Tectonic evolution of the Sichuan Basin, Southwest China

Liu, Shugen; Yang, Yu; Deng, Bin; Zhong, Yijiang; Wen, L.; Sun, Wei; Li, Zhiwu; Jansa, L. F.; Li, Jinxi; Jin, Song; Zhang, Xihua; Peng, Hanling

doi:10.1016/j.earscirev.2020.103470

Cited by 191 publications

(116 citation statements)

References 65 publications

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“…Therefore, except for the Triassic salt décollement and the basal décollements, there may exist no other active regional detachment beneath the southern WSFTB (Figure 9). This speculation seems to be supported by the discovery that the southern WSFTB was dominated by a palaeo-uplift context before the Triassic, (e.g., Wei et al, 2008;Liu et al, 2020).…”

Section: Comparison With the Wsftbmentioning

confidence: 94%

“…With regard to the marine strata in middle-deep structural levels, several intracratonic sags and palaeo-uplifts of different ages were developed beneath the Triassic salt (Liu et al, 2020 and references therein). The sags occurred in the central-northern segments of the western Sichuan Basin, while the uplifts nucleated in the southerncentral segments (Figure 14 in Liu et al, 2020). They all orient at high angles to modern Longmen Shan orogen and may have greatly affected stratigraphic architectures, thus contribute to along-strike variation of weak rock distribution.…”

Section: Geological Settingmentioning

confidence: 99%

“…Two major stages were distinguished corresponding to the stratigraphic architecture changing from late Paleozoic to early Middle Triassic marine sequences to post Middle Triassic wedgeshaped terrestrial strata, (e.g. Li et al, 2003;Meng et al, 2005;Jia et al, 2006;Yan et al, 2011;Yan et al, 2018;Liu et al, 2020). Within this thick sedimentary cover, a large number of incomplete or weak rock units were found activated as décollement layers on outcrops and interpreted seismic profiles, for example the argillaceous siltstone of Cambrian, the black coaly shale of Silurian and the halite-salt of Triassic in marine stratum at the lower-middle structural levels, as well as the shallow-level coal and mudstone of upper Triassic and Jurassic, (e.g.…”

Section: Geological Settingmentioning

confidence: 99%

“…Terrestrial strata in the shallow structural level are associated with formation of the Longmen Shan there and two major orogenic events could be identified (Burchfiel et al, 1995;Jia et al, 2006;Jia et al, 2010). The first one witnessed by wedge-shaped terrestrial clastic rocks took place in Late Triassic to Late Cretaceous times when the Songpan-Ganzi ocean basin closed (Luo and Long, 1992;Liu et al, 1996;Meng et al, 2005;Liu et al, 2012;Liu et al, 2020). It produced flexurally loaded foredeep affecting the whole western margin of the Sichuan Basin (Li et al, 2003;Jia et al, 2006).…”

Section: Geological Settingmentioning

confidence: 99%

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Structural Significance of the Mid-level Décollement Within the Western Sichuan Fold-And-Thrust Belt (WSFTB), Insights From Sandbox Modeling

Sun

et al. 2021

Front. Earth Sci.

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The WSFTB is located outboard of the eastern Tibetan Plateau, western China. It has received great attention due to high earthquake risks and rich resources of oil and gas. For both issues, the detailed structural configuration and deformation mechanism behind it are of great importance, but remain unclear due to the complexity created by the presence of multiple décollements. The effect of regionally distributed shallow Triassic salt décollement (SD) and the basal one (BD) has been well understood. In this paper, we focus on the third décollement situated between them. We conducted three sandbox experiments by varying this mid-level décollement (MD) from absence to presence, and from frictional to viscous, to test the effect on diversity of regional structural configuration. Our experimental results illustrated that 1) Absence of MD facilitated decoupling on SD, forming the greatest contrast between subsurface deformation front and the blind one beneath SD; 2) Frictional MD itself showed little decoupling, while its weakness reduced the bulk strength of deep structural level, lowering decoupling effect on SD and leading to approximating deformation fronts in the shallow and deep; 3) The viscous MD, along with SD relieved the resistance on their interbed layer. Consequently, the fastest deformation propagation rate and farthest deformation front (in all the experiments) occurred in the middle structural level. The modeled fold and thrust structures are comparable with the southern, central and northern WSFTB respectively, suggesting that varied MD may control the along-strike structural variations presented. The results also indicate that MD can alter the deformation partition in depth of any other multiple décollement system.

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Section: Comparison With the Wsftbmentioning

confidence: 94%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

See 2 more Smart Citations

Structural Significance of the Mid-level Décollement Within the Western Sichuan Fold-And-Thrust Belt (WSFTB), Insights From Sandbox Modeling

Sun

et al. 2021

Front. Earth Sci.

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“…e study area is situated in the Central Sichuan fold belt [30]. e strata are composed of the Quaternary sediments, Jurassic-Cretaceous calcareous mudstones and sandstones, and Triassic limestones (Figure 2) [31].…”

Section: Study Areamentioning

confidence: 99%

Hydrochemistry and Entropy-Based Groundwater Quality Assessment in the Suining Area, Southwestern China

Zhang

Luo

et al. 2021

Journal of Chemistry

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Groundwater is an essential resource for sustainable development, whose quality is significant for human health. In the present study, twenty-eight groundwater samples were collected from domestic tube wells and public water supply wells in the Suining area, southwestern China. The integration of statistical analysis, correlations of ions, geomodelling, and entropy-weighted water quality index (EWQI) was carried out to clarify the hydrochemistry and groundwater quality in the study area. By the statistical analysis, the cations followed the concentration order as Ca2+> Na+> Mg2+> K+, while anions’ concentrations were HCO3− > SO42− > Cl− > NO3− > F−. Piper trilinear diagram showed the hydrochemical type was characterized as Ca-HCO3. Correlations of ions and geomodelling revealed the concentrations of major ions were mainly determined by carbonate dissolution and ion exchange process, and NO3− concentrations were controlled by agriculture activities. EWQI computation demonstrated that most of the groundwater samples possessed EWQI values higher than 100. Therefore, groundwater quality is lower than the permissible limit of the World Health Organization (WHO), suitable for drinking purposes in the Suining area. Our study provides vital knowledge for groundwater management in the Suining and other similar areas.

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Identifying geomorphic domains using hierarchically clustered drainage area‐slope scaling

Wang

2024

Earth Surf Processes Landf

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Area‐slope scaling is an important tool for analysing geomorphic processes. In this study, we used hierarchical clustering to sort the area‐slope scaling data for both the numerical landscape created using the LandLab model and real landscapes. Random forest analysis was used to explore the effect of hierarchical clustering. We aimed to illustrate the heterogeneous features of area‐slope clustering and their influencing factors and to test whether they can be used to distinguish geomorphic domains. Our results showed that hierarchical clustering can easily detect the heterogeneous features of area‐slope scaling constrained by tectonic uplift and fluvial erodibility but not those constrained by the diffusion coefficient. The slope gradients over the inflection/transition zone of the colluvial and fluvial domains play a key role in identifying area‐slope scaling from different geomorphic domains. Case studies show that area‐slope scaling of clusters would be affected by different lithology and distance away from the trunk channel. In the high erosion circumstance, the fluvial process caused by tectonics leads to increasing slope gradients over whole geomorphic domains, as well as to retreating inflection between the colluvial and fluvial process domains. In low erosion circumstances or steady state, the fluvial process caused by nearby rivers cannot effectively change the slope gradients but can retreat the inflection. The real landscapes suggest that basins should be carefully selected for area‐slope scaling analysis to ensure that they are representative of the entire study area. Before geomorphological research, more basins of a specific research region need to be selected to conduct hierarchical clustering to select representative basins. Our study could be helpful in the identification of area‐slope domains, the extraction of geomorphic metrics and geomorphic process research.

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Tectonic evolution of the Sichuan Basin, Southwest China

Cited by 191 publications

References 65 publications

Structural Significance of the Mid-level Décollement Within the Western Sichuan Fold-And-Thrust Belt (WSFTB), Insights From Sandbox Modeling

Structural Significance of the Mid-level Décollement Within the Western Sichuan Fold-And-Thrust Belt (WSFTB), Insights From Sandbox Modeling

Hydrochemistry and Entropy-Based Groundwater Quality Assessment in the Suining Area, Southwestern China

Identifying geomorphic domains using hierarchically clustered drainage area‐slope scaling

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