New constraints on the Cretaceous geodynamics of paleo-Pacific plate subduction: Insights from the Xiaojiang–Beizhang granitoids, Zhejiang Province, southeast China

Liu, Liang; Hu, Ruizhong; Zhong, Hong; Tang, Yanwen; Yang, Jin‐Hui; Li, Zhen; Zhao, Jize; Shen, Nengping

doi:10.1016/j.lithos.2018.06.020

Cited by 11 publications

(2 citation statements)

References 72 publications

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“…Relative to the I-type granitoids, the water-poor nature of A-type granite in the Fuzhou complex was probably attributed to extensive degassing that led to the loss of most H 2 O during REEs and incompatible trace elements are from Sun and McDonough (1989) and hereafter. The grey square represents the literature data of I-type granitoids, grey triangle represents the literature data of A-type granites, and the shaded fields denote the trace element variation ranges of literature data (Chen et al, 2013(Chen et al, , 2019a(Chen et al, , 2019bGao et al, 2018;Liu et al, 2012Liu et al, , 2013Liu et al, , 2018. Data sources are listed in Table S1.…”

Section: Implications For A-type Granite Petrogenesismentioning

confidence: 99%

Magmatic degassing and fluid metasomatism promote compositional variation from I-type to peralkaline A-type granite in the late Cretaceous Fuzhou felsic complex, SE China

Zhang,

Guo,

Zhang

et al. 2024

American Mineralogist

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A-type granites generally have much lower water but higher temperature and incompatible element concentrations than I-type granitoids. Yet it remains unclear why I-A-type granitic complexes occur in convergent plate margins. Here we conduct geochemical analyses on apatite and mafic minerals from the late Cretaceous I-A-type granitic complex in Fuzhou area, SE China, aiming to decipher differentiation, fluid metasomatism and degassing that primarily control the compositional diversity of felsic magmas. Apatites in both rock types are F-rich and show large H 2 O and δD variations, i.e., 341 − 3892 ppm H 2 O and −325 − +336‰ δD in I-type granitoids; 67−1366 ppm H 2 O and −251 − +1439‰ δD in A-type granites. H 2 O in apatite is negatively correlated with La/Sm and Sr/Y in the I-type granitoids, whereas it is positively correlated with Ce and total rare earth element (REE) concentrations in the A-type granites. Once H 2 O decreases up to hundreds of ppm, both rock types show a rapid decrease of H 2 O/Ce, an increase of F/Cl and extensive H isotope fractionation. Arfvedsonite occurs as a late crystallizing mineral in the A-type granite and has much higher contents of Na 2 O, K 2 O, F and high field strength elements (HFSE) than hornblende in the I-type granitoids, indicating addition of F-HFSE-rich alkaline fluids during its magmatic evolution. The consumption of arfvedsonite and formation of aegirine further indicate the role of fluid metasomatism and H 2 degassing via a reaction of 3Na 3 Fe 5 Si 8 O 22 (OH) 2 + 2H 2 O = 9NaFeSi 2 O 6 + 2Fe 3 O 4 + 6SiO 2 +5H 2 .The combined geochemical data demonstrate that the systematic differences in mineral assemblage, whole-rock composition, magma temperature, H 2 O and δD of This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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Section: Implications For A-type Granite Petrogenesismentioning

confidence: 99%

Magmatic degassing and fluid metasomatism promote compositional variation from I-type to peralkaline A-type granite in the late Cretaceous Fuzhou felsic complex, SE China

Zhang,

Guo,

Zhang

et al. 2024

American Mineralogist

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“…The tectonic evolution of the coastal area of southeastern China since the Mesozoic has been a hot topic of research, still with many controversial issues in the early stage, including the sinistral strike-slip fault and continental rift model [47]), lithospheric extension and asthenospheric mantle upwelling [48], the Mesozoic rift in the eastern coast of China [49], the rise of Mesozoic mantle plume [50,51], the Alpine-type continental collision model [52], and the subduction of the paleo-Pacific subduction plate to the Eurasian plate [53][54][55][56][57][58]. At present, most scholars believe that the subduction of the paleo-Pacific plate to the Eurasian plate is the main dynamic mechanism driving the large-scale magmatism in southeastern China in the late Mesozoic.…”

Section: Tectonic Environment Analysismentioning

confidence: 99%

Zircon U-Pb Dating, Geochemistry, Lu-Hf Isotope Characteristics, and Geological Significance of Volcanic Rocks in Zhenghe Fozi Mountain National Geopark, Fujian, China

Chen,

Li,

Huang

et al. 2024

Minerals

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Fozi Mountain National Geopark is located in Zhenghe County in the northern region of Fujian Province, where the volcanic rocks of the Zhaixia Formation of the Shimaoshan Group are exposed. Zircon U-Pb dating and geochemical analysis were carried out to constrain its age and tectonic environment. The results show that three zircon U-Pb dating samples have attained ages of 99.2 ± 1.0 Ma, 99.6 ± 0.8 Ma, and 99.7 ± 2.0 Ma. Volcanic rocks in the core scenic area of Fozi Mountain were formed during the Late Cretaceous period. Elemental analysis showed that these volcanic rocks were dominated by the shoshonite series. They include gray dacite porphyry, grayish-white breccia tuff, volcanic agglomerate, and gray tuffaceous sandstone. These rocks were characterized by high silicon, high alkali content, and rich potassium levels. Lu-Hf isotope analysis of zircons revealed that their εHf(t) values varied from −8.7 to −6.8. The corresponding TDM2 values were primarily distributed in the range of 1.71 Ga to 1.59 Ga. These findings indicated that the magma primarily originated from the partial melting of the Mesoproterozoic crystalline basement, accompanied by a small number of mantle-derived materials. Tectonic environment analysis indicated that these rocks were formed in the post-orogenic intraplate extensional environment, which was associated with the back-arc extension or lithospheric thinning caused by the subduction of the paleo-Pacific plate beneath the Eurasian plate. The formation of these volcanic rocks was attributed to post-orogenic magmatism.

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Construction of a highly silicic upper crust in southeastern China: Insights from the Cretaceous intermediate-to-felsic rocks in eastern Zhejiang

Chen

Yang

Zhang

et al. 2021

Lithos

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New constraints on the Cretaceous geodynamics of paleo-Pacific plate subduction: Insights from the Xiaojiang–Beizhang granitoids, Zhejiang Province, southeast China

Cited by 11 publications

References 72 publications

Magmatic degassing and fluid metasomatism promote compositional variation from I-type to peralkaline A-type granite in the late Cretaceous Fuzhou felsic complex, SE China

Magmatic degassing and fluid metasomatism promote compositional variation from I-type to peralkaline A-type granite in the late Cretaceous Fuzhou felsic complex, SE China

Zircon U-Pb Dating, Geochemistry, Lu-Hf Isotope Characteristics, and Geological Significance of Volcanic Rocks in Zhenghe Fozi Mountain National Geopark, Fujian, China

Construction of a highly silicic upper crust in southeastern China: Insights from the Cretaceous intermediate-to-felsic rocks in eastern Zhejiang

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