Mesozoic intracontinental deformation of the Alxa Block in the middle part of Central Asian Orogenic Belt: A review.
In: International Geology Review, Jg. 63 (2021-07-15), Heft 12, S. 1490-1520
Online
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Zugriff:
Intracontinental deformation is an inseparable element of the evolutionary history of orogenic belts. It can reactivate and intensely modify the structures of previous orogenic belts due to remote effects of plate margin orogenesis. As an important part of the Phanerozoic Central Asian Orogenic Belt (CAOB), the Alxa Block and its vicinity experienced multistage intracontinental deformation during the Mesozoic and Cenozoic and became a representative region to study remote effects from plate margins. Both the previous structures of the CAOB and continuous accretion to the Eurasian continent from different directions controlled and affected the Mesozoic evolution of the Alxa Block. However, mantle loading can't pertinently explain the geological phenomena alone. In the Late Triassic, the Alxa Block was deformed by large-scale left-lateral shearing along largely northeast-southwest-trending faults and rotated anticlockwise caused by the collision between the North China Craton and Yangtze Craton and the northward movement of the North China Craton. In the Late Jurassic, the low-angle westward subduction of the Paleo-Pacific Ocean beneath the Eurasian Plate, the closure of the Mongol-Okhotsk Ocean to the north and/or the Lhasa-Qiangtang collision to the south combined to deform the Alxa Block from different directions, forming contraction structures with various strikes and invert previous extensional basins. In the Late Cretaceous, the Eurasian Plate experienced oblique collision along its southeastern margin and the subduction of the Neo-Tethys along its southern boundary, an intraplate sinistral transpressional megashear system developed along the eastern Alxa Block, and the uplift of mountain ranges along the basin margins. The multistage Mesozoic intracontinental deformation of the Alxa Block supports the view that they are driven by stresses generated at plate boundaries largely, and controlled by previous complicated orogenic structures in the upper crust. [ABSTRACT FROM AUTHOR]
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Mesozoic intracontinental deformation of the Alxa Block in the middle part of Central Asian Orogenic Belt: A review.
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Autor/in / Beteiligte Person: | Zhang, Jin ; Wang, Yannan ; Qu, Junfeng ; Zhang, Beihang ; Zhao, Heng ; Yun, Long ; Li, Tianyi ; Niu, Pengfei ; Nie, Fengjun ; Hui, Jie ; Zhang, Yiping |
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Zeitschrift: | International Geology Review, Jg. 63 (2021-07-15), Heft 12, S. 1490-1520 |
Veröffentlichung: | 2021 |
Medientyp: | academicJournal |
ISSN: | 0020-6814 (print) |
DOI: | 10.1080/00206814.2020.1783583 |
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