Yangshan A-Type Granites in the Lower Yangtze River Belt Formed by Ridge Subduction: Radiogenic Ca and Nd Isotopic Constraints

Bai, Jianghao; Ling, Ming‐Xing; Yang, Xiaoyong; Liu, Fang; Gu, Huangling; Luo, Ze-Bin; Jiang, Xingming; Zhang, Zhaofeng

doi:10.1007/s12583-021-1588-7

Cited by 5 publications

(7 citation statements)

References 69 publications

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“…Previous studies have demonstrated that 3 40 Ca is a robust tracer in petrogenesis, early crustmantle evolution, the oceanic Ca cycle and post-formation K depletion of thelower continental crust. 2,3,[33][34][35][36][37] A new generation dual-path MC-ICP-MS equipped with a collision cell (CC-MC-ICP-MS), known as the Sapphire, was launched by Nu Instruments in 2017. The collision cell technique has been used in conjunction with quadrupole ICP-MS for nearly 20 years.…”

Section: Introductionmentioning

confidence: 99%

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High-precision analysis of calcium isotopes using a Nu Sapphire collision cell (CC)-MC-ICP-MS

Gao

et al. 2022

J. Anal. At. Spectrom.

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Section: Introductionmentioning

confidence: 99%

“…Previous studies have demonstrated that ε 40 Ca is a robust tracer in petrogenesis, early crust-mantle evolution, the oceanic Ca cycle and post-formation K depletion of thelower continental crust. 2,3,33–37…”

Section: Introductionmentioning

confidence: 99%

High-precision analysis of calcium isotopes using a Nu Sapphire collision cell (CC)-MC-ICP-MS

Gao

et al. 2022

J. Anal. At. Spectrom.

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“…In addition to being controlled by the nature of the magma source, the F/Cl of apatite will also decrease during the evolution of the magma (Jiang et al., 2018). Further research has revealed that A‐type granites in LYRB may have originated from the same source, consisting of a mixture of Neoproterozoic crust and asthenospheric mantle in different proportions, as shown by recent studies of radiogenic Ca and Nd isotopes (Bai et al., 2022). The high degree of spatiotemporal consistency among A‐type granites in LYRB, as evidenced by their comparable Sr, Nd, Hf, and radiogenic Ca isotopic compositions (Table S2 and Figure S1 in Supporting Information , Figure 2), suggests they were mixed by crust‐mantle and locally affected by subduction fluid, making it difficult to subdivide them into distinct categories.…”

Section: Resultsmentioning

confidence: 93%

The Genesis of A‐Type Granites in Lower Yangtze River Belt: Evidence From Calcium Isotopes

Luo,

Ling,

et al. 2024

Geochem Geophys Geosyst

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A‐type granite is a favorable rock for the study of crustal evolution, crust‐mantle interaction and metallogenesis. However, the origin of A‐type granite remains controversial. In this study, we report high‐precision Ca isotopic compositions of a co‐genetic suite of A‐type granites from the Lower Yangtze River Belt (LYRB) in eastern China. Our results show that the δ44/40Ca of the A‐type granites ranges from 0.55 ± 0.11‰ to 1.44 ± 0.06‰, and is negatively correlated with CaO, Sr and Ba contents and Eu/Eu*, indicating that the Ca isotope fractionation of A‐type granites is dominated by plagioclase and potassium feldspar. There is kinetic fractionation of Ca isotopes during A‐type granite magma evolution. Sample BSL‐7, the least evolved sample, revealed that it had a low δ44/40Ca of 0.59‰, which is significantly lower than that of the upper continental crust (δ44/40Ca = 0.71–0.72‰) and the bulk silicate earth (δ44/40Ca = 0.94‰). The low δ44/40Ca can be best explained by partial melting of the enriched mantle metasomatized by subduction material. Combined with the geodynamic background of the LYRB, we propose that the formation of A‐type granites in the LYRB originates from partial melting of the enriched mantle, triggered by early Cretaceous ridge subduction of the Pacific and Izanagi plates.

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“…Copper deposits are closely associated with adakites with high oxygen fugacity and show geochemical characteristics of partial melting of subducted oceanic crust. [129][130][131] This is followed by Nb-enriched basalts, 119,132,133 A-type granites [134][135][136][137][138][139] and IOCG deposits. Similar to the LYRB, the Xuhuai region also has adakite 140 of slab melting origin and IOCG deposits, 2,141 although it is much less developed compared to the LYRB.…”

Section: Late Mesozoic Geologic Events In Eastern Chinamentioning

confidence: 98%

Reconstruction of the Pacific plate: Constraints from ocean floor and eastern China

Sun¹,

Li²

2023

TIG

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<p>Magnetic anomalies show that the Pacific plate rotated counterclockwise by ~50��, induced by the eruption of the Ontong Java Plateau at ~125 Ma. Meanwhile, the drifting direction of the Pacific plate also changed from southwestward (~265��) to northwestward (~300��). The rotation promoted the destruction of the North China Craton (NCC) and induced slab rollback, which was responsible for the Cretaceous large-scale magmatism and mineralization in eastern China. Correspondingly, the orientation of the spreading ridge between the Pacific and Izanagi plates has also changed, which was originally towards ~290�� before 125 Ma. Such a configuration is consistent with Late Mesozoic geologic events in eastern China. The spatiotemporal distribution of magmatic rocks and ore deposits suggests that the Pacific plate began to subduct southwestward underneath southeastern China in the Early Jurassic (��175 Ma), and reached the Nanling Mountains. In contrast, the Izanagi Plate was still connected to the NCC before ~170 Ma. Its northwestward drift before/during subduction initiation resulted in compression that wedged the NCC into the East Asian continent and resulted in fold belts in three directions in weak zones surrounding the NCC and strike-slip faults along the south and the north margins (known as Event A of the Yanshanian Movement [165-170 Ma]). This is followed by extension during slab rollback. The Izanagi plate rotated clockwise by ~50�� between 149.35 Ma and 140.42 Ma, which was coincident with commencement of Event B of the Yanshanian Movement, both of which resulted from the collision between a micro-continent on the Izanagi plate and eastern China.</p>

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Yangshan A-Type Granites in the Lower Yangtze River Belt Formed by Ridge Subduction: Radiogenic Ca and Nd Isotopic Constraints

Cited by 5 publications

References 69 publications

High-precision analysis of calcium isotopes using a Nu Sapphire collision cell (CC)-MC-ICP-MS

High-precision analysis of calcium isotopes using a Nu Sapphire collision cell (CC)-MC-ICP-MS

The Genesis of A‐Type Granites in Lower Yangtze River Belt: Evidence From Calcium Isotopes

Reconstruction of the Pacific plate: Constraints from ocean floor and eastern China

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