Zircon U‐Pb geochronology and geochemistry of the metabasite and gabbro: Implications for the Neoproterozoic and Paleozoic tectonic settings of the Qinzhou Bay‐Hangzhou Bay suture zone, South China

Yu, Pengpeng; Zheng, Yi; Zhou, Yongzhang; Chen, Binghui; Jia, Ning; Yang, Wei

doi:10.1002/gj.3060

Cited by 13 publications

(2 citation statements)

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“…In comparison, the synchronous mafic and volcanic rocks, which are crucial for understanding the nature of the orogen, are rare and not well studied. However, recent studies have reported several small‐scale Paleozoic mafic rock outcrops in South China, such as Chayuanshan, Chencai region, Dakang, Longhugang, Wugongshan, and Zhuya (Wang, Fan, et al, ; Yao et al, ; Yu et al, ; Zhang et al, ; Zhao, Zhai, Zhou, Santosh, & Ma, ; Zhong et al, ). Besides, Zhang et al () has reported several Silurian (435–445 Ma) felsic volcanic rocks in the northern and southern Guangdong Province.…”

Section: Geological Settingmentioning

confidence: 99%

Geochronology and geochemistry of Early Silurian felsic volcanic rocks in the Dabaoshan ore district, South China: Implications for the petrogenesis and geodynamic setting

Qin

et al. 2018

Geological Journal

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The Early Paleozoic orogeny in South China has remained controversial in the long run with debate over intracontinental orogeny versus plate subduction. Limited studies have focused on the Early Paleozoic volcanic rocks in South China, which is crucial for us to understand the tectonic evolution of the South China Block. The Dabaoshan Fe–Cu–Pb–Zn–Mo–W orefield, one of the largest polymetallic deposits in South China, is hosted by Paleozoic volcanic‐sedimentary rocks and Mesozoic granitic porphyry. In this study, zircon U–Pb dating yielded ages of 439.4 ± 2.7 Ma, 439.3 ± 3.2 Ma, and 442.0 ± 2.2 Ma for the Dabaoshan dacite. These ages are all in good agreement within errors and indicate that the dacite formed during the early Silurian (ca. 440 Ma). The dacites are slightly peraluminous, calc‐alkaline with relatively high K2O + Na2O, FeOt, TiO2, CaO/Na2O ratios, and small negative Eu anomalies. They show enrichment in LILEs and LREE and depletion in Ba, Nb, Sr, P, and Ti. It has high initial 87Sr/86Sr values (0.70983–0.71140) and negative εNd(t) values ranging from −7.6 to −10 with T2DM ages of 1.80–1.99 Ga, εHf(t) values from −4.95 to −15.48 with T2DM ages of 1.72 Ga to 2.38 Ga. The overlapped Nd–Hf two‐stage model ages range from 1.89 Ga to 1.99 Ga, which indicates that the Dabaoshan dacite originated from a Paleoproterozoic source. Combining these geochemical and in situ zircon Hf isotopic data, we propose that the Dabaoshan dacite may have originated from the partial melting of mixed source of Paleoproterozoic metasedimentary and metaigneous rocks as a result of underplating of mafic magma during the post‐orogenic collapse and extension followed by lithospheric thining and asthenospheric mantle upwelling in an intraplate setting. Based on field observation and the geochronology results, we propose that the stratiform Cu–Pb–Zn mineralization may be related with the early Silurian volcanic rocks.

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Section: Geological Settingmentioning

confidence: 99%

Geochronology and geochemistry of Early Silurian felsic volcanic rocks in the Dabaoshan ore district, South China: Implications for the petrogenesis and geodynamic setting

Qin

et al. 2018

Geological Journal

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“…Previous studies show that these granites are dominated by S‐type granites and with negative ε Nd (t) and ε Hf (t) values (Tan et al, 2020; Wang et al, 2013; Zhang et al, 2009). Because the South China Ocean closed at approximately 820 Ma and because of the presence of small‐scale mafic igneous rocks and ophiolites caused by subduction and collision, as well as a lack of representative island‐arc volcanic rocks in the area, most researchers attribute the Early Palaeozoic tectonic setting of the SCB to intracontinental orogenesis (Shu, 2006; Faure et al, 2009; Li et al, 2010; Shu et al, 2014; Yu et al, 2016; Yu, Zhou, et al, 2017; Yu et al, 2018, Yu, Zheng, et al, 2022, Yu, Zhou, et al, 2022; Wang et al, 2007, 2011, 2013, 2018; Nong et al, 2020). However, some researchers believe that the Cathaysia and Yangtze blocks did not close during the Neoproterozoic.…”

Section: Introductionmentioning

confidence: 99%

Geochronology and petrogenesis of the Early Palaeozoic Fuxi magnesian granodiorite in southern Zhuguangshan, South China Block and its geodynamic significance

Zhou

Dai

et al. 2022

Geological Journal

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This study provides relevant data on the granodiorite in southern Zhuguangshan, South China Block (SCB), including mineralogical information, zircon U-Pb ages, zircon Hf isotope data, whole-rock geochemical data, and Sr-Nd-Pb isotopic data. These data indicate that the granodiorite in southern Zhuguangshan crystallized at approximately 448.7 Ma. The hornblende and micas of the granodiorites are magnesio-hornblende and Mg-rich biotite, respectively. The granodiorite samples are characterized by relatively high SiO 2 contents of 61.72-66.19 wt.%, K 2 O contents of 3.77-5.18 wt.%, Na 2 O contents of 2.42-3.16 wt.%, low FeO T contents of 3.93-5.79 wt.%, and relatively high MgO contents of 1.78-2.55 wt.%, with Mg # values (molar Mg/[Mg + Fe] Â 100) of 43-50. The contents of rare earth elements (REEs)in the granodiorite specimens are 166-283 ppm, and the REEs show both a chondrite-normalized REE pattern that inclines rightward and slightly negative Eu anomalies (0.62-0.90). The Fuxi granodiorite is rich in large-ion lithophile elements (LILEs; Rb, Th, U, and K) but is depleted in high-field-strength elements (HFSEs; Nb, Ta, and Ti). All the samples have similar Sr-Nd-Pb and zircon Hf isotopic compositions and have a ( 87 Sr/ 86 Sr) i ratio of 0.707319-0.710888, a ( 143 Nd/ 144 Nd) i ratio of 0.511705-0.511760, a ( 206 Pb/ 204 Pb) t ratio of 17.918-18.459, a ( 207 Pb/ 204 Pb) t ratio of 15.711-15.813, and a ( 208 Pb/ 204 Pb) t ratio of 37.953-38.563. The ε Nd (t) and ε Hf (t) values range from À7.12 to À5.88 and from À9.81 to À4.45, respectively, with corresponding two-stage Nd model ages of 1.66-1.76 Ga and two-stage Hf model ages of 1.55-1.78 Ga. These findings indicate that the granodiorite is magnesian andesite and that the magmas are derived from a mixture of crustal and mantle materials. Based on these findings in combination with previous research results, it can be concluded that the mantle beneath the Cathaysia Block was moderately depleted during the Early Palaeozoic and that Early Palaeozoic magmatism may be related to Early Palaeozoic oceanic crust subduction.

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Origin of the Heping granodiorite pluton: Implications for syn-convergent extension and asthenosphere upwelling accompanying the early Paleozoic orogeny in South China

Xie

Zhao

et al. 2020

Gondwana Research

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Zircon U‐Pb geochronology and geochemistry of the metabasite and gabbro: Implications for the Neoproterozoic and Paleozoic tectonic settings of the Qinzhou Bay‐Hangzhou Bay suture zone, South China

Cited by 13 publications

References 87 publications

Geochronology and geochemistry of Early Silurian felsic volcanic rocks in the Dabaoshan ore district, South China: Implications for the petrogenesis and geodynamic setting

Geochronology and geochemistry of Early Silurian felsic volcanic rocks in the Dabaoshan ore district, South China: Implications for the petrogenesis and geodynamic setting

Geochronology and petrogenesis of the Early Palaeozoic Fuxi magnesian granodiorite in southern Zhuguangshan, South China Block and its geodynamic significance

Origin of the Heping granodiorite pluton: Implications for syn-convergent extension and asthenosphere upwelling accompanying the early Paleozoic orogeny in South China

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