Multi-stage magma evolution recorded by apatite and zircon of adakite-like rocks: A case study from the Shatanjiao intrusion, Tongling region, Eastern China
Abstract
The Shatanjiao pluton, located in the eastern Tongling region (Eastern China), is of great research significance for the study of magma evolutionary processes because this pluton is related to the regional Cu-Au mineralization. Zircon U-Pb dating on two granodiorite samples from this pluton yields ages of 141.9 ± 3.1 Ma (MSWD = 0.07) and 141.9 ± 3.3 Ma (MSWD = 0.03), respectively, which overlap the range of intense Late Jurassic to Early Cretaceous magmatism in the Tongling region. Based on the Sr content of apatite from the Shatanjiao granodiorites, they are subdivided into high-Sr apatite (apatite-I: 754–1242 ppm, mean = 1107 ppm) and low-Sr apatite (apatite-II: 415–613 ppm, mean = 507 ppm). Both apatite-I and apatite-II are characterized by high-Sr and -Sr/Y ratios and inconspicuous negative-Eu anomalies, indicating that these granodiorites have a likely adakite affinity. Considering their low-Rb contents (<0.05 ppm), in situ Sr isotopes of these apatite grains show 87Sr/86Sr ratios of 0.70848–0.71494 and 0.70767–0.71585 for apatite-I and apatite-II, respectively, indicating that the 87Sr/86Sr ratios of both apatite groups can represent the Sr isotopic compositions of their host rocks. Moreover, the La/Sm and Sr/Th ratios of both apatite groups suggest that the studied granodiorites might be sourced from the partial melting of subducted ocean slabs and overlying sediments. Based on their zircon trace element compositions, the calculated temperature and oxygen fugacity for the magma are characterized by high temperatures (mean T = 646 °C) and high oxygen fugacity (mean Ce4+/Ce3+ ratios = 341). On the basis of MgO, FeO, SiO2, and ΣREE contents of apatite, we further suggest that apatite-I and apatite-II might have crystallized at the early and late stages of magma evolution, respectively. Because apatite-I has much higher Eu/Eu* ratios (0.56–0.76) but lower (La/Yb)N ratios (7.85–28.6) than apatite-II of 0.39–0.58 and 95.9–132, respectively, it is indicated that plagioclase, garnet, hornblende, and zircon might control the trace element composition of melt during the magma evolutionary history, which were recorded by the apatite. Therefore, apatite can be an ideal tracer to reflect the sequence of multistage magma evolution.
Acknowledgments and Funding
We thank the anonymous reviewers and editor Justin Filiberto for their kind help on this manuscript, which cannot be perfect without the valuable comments and suggestions.This work was financed by the Natural Science Foundation of Anhui Province,China (Grant No. 2108085MD133), National Key Research and Development Plan (Grant No. 2018YFC0603902), PI Project of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (Grant No. GML2020GD0802), and the National Key R&D Program of China (No. 2016YFC0600404).
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Artikel in diesem Heft
- Alumino-oxy-rossmanite from pegmatites in Variscan metamorphic rocks from Eibenstein an der Thaya, Lower Austria, Austria: A new tourmaline that represents the most Al-rich end-member composition
- Fluorine partitioning between quadrilateral clinopyroxenes and melt
- Multi-stage magma evolution recorded by apatite and zircon of adakite-like rocks: A case study from the Shatanjiao intrusion, Tongling region, Eastern China
- The physical and chemical evolution of magmatic fluids in near-solidus silicic magma reservoirs: Implications for the formation of pegmatites
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- Polytypism in semi-disordered lizardite and amesite by low-dose HAADF-STEM
- Peralkalinity in peraluminous granitic pegmatites. I. Evidence from whewellite and hydrogen carbonate in fluid inclusions
- Peralkalinity in peraluminous granitic pegmatites. II. Evidence from experiments on carbonate formation in spodumene-bearing assemblages
- Ab initio study of structural, elastic and thermodynamic properties of Fe3S at high pressure: Implications for planetary cores
- Removal of barite from zircon using an aqueous solution of diethylenetriaminepentaacetic acid and potassium carbonate
- Improving grain size analysis using computer vision techniques and implications for grain growth kinetics
- Crystal chemistry of arsenian pyrites: A Raman spectroscopic study
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- Amphibole as a witness of chromitite formation and fluid metasomatism in ophiolites
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- Letter
- HP-PdF2-type FeCl2 as a potential Cl-carrier in the deep Earth
- New Mineral Names: Alteration Products
- American Mineralogist thanks the 2021 reviewers
Artikel in diesem Heft
- Alumino-oxy-rossmanite from pegmatites in Variscan metamorphic rocks from Eibenstein an der Thaya, Lower Austria, Austria: A new tourmaline that represents the most Al-rich end-member composition
- Fluorine partitioning between quadrilateral clinopyroxenes and melt
- Multi-stage magma evolution recorded by apatite and zircon of adakite-like rocks: A case study from the Shatanjiao intrusion, Tongling region, Eastern China
- The physical and chemical evolution of magmatic fluids in near-solidus silicic magma reservoirs: Implications for the formation of pegmatites
- Texture, geochemistry, and geochronology of titanite and pyrite: Fingerprint of magmatic-hydrothermal fertile fluids in the Jiaodong Au province
- Polytypism in semi-disordered lizardite and amesite by low-dose HAADF-STEM
- Peralkalinity in peraluminous granitic pegmatites. I. Evidence from whewellite and hydrogen carbonate in fluid inclusions
- Peralkalinity in peraluminous granitic pegmatites. II. Evidence from experiments on carbonate formation in spodumene-bearing assemblages
- Ab initio study of structural, elastic and thermodynamic properties of Fe3S at high pressure: Implications for planetary cores
- Removal of barite from zircon using an aqueous solution of diethylenetriaminepentaacetic acid and potassium carbonate
- Improving grain size analysis using computer vision techniques and implications for grain growth kinetics
- Crystal chemistry of arsenian pyrites: A Raman spectroscopic study
- Formation of the Maoniuping giant REE deposit: Constraints from mineralogy and in situ bastnäsite U-Pb geochronology
- Amphibole as a witness of chromitite formation and fluid metasomatism in ophiolites
- Ferro-papikeite, ideally NaFe2 2+(Fe32+Al2)(Si5Al3)O22(OH)2, a new orthorhombic amphibole from Nordmark (Western Bergslagen), Sweden: Description and crystal structure
- Letter
- HP-PdF2-type FeCl2 as a potential Cl-carrier in the deep Earth
- New Mineral Names: Alteration Products
- American Mineralogist thanks the 2021 reviewers