Tectonic Position of the South Anyui Suture

Geotectonics ◽  
2021 ◽  
Vol 55 (5) ◽  
pp. 697-716
Author(s):  
S. D. Sokolov ◽  
M. I. Tuchkova ◽  
G. V. Ledneva ◽  
M. V. Luchitskaya ◽  
A. V. Ganelin ◽  
...  
Keyword(s):  
The South ◽  
Tectonic Position ◽  
South Anyui Suture

scholarly journals South Anyui suture: tectono-stratigraphy, deformations, and principal tectonic events

2009 ◽  
Vol 4 ◽  
pp. 201-221 ◽  
Author(s):  
S. D. Sokolov ◽  
G. Ye. Bondarenko ◽  
P. W. Layer ◽  
I. R. Kravchenko-Berezhnoy
Keyword(s):  
Active Continental Margin ◽  
Strike Slip ◽  
Passive Margin ◽  
The South ◽  
Asian Continent ◽  
Oblique Collision ◽  
North Asian Craton ◽  
The North ◽  
Continental Block ◽  
South Anyui Suture

Abstract. Geochronologic and structural data from the terranes of the South Anyui suture zone record a protracted deformational history before, during and after an Early Cretaceous collision of the passive margin of the Chukotka-Arctic Alaska continental block with the active continental margin of the North Asian continent. Preceding this collision, the island arc complexes of the Yarakvaam terrane on the northern margin of the North Asian craton record Early Carboniferous to Neocomian ages in ophiolite, sedimentary, and volcanic rocks. Triassic to Jurassic amphibolites constrain the timing of subduction and intraoceanic deformation along this margin. The protracted (Neocomian to Aptian) collision of the Chukotka passive margin with the North Asian continent is preserved in a range of structural styles including first north verging folding, then south verging folding, and finally late collisional dextral strike slip motions which likely record a change from orthogonal collision to oblique collision. Due to this collision, the southern passive margin of Chukotka was overthrust by tectonic nappes composed of tectono-stratigraphic complexes of the South Anyui terrane. Greenschists with ages of 115–119 Ma are related to the last stages of this collision. The postcollisional orogenic stage (Albian to Cenomanian) is characterized by sinistral strike slip faults and an extensional environment.

Kulpolnei Volcanic Complex of the South Anyui Suture (West Chukotka): Composition, Age, and Paleotectonic Interpretations

2021 ◽  
Vol 499 (1) ◽  
pp. 564-569
Author(s):  
A. V. Moiseev ◽  
M. V. Maskaev ◽  
D. K. Ulyanov ◽  
S. D. Sokolov ◽  
B. V. Belyatsky
Keyword(s):  
Volcanic Complex ◽  
The South ◽  
South Anyui Suture

Tectonics of the South Anyui Suture, Northeastern Asia

Geotectonics ◽  
2015 ◽  
Vol 49 (1) ◽  
pp. 3-26 ◽  
Author(s):  
S. D. Sokolov ◽  
M. I. Tuchkova ◽  
A. V. Ganelin ◽  
G. E. Bondarenko ◽  
P. Layer
Keyword(s):  
The South ◽  
Northeastern Asia ◽  
South Anyui Suture

scholarly journals STRONG SEISMIC EVENTS on the SOUTH-WESTERN FLANK of the BAIKAL RIFT in 2014: November 1, 2014, Кp=13.6, Mw=4.6, I0=7–8 URIK EARTHQUAKE and December 5, 2014, Кp=13.9, Mw=4.9, I0=7–8 HOVSGOL EARTHQUAKE

2020 ◽  
pp. 350-363
Author(s):  
V. Melnikova ◽  
N. Gileva ◽  
A. Seredkina ◽  
Ya. Radziminovich
Keyword(s):  
Normal Fault ◽  
Baikal Rift Zone ◽  
Strike Slip ◽  
Historical Seismicity ◽  
Seismic Events ◽  
The South ◽  
Moment Tensors ◽  
The North ◽  
Western Flank ◽  
Tectonic Position

We consider two earthquakes occurred at the south-western flank of the Baikal rift zone (BRZ): Urik, November 1, 2014 (Mwreg=4.6) and Hovsgol, December 5, 2014 (Mwreg=4.9). First of them is localized within the area of the Main Sayan fault, the second one is located at the north of the Hovsgol Lake. Seismic moment tensors (focal mechanisms, scalar seismic moments, moment magnitudes and hypocentral depths) of the study seismic events were calculated based on surface wave amplitude spectra. Earthquake hypocenters were found to be situated in the middle crust (h=14–21 km). Both events occurred under the strike-slip stress-strain field. The strike-slip was combined with a normal fault component in the source of the Urik earthquake and with a thrust fault component in the source of the Hovsgol earthquake. In both cases, shaking intensity in the nearest settlements (=42–124 km) was less than 4–5. Analysis of historical seismicity, seismological data on the Urik and Hovsgol earthquakes and the tectonic position of their sources demonstrates that the considered events are typical for the south-western flank of the BRZ and confirms the existence of the transition zone from rift structures at the central parts of the BRZ to regional compression structures in Northern Mongolia.

Tectonic position and origin of volcanosedimentary rocks of the Polyarnyi Uplift (South Anyui Suture, Western Chukotka)

2006 ◽  
Vol 411 (1) ◽  
pp. 1199-1203 ◽  
Author(s):  
S. D. Sokolov ◽  
G. E. Bondarenko ◽  
M. I. Tuchkova ◽  
P. Leyer
Keyword(s):  
Tectonic Position ◽  
South Anyui Suture

Tectonic implications of the metamorphic field gradient in the Austrian Drosendorf and Gföhl units, Moldanubian Zone

2020 ◽  
Author(s):  
Dominik Sorger ◽  
Christoph A. Hauzenberger ◽  
Manfred Linner ◽  
Fritz Finger ◽  
Harald Fritz
Keyword(s):  
Variscan Orogeny ◽  
Duplex Structure ◽  
The South ◽  
Mafic Rocks ◽  
Moldanubian Zone ◽  
Second Stage ◽  
The North ◽  
Tectonic Position ◽  
Lower Crustal ◽  
Comprehensive Study

<p>The Moldanubian Zone in Austria is traditionally subdivided into several tectonostratigraphic subunits, which were juxtaposed to their nowadays position during the Variscan orogeny. The Gföhl unit at the highest tectonic position exposes the Moldanubian granulites at the top, underlain by the granitic Gföhl orthogneiss. At its base lies the Raabs unit, a sequence of mafic rocks (amphibolites and sepentinites) accompanied by metasediments. The Drosendorf unit represents a sedimentary sequence mainly consisting of paragneisses, amphibolites and marbles. At the lowest position the Ostrong unit is dominated by low-P paragneisses with local appearances of eclogites.<br>A comprehensive study along four W–E profiles from the Danube valley (P1) in the south, to the Thaya valley (P4) in the north, revealed a disparate distribution of metamorphic conditions within the Drosendorf and the Gföhl units (Raabs unit and Gföhl orthogneiss). Along P1 several lithologies of the investigated units show similar P–T conditions of 0.8–1.2 GPa and 750–800 °C, followed by a decompression stage to 0.6–0.8 GPa and ~750 °C. Towards the north the temperature within the Drosendorf unit is continuously decreasing to 650–700 °C, at pressure conditions of 0.4–0.8 GPa. P–T conditions for Raabs unit and Gföhl orthogneiss are decreasing as well but are increasing again at P4. At the western end of P4 they reach similar conditions as in P1 (0.6–1.0 GPa and 725–800), but a decrease towards the east can be observed. A slight W–E decreasing trend is also observable in P2 and P3. Th–U–Pb microprobe dating of several metasedimentary and orthogneiss samples resulted in a Carboniferous age (~340 Ma) for metamorphism. At one locality in the south an older monazite generation indicates an incipient collisional metamorphism in the Devonian (~370 Ma).<br>The observed N–S gradient indicates that the southern parts represent formerly deeper buried lower crustal parts, whereas towards the north middle crustal levels are exposed, which were exhumed in a first stage. In a second stage of exhumation in the northernmost area, the oblique thrusting of lower crustal segment including the Gföhl unit onto the already exhumed lower-middle crustal parts caused the formation of a duplex structure, which is responsible for the present appearance of the area around the Drosendorf window.</p>

Presidential Republicanism in the South, 1960

1962 ◽  
Vol 24 (2) ◽  
pp. 303-322 ◽  
Author(s):  
Bernard Cosman
Keyword(s):  
The South

Long-term Cyclic Variations of Prominences, Green and Red Coronae over Solar Cycles

2000 ◽  
Vol 179 ◽  
pp. 201-204
Author(s):  
Vojtech Rušin ◽  
Milan Minarovjech ◽  
Milan Rybanský
Keyword(s):  
Emission Lines ◽  
High Latitudes ◽  
Green Line ◽  
Solar Cycles ◽  
The South ◽  
Coronal Emission ◽  
Local Maxima ◽  
The North ◽  
Cyclic Variations

AbstractLong-term cyclic variations in the distribution of prominences and intensities of green (530.3 nm) and red (637.4 nm) coronal emission lines over solar cycles 18–23 are presented. Polar prominence branches will reach the poles at different epochs in cycle 23: the north branch at the beginning in 2002 and the south branch a year later (2003), respectively. The local maxima of intensities in the green line show both poleward- and equatorward-migrating branches. The poleward branches will reach the poles around cycle maxima like prominences, while the equatorward branches show a duration of 18 years and will end in cycle minima (2007). The red corona shows mostly equatorward branches. The possibility that these branches begin to develop at high latitudes in the preceding cycles cannot be excluded.

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