Volume 46 Issue 12
Dec.  2021
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Chen Jie, Gong Yingli, Chen Lu, Xiang Mi, Tian Shihong, 2021. New Advances in Magnesium Isotope Geochemistry and Its Application to Carbonatite Rocks. Earth Science, 46(12): 4366-4389. doi: 10.3799/dqkx.2021.140
Citation: Chen Jie, Gong Yingli, Chen Lu, Xiang Mi, Tian Shihong, 2021. New Advances in Magnesium Isotope Geochemistry and Its Application to Carbonatite Rocks. Earth Science, 46(12): 4366-4389. doi: 10.3799/dqkx.2021.140
shu

New Advances in Magnesium Isotope Geochemistry and Its Application to Carbonatite Rocks

doi: 10.3799/dqkx.2021.140
  • 1.

    State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China

  • 2.

    Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China

  • 3.

    MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

  • Received Date: 2021-06-11
  • Publish Date: 2021-12-15
    Abstract
  • There are three magnesium (Mg) isotopes, 24Mg, 25Mg and 26Mg, among which the relative mass difference of 26Mg and 24Mg is large, up to 8.33%. Such a large relative mass difference can cause significant mass dependent fractionation of Mg isotopes due to the changes of chemical and physical conditions during crustal activities or other geological processes. Variations of δ26Mg in nature are mainly from -5.60‰ to 0.92‰, spanning a limited range of 6.5‰. Mg isotope is a potential geochemical index and tracer for geological processes because Mg fractionates significantly in low-temperature geochemical processes, but not in high-temperature environments. Mg isotopes have made important progress in the fields of low-temperature weathering, high-temperature partial melting and magmatic crystallization differentiation, metamorphism, plate subduction, crust-mantle material recycling, hydrothermal alteration and genesis of deposits. In this paper, the analysis methods of Mg isotopes are briefly introduced firstly. Secondly, the composition and distribution characteristics of Mg isotopes in various reservoirs of the earth and the fractionation mechanism of Mg isotopes in geological processes are systematically summarized. And then, the application of magnesium isotopes in the study of carbonatites in recent years is emphatically introduced. Finally, it discusses the origin of low δ26Mg in mantle-derived rocks (related to carbonate rocks of subduction and recycling, oceanic crust materials or mineral separation crystallization) and trace the petrogenesis of magmatic carbonatites by the combination of Li, Mg and Ca isotopes. At the end of this paper, the advantages of the dual-path collision cell-capable multiple-collector inductively coupled plasma mass spectrometer (Nu Sapphire MC-ICP-MS) and the application of Li-Mg-Ca and other metal isotopes in the enrichment mechanisms of rare earth elements are prospected.

     

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