Mesozoic Tectonothermal Evolution of the Southern Central Asian Orogenic Belt: Evidence from Apatite Fission-Track Thermochronology in Shalazha Mountain, Inner Mongolia

Peng, Heng; Wang, Jianqiang; Liu, Chiyang; Zhang, Shaohua; Niu, Yazhuo; Zhang, Tianbing; Song, Bo; Han, Wenzhong

doi:10.1007/s12583-020-1053-z

Cited by 11 publications

(6 citation statements)

References 94 publications

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“…In SW Mongolia, Lehmann et al (2010) published 40 Ar/ 39 Ar ages between 280 Ma and 225 Ma, which were related to the change in tectonic compression from E-W to N-S. In addition, the regional lowtemperature thermochronological data around this region are consistent with this Triassic nearly N-S compression in the study area (Vassallo et al, 2007;Zhao et al, 2007;Liu et al, 2010;Han et al, 2015;Gillespie et al, 2017;Liu et al, 2017;Song et al, 2018b;Peng et al, 2020). Zheng et al (1991) and Zuo et al (1992) documented that the klippen in the Zhusileng-Hangwula and Beishan areas formed during the Late Jurassic.…”

Section: Timing Of the Nappe Structuresupporting

confidence: 55%

Triassic Nappe in the Central Part of the Southern Central Asian Orogenic Belt (Ejinaq, NW China): Evidence from Structural Analysis and Geothermochronology

Chen

Shao

et al. 2023

Acta Geologica Sinica (Eng)

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The thrust nappe played an important role in the Mesozoic tectonic evolution of the middle part of the Central Asian Orogenic Belt (CAOB). However, the timing, structural style and kinematic processes of the thrust nappe remain controversial, particularly the detail of the thrust nappe in the Guaizihu region (110 km east of Ejinaq). In this study, we investigate new field mapping, seismic sections, geochronology and low-temperature thermochronometric dating to provide constraints on the history of this thrust nappe in the Chaheilingashun area (northwestern Guaizihu region). The field mapping, seismic sections and structural analysis reveal that the autochthonous system had developed a series of strong fold structures in the upper Permian strata. The allochthonous system mainly contains Devonian monzogranite (U-Pb age, ranges from 386.7 to 389.0 Ma) and Meso-Neoproterozoic schists (the maximum depositional age, ~880 Ma), which were thrust upon the upper Permian strata during Middle to Late Triassic. Based on similar rocks, geochronological dating and the Yagan thrust, we suggest that the postulated root zone of this allochthon might have originated from the Huhetaoergai area (40-60 km northwest of the study area). The geochronological results reveal that the lower age limit of this thrust nappe is constrained by the Lower-Middle Triassic syntectonic sediments (tuffaceous sandstone, ~247 Ma), which is the sedimentary response of the fold structure.,The timing of the termination of this thrust nappe is defined by the cooling age ( 40 Ar/ 39 Ar data, 217-211 Ma) of the Devonian monzogranite and Meso-Neoproterozoic schists. Thus, we consider this thrust event in the study area to potentially have occurred in the period from 247 Ma to 211 Ma, which may represent the tectonic response to the closure of the Paleo-Asian Ocean.

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Section: Timing Of the Nappe Structuresupporting

confidence: 55%

Triassic Nappe in the Central Part of the Southern Central Asian Orogenic Belt (Ejinaq, NW China): Evidence from Structural Analysis and Geothermochronology

Chen

Shao

et al. 2023

Acta Geologica Sinica (Eng)

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“…uplift, situated to the east of the study area, indicate a rapid uplift during the Late Triassic-Early Jurassic (230-174 Ma), marked by a cooling rate of 11.6 ℃/Ma, while the average cooling rate in the southern part of the Shalazha Mts. was 0.86 ℃/Ma (Peng et al, 2023). In the Langshan area, located to the east of the Alxa block, AFT thermal history simulations reveal an uplift-cooling event spanning 220-160 Ma (Feng et al, 2017).…”

Section: Tectono-thermal Evolution and Dynamic Backgroundmentioning

confidence: 96%

“…Additionally, the Salazha Mts. and its northern and southern sags have undergone three distinct tectonicthermal events, corresponding to the Late Triassic-Early Jurassic (230-174 Ma), Late Jurassic-Early Cretaceous (174-135 Ma), and Late Early Cretaceous (approximately 105.6 Ma) (Peng et al, 2023) (Fig. 1).…”

mentioning

confidence: 99%

Apatite Fission‐Track Thermochronology in the Tamusu Area, Bayingobi Basin, NW China, and its Geological Significance

TONG,

QIN,

2024

Acta Geologica Sinica (Eng)

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The Bayingobi basin is located in the middle of Central Asia Orogenic Belt, at the intersection of Paleo‐Asian Ocean and Tethys Ocean, as well as the junction of multiple tectonic plates. This unique tectonic setting underpins the basin's intricate history of tectonic activity. To unravel the multifaceted tectono‐thermal evolution within the southwestern region of the basin and to elucidate the implications of sandstone‐hosted uranium mineralization, granitic and clastic rock samples were collected from the Zongnai Mts. uplift and Yingejing depression, and apatite fission track (AFT) dating and thermal history simulation analysis were performed. AFT dating findings reveal that the apparent ages of all samples fall within the range of 244 Ma to 112 Ma. In particular, the bedrock of the Zongnai Mts. and Jurassic detrital apatite fission tracks have undergone complete annealing, capturing the uplift‐cooling age. Meanwhile, the AFT ages of Cretaceous detrital rocks are either equivalent to or notably exceed the age of sedimentary strata, signifying the cooling age of the provenance. A comprehensive examination of AFT ages and palaeocurrent direction analyses suggests that the Cretaceous source in the Tamusu area predominantly originated from the central and southern sectors of the Zongnai Mts. uplift. However, at a certain juncture during the Late Early Cretaceous, the Cretaceous provenance expanded to include the northern part of the Zongnai Mts. uplift. Based on the results of thermal history simulations and previous studies, it is considered that the Tamusu area has undergone four distinct tectonic uplift events since the Late Paleozoic. The first is the Late Permian to Early Triassic (260–240 Ma), which is associated with the closure of the Paleo‐Asian Ocean and the accretionary orogeny within the Alxa region. The second uplift event took place in the Early Jurassic (190–175 Ma) and corresponded to intraplate orogeny following the closure of the Paleo‐Asian Ocean. The third uplift event is the Late Jurassic to Early Cretaceous (160–120 Ma), which is linked to the East Asia's position as the convergence center of multiple tectonic plates during this period. The fourth uplift event is linked to the Late Early Cretaceous (112–100 Ma), driven either by the westward subduction of the eastern Pacific plate or the mantle upwelling resulting from the Bangong–Nujiang oceanic lithosphere subduction and slab break‐off. The primary stress orientation for the first three tectonic uplift phases approximated a nearly SN direction, while the fourth stage featured a principal stress direction of NW. The fourth tectonic uplift event of the Late Early Cretaceous and basaltic eruption thermal event during this period likely exerted a significant influence on the formation of the Tamusu sandstone‐hosted uranium deposit.

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“…From the early Palaeozoic to the Mesozoic, the area experienced the collision and splicing of the North China plate and the Qilian-Qaidam block, corresponding to the subduction and closure of the Qilian Ocean's crust (Wu et al, 1993;Xu et al, 1994;Yang et al, 2002;Song et al, 2006). Evidence from geochemical, chronological, and field geological surveys shows that this area experienced significant crustal shortening and thickening events during the Late Triassic-Early Cretaceous (Lin et a, 2011;Dong and Santosh, 2016;Peng et al, 2018;. Influenced by the uplift and expansion of the Qinghai-Tibet Plateau in the Cenozoic, the study area also experienced differential uplift and orogeny.…”

Section: Structural Evolutionary Historymentioning

confidence: 99%

Crustal structure and geodynamics of the eastern Qilian orogenic belt, NE margin of the Qinghai-Tibet plateau, revealed by teleseismic receiver function

et al. 2023

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The eastern segment of the Qilian orogenic belt, comprising the Linxia block and Longzhong block, is at the Qinghai–Tibet Plateau’s northeastern margin. The area has experienced multiple tectonic events, including closure of the Qilian Ocean, convergence of the North China block and Qilian terrane, and collision of the Indian and Eurasian plates, forming a complex tectonic framework. To investigate the area’s geological evolution and the suture’s current location between the blocks, we used 3-year data recorded by 33 portable ChinArray II broadband stations (2013–2016). Using three teleseismic P-wave receiver function methods, H-κ stacking and common conversion point stacking (CCP), crustal structure, Poisson’s ratio, and Moho morphology were obtained at 33 stations. The results are described as follows: 1) The Maxianshan fault is an important boundary fault that divides the Linxia block and Longzhong block. The Linxia block’s layered crustal structure is obvious, and there is a low-velocity anomaly in the middle and lower crust, which may contain saline fluid and has Japanese-type island arc characteristics. 2) The layered structure of the Longzhong block’s upper crust is significant, while the middle and lower crust’s layered structure is weak with weak low-velocity characteristics and oceanic-island basaltic crust characteristics. The Longzhong block may have originally been formed by Mariana-type island arcs. 3) The Conrad interface and Moho lateral variation in the Ordos block’s southwestern margin are weak, showing stable craton characteristics. 4) Our results show that the Maxianshan fault cuts through the Earth’s crust and is a continuous west-dipping negative seismic phase in the Common Conversion Point section. The fault zone is the suture line between the Linxia block and Longzhong block. 5) The middle and upper crust of the Liupanshan tectonic belt is thrust upwards on the Ordos block’s southwestern margin, providing deep structural evidence of the Cenozoic uplift of the Liupanshan structural belt.

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Mesozoic Tectonothermal Evolution of the Southern Central Asian Orogenic Belt: Evidence from Apatite Fission-Track Thermochronology in Shalazha Mountain, Inner Mongolia

Cited by 11 publications

References 94 publications

Triassic Nappe in the Central Part of the Southern Central Asian Orogenic Belt (Ejinaq, NW China): Evidence from Structural Analysis and Geothermochronology

Triassic Nappe in the Central Part of the Southern Central Asian Orogenic Belt (Ejinaq, NW China): Evidence from Structural Analysis and Geothermochronology

Apatite Fission‐Track Thermochronology in the Tamusu Area, Bayingobi Basin, NW China, and its Geological Significance

Crustal structure and geodynamics of the eastern Qilian orogenic belt, NE margin of the Qinghai-Tibet plateau, revealed by teleseismic receiver function

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