Cretaceous exhumation of the Triassic intracontinental Xuefengshan Belt: Delayed unroofing of an orogenic plateau across the South China Block?

Chu, Yang; Lin, Wei; Faure, Michel; Allen, Mark B.; Feng, Zhentian

doi:10.1016/j.tecto.2020.228592

Cited by 33 publications

(23 citation statements)

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“…There is a potential resemblance to the modern arc of the central Andes (Allmendinger et al, 1997), where crustal thickening and plateau growth developed over the Cenozoic (Scott et al, 2018), and melting of older basement took place during subduction of the Nazca plate (Miller and Harris, 1989). This model is also consistent with the idea that much of eastern China was a high orogenic plateau during the Mesozoic, before widespread Early Cretaceous extension and core complex development (Meng, 2003;Chu et al, 2020). Data availability.…”

Section: Tectonic Implicationssupporting

confidence: 57%

Whole-rock and zircon evidence for evolution of the Late Jurassic high-Sr ∕ Y Zhoujiapuzi granite, Liaodong Peninsula, North China Craton

Zeng

Allen²,

Mao³

et al. 2022

Solid Earth

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Abstract. Middle–Late Jurassic high-Sr/Y granitic intrusions are extensively exposed in the Liaodong Peninsula in the eastern part of the North China Craton (NCC). However, the genesis of the high Sr/Y signature in these intrusions has not been studied in detail. In this study, we report results of zircon U–Pb dating, Hf isotopic analysis, and zircon and whole-rock geochemical data for the Late Jurassic Zhoujiapuzi granite in the middle part of the Liaodong Peninsula. The Zhoujiapuzi granite is high-K (calc–alkaline) and peraluminous in nature, with high SiO2 (68.1 wt %–73.0 wt %) and Al2O3 (14.5 wt %–16.8 wt %), low TFe2O3 (1.10 wt %–2.49 wt %) and MgO (0.10 wt %–0.44 wt %), and high Sr/Y (19.9–102.0) and LaN/YbN (14.59–80.40), which is characteristic of high-Sr/Y I-type granite. The geochemical signatures, in combination with the presence of a large number of Paleoproterozoic inherited zircons, indicate that the Zhoujiapuzi granite was most likely derived from partial melting of the basement in the region, specifically the Liaoji granites. The high Sr/Y signature is inherited from these source rocks. Laser ablation–inductively coupled plasma mass spectrometer (LA-ICP-MS) zircon U–Pb dating of the autocryst zircons from two samples (from different localities) yielded consistent weighted average ages of 160.7 ± 1.1 Ma (mean squared weighted deviation – MSWD = 1.3) and 159.6 ± 1.1 Ma (MSWD = 1.2), with εHf(t) values in the range of −26.6 to −22.8. Morphological and chemical studies on autocrystic zircon grains show that there are two stages of zircon growth, interpreted as magmatic evolution in two distinct stages. The light-cathodoluminescence (light-CL) core reflects a crystallization environment of low oxygen fugacity and high TZr–Ti; the dark-CL rim formed with high oxygen fugacity and lower TZr–Ti. Based on the geochemical features and regional geological data, we propose that the Liaodong Peninsula in the Late Jurassic was part of a mature continental arc, with extensive melting of thick crust above the Paleo-Pacific subduction zone.

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Section: Tectonic Implicationssupporting

confidence: 57%

Whole-rock and zircon evidence for evolution of the Late Jurassic high-Sr ∕ Y Zhoujiapuzi granite, Liaodong Peninsula, North China Craton

Zeng

Allen²,

Mao³

et al. 2022

Solid Earth

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“…In typical collisional or accretionary orogens, deformation mainly takes place at plate boundaries and adjacent regions, since the continent interior is considered rigid (Coward et al., 1987). However, intensive deformation could develop inside the continent, even though it is far away from plate boundaries (e.g., Avouac et al., 1993; Chu & Lin, 2018; Chu et al., 2012; 2020; Dickinson & Snyder, 1978; Roure et al., 1989). East China was formed by the continental collision between North China Craton (NCC) and South China Block (SCB) at the Early Mesozoic (Cong et al., 1995; Faure et al., 1999; Hacker et al., 1998; Mattauer et al., 1985; S. T. Xu et al., 1992).…”

Section: Introductionmentioning

confidence: 99%

Episodic Crustal Extension and Contraction Characterizing the Late Mesozoic Tectonics of East China: Evidence From the Jiaodong Peninsula, East China

Meng

Lin

2021

Tectonics

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“…Li et al, 2022). Therefore, the formation of a cordillera in the Late-Permian-Middle Triassic suggests that this belt may have experienced a similar tectonic evolution than the Andean orogenic system, with the development of an orogenic plateau, as suggested by Chu et al (2020). The estimated width (i.e., ca.…”

Section: Geodynamic Implications Of Late Permian-triassic Lateral Flo...mentioning

confidence: 89%

Early Mesozoic Anatexis‐Induced Strain Partitioning and Gneiss Doming in the Yunkai Massif, South China: A Response to Contrasted Dynamics of Paleo‐Pacific and Paleo‐Tethys Subductions?

et al. 2022

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This study aims to decipher the structural impact of late anatexis in the core of polycyclic basements, like the Cathaysia Block (South China). Based on field mapping and detailed structural and kinematic analyses in the southern part of the Yunkai massif, we document anatexis-induced strain partitioning and gneiss dome formation. The exhumation of migmatites within gneiss domes occurred in a context of NE-SW regional extension coupled with syn-anatexis (a) horizontal lateral flow and vertical one in their cores, (b) strike-slip dominated flow at the limbs of domes, and (c) constrictive lateral flow at the external parts. Petrographic and microstructural analyses suggest that the cores of the gneiss domes and plutons recorded magmatic to sub-solidus deformation while strain localization at the top of gneiss domes is characterized by retrogressive shearing. Zircons U-Pb dating of diatexites and late-kinematic plutons give coherent crystallization ages of ca. 240 Ma, suggesting that the regional partial melting and gneiss doming occurred in the Triassic and probably as early as Late Permian, rather than during the Early Paleozoic as previously thought. A regional NE-SW lateral flow in the deep crust is fully compatible with NW-SE horizontal shortening, as also exemplified for Late Permian to Middle Triassic times in the whole Cathaysia and the Xuefengshan belt. Therefore, the Yunkai massif should no longer be considered as belonging to the Indosinian belt, instead, orogen-parallel crustal flow in the Yunkai massif looks rather controlled by the subduction of the Paleo-Pacific plate at the eastern margin of the South China Block.

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Cretaceous exhumation of the Triassic intracontinental Xuefengshan Belt: Delayed unroofing of an orogenic plateau across the South China Block?

Cited by 33 publications

References 100 publications

Whole-rock and zircon evidence for evolution of the Late Jurassic high-Sr ∕ Y Zhoujiapuzi granite, Liaodong Peninsula, North China Craton

Whole-rock and zircon evidence for evolution of the Late Jurassic high-Sr ∕ Y Zhoujiapuzi granite, Liaodong Peninsula, North China Craton

Episodic Crustal Extension and Contraction Characterizing the Late Mesozoic Tectonics of East China: Evidence From the Jiaodong Peninsula, East China

Early Mesozoic Anatexis‐Induced Strain Partitioning and Gneiss Doming in the Yunkai Massif, South China: A Response to Contrasted Dynamics of Paleo‐Pacific and Paleo‐Tethys Subductions?

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