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Superimposed deformation of the Solonker Belt and nearby regions in western Inner Mongolia, China

Published online by Cambridge University Press:  10 April 2018

GUANZHONG SHI ,
CHAO LIANG ,
HUA WANG  and
CHUANYAN HUANG
GUANZHONG SHI
Affiliation:
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
CHAO LIANG
Affiliation:
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
HUA WANG*
Affiliation:
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
CHUANYAN HUANG
Affiliation:
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
*
†Author for correspondence: wanghua@cug.edu.cn
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Abstract

The deformation of the Solonker Belt and nearby regions is helpful for understanding the tectonic evolution of the Central Asian Orogenic Belt. This study carried out structural analysis in the Mandula and Ganqi areas of western Inner Mongolia, including the Solonker Belt, the Southern Orogenic Belt and the northern Yinshan Belt (Langshan range). Our results reveal that the Solonker Belt, the Southern Orogenic Belt and the northern Yinshan Belt underwent two stages (D1 and D2) of deformation during the Mesozoic period. The D1 stage produced the NNE-directed thrusts and asymmetric folds, indicating a NNE–SSW contraction. The northern Yinshan Belt, the Southern Orogenic Belt and the Solonker Belt formed as a series of NNE-verging tectonic nappes. The D2 stage developed the NE-trending folds and the SE- or NW-directed thrusts that cross-cut the D1 structures. The two events of nearly orthogonal or oblique shortening gave rise to the superimposed structures (e.g. fold interference patterns). The quartz veins that filled the fractures of the D1 deformation contain zircons of Middle Triassic U–Pb ages. The new dating data, along with the regional sedimentary hiatus, led us to infer that the D1 stage of deformation occurred in Middle Triassic time and the D2 stage occurred in Late Jurassic time. We consider that the D1 stage of deformation resulted from a convergent event, which might be related to the closure of the Palaeo-Asian Ocean or limited, narrow ocean basins; and the D2 stage of deformation was the far-field result of subduction of the Palaeo-Pacific Ocean and the closure of the Mongol-Okhotsk Ocean.

Keywords

structural analysisSolonker BeltMesozoicCentral Asian Orogenic BeltInner Mongolia
Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 5 , May 2019 , pp. 811 - 832
Copyright
Copyright © Cambridge University Press 2018 

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