Age and nature of eclogites in the Huwan shear zone, and the multi-stage evolution of the Qinling-Dabie-Sulu orogen, central China

Wu, Yuan–Bao; Hanchar, John M.; Gao, Shan; Sylvester, Paul J.; Tubrett, Michael; Qiu, Hua‐Ning; Wijbrans, J. R.; Brouwer, Fraukje M.; Yang, Sai-Hong; Yang, Qi-Jun; Liu, Yongsheng; Yuan, Huan

doi:10.1016/j.epsl.2008.10.031

Cited by 149 publications

(124 citation statements)

References 51 publications

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“…The conclusion is supported by the following two facts. (1) The garnet-whole rock Lu-Hf and Sm-Nd isochron ages of the oceanic-type eclogites from Xiongdian and adjacent area in the Hong'an orogen are concentrated to 271-252 Ma [26][27][28][29], which are later than the metamorphic zircon U-Pb ages of ~315 Ma obtained for the same eclogites [27,[30][31][32]. This suggests that these Carboniferous oceanic-type eclogites may have been reworked by continental subduction during the Late Permian.…”

Section: Interpretation Of Diachroneity Across the Direction Of The Omentioning

confidence: 82%

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: 82%

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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“…Their results show that the protolith ages of the eclogites from Sujiahe and Hujiawan are about 406 ± 5 Ma-420 ± 7 Ma ( Figure 2), indicating their protoliths intruded in the late Silurian or early Devonian [21] . Cheng et al [67] reported similar LA-ICPMS zircon U-Pb ages for eclogite from the Xiongdian outcrop.…”

Section: Age and Nature Of The Protoliths Of Eclogites In The Westernmentioning

confidence: 95%

“…Wu et al [21] have detailedly analyzed zircon U-Pb ages and Lu-Hf isotope compositons by LA-(MC)-ICPMS for eclogites from Sujiahe and Hujiawan in the Huwan HP zone. Their results show that the protolith ages of the eclogites from Sujiahe and Hujiawan are about 406 ± 5 Ma-420 ± 7 Ma ( Figure 2), indicating their protoliths intruded in the late Silurian or early Devonian [21] .…”

Section: Age and Nature Of The Protoliths Of Eclogites In The Westernmentioning

confidence: 99%

“…Coesite has also been identified in zircon from regional granitic gneiss, indicating that they have experienced the same UHP metamorphism. In recent years, integrated studies of tectonic, petrology, isotope geochronology, and geochemistry reveal that the Qinling-Dabie-Sulu orogen has experienced a multistage amalgamation process, and is a typical multiple collision orogen [11][12][13]17,21,34,35,53,57,[62][63][64][65][66][67] .…”

Section: Geological Settingsmentioning

confidence: 99%

“…It has been recognized recently that it may be a complex process in the formation and evolution of a collision orogen, which may include multistage compression and extension. Compression mainly results in tectonic burial and HP-UHP metamorphism, while extension mainly induces exhumation of HP-UHP rocks and rifting and oceanic formation [2,[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] . It is, however, not easy to constrain the nature and timing of different stages of the multiple shortening-extension cycles of a collision orogen, because most metamorphic rocks have experienced complex metamorphism.…”

mentioning

confidence: 99%

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Multistage evolution of continental collision orogen: A case study for western Dabie orogen

2009

Sci. Bull.

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Late Paleozoic to Early Mesozoic provenance record of Paleo‐Pacific subduction beneath South China

Cawood

et al. 2015

Tectonics

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Northeast trending Yong'an Basin, southeast South China Craton, preserves a Permian-Jurassic, marine to continental, siliciclastic-dominated, retroarc foreland basin succession. Modal and detrital zircon data, along with published paleocurrent data, sedimentary facies, and euhedral to subhedral detrital zircon shapes, indicate derivation from multicomponent, nearby sources with input from both the interior of the craton to the northwest and from an inferred arc accretionary complex to the southeast. The detrital zircon U-Pb age spectra range in age from Archean to early Mesozoic, with major age groups at 2000-1700 Ma, 1200-900 Ma, 400-340 Ma, and 300-240 Ma. In addition, Early Jurassic strata include zircon detritus with ages of 200-170 Ma. Regional geological relations suggest that Precambrian and Early Paleozoic detritus was derived from the inland Wuyi Mountain region and Yunkai Massif of the South China Craton. Sources for Middle Paleozoic to early Mesozoic detrital zircons include input from beyond the currently exposed China mainland. Paleogeographic reconstruction in East Asia suggests derivation from an active convergent plate margin along the southeastern rim of the craton that incorporated part of Southwest Japan and is related to the subduction of the Paleo-Pacific Ocean. Integration of the geologic and provenance records of the Yong'an Basin with the time equivalent Yongjiang and Shiwandashan basins that lie to the southwest and south, respectively, provides an integrated record of the subduction of the Paleo-Pacific Ocean along the southeast margin of the South China Craton and termination of subduction of the Paleo-Tethys beneath its southwest margin in Permo-Triassic.

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Age and nature of eclogites in the Huwan shear zone, and the multi-stage evolution of the Qinling-Dabie-Sulu orogen, central China

Cited by 149 publications

References 51 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

Multistage evolution of continental collision orogen: A case study for western Dabie orogen

Late Paleozoic to Early Mesozoic provenance record of Paleo‐Pacific subduction beneath South China

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