Intracontinental evolution of the southern Central Asian Orogenic Belt: Evidence from Late Triassic nappe structure in the northern Alxa region, NW China

Yu, Wei; Shao, Zhaogang; Niu, Manlan; Su, Hailin; Zhang, Yiping; Wang, Yongchao

doi:10.1016/j.jseaes.2022.105468

Cited by 3 publications

(5 citation statements)

References 74 publications

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“…However, the formation of the E–W‐trending folds in the Zhuozishan and Shitanjing areas during the Middle–Late Triassic is probably related to the closure of the Paleo‐Asian Ocean to the north (Su et al, 2023; Yu et al, 2023; Zhang, Li, et al, 2009). For the same reason, some nappe structures were formed in the southern Central Asian Orogenic Belt (Su et al, 2023; Yu et al, 2023) during the Middle–Late Triassic.…”

Section: Discussionmentioning

confidence: 99%

“…(b) Model showing the multi‐plate convergence in Ordos Basin during the Middle Jurassic–early Early Cretaceous. After Bai and Lv (2009); Chen et al (2007); Huo et al (1989); Su et al (2023); Yu et al (2023); Zhang and Dong (2019); and Zhao (2003). The base map is from www.geomapapp.org (Ryan et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…After the closure of the North Qilian Ocean during the Late Ordovician-Early Silurian (Chen et al, 2022;Song et al, 2013;Xu et al, 2015;Yu et al, 2021) and the collision between the Central Qilian and Alxa blocks during the Silurian-Middle Devonian, the WFTB and its surrounding areas likely experienced post-orogenic extension during the Late Palaeozoic (Huo et al, 1989;Li, 2006;Song et al, 2013;Zhang, 2019). During the Middle-Late Triassic, due to combined effect of the collision between the South China and North China plates to the south (Dong et al, 2011;Li, 2006;Yang & Dong, 2020;Yin & Nie, 1993;Zhang et al, 2001 and the closure of the Paleo-Asian Ocean to the north (Song et al, 2021;Su et al, 2023;Yu et al, 2023;Zhang, Li, et al, 2009), a large number of the E-W-trending folds and thrust faults were formed in the WFTB and its surrounding areas. In the later period, the WFTB and its surrounding areas were modified by Yanshanian and Himalayan intracontinental deformation to a certain extent (BGMN, 1990;Cheng, 2019;Craddock et al, 2011;Guo et al, 2015Guo et al, , 2016Huo et al, 1989;Li, 1999Li, , 2006Min et al, 2023;Shi et al, 2006;Yang & Dong, 2020;Zhang, 2007;Zhang et al, 1991Zhang et al, , 2010Zhang & Dong, 2019;Zheng et al, 2006).…”

Section: Regional Geologymentioning

confidence: 99%

“…This nearly N-S compression in the Middle-Late Triassic is probably related to the collision between the South China and North China plates and the closure of the Mianlue Ocean to the south. However, the formation of the E-W-trending folds in the Zhuozishan and Shitanjing areas during the Middle-Late Triassic is probably related to the closure of the Paleo-Asian Ocean to the north (Su et al, 2023;Yu et al, 2023;Zhang, Li, et al, 2009). For the same reason, some nappe structures were formed in the southern Central Asian Orogenic Belt (Su et al, 2023;Yu et al, 2023) During the Middle Jurassic-early Early Cretaceous, the multiplate convergence tectonic system was forming in East Asia (Zhang & Dong, 2019).…”

Section: Implications For the Regional Tectonic Evolutionmentioning

confidence: 99%

“…However, the formation of the E-W-trending folds in the Zhuozishan and Shitanjing areas during the Middle-Late Triassic is probably related to the closure of the Paleo-Asian Ocean to the north (Su et al, 2023;Yu et al, 2023;Zhang, Li, et al, 2009). For the same reason, some nappe structures were formed in the southern Central Asian Orogenic Belt (Su et al, 2023;Yu et al, 2023) During the Middle Jurassic-early Early Cretaceous, the multiplate convergence tectonic system was forming in East Asia (Zhang & Dong, 2019). In the Daqingshan area of the northern margin of Ordos Basin, NNW/N-directed thrust sheet was developed during the Late Jurassic-Early Cretaceous (Darby et al, 2001;Zheng et al, 1998), which is probably related to the closure of the Mongol-Okhotsk Ocean.…”

Section: Implications For the Regional Tectonic Evolutionmentioning

confidence: 99%

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Differential deformation mechanism of E–W‐trending Weiningbeishan fold‐thrust belt from central Ningxia, NW China

Zhou,

Chen,

Shao

et al. 2024

Geological Journal

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The Weiningbeishan fold‐thrust belt (WFTB), located in the transitional zone of the Tibetan Plateau, Alxa Block and Ordos Basin, is an ancient intracontinental orogenic belt. In this article, structural analysis is conducted to more finely reveal differential deformation between the Devonian and Carboniferous strata in the WFTB. We found that the E–W‐trending open folds are mainly developed in the Upper Devonian Zhongning Formation (D3z), while the E–W‐trending close and tight folds are mainly developed in the Carboniferous strata. The N–S minimum shortening strain of the bottom boundary of Member 2 of the Upper Devonian Zhongning Formation (D3z2) is 21.1%, whereas the N–S minimum shortening strain of the bottom boundary of Member 2 of the Upper Carboniferous Danliangshan Formation (C2d2) is 64.1%. We propose that the E–W‐trending open folds in the Upper Devonian Zhongning Formation (D3z) and E–W‐trending close and tight folds in the Carboniferous strata were formed under the N–S compression during the Middle–Late Triassic. The Zhangyigou and Laoyagou faults are the main tear faults to accommodate differential displacement on the surface between the Upper Devonian Zhongning Formation (D3z) in the east and Carboniferous strata in the middle, which change into a décollement fault in the deep part of the Dafosigou fold area in the middle to accommodate differential deformation between the deep Upper Devonian Zhongning Formation (D3z) and Carboniferous strata. This study enables us to better understand the Mesozoic intracontinental deformation in response to far‐field plate‐boundary convergence in NW China.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Regional Geologymentioning

confidence: 99%

Section: Implications For the Regional Tectonic Evolutionmentioning

confidence: 99%

Section: Implications For the Regional Tectonic Evolutionmentioning

confidence: 99%

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Differential deformation mechanism of E–W‐trending Weiningbeishan fold‐thrust belt from central Ningxia, NW China

Zhou,

Chen,

Shao

et al. 2024

Geological Journal

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Late Triassic Intracontinental Deformation of South Tianshan, Central Asia: Evidence from Syn‐tectonic Sedimentation and Detrital Zircon Provenances of the Kuqa Depression

QIN,

CHEN,

SHAO

et al. 2024

Acta Geologica Sinica (Eng)

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The Tianshan range, a Paleozoic orogenic belt in Central Asia, has undergone multiple phases of tectonic activities characterized by the N‐S compression after the early Mesozoic, including the far‐field effects of the Cenozoic Indian‐Asian collision. However, there are limited reports on the tectonic deformation and initiation of Triassic intracontinental deformation in the Tianshan range. Understanding this structural context is crucial for interpreting the early intracontinental deformation history of the Eurasian continent during the early Mesozoic. Growth strata and syn‐tectonic sediments provide a rich source of information on tectonic activities and have been extensively used in the studies of orogenic belts. Based on detail fieldwork conducted in this study, the middle‐late Triassic Kelamayi Formation of the northern Kuqa Depression in the southern Tianshan fold‐thrust belt has been identified as the typical syn‐tectonic growth strata. The youngest detrital zircon component in two lithic sandstone samples from the bottom and top of the Kelamayi growth strata yielded U‐Pb ages of 223.4 ± 3.1 and 215.5 ± 2.9 Ma, respectively, indicating that the maximum depositional age of the bottom and top of the Kelamayi growth strata is 226‐220 and 218‐212 Ma. The geochronological distribution of detrital samples from the Early‐Middle Triassic and Late Triassic revealed abrupt changes, suggesting a new source supply resulting from tectonic activation in the Tianshan range. The coupling relationship between the syn‐tectonic sedimentation of the Kelamayi Formation and the South Tianshan fold‐thrust system provides robust evidence that the Triassic intracontinental deformation of the South Tianshan range began at approximately 226‐220 Ma (during the Late Triassic) and ended at approximately 218‐212 Ma. These findings provide crucial constraints for understanding the intraplate deformation in the Tianshan range during the Triassic.

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Discovery of the large-scale thrust nappe and its geological significance in the southwestern Santanghu fold–thrust belt, NW China

Zhen,

Xu,

et al. 2023

Front. Earth Sci.

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Studying the structural evolution of the piedmont fold and thrust belt is one of the most important methods to interpret the mechanism of intracontinental collision orogeny. In this study, we have discovered a long-distance large-scale thrust nappe with a width of approximately 20 km in the southwestern margin of the Santanghu Basin, which provides a good evidence for studying the Mesozoic–Cenozoic tectonic evolution mechanism of Moqinwula Mountain. Using the electromagnetic and high-resolution seismic profiles, we have determined that the hanging wall of the nappe is composed of the pre-growth strata of the Carboniferous–Middle Jurassic period and the syntectonic strata of the Cretaceous–Quaternary period. The nappe is subjected to two branch faults of the Baiyishan thrust, forming a breakthrough fault-propagation fold and a fault-bend fold along the detachment layer of the Haerjiawu Formation, and a large monoclinic is formed by the basement structural wedge near the mountain root. The growth strata and unconformity structure record that the fold–thrust belt has experienced five episodes of thrusting from the Late Triassic to Quaternary period. Based on sequential restoration and forward modeling, we propose that the southwestern margin of the Santanghu Basin has been shortened by at least 55 km, especially in the Late Jurassic and Late Cretaceous. Our results provide an excellent example for studying the mechanism of the transition from Yanshanian transpression to Himalayan thrust compression in the Eastern Tianshan region.

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Intracontinental evolution of the southern Central Asian Orogenic Belt: Evidence from Late Triassic nappe structure in the northern Alxa region, NW China

Cited by 3 publications

References 74 publications

Differential deformation mechanism of E–W‐trending Weiningbeishan fold‐thrust belt from central Ningxia, NW China

Differential deformation mechanism of E–W‐trending Weiningbeishan fold‐thrust belt from central Ningxia, NW China

Late Triassic Intracontinental Deformation of South Tianshan, Central Asia: Evidence from Syn‐tectonic Sedimentation and Detrital Zircon Provenances of the Kuqa Depression

Discovery of the large-scale thrust nappe and its geological significance in the southwestern Santanghu fold–thrust belt, NW China

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