Geomorphic evolution and neotectonics of the Qianhe River Basin on the southwest margin of the Ordos Block, North China

Zhang, Tianyu; Fan, Shuanghu; Chen, Shue; Li, Sanping; Lu, Yudong

doi:10.1016/j.jseaes.2019.02.020

Cited by 27 publications

(22 citation statements)

References 43 publications

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“…The threshold‐network density is a practical method of selecting a threshold that can effectively avoid blindness (Zhang et al, 2010). It is confirmed that 10,000 is a reasonable value to extract sub‐basins (Zhang, Fan, Chen, Li, & Lu, 2019). The final drainage map was obtained through further modifications of rivers that did not meet the actual conditions.…”

Section: Methods and Data Collectionmentioning

confidence: 85%

“…The value ranges from 1.6 to 24.8, the average value is 12.4. As shown in Table 1, the AF can be identified as three class (Zhang et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

“…Previous studies of the evaluation of the relative active tectonics based on geomorphic indices mostly concentrated on a specific basin or a particular mountain front (Azor, Keller, & Yeats, 2002; Chang et al, 2015; El Hamdouni et al, 2008; Silva et al, 2003; Zhang et al, 2019). This study is an attempt to evaluate the relative active tectonics in this area based on a section of a river.…”

Section: Discussionmentioning

confidence: 99%

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Assessment of tectonic activity based on the geomorphic indices in the middle reaches of the upstream of Jinsha River, China

Liu

et al. 2021

Geological Journal

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The middle reaches of the upstream of Jinsha River (MRUJR) is located in the eastern segment of the Jinsha River suture zone on the southwest of China. A study of the MRUJR based on tectonic geomorphology is noteworthy for providing a profound understanding of the tectonic transition between the Sichuan‐Yunnan and Qamdo blocks and active tectonics in various subbasins. Based on the global digital elevation model Shuttle Radar Topography Mission 1 (30 m resolution) data and geographic information system techniques, four geomorphic indices, the hypsometric integral, stream length‐gradient, drainage basin asymmetry, and drainage basin shape were calculated and analysed. Combined with geologic evidence from field surveys and fault slip rates estimated, the tectonic activities and mechanisms were discussed. Through the specific analytical comparisons, the variations in the geomorphic indices were unlikely affected by lithology and climate but showed changes in relevant tectonic activity. The analysis results of geomorphic index value manifested related strong activities in the northwestern and southeastern regions of MRUJR, tilt directions are mainly SW–NE and NE–SW, respectively. The MRUJR is undergoing rapid uplift. These results are consistent with the field evidence.

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Section: Methods and Data Collectionmentioning

confidence: 85%

“…The value ranges from 1.6 to 24.8, the average value is 12.4. As shown in Table 1, the AF can be identified as three class (Zhang et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Assessment of tectonic activity based on the geomorphic indices in the middle reaches of the upstream of Jinsha River, China

Liu

et al. 2021

Geological Journal

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“…The NW-SE striking faults here mostly follow the course of the Qianhe River in the Qianhe Graben, from northwest to southeast in the study area. Topographically, the TGF, a normal fault, follows the boundary between the southwestern Ordos Block and Loess Platform (Figure 1) [44,45], and it cuts the Loess Platform deeply in the southeast Qianhe Graben, as characterized by straight lineaments in three-dimensional (3D) images [46]. Moreover, previous studies investigated the Quaternary activity of the QMF, displaying left-lateral slip in kinematics with rates ranging from 0.5 to 1.5 mm/year [46].…”

Section: Geological Backgroundmentioning

confidence: 98%

“…The morphology of the area is formed by the four main active faults, with high elevation on both sides but low elevation in the middle. The Taoyuan-Guichuansi Fault (TGF), Guguan-Guozhen Fault (GGF), Qianyang-Biaojiao Fault (QBF), and Qishan-Mazhao Fault (QMF) strike northwest-southeastward (NW-SE) ( Figure 1) [44], with an inclination of 50-60 • , constituting the boundary between Precambrian and Quaternary. The NW-SE striking faults here mostly follow the course of the Qianhe River in the Qianhe Graben, from northwest to southeast in the study area.…”

Section: Geological Backgroundmentioning

confidence: 99%

Fractal and Multifractal Characteristics of Lineaments in the Qianhe Graben and Its Tectonic Significance Using Remote Sensing Images

Liu

Han

et al. 2021

Remote Sensing

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The distribution and characteristics of geological lineaments in areas with active faulting are vital for providing a basis for regional tectonic identification and analyzing the tectonic significance. Here, we extracted the lineaments in the Qianhe Graben, an active mountainous area on the southwest margin of Ordos Block, China, by using the tensor voting algorithm after comparing them with the segment tracing algorithm (STA) and LINE algorithm in PCI Geomatica Software. The main results show that (1) the lineaments in this area are mostly induced by the active fault events with the main trending of NW–SE, (2) the box dimensions of all lineaments, NW–SE trending lineaments, and NE–SW trending lineaments are 1.60, 1.48, and 1.44 (R2 > 0.9), respectively, indicating that the faults exhibit statistical self-similarity, and (3) the lineaments have multifractal characteristics according to the mass index τ(q), generalized fractal dimension D(q), fractal width (Δα = 2.25), fractal spectrum shape (f(α) is a unimodal left-hook curve), and spectrum width (Δf = 1.21). These results are related to the tectonic activity in this area, where a higher tectonic activity leads to more lineaments being produced and a higher fractal dimension. All of these results suggest that such insights can be beneficial for providing potential targets in reconstructing the tectonic structure of the area and trends of plate movement.

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Tectonic geomorphology of the Aras drainage basin (NW Iran): Implications for the recent activity of the Aras fault zone

2019

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Complex geology and tectonics of the NW Iran, the Caucasus region, and Eastern Turkey, are responsible for the present‐day landscapes of the region. The Aras drainage basin located in Iran, Azerbaijan and Armenia borders, provides an appropriate geographical environment for systematically studying the landforms produced or modified by active tectonic processes. Several morphometric indices were calculated for 114 sub‐basins to assess relative tectonic activity levels. Results were evaluated using two different methods; Index of Active Tectonics (IAT) and Analytical Hierarchy Process (AHP) methods. IAT results show that 2% of the sub‐basins belong to very high, 25% to high, 46% to moderate and 27% to low tectonic activity classes. AHP results, display that 12% of the sub‐basins belong to very high, 25% to high, 43% to moderate, and 20% to low tectonic activity classes. Results of both methods show approximate consistency and indicate that the tectonic activity along the Aras drainage basin is moderate to high and decreases from southwest to the northwest which is probably due to terminating fault branches in young unconsolidated deposits or strain partitioning processes. The major fault zones (e.g., Aras, Pambak–Sevan–Sunik, Akera, and Moghan fault zones) include areas with very high and high tectonic activity classes. Accordingly, the uplift rates have been estimated as >0.5 mm/yr for central and western parts, whereas the uplift rates are relatively less in the eastern part (<0.5 mm/yr). The Aras fault zone includes five active structural segments that the main Aras and Horadiz segments of them show relatively higher tectonic activity.

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Geomorphic evolution and neotectonics of the Qianhe River Basin on the southwest margin of the Ordos Block, North China

Cited by 27 publications

References 43 publications

Assessment of tectonic activity based on the geomorphic indices in the middle reaches of the upstream of Jinsha River, China

Assessment of tectonic activity based on the geomorphic indices in the middle reaches of the upstream of Jinsha River, China

Fractal and Multifractal Characteristics of Lineaments in the Qianhe Graben and Its Tectonic Significance Using Remote Sensing Images

Tectonic geomorphology of the Aras drainage basin (NW Iran): Implications for the recent activity of the Aras fault zone

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