scholarly journals Local geochemical features of Lower Paleozoic rocks in the area of Duderhof dislocations (North-West of the Russian plate)

LITOSFERA ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 5-22
Author(s):  
E. N. Terekhov ◽  
S. Yu. Kolodyazhny ◽  
A. S. Baluev ◽  
O. I. Okina
Keyword(s):  
Baltic Shield ◽  
Chemical Elements ◽  
Sedimentary Cover ◽  
Black Shales ◽  
Lower Paleozoic ◽  
Near Surface ◽  
North West ◽  
Geochemical Study ◽  
High Concentrations ◽  
The Baltic

Research subject. A geochemical study of Cambrian-Ordovician deposits was carried out within the area of the Duderhof dislocations of the platform cover of the southern frame of the Baltic shield. Materials and methods. The ICP-MS method was used to study 14 samples of sandstones, limestone, phosphorites and black shales, which comprise both weakly dislocated stratified formations (stratified horizons) and strongly deformed formations, as well as secant dome-like and dike-like bodies. Results. Geochemical studies showed that, in the zones of tectonic disturbances, lower Paleozoic deposits are characterized by high concentrations of a number of trace elements, significantly exceeding the Clark values for sedimentary rocks. This applies to such chemical elements, as Be, Sc, V, Co, Ni, Cu, Mo, Pb, Th and U. At the same time, the concentrations of V and U are higher than those in the developed fields of Estonia and Sweden. An analysis of the cambriansands of the sablin formation showed that the eastern (Archean) part of the Baltic shield could not have been the source of food for their formation. The presence of leucoxene in the sands of the Sablinsky formation, a mineral formed by ilmenite under the influence of high temperatures, and the presence of mechanically unstable minerals in dike-like formations, indicate the influence of deep fluids on the sedimentary cover, whose flows moved along fault zones and carried the above-mentioned chemical elements to the near-surface layers of the earth’s crust. All this points to the endogenous rather than exogenous (glacial) nature of secondary structural-material transformations in the area of the Duderhof dislocations, as well as their genetic relationship with deformations in the Baltic-Mezen shear zone.

scholarly journals Deep structure of the Anapa flexural-rupture zone, Western Caucasus

2019 ◽  
pp. 3-11
Author(s):  
E. A. Rogozhin ◽  
A. V. Gorbatikov ◽  
Yu. V. Kharazova ◽  
M. Yu. Stepanova ◽  
J. Chen ◽  
...  
Keyword(s):  
Deep Structure ◽  
Sedimentary Cover ◽  
Western Caucasus ◽  
Tectonic Structures ◽  
Deep Roots ◽  
Near Surface ◽  
North West ◽  
The North ◽  
Deep Faults ◽  
Tectonic Zones

In the period from 2007 to 2017 complex geological and geophysical studies were carried out in the three largest flexural-rupture fault zones in the North-West Caucasus (Anapa, Akhtyrka and Moldavan). The micro-seismic sounding (MSM) was used as the main geophysical method. Studies with the help of MSM allowed us to identify the features of the deep structure of the earth’s crust in the study area and to associate them with specific tectonic structures on the surface.The binding was carried out by harmonizing the results of the MSM and the parameters of the section of the sedimentary cover and crustal boundaries according to the drilling data and the work previously performed by the reflected wave method (MOVZ). It was found that the Anapa flexure and longitudinal tectonic zones have clear deep roots, and also separate the pericline of the North-Western Caucasus from the Taman Peninsula and from the lowered blocks of the Northern slope of the folded system.Faults in the study area are divided into: (1) deep faults of the Caucasian stretch, penetrating into the lower crust and even to the upper mantle, and (2) near-surface faults, do not extend to the depths beyond the thickness of the sedimentary cover. The seismogenic role of these tectonic disturbances in the studied seismically active region has been determined.

K-Ar dating of the Lower Palaeozoic K-bentonites from the Baltic Basin and the Baltic Shield: implications for the role of temperature and time in the illitization of smectite

Clay Minerals ◽  
2009 ◽  
Vol 44 (3) ◽  
pp. 361-387 ◽  
Author(s):  
J. Środoń ◽  
N. Clauer ◽  
W. Huff ◽  
T. Dudek ◽  
M. Banaś
Keyword(s):  
Baltic Shield ◽  
Vitrinite Reflectance ◽  
Sedimentary Cover ◽  
Source Rocks ◽  
X Ray Diffraction ◽  
Baltic Basin ◽  
The North ◽  
Lower Palaeozoic ◽  
Fission Track Ages ◽  
The Baltic

AbstractMixed-layer illite-smectite samples from the Ordovician and Silurian K-bentonites of the Baltic Basin and the Baltic Shield (Norway, Sweden, Denmark, Poland and Estonia) were dated by K-Ar on several grain fractions and were studied by X-ray diffraction (XRD), both on oriented and random preparations, in order to reveal the conditions of smectite illitization in the area. Authigenic K-feldspar was also dated. The geographic pattern of the degree of illitization (% smectite in illite-smectite measured by XRD) is consistent with other indicators of palaeotemperatures (acritarchs, conodont alteration index, vitrinite reflectance, apatite fission track ages). It reveals the highest maximum palaeotemperatures (up to at least 200ºC) along the Norwegian and the German-Polish branches of the Caledonides and the lowest palaeotemperatures (120ºC) in the central part of the studied area. The distribution of K-Ar ages is not well correlated with this pattern, revealing a zone of older ages (Lower Devonian-Lower Carboniferous) between Denmark and Estonia, and areas of younger ages (Upper Devonian to Carboniferous/Permian boundary) to the north and south of this zone. The zone of older ages is interpreted as the result of illitization induced by a thermal event in front of the Caledonian orogenic belt (migration of hot metamorphic fluids?). The areas of younger ages are considered as representing deep burial illitization under a thick Silurian-Carboniferous sedimentary cover, perhaps augmented by a tectonic load. The K-Ar dates invalidate the hypothesis of a long-lasting low-temperature illitization as the mechanism of formation of the Estonian Palaeozoic illite-smectite. The ammonium content of illite-smectite from the Baltic K-bentonites reflects the proximity of organic-rich source rocks that underwent thermal alteration at the time of illite crystallization.

Near-surface earthquakes in the Baltic shield, notably Sweden

1980 ◽  
Vol 68 (3-4) ◽  
pp. T31-T35 ◽  
Author(s):  
Rutger Wahlström
Keyword(s):  
Baltic Shield ◽  
Near Surface ◽  
The Baltic

scholarly journals Shallow and Deep Temperatures in the South-Caspian Basin

2018 ◽  
Vol 1 (1) ◽  
pp. 23-29
Author(s):  
Abdulvahab Sharif Mukhtarov
Keyword(s):  
Sedimentary Cover ◽  
Temperature Data ◽  
The Other ◽  
Temperature Fields ◽  
Local Temperature ◽  
Caspian Basin ◽  
The South ◽  
South Caspian Basin ◽  
Near Surface ◽  
North West

Distribution of shallow and deep temperatures in the sedimentary cover of the South Caspian Basin (SCB) is addressed. Analysis of soil temperature data recorded in meteostations of Azerbaijan and its neighboring regions provide clues as to the temperatures at near surface layers.  Such layers, where seasonal variations of temperatures converge to near-stable values have been designated as the “neutral” layer. In many localities, the bottom parts of such layers extend to depths of around 20 m. In addition, temperature data of over 150 wells, obtained from depths varying from 100 to 6000 m in oil and gas bearing areas of Azerbaijan have been used in assessment of deep temperatures. Data bases were generated for study of lateral temperature fields (in other words, geothermal sections) at depths of 500, 1000, 2000, 3000, 4000, 5000, 6000 and 7000 meters. The results reveal that low temperature areas extend from the north-west to south-east and covers low-lying areas of SCB. Thus, local temperature minimums (30-35°С) are found in Neftchala area, the other larger temperature minimum (35-40°С) covers the structures of Dyvanni-deniz and Here-Zire adasy and expands along the strip Khamamdag deniz, Garasu, Sangi Mugan, Aran deniz. On the other hand, local temperature maximums are observed along the Kura Depression: in Ajinour area with an amplitude of 80°С; to the west of Kyurdamir in Sorsor and Amirarkh areas with an amplitude of 65-70°С; in Sarkhanbeyli-Garabagly-Kyurovdag areas with an amplitude of 60-65°С.

Russian Oil: Production and Exports

2003 ◽  
pp. 136-146
Author(s):  
K. Liuhto
Keyword(s):  
Baltic Sea ◽  
Statistical Data ◽  
Oil Production ◽  
The Baltic Sea ◽  
North West ◽  
The North ◽  
Oil Transportation ◽  
Sea Ports ◽  
The Baltic

Statistical data on reserves, production and exports of Russian oil are provided in the article. The author pays special attention to the expansion of opportunities of sea oil transportation by construction of new oil terminals in the North-West of the country and first of all the largest terminal in Murmansk. In his opinion, one of the main problems in this sphere is prevention of ecological accidents in the process of oil transportation through the Baltic sea ports.

Paleoecological study of bottom sediments of the lake Goluboye (Karelian Isthmus) according to the results of diatom analysis

2019 ◽  
pp. 265-269
Author(s):  
Angelina E. Shatalova ◽  
Uriy A. Kublitsky ◽  
Dmitry A. Subetto ◽  
Anna V. Ludikova ◽  
Alar Rosentau ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Bottom Sediments ◽  
Modern Science ◽  
Karelian Isthmus ◽  
The Baltic Sea ◽  
Diatom Analysis ◽  
North West ◽  
The North ◽  
Important Direction ◽  
The Baltic

The study of paleogeography of lakes is an actual and important direction in modern science. As part of the study of lakes in the North-West of the Karelian Isthmus, this analysis will establish the dynamics of salinity of objects, which will allow to reconstruct changes in the level of the Baltic Sea in the Holocene.

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