Continental dynamics of Eastern China: Insights from tectonic history and receiver function analysis

He, Chuansong; Santosh, M.; Dong, Shuwen

doi:10.1016/j.earscirev.2015.02.006

Cited by 19 publications

(4 citation statements)

References 297 publications

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“…Mineralogy of rocks plays a key role in variation of Vp/Vs ratio. For lower crustal rocks, low Vp/Vs ratio (< 1.75) or low Poisson's ratio (s<0.26) for the Mesozoic-Cenozoic crust is considered to indicate a predominantly felsic composition and intermediate s (0.26À0.28) to high s (> 0.28) are the characteristics for intermediate to mafic composition (Zandt & Ammon 1995;Christensen 1996;He et al 2014He et al , 2015.The Vp/Vs values are around 1.73 for felsic rocks, whereas for mafic rocks, Vp/Vs values tends to increase. The values of bulk crustal ratio are slightly less than lower crustal Vp/Vs ratio (about 0.02).…”

Section: Discussionmentioning

confidence: 99%

Crustal imaging of the Northwest Himalaya and its foredeep region from teleseismic events

Saikia

Chopra

Baruah

et al. 2015

Geomatics, Natural Hazards and Risk

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Over 450 receiver functions from 8 broadband stations located in the IndoGangetic plain and Northwest Himalayan region are analyzed to examine the crustal properties across the contiguous region. We identified the P-to-S phase beneath each station and estimated the crustal thickness from time delay of this phase with respect to the direct P arrival. With the help of the slant stacking technique, we determined bulk crustal chemical properties and validated our estimate of crustal thickness. The Moho was encountered in the Indo-Gangetic plain at an average depth of 33 km and thickened towards the Northwest Himalaya with the Moho depth varying from 37 to 52 km. The thickest crust matched the highest topography, which is strong evidence of the occurrence of a crustal root of the mountain range. The time domain iterative linearized inversion technique is used to invert radial receiver functions to wave velocity structures for both tectonic regimes. From the forward modelling, we found mid-crustal lowvelocity layers at different patches at a depth of 10À30 km in the Northwest Himalaya region. The presence of melts may be inferred in the mid crust with high values of Poisson ratio (s 0.260) for the stations in the Northwest Himalaya. Towards south in the Indo-Gangetic alluvium plain, we estimated a medium to higher value of Poisson ratio (0.240 s 0.290), but velocity modelling implies absence of an intracrustal low-velocity zone around the region.

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Section: Discussionmentioning

confidence: 99%

Crustal imaging of the Northwest Himalaya and its foredeep region from teleseismic events

Saikia

Chopra

Baruah

et al. 2015

Geomatics, Natural Hazards and Risk

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“…There is also geophysical evidence that the western and eastern parts of the Yangtze Block are distinctly contrasted in terms of the crustal properties, the boundary of which roughly follows a curved line coinciding with the southwestern continuation of the buried Shitai-Jiujiang fault ( Fig. 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.…”

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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“…It has been shown that in some cases, high-and lowvelocity relics generated by subducted slab or crustal and mantle lithospheric delamination resulting in the upwelling of the asthenospheric mantle can be retained for a long time, even a couple of billion years (Cook et al, 1999;Balling, 2000;Svenningsen et al, 2007;Zhai et al, 2007;He et al, 2015). These low-and high-velocity structures can be imaged by tomography (Zhao et al, 1992(Zhao et al, , 1994Zhao et al, 2016).…”

Section: Mechanism Of the Emeishan Lip Formationmentioning

confidence: 99%

Mantle roots of the Emeishan plume: an evaluation based on teleseismic P-wave tomography

Santosh

2017

Solid Earth

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Abstract. The voluminous magmatism associated with large igneous provinces (LIPs) is commonly correlated to upwelling plumes from the core-mantle boundary (CMB). Here we analyse seismic tomographic data from the Emeishan LIP in southwestern China. Our results reveal vestiges of delaminated crustal and/or lithospheric mantle, with an upwelling in the upper mantle beneath the Emeishan LIP rather than a plume rooted in the CMB. We suggest that the magmatism and the Emeishan LIP formation might be connected with the melting of delaminated lower crustal and/or lithospheric components which resulted in plume-like upwelling from the upper mantle or from the mantle transition zone.

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Continental dynamics of Eastern China: Insights from tectonic history and receiver function analysis

Cited by 19 publications

References 297 publications

Crustal imaging of the Northwest Himalaya and its foredeep region from teleseismic events

Crustal imaging of the Northwest Himalaya and its foredeep region from teleseismic events

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

Mantle roots of the Emeishan plume: an evaluation based on teleseismic P-wave tomography

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