc, and the other one to a longer distance, D = 2.8 ± 0.2 Mpc.     

Rare and Rare Earth Elements in Lateritized Bauxites of the Chadobets Uplift (Siberian Platform)

Doklady Earth Sciences - The mineral and chemical composition of bauxites from the Chadobets uplift of the Siberian Platform is the total product of laterites on aluminosilicate rocks (source of...     

The central region of NGC 3077: ground‐based photometry and age of bright ‘starlike’ objects

We present UBVI_C photometry of starlike objects in the central region of NGC 3077. The colour‐colour and colour‐magnitude diagrams of the objects are discussed. Many of the objects under consideration, starlike from the ground, are probably dense young star clusters (super star clusters, SSC). Ages spreading over ∼4 to ∼150 Myr are estimated for most of these objects. Sakai and Madore (2001) found enhanced star formation ∼30–125 Myr ago also in the halo of this galaxy; thus, high star forming activity has occurred within the entire galaxy (centre and halo) since ∼130…150 Myr. Having ended in the outer regions about 30 Myr ago, it is going on near the centre with full vigour. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Tropical Cyclones and Their Transformation into Extratropical: Estimates of the Half-Century Trends

Doklady Earth Sciences - Results from an analysis of the frequency of tropical cyclones, the probability of their transformation into extratropical cyclones, and their trends in different oceanic...     

Ground-Based Measurements of the Total Column of Freons in the Atmosphere near St. Petersburg (2009–2017)

The results of the first long-term (2009–2017) ground-based spectroscopic measurements of the total content (TC) of a number of freons in Russia are presented. According to measurements in Peterhof, TCs of CFC-11 and CFC-12 decrease at a rate of ~0.6% per year and TC of HCFC-22 grows at a rate of ~2.7% per year, which is in good agreement with independent measurements. The seasonal course of freon TC in the area of St. Petersburg is registered: highs of CFC-11 and CFC-12 are observed in summer and lows are in late winter and spring. For the HCFC-22 TC, the opposite seasonal course is observed, with a maximum in winter and a minimum in summer.     

The World’s Largest Fouta Djallon–Mandingo Bauxite Province (West Africa): Part III. The Influence of Geomorphic Factors and the Age of Relief on the Spatial Distribution,Size, and Quality of Bauxite Deposits

Geology of Ore Deposits - The scheme of geomorphic evolution of the region was substantially refined, compared to the previous understanding, based on the results of geologic and geomorphic...