Complex structural fault system and distributed deformation across the Big Bend of the Red River fault, Yunnan, China

Xu, Wen; Ma, Shuping; Fang, Lihua; Liang, Mingjian; Du, Fukuan; Feng, Li; Zhao, Xiaoyan

doi:10.1016/j.pepi.2022.106942

Cited by 10 publications

(6 citation statements)

References 36 publications

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“…In terms of geological and geomorphological features, no significant displacements were found along the RRF that were cut through and dislocated by the XJF. Instead, the QJF, SJF, and RRF exhibit a geometric pattern of southwestward bending (Schoenbohm et al., 2006; Wen et al., 2022). The spatial variations in 3 He/ 4 He ratios can be explained by differences in fault‐dependent permeability, extension, and seismic magnitude (Caracausi et al., 2022; W. Liu et al., 2023).…”

Section: Discussionmentioning

confidence: 99%

“…Fewer thermal springs with bubbling gas, lower gas 3 He/ 4 He ratios, lower shear strain rates, stable reservoir temperature fields, and extremely low historical seismicity in the ICB (Figure 7) indicate that the ICB is a stable block unaffected by extrusion, which is another reason for the XJF failing to cut through the RRF and moving southward (Figure 8). Wang, Zhang, et al (2014) and Wen et al (2022). GPS velocity field from Z.…”

Section: Tectonic Features Revealed By Fluid Geochemistrymentioning

confidence: 99%

“…The RRF is the northeastern boundary of the Indo‐Chinese block (ICB) and the southwestern boundary of the SYB, with a distinct arcuate division in the geomorphology (Replumaz et al., 2001; Schoenbohm et al., 2006); the arcuate curvature is believed to result from the rotational extrusion of the SYB (Allen et al., 1984; E. Wang et al., 1998; Wen et al., 2022). The RRF is divided into three segments in China.…”

Section: Geological Settingmentioning

confidence: 99%

“…The resistivity data are according to Yu et al (2020); Crustal thicknesses are according to T. Wu et al (2016); the LAB is based on Hu et al (2015); and the fault zones are according to Y Wang, Zhang, et al (2014). andWen et al (2022). GPS velocity field from Z Li et al (2020),.…”

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confidence: 99%

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Geochemical Characteristics of Thermal Springs and Insights Into the Intersection Between the Xiaojiang Fault and the Red River Fault, Southeastern Tibet Plateau

Shao,

Liu,

et al. 2024

Geochem Geophys Geosyst

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During the ongoing uplift and expansion of the southeastern margin of the Tibetan Plateau, the front edge of the Sichuan‐Yunnan rhombic block (SYB) has experienced intense tectonic activity and frequent seismicity. In this study, the fluid geochemistry in the primary active faults at the front edge of the SYB was investigated, with the aim of understanding the tectonic activity and intersection relationship between the Xiaojiang fault (XJF) and the Red River fault (RRF). Thermal spring water and gases exhibit a coupled spatial distribution relationship; relatively high ion concentrations and 3He/4He ratios (Rc/Ra ratios of 0.21 to 0.62Ra) are observed along the RRF, Qujiang fault (QJF), and Shiping‐Jianshui fault (SJF). Multidisciplinary research results have indicated that mantle‐derived intrusion has been detected in the crust beneath the QJF and SJF. The current tectonic activity in the front edge of the SYB remains intense, with compressive stresses shifting toward the western side of the XJF and accumulating on the QJF and SJF. This has led to the development of fractures, enhancing the water–rock interaction and deep‐derived gas degassing along the faults. The unmixing characteristics of fluids at the intersection area of these two faults suggest the absence of conduits for fluid migration between the faults. Owing to the lower gas 3He/4He ratios, lower shear strain rates, stable reservoir temperature field, and extremely low historical seismicity in the Indo‐Chinese block, it is speculated that the current movement of the XJF may not cut through the RRF and continue southward.

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Section: Discussionmentioning

confidence: 99%

Section: Tectonic Features Revealed By Fluid Geochemistrymentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

mentioning

confidence: 99%

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Geochemical Characteristics of Thermal Springs and Insights Into the Intersection Between the Xiaojiang Fault and the Red River Fault, Southeastern Tibet Plateau

Shao,

Liu,

et al. 2024

Geochem Geophys Geosyst

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“…Most earthquakes along giant fault systems in the SETP occur in the upper crust, and are common in the northern part of ARSZ and the Xiao Jiang Fault system (Wang et al., 2020). Based on the calculated density, Vp and Vp / Vs , we discuss seismic imaging of present‐day geophysical information of the crustal density structure (Shi et al., 2015), the velocity structure obtained from deep seismic wide‐angle reflection/refraction (Wang et al., 2014; Wen et al., 2022), and Vp / Vs velocity ratio (Hou et al., 2023) across the ARSZ.…”

Section: Discussionmentioning

confidence: 99%

Thermal and Physical Properties of Barrovian Metamorphic Sequence Rocks in the Ailao Shan‐Red River Shear Zone, and Implications for Crustal Channel Flow

Ji,

Liu,

Palin

et al. 2024

JGR Solid Earth

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The collisional history between Greater India and the Eurasian plate has been well constrained by the study of exhumed Barrovian metamorphic sequence (BMS) rocks in the Himalayan Range. However, in the southeastern Tibetan Plateau, the collisional records have been obscured by intense, regional‐scale strike‐slip overprinting and recrystallization. Here, in BMS rocks from the Ailao Shan–Red River shear zone (ARSZ), we report the first discovery of a >250 km long, high‐pressure (high‐P) granulite belt (>1.0 GPa), identified by the presence of relict kyanite and associated decompression reaction textures. Petrological phase equilibrium modeling showed that exposed micaschists in the region represent exhumed middle crust (20–25 km, 600–670°C), while the high‐P granulite rocks are remnants of thickened lower crust (45–55 km, 800–850°C). This indicates that the northeast edge of the ARSZ experienced an additional ∼25 km of uplift and exhumation compared to the southwest side, facilitated by brittle thrusting/imbrication along the Ailao Shan fault (micaschists) and ductile extrusion along the Red River fault (granulite). Geochronological study shows that the upper portion of the BMS preserves older metamorphic ages (52–34 Ma) than the lower portion (32–29 Ma), which was attributed to spatial variation in cooling rates. Using calculated P–T–t–d paths, we also examined variation in density and seismic wave speeds for BMS in the ARSZ. Our data correlate with fieldwork conducted elsewhere within the Himalayan Range indicating that the kyanite to sillimanite transition zone may serve as a “cap” for the horizontal migration of melt within the lower crust.

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Segmental nature of the Red River fault revealed by seismic anisotropy and geological structures

Li,

Gao

2024

Sci. China Earth Sci.

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Complex structural fault system and distributed deformation across the Big Bend of the Red River fault, Yunnan, China

Cited by 10 publications

References 36 publications

Geochemical Characteristics of Thermal Springs and Insights Into the Intersection Between the Xiaojiang Fault and the Red River Fault, Southeastern Tibet Plateau

Geochemical Characteristics of Thermal Springs and Insights Into the Intersection Between the Xiaojiang Fault and the Red River Fault, Southeastern Tibet Plateau

Thermal and Physical Properties of Barrovian Metamorphic Sequence Rocks in the Ailao Shan‐Red River Shear Zone, and Implications for Crustal Channel Flow

Segmental nature of the Red River fault revealed by seismic anisotropy and geological structures

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