Upper crustal velocity structure of the Ailaoshan-Red River shear zone and its implication for Cenozoic tectonic-magmatic activity: Evidence from ambient noise tomography using short-period dense seismic array

Zheng, Mengjie; Bai, Zhiming; Xu, Tao; Badal, José

doi:10.1016/j.pepi.2021.106643

Cited by 9 publications

(4 citation statements)

References 59 publications

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“…On the other hand, previous studies using data from a short‐period dense array in the same study region show that the crustal averaged Poisson's ratio in the ARSZ is significantly higher than that in the surrounding areas (L. Zhang et al., 2020). The upper crustal velocity structures revealed by the short‐period dense array contain a high‐velocity zone under the gold deposits, indicating granitoid intrusions produced by Cenozoic magmatism (Zheng et al., 2021). These results suggest that lower crustal partial melting results from the Cenozoic magmatism beneath the RRF rather than the southeastward transportation of the lower crustal flow.…”

Section: Cenozoic Magmatic Activity Under the Arszmentioning

confidence: 99%

“…Recent studies using seismic data from short‐period nodes have revealed detailed crustal features. Ambient noise tomography shows a high‐velocity zone in the upper crust (6–10 km), which is related to the Ailaoshan metallogenic belt (Zheng et al., 2021). A High‐frequency receiver function study has provided accurate crustal thicknesses and average crustal

{V}_{P}/{V}_{S}

ratios via

H-\kappa

stacking (L. Zhang et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

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Crustal and Uppermost Mantle Heterogeneities Across the Ailaoshan Red River Shear Zone, SE Tibet: Implications for Cenozoic Magmatic Activity

Huang

et al. 2022

JGR Solid Earth

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Section: Cenozoic Magmatic Activity Under the Arszmentioning

confidence: 99%

{V}_{P}/{V}_{S}

ratios via

H-\kappa

stacking (L. Zhang et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Crustal and Uppermost Mantle Heterogeneities Across the Ailaoshan Red River Shear Zone, SE Tibet: Implications for Cenozoic Magmatic Activity

Huang

et al. 2022

JGR Solid Earth

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“…The data for the investigation were obtianed from a dense seismic array installed in the southeastern Tibet (Zhang et al, 2020;Zheng et al, 2021). The roughly east-west array spans three tectonic regions, namely, the Lanping-Simao Basin, the Ailaoshan Orogenic Belt, and the South China Block (Figure 1).…”

Section: Datamentioning

confidence: 99%

Detailed crustal deformation in the Ailaoshan Orogenic Belt revealed by receiver functions from a dense array

Wu,

Xu,

Bai

2023

Front. Earth Sci.

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The Ailaoshan Orogenic Belt (AOB), located at the southeastern boundary of the Tibetan Plateau, is an ideal place for investigating the mechanisms of lateral growth of Tibet. Using the data recorded by a dense seismic array across the Ailaoshan belt, we investigate the detailed lateral variations of crustal anisotropy on the basis of Pms phase of receiver functions. Remarkable crustal anisotropy is observed throughout this study region with a mean delay time of 0.33 ± 0.19 s, indicating the anisotropy primarily originates in the middle-lower crust. The fast directions beneath the AOB including the Ailaoshan-Red River shear zone (ARRSZ) and its western low-grade metamorphic unit generally align with the NW-SE strike of ARRSZ. The weak anisotropy in the South China Block (SCB) argues that the block is relatively stable, with limited internal deformation. Meanwhile, the anisotropy beneath the western boundary of the SCB is strong, and the N-S oriented fast direction is influenced by both the crustal stress and Xiaojiang Fault. Combining the high Vp/Vs and significant lateral variations of crustal anisotropy parameters, we suggest that the strike-slip motion along the ARRSZ induces the partial melting and pronounced anisotropy in the middle-lower crust of AOB, without the presence of crustal flow. The differences between crustal and mantle anisotropy indicate crust-mantle decoupling deformation of the AOB, supporting the block extrusion model occurring only in the crustal scale as the primary deformation pattern.

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“…After the automatic measurements, we performed a cluster analysis as described by Zheng et al (2021) for quality control. In contrast to the previous study, we employed Tukey's test as a specific criterion to identify and reject deficient or poor measurements; that is, for a given period, a measurement of less than Q 1 − 1.5I Q R or larger than Q 3 + 1.5I Q R is considered an anomaly, where Q 1 , Q 3 and I Q R denote the first quartile, the third quartile and the interquartile range, respectively.…”

Section: Rayleigh Wave Dispersionmentioning

confidence: 99%

Upper crustal structure beneath the Qin-Hang and Wuyishan metallogenic belts in Southeast China as revealed by a joint active and passive seismic experiment

Zheng

Lü

et al. 2022

Geophysical Journal International

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Summary Southeast China is one of the most important polymetallic metallogenic provinces in the world. However, distinct differences in the type and origin of the mineral deposits are present between the major metallogenic belts in this province. To deepen our knowledge of this regional metallogenic setting, investigate the factors controlling its metallogenic differences, and explore the feasibility of active and passive seismic imaging, we performed a multibatch seismic experiment using active and passive sources with the help of 437 short-period seismographs deployed across the Qin-Hang and Wuyishan metallogenic belts in Southeast China. We resolved the S-wave velocity structure beneath the profile using ambient noise tomography and derived a Vp/Vs model by combining with a published P-wave model. A good correlation between the obtained seismic velocity models and geological observations are observed. The Proterozoic volcanic-sedimentary rock series and the Fuzhou-Yongfeng sedimentary basin are identified by low P- and S-wave velocities, high Vp/Vs ratios, and low S-wave velocity perturbations. Within the core of the Wuyishan Metallogenic Belt, several narrow, elongated, and low seismic velocity anomalies are considered to be signs of the nearby fault zones, and these anomalies provide reference information on the extension and pattern of these faults at depth. Combined with the geological and mineralogical evidence, we propose that theses faults function as ore-guiding structures and facilitate the formation of regionally representative mineral species and metal assemblages.

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Upper crustal velocity structure of the Ailaoshan-Red River shear zone and its implication for Cenozoic tectonic-magmatic activity: Evidence from ambient noise tomography using short-period dense seismic array

Cited by 9 publications

References 59 publications

Crustal and Uppermost Mantle Heterogeneities Across the Ailaoshan Red River Shear Zone, SE Tibet: Implications for Cenozoic Magmatic Activity

Crustal and Uppermost Mantle Heterogeneities Across the Ailaoshan Red River Shear Zone, SE Tibet: Implications for Cenozoic Magmatic Activity

Detailed crustal deformation in the Ailaoshan Orogenic Belt revealed by receiver functions from a dense array

Upper crustal structure beneath the Qin-Hang and Wuyishan metallogenic belts in Southeast China as revealed by a joint active and passive seismic experiment

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