Two-stage Triassic exhumation of HP–UHP terranes in the western Dabie orogen of China: Constraints from structural geology

Li, Sanzhong; Kusky, Timothy; Zhao, Guochun; Liu, Xiaochun; Zhang, Guowei; Kopp, Heidrun; Wang, Lu

doi:10.1016/j.tecto.2010.05.010

Cited by 110 publications

(65 citation statements)

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“…Therefore, the D3 deformation is characterized by regionalscale to microscopic scale multi-order WNW-ESE trending gentle buckle folds, kinks and brittle-ductile shear zones ( Figure 4d). In the Late Triassic-Early Jurassic, the deformation in the Dabie Orogen is dominated by eastward ductile extrusion of the UHP core complex under contraction and coeval, local ductile extension around the core complex (Li et al, 2010b). Published and our new geochronologic data (Li et al, 2010b) reveal two different stages and types of Triassic extrusion for exhumation of HP-UHP rocks in east-central China.…”

Section: Geological Settingmentioning

confidence: 69%

“…In the Late Triassic-Early Jurassic, the deformation in the Dabie Orogen is dominated by eastward ductile extrusion of the UHP core complex under contraction and coeval, local ductile extension around the core complex (Li et al, 2010b). Published and our new geochronologic data (Li et al, 2010b) reveal two different stages and types of Triassic extrusion for exhumation of HP-UHP rocks in east-central China. Mica 40 Ar/ 39 Ar ages, ranging from 241 to 231 Ma, indicate a general Middle Triassic cooling probably driven by an early upward, southeastward extrusion during the collision between the north and South China Plates.…”

Section: Geological Settingmentioning

confidence: 69%

“…Here, we propose an alternative model that synthesizes, but is different from, current models including: (i) the Middle Triassic southeastward, upward extrusion models of Maruyama et al (1994) and Hacker et al (2000), (ii) the Late Triassic lateral, eastern extrusion model of Wang et al (2003) and Li et al (2010b) and (iii) Early Jurassic northdirected indentation model of Yin and Nie (1993). We integrate new deformation data into a regional Mesozoic tectonic framework to provide a detailed picture of spatialtemporal variations in tectonic boundaries and structural pattern between the Dabie-Sulu and the Jiangnan Orogens.…”

Section: Discussionmentioning

confidence: 99%

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Not all folds and thrusts in the Yangtze foreland thrust belt are related to the Dabie Orogen: Insights from Mesozoic deformation south of the Yangtze River

Zhao

Zhang

et al. 2010

Geological Journal

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The Yangtze foreland fold-and-thrust belt is located between the Mesozoic Dabie collisional orogen and the Mesozoic Jiangnan intraplate orogen in east-central China. Three regional deformation events are recognized in the Dabie Orogen north of the Yangtze River. The earliest regional deformation (D1) corresponded to a southeastward compression that occurred during the subduction of the South China Plate below the North China Plate. Top-to-the-southeast shearing coeval with Late Permian-Early Triassic blueschist facies metamorphism, was possibly associated with the development of regional gneissosity in the Dabie complexes and flat-ramp-style thrusts within the NeoproterozoicPalaeozoic sedimentary cover, north of the Yangtze River. The main ductile deformation (D2) is also characterized by southeast-verging overturned and recumbent folds, coeval with the early stage of exhumation of the high-pressure rocks. A top-to-the-SW thrusting and WNWstriking open folds belong to a separate, later deformation phase, D3. Previous 40 Ar-39 Ar mica dates ranging between 245 and 205 Ma suggest Late Permian-Early Jurassic ages for the D1 to D3 events. The foreland folds and thrusts related to these deformations in the Dabie Orogen flank the eastern and western 'limbs' of the Dabie Orogen but are absent in the front of it. In contrast to the deformation north of the Yangtze River, the deformation of Neoproterozoic-Palaeozoic sedimentary cover in the Jiangnan Orogen south of the Yangtze River is generally characterized by north-verging folding and top-to-the-north thrusting from Triassic to Jurassic times. Based on the differences of deformation and structural polarity between the south and north areas of the Yangtze River, we propose that the Yangtze foreland fold-and-thrust belt in the direct front of the Dabie Orogen is unrelated to the Dabie Orogen but resulted from the Jiangnan Orogen.

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Section: Geological Settingmentioning

confidence: 69%

Section: Geological Settingmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 99%

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Not all folds and thrusts in the Yangtze foreland thrust belt are related to the Dabie Orogen: Insights from Mesozoic deformation south of the Yangtze River

Zhao

Zhang

et al. 2010

Geological Journal

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“…After inter-continental collision orogeny (Late Triassic to Early Jurassic), Dabashan orocline continue reshaping during Late Jurassic to Early Cretaceous, proved by the sediment sequence and strata unconformity (Dong et al, 2005(Dong et al, , 2008Meng et al, 2005;Shi et al, 2007Shi et al, , 2012Li et al, 2007;Qu et al, 2009;Hu et al, 2012), isotopy dating (Cheng and Yang, 2009;Hu et al, 2009;Liu et al, 2011;Li et al, 2010Li et al, , 2012Li et al, , 2013, and apatite fission-track (Shen et al, 2009;Xu et al, 2010;Li et al, 2010, Shi et al, 2012Hu et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

The geological and geodynamic condition on the formation of the Dabashan thrust nappe structure: Based on FLAC numerical modelling

Zhang¹,

Dong²

2016

Earth sci. res. j.

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The Dabashan thrust nappe structure at the southern margin of the Qinling orogenic belt suffered at least two stages of evolution which are Late Triassic plate subduction collisional orogeny between North China block, Qinling micro-plate and Yangtze block followed by intracontinental orogeny since the Meso-Cenozoic. A prominent topography characteristic within the Dabashan area is a southwestward extrusive arc (Bashan Arc fault) that is one of key factors to understand the geodynamic condition of the Dabashan thrust nappe structure.In this work, two-dimensional plan-view models are constructed to simulate the collisional and intracontinental orogenic movements, and the factors that may control the formation of the Bashan Arc fault are analysed. The modelling results show that the compressive stress produced by the plates collision along both north and south boundaries is the main driving force. The dextral shearing derived from the inconsistent shape on the block margins is the main controller. Rigid tectonic units such as Bikou and Hanan-Micangshan terranes, Foping and Wudang domes, as well as Shennongjia-Huangling anticline also contribute as "anchor" effects. Additionally, the rheology properties of rock material in the Dabashan area affect the shape of the arc.La estructura de la falla de cabalgamiento de las montañas Dabashan en el margen sur del cinturón orogénico de Qinling sufrió por lo menos dos etapas de evolución, la colisión orogénica del Triásico Superior entre el bloque de la China del Norte, la microplaca de Qinling y el bloque Yangtze, y la orogénesis intracontinental desde el Meso-Cenozoico. Una característica topográfica prominente del área de Dabashan es un arco extrusivo (falla Arco de Bashan) hacia el suroeste, que es un factor determinante para entender la condición geodinámica de la falla de cabalgamiento en las montañas Dabashan. En este trabajo se construyeron modelos bidimensionales planos para simular los movimientos de colisión e intracontinental orogénicos y se analizaron los factores que podrían controlar la formación de la falla del Arco de Bashan. Los resultados del modelado muestran que el esfuerzo de compresión producido por las placas de colisión en los límites norte y sur es la principal fuerza impulsora de la falla. La principal controladora es la fuerza de cizallamiento dextral derivada de la forma inconsistente en los margenes del bloque. Las unidades tectónicas rígidas como los terrenos Bikou y HananMicangshan, el domo Foping y Wudang, al igual que el anticlinal Shennongjia-Huangling tienen funciones de ancla. Adicionalmente, las propiedades reológicas del material rocoso en el área Dabashan afectan la forma del arco. Condición geológica y geodinámica para la formación estructural de la falla de cabalgamiento en las montañas Dabashan basada en el modelo numérico del software FLAC B2 Xiaoning Zhang and Yunpeng Dong. ABSTRACT RESUMEN

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“…Combined with previous studies, the Qinling orogenic belt, being part of the central orogenic belt in China, was sutured to the Yangtz block during the middle to late Triassic 2010), and the end period of Indo-China Movement in Qinling is characterized by changing from continental crust thickened to lithosphere mantle adjusting or crust thining (Zhang et al, 2001;Zhang et al, 1995;Zhang et al, 1996Zhang et al, , 1997, Gong et al (2009) proposed that the tectonic event of transition from lithospheric extrusion to extension in Qinling orogenic belt, may generated in range of 224-210Ma. Moreover, Xu et al (2007) zircon U-Pb dating yields ages of 211Ma for magma crystallization, corresponding to the end period of Indo-China Movement, Pb isotopic data suggest an impossible source of the North Qinling basement rocks for rhyolites.…”

Section: Geodynamic Implicationsmentioning

confidence: 68%

Geochemical Characteristics and Tectonic Significance of the Acidic Volcanic Rocks from the Shetang-Boyang Area, Western Qinling Orogenic Belt, China

Ma¹,

Guan²,

Zou³

et al. 2016

ESR

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Acidic volcanic rocks of Shetang-Boyang area are located in the western Qinling orogenic belt, consist of rhyolite and granite porphyry. They are comparable in the chemical composition, enriched in Si, alkali, Al and a little bit of Mg, Ca and Ti. The contents of HFSE (Zr, Hf) and LILE (Rb, Th, U) are high, however, the content of Ba, Sr, Ti, P have obviously depleted and there are obvious negative Eu anomalies (Eu/Eu*=0.06-0.13). These geochemical characteristics are revealed that these volcanic rocks have an A 1 type affinity. Geochemical data combined with regional studies, show that these volcanic rocks were formed in a continental extension setting and the western Qinling orogenic belt in 211Ma has been in the tectonic setting of post-collisional extension.

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Two-stage Triassic exhumation of HP–UHP terranes in the western Dabie orogen of China: Constraints from structural geology

Cited by 110 publications

References 93 publications

Not all folds and thrusts in the Yangtze foreland thrust belt are related to the Dabie Orogen: Insights from Mesozoic deformation south of the Yangtze River

Not all folds and thrusts in the Yangtze foreland thrust belt are related to the Dabie Orogen: Insights from Mesozoic deformation south of the Yangtze River

The geological and geodynamic condition on the formation of the Dabashan thrust nappe structure: Based on FLAC numerical modelling

Geochemical Characteristics and Tectonic Significance of the Acidic Volcanic Rocks from the Shetang-Boyang Area, Western Qinling Orogenic Belt, China

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