Crustal structure of Hubei Province of China from teleseismic receiver functions: Evidence for lower crust delamination

Huang, Rong; Zhu, Lupei; Xu, Yixian

doi:10.1016/j.tecto.2014.09.001

Cited by 33 publications

(12 citation statements)

References 51 publications

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“…6; He et al, 2013He et al, , 2015Huang, 2014;Huang et al, 2014). This is based on (1) a receiver function analysis of teleseismic P-wave which testifies a significant eastwest crustal thickness increase (Huang et al, 2014); (2) a bulk crustal Vp/Vs ratio mapping which reveals a distinct contrast of the crustal structure and composition between the two flanks of the Jiujiang-Shitai buried fault (He et al, 2013); (3) seismic studies that indicate a remarkable gap of Moho-discontinuity between the western and eastern parts (Huang, 2014); and (4) results of aeromagnetic and gravity anomalies Gu and Wang, 2014;Xiong et al, 2015) and a deep seismic reflection profiling (location in Fig. 1, Xiong et al, 2016) which together suggest the existence of a frozen subduction zone representing the relics of the pre-Neoproterozoic suture between the western and eastern parts of the Yangtze Block.…”

Section: Contrasting Evolutionary Trajectories Between Western and Eamentioning

confidence: 99%

Nature and Evolution of Pre‐Neoproterozoic Continental Crust in South China: A Review and Tectonic Implications

Kai

Dong

Yao

et al. 2020

Acta Geologica Sinica (Eng)

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South China as an amalgamation of the Yangtze and Cathaysia blocks is composed of Archean to Mesoproterozoic basement overlain by Neoproterozoic and younger cover. Both the constituent Yangtze and Cathaysia blocks contain well‐preserved Neoproterozoic rocks that have been extensively studied in terms of the age and tectonic nature, but less is known about their earlier crustal history due to the incomplete rock record. Recent efforts in investigating the yet survived crustal nature based on isotopic and elemental signatures preserved in igneous and sedimentary rocks have steadily improved our knowledge about the pre‐Neoproterozoic continental crustal evolution in South China. In this paper, we summarize the up‐to‐date pre‐Neoproterozoic records, including petrological, geochronological, geochemical and geophysical data, across South China, and discuss its spatiotemporal patterns of the pre‐Neoproterozoic crust and the relevant tectonic events. While the xenocrystic/inherited and detrital zircon records suggest widespread Archean (mainly ca. 2.5 Ga) crustal components within both the Yangtze and Cathaysia blocks, exposed Archean rocks are only limited to isolated crustal provinces in the Yangtze Block. These Archean rocks are dominated by TTGs (tonalite‐trondhjemite‐granodiorite) with varied ages (3.3–2.5 Ga) and zircon Hf isotopes, indicating a compositionally heterogeneous nature of the Archean Yangtze Block and, by inference, the development of multiple ancient terranes. The early Paleoproterozoic (2.4–2.2 Ga) tectonomagmatic events characterize the western Yangtze Block and are supportive of an east‐west subdivision of the Yangtze basement, whereas the late Paleoproterozoic (2.1–1.7 Ga) orogeneses may have affected a larger area covering both the western and eastern parts of the Yangtze Block, and also the Cathaysia Block. The eastern Yangtze Block with generally northeastward‐younging late Paleoproterozoic magmatism and metamorphism likely experienced a prolonged 2.05–1.75 Ga orogenic process welding the various Archean proto‐continents, consistent with the documentation of a buried late Paleoproterozoic orogenic belt imaged by deep seismic profiling from its central part and of a slightly older ophiolitic mélange in the northern part. The Cathaysia Block was probably involved in a short‐lived 1.9–1.8 Ga orogenic event. The two orogeneses overlapped in time and may have contributed to the cratonization of a possible unified South China, and are referred to be linked with the assembly of the Nuna Supercontinent. The subsequent late Paleoproterozoic to early Mesoproterozoic rift successions and intrusions (1.7–1.5 Ga) in the southwestern Yangtze Block, and the ca. 1.43 Ga rifting in Hainan Island of the Cathaysia Block could be responses to the Nuna break‐up. Late Mesoproterozoic (1.2–1.0 Ga) magmatism of varied age and nature in different localities of the Yangtze Block is reflective of a complex tectonic process in the context of the assembly of the Rodinia Supercontinent. Similar‐aged metamorphism (...

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Section: Contrasting Evolutionary Trajectories Between Western and Eamentioning

confidence: 99%

Nature and Evolution of Pre‐Neoproterozoic Continental Crust in South China: A Review and Tectonic Implications

Kai

Dong

Yao

et al. 2020

Acta Geologica Sinica (Eng)

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“…We develop a semiautomatic H‐κ‐ c package to perform the above steps 1 to 4. The input is the R‐RFs from standard RF processing (e.g., Huang et al, , ; Zhu & Kanamori, ; see section ). A reference velocity model (e.g., IASP91) is required for the incident moveout corrections.…”

Section: Methodsmentioning

confidence: 99%

“…For each station, all RFs were sorted by BAZ and inspected to identify and remove poor RFs (with inconsistent waveforms or obviously wrong negative direct P pulses). RFs with similar BAZs and ray parameters were stacked to remove clustered events (e.g., Huang et al, , ).…”

Section: Application To Real Datamentioning

confidence: 99%

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A Generalized H‐κ Method With Harmonic Corrections on Ps and Its Crustal Multiples in Receiver Functions

Song

Wang

et al. 2019

JGR Solid Earth

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The H-κ method (Zhu & Kanamori, 2000, https://doi.org/10.1029/1999JB900322) has been widely used to estimate the crustal thickness (H) and the ratio of P to S velocities (V P /V S ratio, κ) with receiver functions. However, in regions where the crustal structure is complicated, the method may produce biased results, arising particularly from dipping Moho and/or crustal anisotropy. H-κ stacking in case of azimuthal or radial anisotropy with flat Moho has been proposed but not for cases with plunging anisotropy and dipping Moho. Here we propose a generalized H-κ method called H-κ-c, which corrects for these effects first before stacking. We consider rather general cases, including plunging anisotropy and dipping interfaces of multiple layers, and use harmonic functions to correct for arrival time variations of Ps and its crustal multiples with back azimuth (θ). Systematic synthetic tests show that the arrival time variations can be well fitted by cosθ and cos2θ functions even for very complex crustal structures. Correcting for the back azimuthal variations significantly enhances H-κ stacking. We verify the feasibility of the H-κ-c method by applying it to 40 permanent stations in various geological setting across the Mainland China. The results show clear improvement after the harmonic corrections, with clearer multiples and stronger stacking energy, as well as more reliable H-κ values. Large differences in H (up to 5.0 km) and κ (up to 0.09) between the new and traditional methods occur mostly in mountainous regions, where the crustal structure tends to be more complex. We caution in particular about systematic bias when the traditional method is used in the presence of dipping interfaces. The modified method is simple and applicable anywhere in the world.Plain Language Summary Crustal thickness and crustal V P /V S ratio are important parameters for regional geology and tectonics. We propose a method that corrects for the effect of crustal anisotropy and dipping interface on receiver functions, which results in more reliable estimation of crustal thickness and V P /V S ratio. Synthetic tests and application to real data suggest that this method is powerful and widely applicable.

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“…The complex transitional Moho observed here is to the east of the expected crustal transition zone, the boundary between the mixed peri-Laurentian terranes, and the Laurentian platform crust (the hinge line). A double Moho has also been invoked to characterize lower crustal delamination (Huang et al, 2014).…”

Section: Complex Transitional Mohomentioning

confidence: 99%

Moho Structure Across the Backarc‐Craton Transition in the Northern U.S. Cordillera

et al. 2020

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In southern Canada and the northern United States, the present-day western edge of the North American craton (Laurentia) is marked by a profound change in lithospheric thickness, from <100 km within a hot backarc setting beneath the Cordillera to >200 km beneath the craton. A nearly uniformly flat Moho in the backarc region of southern Canada has been interpreted as a young feature that was produced by lower crustal channel flow. The tectonic environment of the southern Canadian Cordillera extends southward to the Lewis and Clark shear zone in the northern United States, where previously deployed EarthScope Transportable Array stations provide coverage on a ≈70 km grid. Here, data from Transportable Array stations are used to investigate teleseismic P to S receiver functions of crustal structure across the craton-backarc transition, coupled with lithospheric structure derived from a recent global tomographic model. These images suggest that, north of the Lewis and Clark shear zone, the shallower Moho beneath the Cordillera has encroached on the craton, creating a narrow complex transition zone. To the south, a step-like change in crustal thickness is observed, and the complex Moho transition zone is absent. Taken together with other geological and geophysical data, these observations suggest that a young Moho has progressed eastward accompanied by thermal and/or mechanical modification of the Laurentian lithosphere. Plain Language Summary We observe an interesting deep crustal and lithospheric feature in the north western United States. In the crust it appears like a complex or double layer at the crust and mantle interface. Deeper in the mantle lithosphere, there appears to be a lobate west dipping anomaly. Since this feature aligns with heat flow indicators suggesting it occurs at the edge of a Cordilleran wide high heat flow, we propose the formation of this feature is related to the high heat flow. We propose this crust and lithospheric feature is relatively young and that it is the relict North American lithosphere being eroded back by a combination of mantle flow and heat diffusion at the edge of the ancient Northern American margin.

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Crustal structure of Hubei Province of China from teleseismic receiver functions: Evidence for lower crust delamination

Cited by 33 publications

References 51 publications

Nature and Evolution of Pre‐Neoproterozoic Continental Crust in South China: A Review and Tectonic Implications

Nature and Evolution of Pre‐Neoproterozoic Continental Crust in South China: A Review and Tectonic Implications

A Generalized H‐κ Method With Harmonic Corrections on Ps and Its Crustal Multiples in Receiver Functions

Moho Structure Across the Backarc‐Craton Transition in the Northern U.S. Cordillera

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