scholarly journals Tectonic position of the neoproterozoic gabbro-hyperbasite and gabbroid complexes of the Bayannur block of the Songino ledge, Central Asian orogenic belt

2019 ◽  
Vol 27 (2) ◽  
pp. 31-51
Author(s):  
I. K. Kozakov ◽  
D. A. Lykhin ◽  
Ch. Erdenegargal ◽  
E. B. Salnikova ◽  
I. V. Anisimova ◽  
...  
Keyword(s):  
Siberian Platform ◽  
Lower Boundary ◽  
Crystalline Rocks ◽  
Junction Zone ◽  
Thrust Faults ◽  
Tectonic Plate ◽  
Tectonic Plates ◽  
Central Asian ◽  
Tectonic Position ◽  
Age Limit

The Early Caledonian folded region of the southern framing of the Siberian platform between Dzavkhan and Tuva-Mongolian terranes contains blocks of Songino ledge crystalline rocks. In the Bayannur block of the southern part of the Songino ledge, Neoproterozoic (890–780 Ma) gneiss-migmatitic Bayannur and metaterrigenous-volcanogenic Kholbonure complexes are selected. The zone of their junction is traced by thrust structures, which are reflected in all structural and real complexes of the Bayannur block. At the junction zone, tectonic plates are presented. Their peculiarity is the presence of rocks formed before the formation of the gabbro-hyperbasite complex and post-thrust gabbroids and gabbro-diorites. The upper age limit of the interval of the formation of thrust faults is defined by Bayannur pluton granitoids with age of 790 ± 3 Ma and gabbroids and anorthosites of Onzula tectonic plate with ages of 785 ± 3 and 784 ± 3 Ma. The lower boundary of the formation of thrust faults is determined by the age of Bayannur complex ultrametamorphic granitoids (802 ± 6 Ma). Bodies of massive (post-thrust) pegmatoid gabbro and rocks of gabbro-hyperbasite complex with clearly manifested structures associated with the thrusts are recognized in the tectonic plate of the ridge overlooking the area of Mount San Node. These rocks are dated at 782 ± 2 and 806 ± 10 Ma, respectively (ID TIMS). The obtained data indicate that the post-thrust and before-thrust formations can not be parts of a single stratified complex. The latter can be considered as fragments of paleooceanic formations in the accretion structure of the Bayannur block of the Songino ledge.

Early Precambrian crystalline complexes of the Central Asian microcontinent: Age, sources, tectonic position

2007 ◽  
Vol 15 (2) ◽  
pp. 121-140 ◽  
Author(s):  
I. K. Kozakov ◽  
E. B. Sal’nikova ◽  
T. Wang ◽  
A. N. Didenko ◽  
Yu. V. Plotkina ◽  
...  
Keyword(s):  
Early Precambrian ◽  
Central Asian ◽  
Tectonic Position ◽  
Crystalline Complexes Of

Age and tectonic position of the Stanovoi metamorphic complex in the eastern part of the Central Asian Foldbelt

Geotectonics ◽  
2017 ◽  
Vol 51 (4) ◽  
pp. 341-352 ◽  
Author(s):  
S. D. Velikoslavinskii ◽  
A. B. Kotov ◽  
V. P. Kovach ◽  
E. V. Tolmacheva ◽  
A. A. Sorokin ◽  
...  
Keyword(s):  
Metamorphic Complex ◽  
Central Asian ◽  
Tectonic Position

Mesozoic age of the Gilyui Metamorphic Complex in the junction zone of the Selenga–Stanovoi and Dzhugdzhur–Stanovoi superterranes, Central Asian fold belt

2016 ◽  
Vol 468 (2) ◽  
pp. 561-565 ◽  
Author(s):  
S. D. Velikoslavinskii ◽  
A. B. Kotov ◽  
V. P. Kovach ◽  
A. M. Larin ◽  
A. A. Sorokin ◽  
...  
Keyword(s):  
Junction Zone ◽  
Metamorphic Complex ◽  
Central Asian Fold Belt ◽  
Fold Belt ◽  
Central Asian

Middle–Upper Cambrian Trilobites of the Genus Nganasanella Rosova, 1963 and Their Stratigraphic Significance

2021 ◽  
Vol 62 (07) ◽  
pp. 746-764
Author(s):  
A.L. Makarova
Keyword(s):  
Siberian Platform ◽  
Type Species ◽  
Lower Boundary ◽  
River Section ◽  
Shallow Marine ◽  
Upper Cambrian ◽  
Regional Stage ◽  
Stratigraphic Position ◽  
Marine Facies ◽  
Stratigraphic Chart

Abstract —This paper presents a revision for the genus Nganasanella Rosova, 1963, first described in the stratotype of the Kulyumbean Regional Stage of the Kulyumbe River section (northwest of the Siberian Platform). This section is typical of the upper Cambrian sediments of the Kotuy–Igarka facies region, formed in a shallow marine shelf. As shown by the study, the genus comprises seven species. The species N. nganasanensis Rosova, 1963 (type species), N. tavgaensis Rosova, 1963, N. glabella (Kobayashi), 1943, N. granulosa Rosova et Makarova, 2009, and N. vernacula Rosova et Makarova, 2009 are found in the Siberian Platform. The species N. australica sp. nov. occurs in northeastern Australia. The species N. trisulcatus (Ergaliev), 1980 is widespread in southern Kazakhstan. Some species (N. granulosa and N. vernacula) are found in open marine facies sediments along with the cosmopolitan agnostid species Glyptagnostus reticulatus (Angelin), 1851, serving as a marker of the lower boundary of upper Cambrian strata in the International Chronostratigraphic Chart and the General Stratigraphic Chart of Russia. The species N. trisulcatus and N. australica are found slightly above Glyptagnostus reticulatus. Representatives of the genus Nganasanella are a link between strata of different facies containing different trilobite associations. Their stratigraphic position can serve as an argument for the correlation of the Kulyumbean Regional Stage with units containing Glyptagnostus reticulatus, i.e., the Omnian and Idamean regional stages, the lower parts of the Kutugunian Horizon and the Sakian Regional Stage, and the Paibian Stage of the International Chronostratigraphic Chart.

Plate tectonic modelling: review and perspectives

2018 ◽  
Vol 156 (2) ◽  
pp. 208-241 ◽  
Author(s):  
CHRISTIAN VÉRARD
Keyword(s):  
Plate Boundaries ◽  
Dual Control ◽  
Plate Tectonic ◽  
Joint Effort ◽  
Tectonic Plate ◽  
Deep Time ◽  
Tectonic Plates ◽  
Control Approach ◽  
New Frontier ◽  
Tectonic Boundaries

AbstractSince the 1970s, numerous global plate tectonic models have been proposed to reconstruct the Earth's evolution through deep time. The reconstructions have proven immensely useful for the scientific community. However, we are now at a time when plate tectonic models must take a new step forward. There are two types of reconstructions: those using a ‘single control’ approach and those with a ‘dual control’ approach. Models using the ‘single control’ approach compile quantitative and/or semi-quantitative data from the present-day world and transfer them to the chosen time slices back in time. The reconstructions focus therefore on the position of tectonic elements but may ignore (partially or entirely) tectonic plates and in particular closed tectonic plate boundaries. For the readers, continents seem to float on the Earth's surface. Hence, the resulting maps look closer to what Alfred Wegener did in the early twentieth century and confuse many people, particularly the general public. With the ‘dual control’ approach, not only are data from the present-day world transferred back to the chosen time slices, but closed plate tectonic boundaries are defined iteratively from one reconstruction to the next. Thus, reconstructions benefit from the wealth of the plate tectonic theory. They are physically coherent and are suited to the new frontier of global reconstruction: the coupling of plate tectonic models with other global models. A joint effort of the whole community of geosciences will surely be necessary to develop the next generation of plate tectonic models.

Tectonic Position of the Neoproterozoic Gabbro-Ultrabasite and Gabbroid Complexes of the Bayan Nuur Block of the Songino Ledge, Central Asian Orogenic Belt

2019 ◽  
Vol 27 (2) ◽  
pp. 159-180 ◽  
Author(s):  
I. K. Kozakov ◽  
D. A. Lykhin ◽  
Ch. Erdenegargal ◽  
E. B. Salnikova ◽  
I. V. Anisimova ◽  
...  
Keyword(s):  
Orogenic Belt ◽  
Central Asian Orogenic Belt ◽  
Central Asian ◽  
Tectonic Position

scholarly journals An Analysis of the Eurasian Tectonic Plate Motion Parameters Based on GNSS Stations Positions in ITRF2014

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6065
Author(s):  
Marcin Jagoda ◽  
Miłosława Rutkowska
Keyword(s):  
Terrestrial Reference Frame ◽  
Plate Motion ◽  
Time Interval ◽  
Estimation Of Parameters ◽  
Eurasian Plate ◽  
Tectonic Plate ◽  
Angular Rotation ◽  
Tectonic Plates ◽  
Common Solution ◽  
Motion Parameters

The article is the fourth part of our research program concerning an analysis of tectonic plates’ motion parameters that is based on an observation campaign of an array of satellite techniques: SLR, DORIS, VLBI, and now GNSS. In this paper, based on the International Terrestrial Reference Frame 2014 (ITRF2014) for observations and using the GNSS technique, the Eurasian tectonic plate motion was analyzed and the plate motion parameters Φ, Λ (the position of the rotation pole), and ω (the angular rotation speed) were adjusted. Approximately 1000 station positions and velocities globally were obtained from the GNSS campaign over a 21-year time interval and used in ITRF2014. Due to the large number of data generated using this technique, the analyses were conducted separately for each tectonic plate. These baseline data were divided into a number of parts related to the Eurasian plate, and are shown in this paper. The tectonic plate model was analyzed on the basis of approximately 130 GNSS station positions. A large number of estimated station positions allowed a detailed study to be undertaken. Stations that agree with the plate motion were selected and plate parameters were estimated with high accuracy. In addition, stations which did not agree with the tectonic plate motion were identified and removed. In the current paper, the influence of the number and location of stations on the computed values and accuracy of the tectonic plate motion parameters is discussed. Four calculation scenarios are examined. Each scenario contains 30 stations for the common solution of the European and Asiatic part of the Eurasian plate. The maximum difference between the four calculation scenarios is 0.31° for the Φ parameter and 0.24° for the Λ parameter, indicating that it is at the level of the value of the formal error. The ω parameter has the same value for all the scenarios. The final stage of the analysis is the estimation of parameters Φ, Λ, and ω based on all of the 120 stations used in the four calculation scenarios (i.e., scenario 1 + scenario 2 + scenario 3 + scenario 4). The following results are obtained: Φ = 54.81° ± 0.37°, Λ = 261.04° ± 0.48°, and ω = 0.2585°/Ma ± 0.0025°/Ma. The results of the analysis are compared with the APKIM2005 model and another solution based on the GNSS technique, and a good agreement is found.

The Vendian System of Siberia and a standard stratigraphic scale

1986 ◽  
Vol 123 (4) ◽  
pp. 333-348 ◽  
Author(s):  
V. V. Khomentovsky
Keyword(s):  
Siberian Platform ◽  
Lower Cambrian ◽  
Lower Boundary ◽  
Specific Character ◽  
Type Section ◽  
Composition And Structure ◽  
Upper Stage ◽  
Organic Remains

AbstractIn Siberia Vendian is equated with a Yudoma Complex or Yudomian. Yudomian deposits of the Siberian Platform and adjacent geosynclines differ greatly in facies and thickness. According to the composition and structure of Yudomian deposits, four facies provinces may be recognized on the platform. Local stratigraphic charts for each province are presented and their correlation and possibility to subdivide the Vendian System in Siberia into three horizons or stages are substantiated. The upper stage (Nemakit–Daldyn), on the basis of palaeontological evidence, is in its turn subdivided into two zones: Anabarites trisulcatus and Purella antiqua.The most important Early Baikalian rearrangement is proved to take place around 800±50 Ma. The pre-Vendian (Late Baikalian) movements, though less intensive, make the determination of the Yudomian lower boundary easier.The specific character of Vendian biostratigraphy is discussed involving all groups of the organic remains, that causes the necessity of recognition, subdivision and correlation on the basis of the whole complex of data.The boundary between the Vendian System and the Lower Cambrian Tommotian Stage (in type section) is proved to conform to the base of the Pestrozvet Formation, which divides the A. sunnaginicus and P. antiqua zones.

Sign in / Sign up

Export Citation Format

Share Document