Tectonic evolution of the Tongbai-Hong’an orogen in central China: From oceanic subduction/accretion to continent-continent collision

Liu, Xiaochun; Li, Sanzhong; Jahn, Bor‐ming

doi:10.1007/s11430-015-5145-z

Cited by 66 publications

(47 citation statements)

References 120 publications

(176 reference statements)

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“…Deep subduction of oceanic crust can also cause HP–UHP metamorphism and even exhume UHP rocks to a crustal depth with partial melting material (Liu et al, ; Liu et al, ). In our models, oceanic crust coming from the left subduction zone remained under the residual lithosphere at a depth of about 50–200 km, where a phase transformation of mafic oceanic crustal materials to denser eclogite has occurred (Figures 3–6).…”

Section: Modeling Resultsmentioning

confidence: 99%

“…According to previous geological, geochemical, and geophysical studies (Jiang et al, ; Li, Kusky, et al, ; Li, Zhao, et al, ; Liu et al, ), the evidences or phenomena related to the post‐orogenic collapse of the Western Dabie Orogen include: (a) lithosphere delamination under the collision zone; (b) voluminous magmatism, which may reflect upwelling of asthenospheric mantle; (c) regional extension deformation, which reconstructs the previous nappe thrust structures formed during the collision stage, but did not destroy it; and (d) stagnant slab‐related high‐V anomaly, which may correspond to the detached lithosphere and magmatic activity. This implies that the results of computed models must be consistent with these evidences of the Western Dabie Orogen.…”

Section: Discussionmentioning

confidence: 99%

“…The Western Dabie Orogen as a product of the collision between the North China Block and South China Block, located in the middle segment of the Qinling–Tongbai–Dabie–Sulu orogenic belt (Figure ), has also undergone post‐orogenic extension and collapse during the Early Cretaceous, revealed by two episodes of magmatization (Li, Suo, et al, ; Liu et al, ; Zheng, ), typical extensional tectonics (Li et al, ; Li et al, ; Li, Kusky, et al, ; Li, Kusky, et al, ; Zhou et al, , ) and lithospheric architecture (Jiang et al, ; Xu et al, ). Most researchers have suggested that the mechanism of unrooting and collapse in the Dabie Orogen may be attributable to the Rayleigh–Taylor gravitational instabilities and subsequent anatexis triggered by subduction of the Paleo‐Pacific Plate (Li, He, & Wang, ; Xu et al, ; Zheng, ), because of the geodynamic setting of the Mesozoic magmatism in eastern Eurasia (Wu, Xu, Gao, & Zheng, ).…”

Section: Introductionmentioning

confidence: 99%

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Dynamic processes and mechanisms for collision to post‐orogenic extension in the Western Dabie Orogen: Insights from numerical modeling

Dai

et al. 2017

Geological Journal

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Post‐orogenic extension is the last stage of a tectonic process towards the end of each Wilson cycle in both ancient and modern continental collisional zones, but their dynamics, controlling factors, and roles for the post‐orogenic extension processes remain debatable. We present the first two‐dimensional thermo‐mechanical numerical model of double sutures inspired by the Western Dabie Orogen to investigate the dynamics of post‐orogenic extension. Our results indicate that the pro‐continent re‐subduction can delay or stop regional extensional deformation and subsequent voluminous magmatic activity caused by slab breakoff in the collision zone. After the end of the collision stage, the re‐subduction slab under the residual lithosphere in the model with lower convergence, as a strong unit, can maintain the gravitational balance of the whole post‐orogen system, whether crust eclogitization is considered or not. If the oceanic crust and micro‐continental crust eclogitization are applied to the model with medium convergence, the lower crust and the residual lithospheric mantle in the collision zone will be completely removed by the gravitational instability and upwelling of asthenospheric mantle. The lithospheric architecture of this model with the medium convergence and crust eclogitization is very similar to the present‐day tomography. However, in the model with higher convergence, lithosphere delamination can occur only by upwelling of asthenosphere, whether crustal eclogitization is considered or not. On the basis of a comparison of numerical results with field data from the Western Dabie Orogen, we suggest that the dynamics of post‐orogenic extension in the Western Dabie Orogen is controlled by re‐subduction of the North China Block and crustal eclogitization after high pressure/ultrahigh pressure collision. Thus, the observed regional extensional deformation and voluminous magmatic activity in the Western Dabie Orogen can be self‐consistently explained by interactions between the two sutures and crustal eclogitization.

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Section: Modeling Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic processes and mechanisms for collision to post‐orogenic extension in the Western Dabie Orogen: Insights from numerical modeling

Dai

et al. 2017

Geological Journal

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“…The Qinling Orogen is considered to have been formed by the collision of the North and South China blocks (Bader et al, ; Cao et al, ; Dong, Zhang, Christoph, et al, ; Dong, Zhang, Feubauer, et al, ; Li, Liu, Li, Guo, & Chamberlain, ; Li, Liu, & Yang, ; Li et al, ; Li et al, ; Li et al, ; Li, Zhao, et al, ; Li, Jahn, et al, ; Liu, Li, & Jahn, ; Ratschbacher et al, ; Zhang, Meng, & Lai, ; Zhang, Zhang, Yuan, & Xiao, ; Zhao et al, ). The Qinling Orogen is an important segment of the Central China Orogen, which can be subdivided into four units, known as the southern margin of the North China Block, the North Qinling Belt, the South Qinling Belt, and the northern margin of the Yangtze Block.…”

Section: Introductionmentioning

confidence: 99%

Petrogenesis of the Sanshilipu gabbro complex in the Shangdan Suture: New constraints on evolution of the Qinling Orogen

Liu

Sun

2017

Geological Journal

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The Sanshilipu gabbro complex is located along the Shangdan Suture, which is important to understanding the evolution of the Qinling Orogen, Central China. The complex is mainly composed of norite, gabbro, and gabbro–diorite. Laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) zircon dating yields a weighted mean 206Pb/238U age of 414 ± 2.8 Ma, interpreted to represent the crystallization age of the gabbro complex. The complex has SiO2 contents ranging from 48.6 to 51.3 wt% with enrichment of Na relative to K, showing calc‐alkaline feature. The studied samples are characterized by an enrichment of large‐ion lithophile elements (Ba, Sr, and Pb) and depletion of HFSE (Nb, Ta, Zr, Hf, and Ti) and a large range of Nb/Ta ratios (3.7 to 11.8). They also have early flattened‐LREE distribution patterns. These geochemical characteristics indicate that the Sanshilipu gabbro complex was formed in an island‐arc environment. They have slightly enriched Sr–Nd isotope compositions with (87Sr/86Sr)i = 0.7047–0.7063 and ɛNd(t) from −0.44 to −4.63, indicating that the formation of the complex was involved in some subducted sediments and oceanic crust and fluid released from the subducted slab. The identification of island‐arc‐originated mafic rocks suggests that the onset time of the collision between the Yangtze Craton and the North China Craton should be younger than 415 Ma.

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“…At the end of the late Paleozoic-early Mesozoic, subduction and multi-level detachment/exhumation of the Yangtze plate formed the Tongbai-Hong'an-Dabie high pressure/ultrahigh pressure metamorphic rocks. During the late Mesozoic, the regional tectonic environment changed from compression to extension, massive magmatic emplacement and tectonic extrusion, resulting in high pressure/ultrahigh pressure metamorphic rocks outcropped on the surface and a structural pattern wide in the east and narrow in the west (Liu et al, 2015). The Qinling Mountains are mainly composed of the Southern margin of North China Plate, the North Qinling tectonic belt, the South Qinling tectonic belt, and the South Qinling foreland fold thrust belt (Zhang et al, 1996;Wang et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Phase Velocity Tomography of Rayleigh Wave in Qinling‐dabie and Its Adjacent Areas Using Ambient Seismic Noise

Wen-Xiu

Gao

et al. 2017

Chinese J of Geophysics

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The Qinling‐Dabie orogenic belt is located between the northeastern margin of the Tibetan Plateau and the Tan‐Lu fault; it was formed by the collision of Yangtze and North China blocks. We obtain the phase velocity of Rayleigh wave at the periods of 8∼35 s in the Qinling‐Dabie orogenic belt using ambient seismic noise recorded at 160 broad‐band stations from China digital seismic network. 24 month data have been cross‐correlated to yield the empirical Rayleigh wave Green's functions. Phase velocity dispersion curves are measured for each interstation path by frequency‐time analysis. The Rayleigh wave phase speed maps agree well with each other and show clear correlations with major tectonic structures. The Dabie is characterized by high velocity anomaly at 8 s but slow velocity at 14 s, indicating the influence of high pressure (HP)/ultrahigh pressure (UHP) metamorphic regions in the upper crust. At 25 s, the velocity varies from slow in the west to high in the east across the gravity gradient zone in the Taihang‐Wuling Mountains. This pattern mainly reflects the effect of crust thickness which is thicker in the west and thin in the east. The southern segment of Tan‐Lu fault shows different features across it at 14∼35 s, suggesting that the fault zone may extend down to the crust‐mantle boundary. The slow velocity close to the fault is probably caused by the hot material upwelling. More constraints are needed by further study. Obvious slow velocities at periods of 14∼25 s in South Qinglin and northeast Sichuan basin are observed. We could not determine whether this low velocity zone is due to the Tibetan lower crustal flow and/or the delamination of the South Qinglin now. Study of the 3‐D shear wave velocity structure in the crust and upper mantle is necessary to constrain the geodynamics of this region in the future.

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Tectonic evolution of the Tongbai-Hong’an orogen in central China: From oceanic subduction/accretion to continent-continent collision

Cited by 66 publications

References 120 publications

Dynamic processes and mechanisms for collision to post‐orogenic extension in the Western Dabie Orogen: Insights from numerical modeling

Dynamic processes and mechanisms for collision to post‐orogenic extension in the Western Dabie Orogen: Insights from numerical modeling

Petrogenesis of the Sanshilipu gabbro complex in the Shangdan Suture: New constraints on evolution of the Qinling Orogen

Phase Velocity Tomography of Rayleigh Wave in Qinling‐dabie and Its Adjacent Areas Using Ambient Seismic Noise

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