Metamorphic patterns and SHRIMP zircon ages of medium-to-high grade rocks from the Tongbai orogen, central China: implications for multiple accretion/collision processes prior to terminal continental collision

Liu, X. C.; Jahn, Bor‐ming; Hu, Jianmin; Li, S. Z.; Liu, Xueyan; Song, Biao

doi:10.1111/j.1525-1314.2011.00952.x

Cited by 132 publications

(137 citation statements)

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“…Since zircon U-Pb age data obtained for the equivalent unit in the Hong'an orogen are concentrated in the Neoproterozoic, it is generally accepted that the tectonic mélange zone represents a crustal segment of the South China Block [5, [16][17][18]. Huang et al [19] obtained a muscovite 40 Ar/ 39 Ar age of 256±1 Ma in the ductile shear zone and interpreted it as the time of deformation. This tectonic mélange zone appears to be comparable with the Luzhenguan complex in the Dabie orogen in terms of similar rock associations, metamorphism and deformation.…”

Section: Diachroneity Of the Tongbai Hp Metamorphic Terranementioning

confidence: 99%

“…The metamorphic age of the blueschistgreenschist zone has not yet obtained in the Tongbai orogen. However, a phengite 40 Ar/ 39 Ar age of 231±1 Ma was reported from its equivalent part in the Hong'an orogen [25].…”

Section: Diachroneity Of the Tongbai Hp Metamorphic Terranementioning

confidence: 99%

“…This suggests that these Carboniferous oceanic-type eclogites may have been reworked by continental subduction during the Late Permian. (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].…”

Section: Interpretation Of Diachroneity Across the Direction Of The Omentioning

confidence: 99%

“…Since inclusions of garnet, omphacite, amphibole, paragonite, epidote, quartz and rutile were found in metamorphic zircon domains, and omphacite occur as inclusions in garnet, the age of ~255 Ma was regarded as the timing of eclogite facies metamorphism. On the other hand, muscovite 40 Ar/ 39 Ar dating for 3 muscovite-albite gneisses and 1 quartzite surrounding eclogites yielded ages of 238±2 Ma, 238±2 Ma, 234±2 Ma and 217±1 Ma, respectively [13], which reflects the time of muscovite cooling through its closure temperature of ~350°C.…”

Section: Diachroneity Of the Tongbai Hp Metamorphic Terranementioning

confidence: 99%

“…The coarse-grained gneissic granites dominating the Tongbai Complex were dated at ~140 Ma. On the other hand, 40 Ar/ 39 Ar thermochronology on hornblende, muscovite and biotite from diverse gneisses and amphibolites yielded two age groups at 135-119 Ma and 99-92 Ma [21][22][23], implying that the Tongbai Complex may have involved two episodes of heating during the Cretaceous extension.…”

Section: Diachroneity Of the Tongbai Hp Metamorphic Terranementioning

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: Diachroneity Of the Tongbai Hp Metamorphic Terranementioning

confidence: 99%

Section: Diachroneity Of the Tongbai Hp Metamorphic Terranementioning

confidence: 99%

Section: Interpretation Of Diachroneity Across the Direction Of The Omentioning

confidence: 99%

Section: Diachroneity Of the Tongbai Hp Metamorphic Terranementioning

confidence: 99%

Section: Diachroneity Of the Tongbai Hp Metamorphic Terranementioning

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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Structural analysis of ductile shear zones in the North Qinling Orogen and its implications for the evolution of the Proto‐Tethys Ocean

Zhao

et al. 2017

Geological Journal

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The ductile shear zones in the North Qinling Orogen, such as the Luonan‐Luanchuan, Guanpo‐Qiaoduan, Zhuyangguan‐Xiaguan, and Shangdan shear zones, play an important role in the preclosure and postclosure evolution of the Proto‐Tethys Ocean. On the basis of detailed macrostructural/microstructural analysis and quartz C‐axis electron backscattered diffraction fabric analysis, the sense and formation environment of the 4 shear zones have been obtained. The Luonan‐Luanchuan and Guanpo‐Qiaoduan shear zones mainly present as dextral and sinistral shearing under low temperature, respectively. The Zhuyangguan‐Xiaguan shear zone mainly presents as dextral shearing under medium temperature. The Shangdan shear zone underwent an early dextral shearing under medium temperature and a late sinistral shearing under low temperature. The Qinling Group and the Taibai region were intensively affected by the late sinistral shearing of the Shangdan shear zone. According to published metamorphic ages, the 4 shear zones should have been formed during the collision between the North China Block and the South China Block. Due to the opening of the Mianlue and the Paleo‐Tethys oceans since ~380 Ma, the North China Block and the South China Block departed from northern Gondwanaland and drifted northward along transform faults, which led to the arrangement between the North China Block and the South China Block that transited from an east–west direction to a north–south direction. Since ~320 Ma, the scissors‐type closure between the North China Block and the South Qinling Terrane led to the westward extrusion of the North Qinling Orogen, and the dextral shearing of the Luonan‐Luanchuan and the Zhuyangguan‐Xiaguan shear zones and the sinistral shearing of the Guanpo‐Qiaoduan and the Shangdan shear zones.

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Geochronology and geochemistry of Beilou granitic pluton: Identification of early Palaeozoic arc magmatic rock in the Dabie Orogen, central China

et al. 2022

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The Dabie Orogen constitutes the eastern part of the Qinling‐Tongbai‐Hong'an‐Dabie orogenic belt, however, whether it has involved into the early Palaeozoic subduction–related event as well‐recorded in the western part is still in debate. This study provides new petrological, geochronological and geochemical data for the Beilou and Mafan plutons in the Dabie‐Hong'an orogens. The Beilou pluton is dominated by granite, some of which have been strongly deformed to form mylonites. The Beilou pluton was emplaced at ca. 490 and ca. 450 Ma, whereas the Mafan pluton was emplaced at 450–430 Ma. The whole‐rock major‐ and trace‐element analyses results indicate that both plutons are depleted in high‐field‐strength elements and heavy rare earth elements. The Beilou pluton also has positive whole‐rock εNd(t) values and generally positive zircon εHf(t) values, whereas all but one of the Mafan pluton samples yield positive whole‐rock εNd(t) and consistently positive zircon εHf(t) values. All of the samples have low (87Sr/86Sr)i ratios. These data indicate that these plutons are formed from magmas generated by the partial melting of metasomatized mantle wedge material with minor additions of crustal materials, representing arc magmatic rocks associated with subduction. Detailed detrital zircon dating of flysch sequences of the Foziling Group within the Dabie Orogen indicates that the early Palaeozoic magmatic rocks had once been distributed in the whole Orogen, although only the Beilou pluton now is exposed in the western Dabie Orogen.

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Metamorphic patterns and SHRIMP zircon ages of medium-to-high grade rocks from the Tongbai orogen, central China: implications for multiple accretion/collision processes prior to terminal continental collision

Cited by 132 publications

References 67 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 analysis of ductile shear zones in the North Qinling Orogen and its implications for the evolution of the Proto‐Tethys Ocean

Geochronology and geochemistry of Beilou granitic pluton: Identification of early Palaeozoic arc magmatic rock in the Dabie Orogen, central China

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