Tectonics and geodynamics of the Central Asian Foldbelt: the role of Late Paleozoic large-amplitude strike-slip faults

2011 ◽  
Vol 52 (1) ◽  
pp. 52-71 ◽  
Author(s):  
M.M. Buslov
Lithosphere ◽  
2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Beihang Zhang ◽  
Jin Zhang ◽  
Heng Zhao ◽  
Junfeng Qu ◽  
Yiping Zhang ◽  
...  

Abstract Strike-slip faults are widely developed throughout the Central Asian Orogenic Belt (CAOB), one of the largest Phanerozoic accretionary orogenic collages in the world, and may have played a key role in its evolution. Recent studies have shown that a large number of Late Paleozoic–Early Mesozoic ductile shear zones developed along the southern CAOB. This study reports the discovery of a NW–SE striking, approximately 500 km long and up to 2 km wide regional ductile shear zone in the southern Alxa Block, the Southern Alxa Ductile Shear Zone (SADSZ), which is located in the central part of the southern CAOB. The nearly vertical mylonitic foliation and subhorizontal stretching lineation indicate that the SADSZ is a ductile strike-slip shear zone, and various kinematic indicators indicate dextral shearing. The zircon U-Pb ages and the 40Ar/39Ar plateau ages of the muscovite and biotite indicate that the dextral ductile shearing was active during Middle Permian to Middle Triassic (ca. 269–240 Ma). The least horizontal displacement of the SADSZ is constrained between ca. 40 and 50 km. The aeromagnetic data shows that the SADSZ is in structural continuity with the coeval shear zones in the central and northern Alxa Block, and these connected shear zones form a ductile strike-slip duplex in the central part of the southern CAOB. The ductile strike-slip duplex in the Alxa Block, including the SADSZ, connected the dextral ductile shear zones in the western and eastern parts of the southern CAOB to form a 3000 km long E-W trending dextral shear zone, which developed along the southern CAOB during Late Paleozoic to Early Mesozoic. This large-scale dextral shear zone was caused by the eastward migration of the orogenic collages and blocks of the CAOB and indicates a transition from convergence to transcurrent setting of the southern CAOB during Late Paleozoic to Early Mesozoic.


2021 ◽  
Vol 66 (1) ◽  
pp. 115-121
Author(s):  
KSENIA G. MURATSHINA ◽  
◽  
EVGENY L. BAKHTIN ◽  

Youth exchanges have become an essential component of people-to-people exchanges in international relations, both in bilateral and multilateral formats. This paper analyses the participation of Russia and its Central Asian partners (Kazakhstan, Kyrgyzstan, Tajikistan and Uzbekistan) in youth exchanges in the Shanghai Cooperation Organisation. The authors consequently discuss the institutional structure and formats of the multilateral cooperation, its development within the last decade, and the representation and role of the member states. The research is based on the study of the SCO multilateral documents, SCO institutions’ documentation, official addresses and interviews of the SCO politicians and NGO leaders, online news archives of NGOs and media. The authors conclude that the SCO has formed a multilateral cooperation mechanism for youth exchanges, in which Russia and Central Asia are fully represented, with minor exclusions. Meanwhile, the cooperation demonstrates the evident rivalry between Russia and China in this cooperation. The Central Asian countries have become subject to this rivalry, however, at the same time they have already started to put forward their own initiatives, too, which can be significant for the development of multilateral dialogue. Finally, the paper discusses the potential benefits of cooperation for its participants.


2021 ◽  
Vol 17 (4) ◽  
pp. 34-45
Author(s):  
V.N. Galyapina

More than 400 thousand Russians remain in Kyrgyzstan and Tajikistan after the collapse of the USSR. They have to adapt to the changing conditions, and it is important to study the factors that determine their psychological well-being. This study focuses on the moderating role of perceived security in the relationship between acculturation attitudes and psychological well-being of the Russians in the two Central Asian countries. The sample included 578 respondents. In the study, we used scales from the MIRIPS questionnaire and carried out analysis using the moderation models 1 and 3. The results showed that for the Russians in both countries, when perceived security was low, separation attitudes promoted self-esteem, while assimilation attitudes decreased it. The study also revealed the role of the context: in Tajikistan (less favorable context for the Russians), assimilation attitudes contributed to life satisfaction in situations of high perceived security, while in Kyrgyzstan (more favorable context) it was integration attitudes that determined life satisfaction when perceived security was high or medium. We may conclude that the context determines the preference of acculturation strategy that provides the Russians with life satisfaction in the situation of perceived security: the assimilation strategy in Tajikistan, and the integration strategy in Kyrgyzstan.


2019 ◽  
Author(s):  
Sarawute Chantraprasert ◽  
Jakkree Kongchum ◽  
Natapol Kuenphan
Keyword(s):  

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