首页|Poly-phase structural evolution of the northeastern Alxa Block, China: Constraining the Paleozoic-Recent history of the southern central Asian Orogenic belt

Poly-phase structural evolution of the northeastern Alxa Block, China: Constraining the Paleozoic-Recent history of the southern central Asian Orogenic belt

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  • NSTL
  • Elsevier
The Alxa Block in western China is a significant tectonic unit in the middle part of the southern Central Asian Orogenic Belt that was affected by multiple Paleozoic and Meso-Cenozoic deformation events. In this study, the results from detailed mapping and structural analysis coupled with new U-Pb zircon ages indicate that the Langshan region of the northeastern Alxa Block has experienced ten deformation events since the Late Devonian. Four separate structural domains are identified based on distinctive litho tectonic relationships, and these domains contain intrusive and structural crosscutting relationships that allow the complex deformational history to be determined. Each deformation phase can be related to regional tectonic events associated with the consolidation of Central Asia's crust and subsequent intraplate reactivation. The first three events (D1-D3) are tied to convergence between the Alxa Block, the North China and the Yangtze Cratons prior to and during closure of the Paleo-Asian Ocean in the Mid Late Permian. Subsequently, sinistral displacement (D4) occurred between the Alxa Block and the North China Craton during the Triassic. Since the late Mesozoic, reactivation of the northeastern Alxa Block occurred repeatedly as an intraplate response to subduction of the Paleo-Pacific Plate, closure of the Mongol-Okhotsk Ocean (D5), retreating subduction of the Paleo-Pacific Ocean (D6), collision between the Qiangtang and Lhasa blocks and convergence between the East Asian margin and Western Philippine Block (D7), and later collision between India and Eurasia (D8-10). The Alxa Block provides a superb case study of how a continental interior region structurally records the multi-phase transition from plate margin tectonism to intraplate reactivation. The events documented in this study invite correlation with other Paleozoic-Recent tectonic events recorded elsewhere in the southern CAOB and adjacent cratonic blocks in Central Asia. (c) 2021 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

Alxa BlockCentral Asian Orogenic BeltPolyphase deformationIntraplate tectonismCrustal reactivationALTYN-TAGH FAULTU-PB AGESMETAMORPHIC CORE COMPLEXWESTERNMOST NORTH CHINAEAST GOBI BASININNER-MONGOLIANW CHINACENOZOIC TECTONICSTIBETAN PLATEAUORDOS BASIN

Yun, Long、Zhao, Shuo、Zheng, Rongguo、Zhang, Yiping、Zhang, Jin、Cunningham, Dickson、Qu, Junfeng、Zhang, Beihang、Li, Jinyi、Zhao, Heng、Niu, Pengfei、Hui, Jie

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Beijing Res Inst Uranium Geol

Chinese Acad Geol Sci

Eastern Connecticut State Univ

Univ Chinese Acad Sci

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2022

10.1016/j.gr.2021.12.007

Gondwana research

Gondwana research

SCI
ISSN：1342-937X
年,卷(期)：2022.105
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