scholarly journals Two genetic types of pseudotachylytes

2019 ◽  
Vol 484 (5) ◽  
pp. 589-594
Author(s):  
Yu. A. Morozov ◽  
M. A. Matveev ◽  
A. I. Smulskaya ◽  
A. L. Kulakovskiy
Keyword(s):  
Barents Sea ◽  
Rapid Rise ◽  
Genetic Types ◽  
The Barents Sea ◽  
Granite Type ◽  
Initial Melting ◽  
Original Rock ◽  
Exclusive Processes ◽  
Frictional Melting ◽  
Sea Coast

The study of two varieties of pseudotachylytes (PST) in granitoids of the Riphean complex on the Barents Sea coast of the Kola Peninsula (Rybachii and Srednii peninsulas) and in metapsammite of the Paleoproterozoic complex in the Northern Ladoga region by a few independent analytical methods has made it possible to establish that they belong to different genetic forms, such as mechanically crushed rocks and melting products, respectively. As for the melting differences, we have given a detailed description of the mineral and material transformations of the original rock into the PST glass matrix and obtained evidence for the initial melting out of the micaceous eutectics with its subsequent shift to the granite type. The conclusion has been made on the most likely formation of molten PST due to frictional rock melting under rapid rise of its blocks from a depth of 12–15 km to the crustal surface (less than 3 km) along the faults of presumably seismogenic nature. It is suggested that crushing and frictional melting can be complementary, rather than mutually exclusive processes, and the formation of molten PST is commonly preceded by the mechanical rock crushing stage.

Heavy metals in the atmospheric precipitation on the Barents Sea coast

2010 ◽  
Vol 35 (5) ◽  
pp. 333-340 ◽  
Author(s):  
N. I. Golubeva ◽  
L. V. Burtseva ◽  
V. A. Ginzburg
Keyword(s):  
Heavy Metals ◽  
Barents Sea ◽  
Atmospheric Precipitation ◽  
The Barents Sea ◽  
Sea Coast

Soil microfungi of the Barents Sea coast (near Varandey settlement)

2009 ◽  
Vol 43 ◽  
pp. 113-121
Author(s):  
I. Yu. Kirtsideli
Keyword(s):  
Barents Sea ◽  
Trichoderma Viride ◽  
High Concentration ◽  
Acremonium Strictum ◽  
The Barents Sea ◽  
The Media ◽  
Soil Dilution ◽  
Geomyces Pannorum ◽  
Soil Microfungi ◽  
Sea Coast

The paper is a report of soil microfungi of the Barents Sea coast. 49 species of saprotrophic filamentous microfungi belonging to 22 genera were isolated by soil dilution methods from three tundra locations. 82-89% of strains were psychrophiles and psychrotrophs. 76-92% of isolates had tolerance to high concentration of NaCl in the media. Geomyces pannorum (Pseudogymnoascus roseus), Penicillium chrysogenum, P. expansum and Trichoderma viride were most often in these soil samples in all habitats studied. The microfungi Acremonium strictum and Phoma sp. were very frequent in different peat-bog habitats.

Epilithic lichens and their morphological adaptations to the conditions of the White and Barents Seas coast (Russian Arctic)

2012 ◽  
Vol 2 (2) ◽  
pp. 109-116 ◽  
Author(s):  
Anzhella V. Sonina
Keyword(s):  
Species Composition ◽  
Barents Sea ◽  
White Sea ◽  
Lichen Species ◽  
The White Sea ◽  
The Barents Sea ◽  
Lichen Cover ◽  
Functional Features ◽  
Epilithic Lichens ◽  
Sea Coast

The main aim of our work was to investigate the biodiversity of coastal lichens, conditions of lichen cover formation, and study the structural and functional adaptations of Lecanora intricata (Ach.) Ach. and L. polytropa (Ehrh. ex Hoffm.) Rabenh. The investigation was carried out during 2008-2012 on cliffs both along the Murmansk (the Barents Sea) coast and the southern and western shores of the White Sea. For the evaluation of species composition, and ecotopic coenotical features of epilithic lichen growing on cliffs, the geobotanical methods have been used. In addition, the anatomical, morphological and biochemical studies of Lecanora intricata and L. polytropa have been made. 91 species have been included in the total list of lichens on the White Sea coast. On the Murmask coast of the Barents Sea, 36 lichen species had revealed. On the coastal territory, the epilithic lichens inhabit the upper littoral and supralittoral zone. The lichen cover is formed by two interacting factors: the water factor (sea) and the terrestrial vegetation. Four lichen zones were distinguished in the all studying territories. They differed by the lichen species composition and effect of the sea. The first lichen’s zone is the intrazonal structure in the complex coastal lichen cover. In Lecanora polytropa and L. intricata, structural and functional features of lichens for adaptation to unstable coastal conditions were identified. The crustose biomorphs were better adapted to temperature and degree of hydration of thalli. Formation of the smallest ascospores is reproductive strategy of epilithic lichens in extreme habitats. High content of usnic acid in the studied lichen thalli allows them to exist in the open areas exposed to solar radiation and provides the biotic regulation that affects the structure of lichen cover. Optimal ratio of algal to fungal components in the thalli of these species is necessary to maintain their life in extreme environments.

scholarly journals Paleoecological characteristics of the Barents sea coast during the late holocene by the example of Sredniy Peninsula

2018 ◽  
Vol 64 (4) ◽  
pp. 391-406
Author(s):  
T. V. Sapelko ◽  
E. S. Nosevich ◽  
M. A. Kulkova ◽  
A. I. Murashkin ◽  
E. M. Kolpakov
Keyword(s):  
Late Holocene ◽  
Barents Sea ◽  
Temperature Drop ◽  
The Barents Sea ◽  
Tundra Vegetation ◽  
Functional Zones ◽  
Radiocarbon Data ◽  
House Structure ◽  
Metal Age ◽  
Sea Coast

We received results of complex palaeoecological research at south-west Barents Sea coast. In Periayarvi 1 settlement (Sredniy Peninsula) discovered by V. Ya. Shumkin in 1994, archeological excavations of two house-structures were performed. We sampled the sequence in the house-structure 16 date to the Early Metal Age and we studied it with archaeological, palynological, geochemical and radiocarbon methods. The sequence in the house-structure 16 settlement include sand layers in the bottom, the upper part consists of slightly decomposed peat. The radiocarbon data obtained from the charcoal sample from the fireplace in the middle of the house-structure is 2920±70 C14 BP, which correlates with result of pollen analysis. According ac to pollen data, the sequence formation started at the first half of the Subboreal period during the spread of tundra vegetation and then vegetation changed to forest tundra while the climate was getting more comfortable for humans. At the Subatlantic period tundra recovers because of temperature drop. The landscape is getting similar to the modern one. According geochemical indications main functional zones of house-structure were distinguished, and that provides necessary information about main characteristics of living conditions. The complex of methods allows to date Periayarvi 1 settlement to the Early Metal Age. In the results we made reconstruction of palaeoenvironmental conditions in the Late Holocene at the Barents Sea coast.

Thermal regime of permafrost at Varandey Settlement along the Barents Sea Coast, North West Arctic Russia

2018 ◽  
Vol 246 ◽  
pp. 69-81 ◽  
Author(s):  
Thi Minh Hue Le ◽  
Ivan Depina ◽  
Emilie Guegan ◽  
Anatoly Sinitsyn
Keyword(s):  
Thermal Regime ◽  
Barents Sea ◽  
North West ◽  
The Barents Sea ◽  
Arctic Russia ◽  
Sea Coast

Heavy metals and black carbon in the atmosphere over the Barents sea: concentrations and fluxes onto the surface

2021 ◽  
pp. 142-152
Author(s):  
A.A. Vinogradova ◽  
◽  
E.I. Kotova ◽  
Yu.A. Ivanova ◽  
◽  
...  
Keyword(s):  
Heavy Metals ◽  
Black Carbon ◽  
Barents Sea ◽  
Spatial Variations ◽  
Near Surface ◽  
Lead And Cadmium ◽  
The Barents Sea ◽  
The Mean ◽  
Sea Area ◽  
Sea Coast

Estimates of the fluxes of anthropogenic heavy metals (HM) – Pb, Cd, As, Zn, Ni, Cr, Cu – from the atmosphere onto the surface of the Barents Sea are based on previously calculated concentrations of these elements in near-surface atmosphere at three points of the Sea coast (on Kola Peninsula, in Nenets Nature Reserve, on Frantz-Josef Land archipelago). For lead and cadmium, the contributions of their anthropogenic emissions in foreign Europe, as well as of windblowing dust and soil particles have been taking into account(from EMEP reports). About 50% of lead and about 40% of cadmium come from those sources to the whole Sea area. In general, the atmosphere supplies yearly only a fraction of percent of HMs containing in the Barents Sea waters. In spring, during the period of ice melting, the atmospheric contribution to HM concentrations in Sea waters may be 2-10 times higher than average annual values. Also, we studied the spatial variations of black carbon (BC) contentin the atmosphere over the Barents Sea based on satellite data (reanalysis MERRA-2).The mean BC fluxes onto the snowed surface, and respective amendments the surface albedo and its radiation forcing were estimatedfor three regions under investigation.

A rare moss Cynodontium suecicum (Rhabdoweisiaceae, Bryophyta) on the Barents Sea coast of the Kola Peninsula: morphological and molecular study

2021 ◽  
Vol 55 (2) ◽  
pp. 427-438
Author(s):  
O. A. Belkina ◽  
A. A. Vilnet
Keyword(s):  
Kola Peninsula ◽  
Nuclear Dna ◽  
Barents Sea ◽  
Sequence Data ◽  
Molecular Study ◽  
Nucleotide Sequence Data ◽  
The Barents Sea ◽  
Cytoplasmic Dna ◽  
The Stability ◽  
Sea Coast

Specimens of the rare species Cynodontium suecicum (Rhabdoweisiaceae, Bryophyta) were collected near Drozdovka Bay on the Barents Sea coast of the Kola Peninsula (Russia) in 2016. They were compared with samples of C. suecicum from the Teriberka area (also the coast of the Barents Sea) gathered in 1977 by R. N. Schljakov. The morphological features of both groups of samples were studied, and nucleotide sequence data for ITS1-2 nrDNA and trnL-F cpDNA were obtained. Molecular analysis suggested C. suecicum as a hybrid that inherited cytoplasmic DNA from C. tenellum and nuclear DNA from Kiaeria blyttii. Taking into account the rather clear morphological delimitation against other species, combined with the stability of genetic characters, we believe that S. suecicum should be retained as a species-level taxon.

Acidity in organic horizons of arctic soils on the Barents Sea coast

2017 ◽  
Vol 50 (11) ◽  
pp. 1283-1293 ◽  
Author(s):  
E. V. Shamrikova ◽  
S. V. Deneva ◽  
O. S. Kubik ◽  
V. V. Punegov ◽  
E. V. Kyz”yurova ◽  
...  
Keyword(s):  
Barents Sea ◽  
Arctic Soils ◽  
The Barents Sea ◽  
Organic Horizons ◽  
Sea Coast
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