The Sino-Korean–Yangtze suture, the Huwan detachment, and the Paleozoic–Tertiary exhumation of (ultra)high-pressure rocks along the Tongbai-Xinxian-Dabie Mountains

Ratschbacher, Lothar; Franz, Leander; Enkelmann, Eva; Jonckheere, Raymond; Pörschke, Axel; Hacker, Bradley R.; Dong, Shuwen; Zhang, Yueqiao

doi:10.1130/2006.2403(03)

Cited by 112 publications

(180 citation statements)

References 83 publications

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“…(2) A muscovite 40 Ar/ 39 Ar age of 261.5±1.6 Ma is obtained for a metapsammite (sample XY24-1; 315952N, 1140502E) from the Nanwan flysch of the Tongbai orogen (Table 1, Figure 2). This age is in agreement with muscovite 40 Ar/ 39 Ar ages (271-261 Ma) obtained from the Foziling Group of the Dabie orogen [33][34][35]. These two Devonian flysch sequences may represent the hangingwall accretionary complex formed during the northerly subduction of the South China Block in the latest Paleozoic [36][37][38].…”

Section: Interpretation Of Diachroneity Across the Direction Of The Osupporting

confidence: 73%

Diachroneity of continental subduction and exhumation: Constraints from the Permian-Triassic HP metamorphic terrane in the Tongbai orogen, central China

Liu

Jahn

2013

Chin. Sci. Bull.

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High-pressure (HP) metamorphic terrane in the Tongbai orogen comprises two HP slices (I and II) and a tectonic mélange zone in the northeast and a blueschist-greenschist zone in the southwest. HP slice I is represented by the northern and southern eclogite zones on the two sides of the Tongbaishan antiform. HP slice II is represented by retrograded eclogite-bearing metamorphic enclaves in Cretaceous gneissic granites in the Tongbai Complex. U-Pb, Lu-Hf, Rb-Sr and 40 Ar/ 39 Ar multichronometric data indicate that the peak metamorphism of HP slice I took place at ~255 Ma, whereas the metamorphic ages of HP slice II are as young as 232-220 Ma. By contrast, the tectonic mélange zone near the suture was metamorphosed at ~256 Ma. Such a diachroneity of different slices across the direction of the orogen in the Hong'an-Dabie-Sulu HP/UHP terrane is ubiquitous, and it can be interpreted by a syn-subduction detachment/exhumation model. Furthermore, the metamorphic age of HP slice I in the Tongbai orogen is older than that of the equivalent HP slice in the Hong'an orogen by ~15 Ma, suggesting that the diachroneity may have also existed along the direction of the orogen. A seesaw-type subduction/exhumation model is proposed to explain this age disparity and the subduction of the South China Block becomimg shallower towards the west. The processes and mechanism of exhumation of ultrahighpressure (UHP) metamorphic rocks to the Earth's surface from mantle depths exceeding ~100 km remain as one of the most difficult problems in earth science. It appears that a simple mechanism involving buoyancy and erosion is unable to explain the rapid exhumation required for the preservation of coesite. Much attention should be paid to the deepseated tectonic processes of continental slab. Based on the nature of structural contacts and existence of metamorphic gaps between different HP/UHP metamorphic units in the Dora Maira Massif of the western Alps, Chopin [1] andSchreyer [2] inferred that the end of the downgoing slab might have successively broken to several slices during its subduction along very low geothermal gradients (~7C/km). The earlier subducted slices could be uplifted as the overlying hanging-walls during the subduction of the later underlying slices. Liu and Hu [3] have formerly noticed the similarity of HP/UHP terrane from the Dabie Mountains and the Dora Maira Massif. Lately Liu et al. [4,5] distinguished UHP, HP and low-temperature (LT) HP slices and a tectonic mélange zone with the time difference of exhumation of ~30 Ma in the Hong'an orogen on the basis of thermobaric structure and geochronological data, and proposed a diachronous subduction/exhumation model for the formation of

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Section: Interpretation Of Diachroneity Across the Direction Of The Osupporting

confidence: 73%

Diachroneity of continental subduction and exhumation: Constraints from the Permian-Triassic HP metamorphic terrane in the Tongbai orogen, central China

Liu

Jahn

2013

Chin. Sci. Bull.

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“…The Guishan and the Nanwan slices represent an accretionary wedge developed during the northward subduction of the Yangtze Plate beneath the North China Plate along the Xiaojiamiao mélange unit during the Late Palaeozoic (Zhou et al, 2008). The protoliths of the Tongbai high-grade Complex and the HP rocks were subducted to different depths and experienced various grades of metamorphism, even up to the eclogite-facies in the Late Permian (Hacker et al, 1995a;Hacker and Wang, 1995Ratschbacher et al, 2003Ratschbacher et al, , 2006Ernst et al, 2007;Liu et al, 2008a;Zheng et al, 2005Zheng et al, , 2008Zhang et al, 2009) (Figure 12a). Thus, the D 1 -D 5 deformation events that occurred after the peak HP metamorphism, record the exhumation process of the Tongbai HP rocks.…”

Section: Tectonic Implicationsmentioning

confidence: 98%

“…The Haohanpo ductile shear zone (f 5 in Figure 1) in the south separates the Erlangping tectonic unit from the Qinling Complex unit. (3) The Qinling Complex unit, consisting of plagiogneiss, amphibolite, granitic gneiss and marble, metamorphosed at amphibolite facies and carrying granulite facies lenses (Zhai et al, 1997(Zhai et al, , 1998, possibly represent a Palaeozoic magmatic arc sequence (Okay et al, 1993;Kröner et al, 1993;Zhang et al, 1994Zhang et al, , 1996aRatschbacher et al, 2003Ratschbacher et al, , 2006, and is separated by the Songpa ductile shear zone (f 6 in Figure 1) from the Guishan slice to the south. (4) The Guishan slice and the Nanwan slice.…”

Section: Regional Geologymentioning

confidence: 98%

“…Several models have been proposed for the tectonic setting of this unit and its equivalent, the Liuling unit in the Qinling Orogen and the Foziling unit in the Dabie Orogen (e.g. Okay et al, 1993;Kröner et al, 1993;Zhou et al, 2001;Ratschbacher et al, 2003Ratschbacher et al, , 2006Xu et al, 2005aXu et al, , 2005bLi et al, 2005;Zheng et al, 2005). Based on new structural data (see below) and our new field observations, we consider that the rocks of this unit were scraped off from the north Qinling arc and its forearc flysch during the subduction (Meng et al, 1996;Zhang et al, 2001), carried into the subduction zones and accreted on to the overriding plate without experiencing the Triassic ultrahigh-pressure metamorphism.…”

Section: Regional Geologymentioning

confidence: 99%

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Structural anatomy of the exhumation of high‐pressure rocks: constraints from the Tongbai Collisional Orogen and surrounding units

Liu¹,

Li²,

Suo³

et al. 2011

Geological Journal

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The Tongbai Collisional Orogen and associated units, located between the Qinling and Dabie orogens, can be divided into nine lithotectonic units. From north to south, these are the southern tectonic unit of the North China Plate-the Maoji Group, the Erlangping tectonic unit, the Qinling Complex unit, the Guishan and Nanwan slice, the Xiaojiamiao mélange unit, the northern high-pressure (HP) unit, the Tongbai highgrade Complex, the southern HP unit and the Suizhou tectonic belt. Based on structural analysis and available geochronological data, five principal episodes of deformation (D 1 -D 5 ) are distinguished in this area following the Mesozoic HP metamorphism. The first two episodes of deformation developed in various tectonic units to the south of the Xiaojiamiao mélange unit, and the subsequent episodes of deformation developed in all the units of this area. The D 1 deformation is correlated to ca. 255-238 Ma generating regional penetrative foliation and WNW-trending stretching lineation, and leading to the initial stage of eastward oblique extrusion of the HP rocks. The D 2 event is characterized by top-to-the-SSW thrusting which contributed to the further vertical uplift of the HP rocks sometime around 230-215 Ma. The D 3 event is defined by WNW-trending open folds, and must have taken place earlier than Lower Jurassic. The D 4 event is characterized by ductile strike-slip shearing, and during this episode the Tongbai high-grade Complex was extruded to the east at ca. 131-119 Ma. The D 5 event probably took place at ca. 100-80 Ma, and is marked by the NW and NE trending brittle faults which overprint all of the above mentioned structures. The exhumation of the Tongbai HP rocks illustrates the process of gradual extrusion and uplift, controlled by several episodes of deformation.

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“…1a). It is at a key tectonic position, been considered as a composite orogenic belt, formed by the collision of the South China and North China blocks (Mattauer et al, 1985;Sengor, 1985;Zhang, 1985;Ren et al, 1986;Hsu et al, 1987;Zhang et al, 1987Zhang et al, , 1989Enkin et al, 1992;Kröner et al, 1993;Li et al, 1993;Okay and Sengor, 1993;Ames et al, 1996;Zhang et al, 1996a;Hacker et al, 1998;Meng and Zhang, 1999;Faure et al, 2001;Zhang et al, 2001;Ratschbacher et al, 2003Ratschbacher et al, , 2006Dong et al, 2011aDong et al, ,b,c, 2012aBader et al, 2013a,b;Dong et al, 2013;Li et al, 2015;Dong et al, 2016). Qinling orogenic belt has preserved a lot of kinematic evolution records of long-term multiple stages subduction and collision between the South China and North China blocks, as well as tectonic records of overthrust thrusting, strike-slip regulation, extensional collapse, been a good region for studying orogenic tectonic process.…”

Section: Introductionmentioning

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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The Sino-Korean–Yangtze suture, the Huwan detachment, and the Paleozoic–Tertiary exhumation of (ultra)high-pressure rocks along the Tongbai-Xinxian-Dabie Mountains

Cited by 112 publications

References 83 publications

Diachroneity of continental subduction and exhumation: Constraints from the Permian-Triassic HP metamorphic terrane in the Tongbai orogen, central China

Diachroneity of continental subduction and exhumation: Constraints from the Permian-Triassic HP metamorphic terrane in the Tongbai orogen, central China

Structural anatomy of the exhumation of high‐pressure rocks: constraints from the Tongbai Collisional Orogen and surrounding units

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

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