Mesozoic Unroofing History of the Dabie Orogen, Eastern China: Evidence from Detrital Zircon Geochronology of Sediments in the Hefei Basin

Wang, Yongsheng; Bai, Qiao; Tian, Ziqiang; Du, Hui

doi:10.1086/714176

Cited by 8 publications

(14 citation statements)

References 82 publications

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“…An extensive marine‐brackish fauna is found in the Huangmaqing Formation (Zhong et al., 2013). The stratigraphic age of the Huangmaqing Formation has been suggested to be Middle Triassic (Ladinian stage, 242–247 Ma) based on its fossil record (J. Li & Ding, 1982; Zhong et al., 2013) and Middle‐Upper Triassic stage by geochronological studies (Y. Wang et al., 2021; this study), although more accurate estimates of the depositional age are still required. The Lalijian Formation is a series of lacustrine facies coal‐bearing deposits, containing Late Triassic insects and terrestrial plant fossils (Guo, 1984; Q. Huang, 1984).…”

Section: Geologic Backgroundmentioning

confidence: 89%

Sedimentological Evidence for Pre‐Early Permian Continental Subduction in the Dabie Orogen, Central‐East China

Deng,

Hu,

Chew

et al. 2024

Tectonics

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How to constrain the onset of continental subduction and prograde metamorphism in an orogen remains a fundamental question. The widespread Triassic ultrahigh‐pressure (UHP) metamorphic rocks in the Dabie orogen in central‐east China are generally attributed to continental subduction. The earliest Triassic peripheral basins (the Huangshi, Yueshan and Nanjing basins) around the Dabie orogen represent an ideal archive to reconstruct the early evolution of the orogen. Here we present a multidisciplinary provenance study on these Triassic strata, including framework petrography and heavy mineral analyses combined with U‐Pb age and trace‐element analyses of detrital zircon, rutile and apatite. The abundant metapelitic lithics and muscovite grains, a heavy mineral population dominated by metamorphic apatite, and a significant Permian (270–290 Ma) age peak from U‐Pb age spectra of detrital zircon, rutile and apatite imply an Early Permian medium‐high grade metamorphic source in the uppermost structural levels of the Dabie orogen. Our provenance data indicate that the onset of northward continental subduction of the South China Block commenced no later than the Early Permian (c. 290 Ma). This event is clearly earlier and distinct from the more widespread Triassic UHP metamorphism of the Dabie orogen, suggesting that continental subduction and mountain‐basin interaction were protracted processes (>55 Myr, c. 290–235 Ma). When combined with other geological evidence, our results show that the prolonged continental subduction is not always preceded by subduction of oceanic crust.

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Section: Geologic Backgroundmentioning

confidence: 89%

Sedimentological Evidence for Pre‐Early Permian Continental Subduction in the Dabie Orogen, Central‐East China

Deng,

Hu,

Chew

et al. 2024

Tectonics

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“…40 Ar/ 39 Ar dating of mica separated from this shear zone yields a wide range of plateau ages (162–139 Ma) for muscovite and biotite (130–100 Ma) (Wang, 2006; Zhu et al., 2005, 2010). Unfoliated dikes that crosscut the mylonitic foliation of the shear zone were dated as 127–126 Ma by zircon U–Pb geochronology (Y. Wang et al., 2019), which provides an upper bound of the timing of shear deformation. It is likely that the muscovite 40 Ar/ 39 Ar ages of 162–139 Ma with a closure temperature in the range of 350°C–400°C (Harrison et al., 2009) best approximates the actually timing of shear deformation.…”

Section: Discussionmentioning

confidence: 99%

“…Zircon U–Pb geochronology has also been used to investigate the timing of shear deformation (Han & Niu, 2016; Han et al., 2015; Z. Li et al., 2020; Lu et al., 2023; W. Wang et al., 2015, 2016; Y. Wang et al., 2019; H. Yin et al., 2020; D. Zhang et al., 2018; Zhu et al., 2018). Due to the high closure temperature of U–Pb isotopic system in zircon and relatively low tendency to recrystallization under amphibolite‐ to greenschist‐facies metamorphic conditions of zircon (Corfu et al., 2003; Hoskin & Schaltegger, 2003; Lee et al., 1997), these studies only provide information on the upper bound of the deformation timing obtained by zircon U–Pb ages of the post‐kinematic granitic veins but fail to directly date the timing of mylonitic rocks formed.…”

Section: Introductionmentioning

confidence: 99%

Dating Strike‐Slip Ductile Shear Through Combined Zircon‐, Titanite‐ and Apatite U–Pb Geochronology Along the Southern Tan‐Lu Fault Zone, East China

et al. 2023

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“…The metamorphic rocks of the Dabie Orogen consist of a large amount of Neoproterozoic (800-700 Ma) granitic gneiss and quartzite and an abundant Caledonian terrane of 500-400 Ma gneiss (Liu, 2018;Liu et al, 2008;Xiang et al, 2012;Zhao et al, 2014). Archean-Paleoproterozoic magmatism has also been reported, including the 2.77 Ga granulites, 2.65-2.41 Ga granites, 2.0-1.8 Ga mafic dikes, eclogites and jadeite quartzites (Qiu et al, 2020;Qiu, Tong, et al, 2021;Qiu, Yang, et al, 2021;Tian et al, 2022;Wang, Guo, et al, 2021;Wang, Bai, et al, 2021;Zhao, Zhu, Wu, et al, 2021). Tong et al (2022) reported a group of 254-156 Ma magmatic zircon ages in the Kangjiawan mélange in the western part of the Dabie Orogen.…”

Section: Geological Settingmentioning

confidence: 99%

Geochemistry and geochronology of Upper Triassic sedimentary rocks from the south of the Dabie Orogen: Implications for the paleoenvironment, provenance and tectonic setting

Zhao,

Hu,

Zhan

et al. 2023

Geological Journal

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The formation and evolution of the foreland basin in the south of the Dabie Orogen are both closely related to the uplift of the orogenic belt. However, the Late Triassic paleoenvironment and the provenance of the sediments in the foreland basin remain controversial. Nine samples from the Upper Triassic Puqi Group of the foreland basin were analysed for whole‐rock major and trace elements and three sandstone samples were selected for zircon dating by U–Pb laser ablation inductively coupled plasma mass spectrometry. The concentrations of some major (e.g., CaO and Na2O) and trace (e.g., Rb, Sr and Ba) elements varied over a large range and showed different degrees of depletion. A series of major and trace element indicators, as well as the patterns of the rare earth elements, suggested derivation from felsic igneous rocks. The Late Triassic experienced fluctuations between cold warm climates, as indicated by the chemical weathering index ranging from 51.33 to 88.65. The CaO/(FeO + CaO), Rb/Sr and Ba/K ratios indicated that the paleosalinity changed from high to low. The Fe2O3/FeO, U/Th, V/Cr and Ni/Co ratios indicated an oxidizing sedimentary environment. The cathodoluminescence images, Th/U ratios and rare earth elements patterns of the detrital zircons all indicated a magmatic origin. Three samples showed significant peak ages of 224, 440, 748, 1870 and 2492 Ma, corresponding to the development of the Dabie Orogen. Our comprehensive analyses suggest that the Upper Triassic Puqi Group was formed by deposition during continental–continental collision. The Dabie Orogen was exhumed in the Late Triassic and supplied detrital sediments to the foreland basin.

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Mesozoic Unroofing History of the Dabie Orogen, Eastern China: Evidence from Detrital Zircon Geochronology of Sediments in the Hefei Basin

Cited by 8 publications

References 82 publications

Sedimentological Evidence for Pre‐Early Permian Continental Subduction in the Dabie Orogen, Central‐East China

Sedimentological Evidence for Pre‐Early Permian Continental Subduction in the Dabie Orogen, Central‐East China

Dating Strike‐Slip Ductile Shear Through Combined Zircon‐, Titanite‐ and Apatite U–Pb Geochronology Along the Southern Tan‐Lu Fault Zone, East China

Geochemistry and geochronology of Upper Triassic sedimentary rocks from the south of the Dabie Orogen: Implications for the paleoenvironment, provenance and tectonic setting

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