镁同位素地球化学

1区 地球科学 Q1 Earth and Planetary Sciences
F. Teng
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引用次数: 252

摘要

镁(Mg)的原子序数为12,属于元素周期表中的碱土元素(族II)。纯Mg是一种银白色金属,熔点为650℃,沸点为1090℃,在1个标准大气压下(Lide 1993-1994)。Mg的电子构型为[Ne]3s2,具有较低的电离能,这使得Mg离子具有2+的共价态和0.72 a的典型离子半径(Shannon 1976)。镁是一种主要元素,广泛分布于硅酸盐土、水圈和生物圈中(图1a)。它是地球上第四丰富的元素(仅次于O, Fe和Si, MgO = 25.5 wt%) (McDonough and Sun 1995),大陆地壳中第五丰富的元素(MgO = 4.66 wt%) (Rudnick and Gao 2003),海水中第二丰富的阳离子(仅次于Na, Mg = 0.128 wt%) (Pilson 2013)。尽管如此,由于地幔的高MgO含量(37.8 wt%, McDonough and Sun 1995)和质量分数,地球上的Mg含量> 99.9%。镁在硅酸盐土中的高丰度使其成为火成岩、变质岩和沉积岩中矿物(如橄榄石、辉石、石榴石、角闪孔、云母、尖晶石、碳酸盐、硫酸盐和粘土矿物)的主要成分。镁有三种稳定同位素,质量数分别为24、25和26,典型丰度分别为78.99%、10.00%和11.01% (Berglund and Wieser 2011)(图1b),标准原子量为24.305 (CIAAW 2015)。由于质谱法的局限性,以前的许多Mg同位素研究都集中在与质量无关的同位素异常上,以寻找由短寿命的26Al衰变产生的放射性成因的26Mg (Gray and Compston 1974;李和……
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Magnesium Isotope Geochemistry
Magnesium (Mg) has an atomic number of 12 and belongs to the alkaline earth element (Group II) of the Periodic Table. The pure Mg is a silvery white metal and has a melting point of 650 °C and boiling point of 1090 °C at 1 standard atmosphere (Lide 1993–1994). The electronic configuration of Mg is [Ne]3s2, with low ionization energies, which makes Mg ionic in character with a common valance state of 2+ and a typical ionic radius of 0.72 A (Shannon 1976). Magnesium is a major element and widely distributed in the silicate Earth, hydrosphere and biosphere (Fig. 1a). It is the fourth most abundant element in the Earth (after O, Fe and Si, MgO = 25.5 wt%) (McDonough and Sun 1995), the fifth most abundant element in the bulk continental crust (MgO = 4.66 wt%) (Rudnick and Gao 2003) and the second most abundant cation in seawater (after Na, Mg = 0.128 wt%) (Pilson 2013). Nonetheless, the mantle has > 99.9% of Mg in the Earth because of its high MgO content (37.8 wt%, McDonough and Sun 1995) and mass fraction. The high abundance of Mg in the silicate Earth makes it a major constituent of minerals (e.g., olivine, pyroxene, garnet, amphibole, mica, spinel, carbonate, sulfate, and clay minerals) in igneous, metamorphic and sedimentary rocks. Magnesium has three stable isotopes, with mass numbers of 24, 25 and 26, and typical abundances of 78.99%, 10.00% and 11.01%, respectively (Berglund and Wieser 2011) (Fig. 1b), and a standard atomic weight of 24.305 (CIAAW 2015). Because of the limitations in the mass spectrometry, many previous Mg isotopic studies have concentrated on either mass independent isotope anomalies to look for the radiogenic 26Mg produced by the decay of short-lived 26Al (Gray and Compston 1974; Lee and …
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来源期刊
Reviews in Mineralogy & Geochemistry
Reviews in Mineralogy & Geochemistry 地学-地球化学与地球物理
CiteScore
8.30
自引率
0.00%
发文量
39
期刊介绍: RiMG is a series of multi-authored, soft-bound volumes containing concise reviews of the literature and advances in theoretical and/or applied mineralogy, crystallography, petrology, and geochemistry. The content of each volume consists of fully developed text which can be used for self-study, research, or as a text-book for graduate-level courses. RiMG volumes are typically produced in conjunction with a short course but can also be published without a short course. The series is jointly published by the Mineralogical Society of America (MSA) and the Geochemical Society.
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