Contrasting lithium and magnesium isotope fractionation during continental weathering

Teng, Fang‐Zhen; Li, Wang-Ye; Rudnick, Roberta L.; Gardner, Leonard Robert

doi:10.1016/j.epsl.2010.09.036

Cited by 269 publications

(137 citation statements)

References 66 publications

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“…Black et al, 2008;Bolou-Bi et al, 2010;Li et al, 2010;Wimpenny et al, 2010;Opfergelt et al, 2012Opfergelt et al, , 2014Pogge von Strandmann et al, 2008;Shirokova et al, 2013;Teng et al, 2010;Tipper et al, 2010;Hwang et al, 2012;Ilina et al, 2103;Mavromatis et al, 2012Mavromatis et al, , 2014. Such processes could lead to global riverine fluxes that are isotopically lighter in Mg compared to the homogenous chondritic composition of the Earth's mantle (Tipper et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

The efficient long-term inhibition of forsterite dissolution by common soil bacteria and fungi at Earth surface conditions

Oelkers

Benning

Lutz

et al. 2015

Geochimica et Cosmochimica Acta

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Section: Introductionmentioning

confidence: 99%

The efficient long-term inhibition of forsterite dissolution by common soil bacteria and fungi at Earth surface conditions

Oelkers

Benning

Lutz

et al. 2015

Geochimica et Cosmochimica Acta

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“…[5,6] For example, a precision of AE0.07% ( 26 Mg/ 24 Mg, 2SD) can be routinely achieved for MC-ICP-MS Mg isotopic analysis, [7] which is sufficient to discriminate mass-dependent Mg isotopic variations in natural samples. [6] Recent high-precision Mg isotopic studies have significantly increased our knowledge of Mg isotope geochemistry by documenting the Mg isotopic variations in the mantle and crustal rocks, [5,[7][8][9][10][11][12][13][14][15][16][17][18] and illuminating the processes that may produce these variations, e.g. igneous differentiation, metamorphic dehydration, and continental weathering.…”

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confidence: 99%

“…igneous differentiation, metamorphic dehydration, and continental weathering. [7,9,11,14,15,17,19] Nevertheless, debate continues regarding: (1) whether the earth has a chondritic Mg isotopic composition or not, [7][8][9]13,18,20] and (2) the accuracy of Mg isotopic compositions reported by different labs for certain geostandards, such as BCR-1, BCR-2 and San Carlos olivine. [5,9,10,12,13,16,18,[20][21][22][23][24][25] Both debates may reflect the presence of MC-ICP-MS analytical artifacts in high-precision Mg isotopic analyses conducted at different laboratories.…”

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confidence: 99%

“…26 Mg values, [7,[13][14][15]18,[23][24][25][27][28][29] its use also does not test for sample preparation accuracy and reproducibility, since the pure Mg standard needs no sample preparation as is necessary for natural samples. Reliance on this standard for inter-laboratory comparison leaves the Mg isotope science community open to major problems in accuracy assessment and comparability because sample preparation processes, e.g.…”

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confidence: 99%

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Homogeneous magnesium isotopic composition of seawater: an excellent geostandard for Mg isotope analysis

Ling

Sedaghatpour

Teng

et al. 2011

Rapid Comm Mass Spectrometry

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The magnesium (Mg) isotopic compositions of 40 seawater samples from the Gulf of Mexico and of one seawater sample from the southwest Hawaii area were determined by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) to investigate the homogeneity of Mg isotopes in seawater. The results indicate that the Mg isotopic composition of seawater from the Gulf of Mexico is homogeneous, both vertically and horizontally, with average values for d 25 Mg = À0.43 AE 0.06 (2SD, n = 90). The magnesium isotopic composition of seawater is principally controlled by river water input, carbonate precipitation and oceanic hydrothermal interactions. The homogeneous Mg isotopic composition of seawater indicates a steady-state budget in terms of Mg isotopes in oceans, consistent with a long Mg residence time (~13 Ma). Considering that seawater is homogeneous, readily available in large amounts, can be easily accessed and processed for isotopic analysis, and has an isotopic composition near the middle of the natural range of variation, it is an excellent geostandard for accuracy assessment to rule out analytical artifacts during high-precision Mg isotopic analysis.

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“…It is well known that the variation of Mg isotope compositions is limited during high-temperature geological processes (Teng et al 2007(Teng et al , 2010aHandler et al 2009;Yang et al 2009;Bourdon et al 2010;Dauphas et al 2010;Pogge von Strandmann et al 2011;Xiao et al 2013), but is quite large during low-temperature processes (Pogge von Strandmann et al 2008;Teng et al 2010b;Tipper et al 2010;Huang et al 2012;Liu et al 2014). Just like other fluid-mobile elements, Mg displays a highly variable and remarkably discrepant isotope composition in the upper continental crust (Shen et al 2009;Huang et al 2013) and the hydrosphere (Tipper et al 2006;Foster et al 2010;Ling et al 2011) when compared with the relatively homogeneous mantle (d 26 Mg = -0.25 ± 0.07‰, Teng et al 2010a).…”

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The deep continental crust has a larger Mg isotopic variation than previously thought

Zhang

2016

American Mineralogist

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Magnesium isotope compositions of the bulk continental crust is a key to understand Mg isotope behaviors during crustal processes, and is the prerequisite to study mantle-crust material exchange/reaction by Mg isotopes. However, thus far, little is known about Mg isotopic compositions of the middle and lower continental crust. In the article by Yang et al. in this issue entitled "Magnesium isotopic composition of the deep continental crust," the authors present high-precision Mg isotopic analyses of highgrade metamorphic terrane samples and granulite xenoliths from China, which represent the middle and lower continental crust, respectively. Large Mg isotopic variation is observed in the deep continental crust, reflecting the combination of several processes, such as continental weathering, involvement of supracrustal materials, and fluid metasomatism. In addition, this article also provides an average Mg isotope composition of the bulk continental crust, which is crucial to future applications of Mg isotopes.

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Contrasting lithium and magnesium isotope fractionation during continental weathering

Cited by 269 publications

References 66 publications

The efficient long-term inhibition of forsterite dissolution by common soil bacteria and fungi at Earth surface conditions

The efficient long-term inhibition of forsterite dissolution by common soil bacteria and fungi at Earth surface conditions

Homogeneous magnesium isotopic composition of seawater: an excellent geostandard for Mg isotope analysis

The deep continental crust has a larger Mg isotopic variation than previously thought

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