Using Models of the Deep Structure of the Earth’s Crust and Upper Mantle Based on GOCE Gravity Data in Metallogenic Analysis

Izvestiya, Atmospheric and Oceanic Physics - Gravimetric data obtained by the GOCE spacecraft contributes to the development of global models of the deep structure of the Earth’s crust and...     

Territorial zoning for the purpose of reforestation from changes of total ozone content in the atmosphere (exemplified by the Tomsk region)

Based on analyzing and forecasting the reconstructed changes of total ozone content (TOC) in the atmosphere over the Tomsk region, two zones of its changes are identified. It is shown how the capacity for survival of conifer transplant stock can be enhanced on the basis of territorial zoning from TOC changes by varying the time and place of planting.     

Plant Steroid Hormones As Unique Constituents of Devonian Oils of Belarus

Doklady Earth Sciences - The content of plant hormones (brassinosteroids) in oil samples from a number of oilfields in Belarus is determined using an enzyme immunoassay method. Brassinosteroids of...     

Structure of the Pre-Paleozoic Formation of the Central Ural Uplift in the Northern and Subpolar Urals and Its Relation with Gold Production

The Central Ural uplift occupies the near-Vodorazdelnaya part of the Urals. It is composed of metaterrigenous and metavolcanogenic Riphean–Vendian formations. Distributed folds, which formed in several stages, and various tectonic faults are widespread. The study of these structures in the areas located in the Northern and Subpolar Urals showed their lateral and temporal variability, which was reflected in the difference in morphology and nature of faulting. In the Vodorazdelnaya area of the Northern Urals, as a result of thrust–fold deformations, a complex fold structure of the sequence was formed, subsequently broken by two submeridional subparallel faults into blocks. In the Khalmerya area of the Subpolar Urals, there are several tectonic blocks bounded by gently eastward dipping and overlapping tectonic blocks that form a duplex structure. This series of thrust structures created a complex cover structure contrasting in composition and degree of deformation. Later, a northeastern strike-slip fault zone arose. The orientation of early isoclinal folds in the rocks indicates pressure from the northeast, during the formation of tectonic scales and sheets in the Precambrian basement. Then this pressure occurred from the southeast and the Lower Paleozoic sediments were involved in the thrust process. Differences in the features of the formation of structures apparently depend on the morphology of the eastern margin of the East European platform and the change in the vector of displacement of the thrust sheet. The movement of the thrust sheets within the continental margin occurred along the main surface of the fault, with which the thrust structures are articulated at depth. At the final stages, extended strike-slip-upthrust zones were established, which affected the distribution of he gold mineralization.

     

Forms of Gold and Some Typomorphic Characteristics of Native Gold of the Pavlik Orogenic Deposit (Magadan Oblast)

Geology of Ore Deposits - Abstract—The ratios of vein and ore minerals bearing native gold, the shape and size native gold particles, their surface features, variations in chemical...     

The Role of a Detachment Fault in the Spatial Distribution of Ore-Bearing Paleofluid Flows in the Central Kolyma Region: A Nonconventional Approach to Predictive Metallogenic Modeling

Geology of Ore Deposits - The Central Kolyma region is the main gold-bearing part of the Verkhoyansk–Kolyma fold-and-thrust belt. Analysis of the developed geodynamic models of fold and...     

The Muruntau Deposit: Geodynamic Position and a Variant of Genetic Model of the Ore-Forming System

The paper presents the results of original structural studies conducted over a long time within the Kyzylkum ore province and at the Muruntau deposit (Central Asia), including the period when the central part of the deposit, as well as horizons at the eastern and southeastern flanks (abandoned or inaccessible at present), were available to visit. Owing to the geodynamic and structural analysis of the region and the deposit itself, several stages of deformation that created the Muruntau interference structure have been identified. These stages were attributed to the Caledonian (subduction, collision, and transpression regimes), Hercynian (subduction, collision, and transpression regimes), and Cimmerian (transpression regime) cycles of tectonogenesis. The fault–fracture structures of these stages are accompanied by the development of various newly formed (vein–veinlet-metasomatic) mineral assemblages. Based on the averaged characteristics of gold mineralization in various mineral formations, a morphogenetic classification of orebodies was developed and their role in the deposit was revealed. The morphological features of the Main Muruntau ore deposit are considered. A critical review of the results of isochron age dating was made. The subduction–hydrothermal model of the formation of the giant Muruntau gold ore deposit is discussed.     

Model estimates of the eutrophication of the Baltic Sea in the contemporary and future climate

The St. Petersburg Baltic eutrophication model (SPBEM) is used to assess the ecological condition of the sea under possible changes in climate and nutrient loads in the 21st century. According to model estimates, in the future climate water quality will worsen, compared to modern conditions. This deterioration is stronger in the climate warming scenario with a stronger change in future near-surface air temperature. In the considered scenarios of climate change, climate warming will lead to an increase in the area of anoxic and hypoxic zones. Reduction of nutrient loading, estimated in accordance with the Baltic Sea Action Plan, will only be able to partially compensate for the negative effects of global warming.