Gas–oil fluids in the formation of travertines in the Baikal rift zone

Active participation of gas–oil fluids in the processes of mineral formation and petrogenesis in travertines of the Arshan and Garga hot springs is substantiated. The parageneses of the products of pyrolytic decomposition and oxidation of the gas–oil components of hydrothermal fluids (amorphous bitumen, graphite-like CM, and graphite) with different genetic groups of minerals crystallized in a wide range of P–T conditions were established. Travertines of the Baikal rift zone were formed from multicomponent hydrous–gas–oil fluids by the following basic mechanisms of mineral formation: chemogenic, biogenic, cavitation, fluid pyrometamorphism, and pyrolysis.     

Bacterial communities in Hoito Gol hot spring,Eastern Sayan,and the ecologic-geological conditions of their development

Hoito Gol hot spring of weakly mineralized warm (36–29°C) neutral and partly alkaline nitrogen-carbon dioxide waters belongs to the hydrogeological structure of the actively water-flooded fault marked by the Sentsy River at the southwestern termination of the Baikal rift system. The spatiotemporal evolution of the major parameters of the underground aqueous ecosystem of this spring is controlled mainly by geological and geodynamic factors, whereas the parameters of the surface system are determined mostly by bacterial factors. Variations in these factors are correlated with changes in the composition, structure, and spatial distribution of the bacterial communities.     

Strong-Earthquake-Prone Areas Recognition Based on an Algorithm with a Single Pure Training Class: I. Altai–Sayan–Baikal Region, М ≥ 6.0

Izvestiya, Physics of the Solid Earth - A new version of the Barrier algorithm is proposed for recognition of strong-earthquake prone regions based on training over a single reliable training...     

Effect of Surface Heterogeneity on the Boundary-Layer Height: A Case Study at a Semi-Arid Forest

We investigate the effects of an isolated meso-\(\gamma \)-scale surface heterogeneity for roughness and albedo on the atmospheric boundary-layer (ABL) height, with a case study at a semi-arid forest surrounded by sparse shrubland (forest area: \(28~\text{ km }^2\), forest length in the main wind direction: 7 km). Doppler lidar and ceilometer measurements at this semi-arid forest show an increase in the ABL height over the forest compared with the shrubland on four out of eight days. The differences in the ABL height between shrubland and forest are explained for all days with a model that assumes a linear growth of the internal boundary layer of the forest through the convective ABL upwind of the forest followed by a square-root growth into the stable free atmosphere. For the environmental conditions that existed during our measurements, the increase in ABL height due to large sensible heat fluxes from the forest (\(600~\text {W~m}^{-2}\) in summer) is subdued by stable stratification in the free atmosphere above the ABL, or reduced by high wind speeds in the mixed layer.     

GIS-Oriented Database for the System Analysis and Prediction of the Geodynamic Stability of the Nizhne-Kansky Massif

Izvestiya, Atmospheric and Oceanic Physics - In 2019, the construction of an underground research laboratory for justifying the geoecological safety of the disposal of highly active radioactive...     

New types of gold-bearing structures and rocks in ore fields of the western Mongolia-Okhotsk collisional suture

The Kariisky, Pil’nensky, and Pogromny gold deposits of the Shilka branch and the Ilinsky and Dybyksinsky deposits of the Onon-Tura branch of the Mongolia-Okhotsk Suture belong to the nappe-thrust type of ore fields. New types of gold-bearing structural elements are tectonic polymictic melange, serpentinite melange, autoclastic melange, losange (rhomb-shaped strike-slip duplexes), and mineralized sutures of low-amplitude thrust faults and detachments. It was established that such rocks of the dynamometamorphic complex as mylonites, cataclasites, pseudotachylites, and tectonic breccias may be gold-bearing.     

The Velocities of Modern Horizontal Movements of Earth Crust in the South Sector of Yenisei Ridge According to GNSS Observations

Doklady Earth Sciences - The paper presents the results of GNSS observations, provided by the authors in 2010-2019 years, in the zone of contact of tectonic structures of the Siberian platform,...