Intra-continental Dabashan orocline, southwestern Qinling, Central China

Shi, Wei; Zhang, Yueqiao; Dong, Shuwen; Hu, Jianmin; Wiesinger, Maria; Ratschbacher, Lothar; Jonckheere, Raymond; Li, Jianhua; Tian, Mi; Hong, Chen; Wu, Guoli; Ma, Licheng; Li, Hailong

doi:10.1016/j.jseaes.2011.10.005

Cited by 109 publications

(81 citation statements)

References 34 publications

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“…1b, Zhang et al, 2001;Dong et al, 2006Dong et al, , 2008Dong et al, , 2013Shi et al, 2012Shi et al, , 2013. The Dabashan thrust nappe structure can be divided into Southern and Northern Dabashan tectonic units which are evidently different (Fig.…”

Section: Tectonic Settingmentioning

confidence: 99%

“…The Dabashan thrust nappe structure can be divided into Southern and Northern Dabashan tectonic units which are evidently different (Fig. 1c, Zhang et al, 2010;Shi et al, 2012Shi et al, , 2013, the Northern Dabashan tectonic unit shows NW-SE direction while Southern Dabashan tectonic unit spreads as arc shape and displays features of two stage overprint (Dong et al, 2008). From view of lithology, the Southern and Northern Dabashan tectonic units are also distinct (e.g.…”

Section: Tectonic Settingmentioning

confidence: 99%

“…1b,c, Zhang et al, 2001;Dong et al, 2006Dong et al, , 2008Dong et al, , 2011Shi et al, 2012Shi et al, , 2013. The unit displayed as a typical double arc-shape structure in the west flank of the Huangling-Shennongjia massif (Yue et al, 1996;Huang 2000;Wu et al, 2009;Shi et al, 2012Shi et al, , 2013. The Southern Dabashan is characterized by developed fold-thrust structures, can be further divided into northern foreland fold-thrust belt and southern overthrusting extended belt (Fig.…”

Section: Tectonic Settingmentioning

confidence: 99%

“…It's geological and geodynamic evolution has been one of research hotspots over the past decades, lots of study results have been reported in this area (e.g. Cai et al, 1988;He et al, 1997He et al, , 1999Zhang et al, 2001Zhang et al, , 2010Wang et al, 2003;Dong et al, 2005Dong et al, , 2006Dong et al, , 2008Dong et al, , 2011Liu et al, 2006;Wang et al, 2006;Shi et al, 2007Shi et al, , 2012Shi et al, , 2013Tan et al, 2007;Hu et al, 2009Hu et al, , 2012.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Tectonic Settingmentioning

confidence: 99%

Section: Tectonic Settingmentioning

confidence: 99%

Section: Tectonic Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Recently, mylonites from the North Daba Shan belt yielded the Late Triassic-Early Jurassic 40 Ar/ 39 Ar plateau age of 222-189 Ma . These ages were interpreted as indicative of the first deformation phase that should be geodynamically related to the Qinling orogenesis (e.g., Shi et al, 2012;Xu et al, 2010). Compared with that in the Longmen Shan belt, the Triassic orogenesis on the north of Sichuan basin was less intensive, resulting in an unconspicuous wedge-shaped geometry in the N-S cross section ( Fig.…”

Section: Tectonic-paleogeographic Evolutionmentioning

confidence: 99%

Provenance and tectonic-paleogeographic evolution: Constraints from detrital zircon U–Pb ages of Late Triassic-Early Jurassic deposits in the northern Sichuan basin, central China

Shao

Cheng

Song

2016

Journal of Asian Earth Sciences

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Mesozoic tectonic evolution of the Daba Shan Thrust Belt in the southern Qinling orogen, central China: Constraints from surface geology and reflection seismology

Dong

Yin

et al. 2015

Tectonics

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The Daba Shan Thrust Belt is located along the southern margin of the Qinling orogen that separates the north China block in the north from the south China block in the south. Despite decades of research, the total magnitude of shortening accommodated by continent-continent convergence across the Qinling orogen after Triassic ocean closure between north and south China remains poorly constrained. The lack of knowledge on the shortening magnitude in turn limits our ability to test a wide array of tectonic models for the development of the Qinling orogen and thus the convergence history between north and south China. In order to address this issue, we construct a balanced cross section and develop a new kinematic model for the evolution of the Daba Shan Thrust Belt. This work was accomplished by integrating (1) surface geologic mapping, (2) detailed kinematic analysis of key structures, (3) existing geochronologic and thermochronological data, and (4) a recently obtained lithospheric-scale seismic reflection profile. Restoration of the cross section indicates that the minimum shortening strain increases northward from~10% in the foreland to >45% in the thrust belt interior. The estimated amount of upper crustal shortening across the Daba Shan Thrust Belt is >130 km, which is sufficient to allow the inferred mafic lower crust of the subducted south China lithosphere to have experienced eclogite phase transition. Thus, our work supports that the development of the Daba Shan Thrust Belt may have been driven by slab pull of the subducted mafic lower crust at the leading edge of the down-plunging south China continental lithosphere.

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Intra-continental Dabashan orocline, southwestern Qinling, Central China

Cited by 109 publications

References 34 publications

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

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

Provenance and tectonic-paleogeographic evolution: Constraints from detrital zircon U–Pb ages of Late Triassic-Early Jurassic deposits in the northern Sichuan basin, central China

Mesozoic tectonic evolution of the Daba Shan Thrust Belt in the southern Qinling orogen, central China: Constraints from surface geology and reflection seismology

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