Timing of formation of the Keketale Pb-Zn deposit, Xinjiang, Northwest China, Central Asian Orogenic Belt: Implications for the metallogeny of the South Altay Orogenic Belt

2017 ◽  
Vol 53 (3) ◽  
pp. 899-913 ◽  
Author(s):  
Chengdong Yang ◽  
Fuquan Yang ◽  
Fengmei Chai ◽  
Yufeng Wu
Keyword(s):  
Northwest China ◽  
Orogenic Belt ◽  
Central Asian Orogenic Belt ◽  
The South ◽  
Central Asian ◽  
Altay Orogenic Belt

scholarly journals Detrital Zircon Provenance Analysis in the Central Asian Orogenic Belt of Central and Southeastern Mongolia—A Palaeotectonic Model for the Mongolian Collage

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 880
Author(s):  
Wilfried Winkler ◽  
Denise Bussien ◽  
Munktsengel Baatar ◽  
Chimedtseren Anaad ◽  
Albrecht von Quadt
Keyword(s):  
Orogenic Belt ◽  
Detrital Zircons ◽  
Central Asian Orogenic Belt ◽  
Provenance Analysis ◽  
The South ◽  
Central Mongolia ◽  
Basin Inversion ◽  
The North ◽  
Central Asian ◽  
Sandstone Provenance

Our study is aimed at reconstructing the Palaeozoic–early Mesozoic plate tectonic development of the Central Asian Orogenic Belt in central and southeast Mongolia (Gobi). We use sandstone provenance signatures including laser ablation U-Pb ages of detrital zircons, their epsilon hafnium isotope signatures, and detrital framework grain analyses. We adopt a well-established terran subdivision of central and southeastern Mongolia. However, according to their affinity and tectonic assemblage we group them into three larger units consisting of continental basement, rift-passive continental margin and arc elements, respectively. These are in today’s coordinates: (i) in the north the late Cambrian collage from which the later Mongol-Okhotsk and the Central Mongolia-Erguna mountain ranges resulted, (ii) in the south a heterogeneous block from which the South Mongolia-Xin’gan and Inner Mongolia-Xilin belts developed, and (iii) in between we still distinguish the intra-oceanic volcanic arc of the Gurvansayhan terrane. We present a model for paleotectonic development for the period from Cambrian to Jurassic, which also integrates findings from the Central Asian Orogenic Belt in China and Russia. This mobilistic model implies an interplay of rift and drift processes, ocean formation, oceanic subduction, basin inversion, collision and suture formation in space and time. The final assemblage of the Central Asian Orogenic Belt occurred in Early Jurassic.

scholarly journals Early Permian Paleomagnetic Result from the South Beishan (NW China) and Its Implications for the Tectonic Evolution of the SW Central Asian Orogenic Belt

2020 ◽  
Author(s):  
Xin Zhu ◽  
Yan Chen ◽  
Bo Wang ◽  
Stéphane Scaillet ◽  
Michel Faure ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Shear Zones ◽  
Orogenic Belt ◽  
Central Asian Orogenic Belt ◽  
Early Permian ◽  
The South ◽  
Dike Swarm ◽  
Closure Time ◽  
Central Asian ◽  
Final Closure

<p><span>The Beishan Orogenic Belt plays an important role in understanding the Paleozoic tectonic evolution of the Central Asian Orogenic Belt and the final closure time of the Paleo-Asian Ocean. However, although numerous geochronologic, geochemical, and isotopic data have been</span> <span>obtained,</span><span> no consensus has been reached yet on the Early Permian tectonic setting for this region and, thus, the final closure time of the Paleo-Asian Ocean, mainly because of the nonuniqueness of the interpretations deduced from such data base. Therefore, other methods are urgently needed to provide more constraints from different perspectives. We present here a paleomagnetic study on the Gubaoquan doleritic dike swarm in the South Beishan area. Thermo-magnetic experiments and room-temperature hysteresis loops reveal that single-domain and multi-domain magnetite is the principal carrier of remanence. Anisotropy of magnetic susceptibility of studied dikes shows a horizontal magnetic foliation with a magnetic lineation generally parallel to the dikes’ strike. Plagioclase <sup>40</sup>Ar/<sup>39</sup>Ar dating result of one dolerite sample collected from the margin of a 10m-thick dike provides a cooling age at 300~284 Ma. Scanning electronic microscope observation coupled with energy-dispersive X-ray spectrometry shows that the remanence carrier is mainly euhedral without evident chemical alteration nor secondary mineral formation. Characteristic remanent magnetizations are successfully isolated from twenty dikes, and pass baked contact test. According to <em>Deenen et al. </em>(2011) statistical criteria, the distribution of the remanence directions reflects the contribution from paleosecular variation of the geomagnetic field. Taking all data together, the Gubaoquan doleritic dike swarm probably preserves a primary remanence. Consequently, an Early Permian paleomagnetic pole for the South Beishan can be calculated at <em>λ</em> = 80.2°N, <em>φ</em> = 300.3°E, <em>A<sub>95</sub></em> = 5.3° and <em>N</em> = 20. Comparisons of this new result with published ones from neighboring blocks bring us following implications for the tectonic evolution of the SW CAOB: 1. Neither relative latitudinal movement nor relative rotation can be paleomagnetically detected among Yili, Turpan-Hami, and South Beishan since the Early Permian. 2. Significant relative rotations have taken place between South Junggar and Tarim with respect to South Beishan-Turpan-Hami-Yili, respectively, since the Early Permian, corresponding to large-magnitude strike-slip displacements along mega-shear zones. 3. No obvious relative latitudinal movement has occurred between South Beishan and its neighboring blocks (Tarim, South Junggar, Yili, Turpan-Hami, and Dunhuang) since the Early Permian, combined with other evident, suggesting that the Paleo-Asian Ocean probably have closed before the Early Permian, and South Beishan was in a rift setting in the Early Permian.</span></p>

Late Paleozoic subduction and collision processes during the amalgamation of the Central Asian Orogenic Belt along the South Tianshan suture zone

Lithos ◽  
2016 ◽  
Vol 246-247 ◽  
pp. 1-12 ◽  
Author(s):  
Yigui Han ◽  
Guochun Zhao ◽  
Min Sun ◽  
Paul R. Eizenhöfer ◽  
Wenzhu Hou ◽  
...  
Keyword(s):  
Suture Zone ◽  
Orogenic Belt ◽  
Central Asian Orogenic Belt ◽  
Late Paleozoic ◽  
The South ◽  
Central Asian ◽  
South Tianshan ◽  
Collision Processes
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