Detachment within subducted continental crust and multi-slice successive exhumation of ultrahigh-pressure metamorphic rocks: Evidence from the Dabie-Sulu orogenic belt

Liu, Yi-Can; Li, Qiuli

doi:10.1007/s11434-008-0387-1

Cited by 73 publications

(39 citation statements)

References 86 publications

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“…This mixed slice took its place at a shallow level during the subduction of HP slice I. As mentioned previously, syn-subduction detachment and exhumation of HP/UHP slices have been widely recognized in the Hong'an-Dabie-Sulu orogen [8,12]. However, it seems that the detachment of continental slab at middle to lower crustal levels is especially prominent in the Tongbai orogen.…”

Section: Interpretation Of Diachroneity Across the Direction Of The Omentioning

confidence: 68%

“…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 different HP/UHP slices. Similarly, three HP/UHP slices with different peak metamorphic ages were also recognized in the Dabie-Sulu orogen in the light of precise isotopic dating, and multi-slice or differential subduction/exhumation model was established accordingly [6][7][8][9][10][11][12]. It seems that the idea of differential subduction and exhumation of continental slab has been generally accepted for the formation and evolution of the UHP terranes in China [12].…”

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confidence: 99%

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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 Omentioning

confidence: 68%

mentioning

confidence: 99%

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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“…In particular, a two-stage syn-collisional (Triassic) exhumation model of the UHP slabs is suggested based on evidence from petrology, geochemistry, geochronology and isotope geochemistry Li et al, 2001;Webb et al, 1999;Zheng, 2008;Zheng et al, 2003Zheng et al, , 2005Zheng et al, , 2007Zheng et al, , 2009Zhou et al, 2008aZhou et al, , 2008bZhou et al, , 2008cLiu and Li, 2008;Wu et al, 2008). The first stage is characterized by rapid exhumation that occurred in the Middle Triassic, from diamond-eclogite facies of >120 km depth at 238 Ma, to coesite-eclogite facies of about 80 km at 225 Ma.…”

Section: Discussionmentioning

confidence: 99%

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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“…Petrological studies have demonstrated that the UHP metamorphic conditions in the Dabie orogen are 2.8-4.1 GPa and 670-800°C (Okay, 1993;Cong et al, 1995;Carswell et al, 1997Carswell et al, , 2000Li et al, 2004), resulting in the formation of UHP index minerals such as coesite (Okay et al, 1989;Wang et al, 1989Wang et al, , 1992 and microdiamond (Xu et al, 1992(Xu et al, , 2003(Xu et al, , 2005. Because of the crustal detachment during subduction and exhumation of the continental crust, different grades of metamorphic rocks occur in the Dabie orogen (Zheng et al, 2005a;Liu and Li, 2008;Zheng, 2008). Thus, this orogen is subdivided, from north to south, into five lithotectonic units as follows: (1) the Beihuaiyang low-T/low-P greenschist-facies zone, (2) the North Dabie high-T/UHP granulite-facies zone with migmatization, (3) the Central Dabie mid-T/UHP eclogite-facies zone, (4) the South Dabie low-T/UHP eclogite-facies zone, (5) the Susong low-T/HP blueschist-facies zone.…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

Zr-in-rutile thermometry of eclogite in the Dabie orogen: Constraints on rutile growth during continental subduction-zone metamorphism

Zheng

Gao

Chen

et al. 2011

Journal of Asian Earth Sciences

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Detachment within subducted continental crust and multi-slice successive exhumation of ultrahigh-pressure metamorphic rocks: Evidence from the Dabie-Sulu orogenic belt

Cited by 73 publications

References 86 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

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

Zr-in-rutile thermometry of eclogite in the Dabie orogen: Constraints on rutile growth during continental subduction-zone metamorphism

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