Cenozoic structural deformation in the Yuqia-Jiulongshan region, northern Qaidam Basin, China

Chen, Siyuan; Zhang, Yongshu; Wu, Lei; Zhang, Junyong; Wang, Liqun; Xiao, Anguo; Shen, Yue

doi:10.1016/s1876-3804(20)60010-6

Cited by 7 publications

(6 citation statements)

References 22 publications

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“…The EQB is bounded by the North Kunlun Thrust to the south and the NW‐SE NQT to the north. Notably, the dividing line is located exactly at the tectonic turning point of these basin boundary faults, which suggests different compressive stress environments (S. Chen et al, 2020; L. Wu et al, 2014). The shortening strain of the WQB is 12–25%, Yin et al (2007) even proposed a shortening strain of >48%, which is significantly higher than that of the EQB (Figure 6).…”

Section: Discussionmentioning

confidence: 99%

“…According to the high‐resolution short seismic profiles, the local tectonic structures have been discussed in more detail, including the Youshashan Anticlinorium, Qimen Tagh Thrust, Lenghu Anticlinorium, and Mahai Uplift (S, Chen et al, 2020; F. Cheng et al, 2014; Huang et al, 2020; L. Wu et al, 2014). Considering the lower resolution of long seismic profiles than the short seismic profiles, it is very hard to discuss every small tectonic structure in this study.…”

Section: Methodsmentioning

confidence: 99%

“…As the north boundary of the Qaidam Basin, the NQT consists of several branch‐thrust faults, probably with dextral strike‐slip, including the Saibei Fault, Sainan Fault, Qaidam Fault, Lvnan Fault, Lingjian Fault, Olongbulak Fault, and Aimunik Fault (Figure 1; X. Cheng et al, 2016; Q. Xiao, Shao, Yu, Cai, & Wang, 2016). In addition, several secondary depressions have been discovered between these branch faults, which make recognizing basin boundaries more challenging (S. Chen et al, 2020; Yu et al, 2017).…”

Section: Geological Settingmentioning

confidence: 99%

“…The comparison of the shortening strain of different tectonic units should be conducted carefully because of the uncertain tectonic division and dispersed basin boundary faults in the Qaidam Basin (Zhou, 2005). However, identifying every basin boundary fault has always been a challenge, especially in the NQT, which consists of several branch faults (Figure 1; S. Chen et al, 2020; A. Xiao et al, 2006; Yu et al, 2017). To responsibly quantify crustal deformation, we define several deformation regions related to surrounding orogenic belts, make the correction of boundary faults, and calculate the shortening strain of each fold and displacement of each fault.…”

Section: Introductionmentioning

confidence: 99%

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Difference of shortening strain for the crustal deformation model in the eastern and western Qaidam Basin and their implications, northern Tibetan Plateau, China

Jiang

Gong

2021

Geological Journal

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To recognize the differences in the west–east crustal deformation model of the Qaidam Basin, we presented the shortening amount of each fold and fault along 12 sections. According to the eastward weakening trend of shortening strain in the southwestern part of the basin and the non‐continuous trend in the northeastern part of the basin, the Qaidam Basin can be divided by a new line into the western Qaidam Basin (WQB) and the eastern Qaidam Basin (EQB). The WQB is characterized by a maximum shortening strain of 25%, transpressional structures, and crust–mantle decoupling, which is possibly weakened by the eastward extension of the crust–mantle mix zone caused by upwelling material along the Altyn Tagh Fault (ATF). In contrast, the EQB is characterized by a minimum shortening strain of 2%, pure thrust boundary faults, and gentle folds, which is defined as a rigid craton basin. The crust–mantle mix zone beneath ATF and the low‐velocity zone beneath the eastern Kunlun Shan show the limited impact of the lithospheric weakening on the EQB. The Miocene reorganization of the ATF is the key tectonic event that accounts for the differences in the east–west crustal deformation model of the Qaidam Basin, as it weakened the lithosphere and facilitated the transpressional structures of the WQB. The WQB was originally a rigid craton basin like the EQB, but it became a destabilized craton after the a forementioned tectonic event.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Difference of shortening strain for the crustal deformation model in the eastern and western Qaidam Basin and their implications, northern Tibetan Plateau, China

Jiang

Gong

2021

Geological Journal

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“…The oil and gas exploration began in 1954, and 29 oil and gas fields have been discovered so far. Proved oil and gas geological reserves of 10.2 × 10 8 t, the current annual oil and gas equivalent reaches 800 × 10 4 t (Chen et al., 2020; Fu et al., 2016).…”

Section: Introductionmentioning

confidence: 99%

Structural modeling and evolution of the piedmont zone in north margin of Qaidam Basin, northeastern Tibetan Plateau

Wang

et al. 2020

Energy Exploration & Exploitation

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The analysis and interpretation of the Dachaidan area, Qaidam Basin, is difficult, owing to the co-location of two groups of thrust faults (N–E faults and N–W faults) there and the area’s complicated structural deformation history. To address this problem, field geological investigation, seismic study, well logging, and drilling data were used to identify the key fault systems and their distribution patterns through the area. By integrating surface and subsurface structural features and seismic and non-seismic data, we carried out studies using structural modeling and analysis of the Dachaidan area. Study results identified two systems of thrust faults (N–W faults and W–E faults). We found that these faults could be categorized into three systems: a basin-margin thrust system, an intro-basin thrust system, and an intro-basin compression and strike-slip fault system. These systems showed different features in different areas and zones. We also constructed interpretation models of different deformation mechanisms in the basin and on basin margins. Three tectonic systems (compression, extension, and strike-slip) were identified, which were further divided into eight structural domains. We also established structure coexistence and distribution patterns. The overall structural character of the area was summarized as the northern and southern parts belonging to different zones, with the western and eastern parts belonging to different systems. By analyzing the SW–NE tectonic evolution sections, we defined the back-propagation structural evolution sequences of thrust nappes (on the basin margin or in the basin) and back-thrust structures (in the basin) as well as their influence on the residual Mesozoic strata.

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Multiscale lithospheric buckling dominates the Cenozoic subsidence and deformation of the Qaidam Basin: A new model for the growth of the northern Tibetan Plateau

Zhang

et al. 2022

Earth-Science Reviews

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Cenozoic structural deformation in the Yuqia-Jiulongshan region, northern Qaidam Basin, China

Cited by 7 publications

References 22 publications

Difference of shortening strain for the crustal deformation model in the eastern and western Qaidam Basin and their implications, northern Tibetan Plateau, China

Difference of shortening strain for the crustal deformation model in the eastern and western Qaidam Basin and their implications, northern Tibetan Plateau, China

Structural modeling and evolution of the piedmont zone in north margin of Qaidam Basin, northeastern Tibetan Plateau

Multiscale lithospheric buckling dominates the Cenozoic subsidence and deformation of the Qaidam Basin: A new model for the growth of the northern Tibetan Plateau

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