Iron isotope compositions of carbonatites record melt generation, crystallization, and late-stage volatile-transport processes

Johnson, Clark M.; Bell, Keith; Beard, Brian L.; Shultis, Aaron I.

doi:10.1007/s00710-009-0055-4

Cited by 30 publications

(21 citation statements)

References 66 publications

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“…Johnson, 2004, Williams et al, 2004;Johnson et al, 2010;Zhao et al, 2010; and in metamorphic rocks (Dauphas et al, 2007;Frost et al, 2007;Valaas Hysolp et al, 2008). However, the origin of these variations is generally unclear.…”

Section: Equilibrium Fractionation Factors Between Spinels and Olivinesmentioning

confidence: 93%

Spinel–olivine–pyroxene equilibrium iron isotopic fractionation and applications to natural peridotites

Roskosz

Sio

Dauphas

et al. 2015

Geochimica et Cosmochimica Acta

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Eight spinel-group minerals were synthesized by a flux-growth method producing spinels with varying composition and Fe 3+ /Fetot ratios. The mean force constants of iron bonds in these minerals were determined by synchrotron Nuclear Resonant Inelastic X-ray Scattering (NRIXS) in order to determine the reduced isotopic partition function ratios (β β β β-factors) of these spinels. The mean force constants are strongly dependent on the Fe 3+ /Fetot of the spinel but are independent, or weakly dependent on other structural and compositional parameters. From our spectroscopic data, it is found that a single redoxdependent calibration line accounts for the effects of Fe 3+ /Fetot on the β β β β-factors of spinels. This calibration successfully describes the equilibrium Fe isotopes fractionation factors between spinels and silicates (olivine and pyroxenes). Our predictions are in excellent agreement with independent determinations for the equilibrium Fe isotopic fractionations for the magnetite-fayalite and the magnetite-hedenbergite couples. Our calibration applies to the entire range of Fe 3+ /Fetot ratios found in natural spinels and provides a basis for interpreting iron isotopic variations documented in mantle peridotites. Except for a few exceptions, most of the samples measured so far are in isotopic disequilibrium, reflecting metasomatism and partial melting processes.

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Section: Equilibrium Fractionation Factors Between Spinels and Olivinesmentioning

confidence: 93%

Spinel–olivine–pyroxene equilibrium iron isotopic fractionation and applications to natural peridotites

Roskosz

Sio

Dauphas

et al. 2015

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

show abstract

“…Various natural and biological processes are known to fractionate these, leading to significant variations in iron isotope ratios in different geological environments (e.g., Anbar et al 2000;Craddock and Dauphas 2011;Dauphas and Rouxel 2006;Johnson and Beard 2006;Johnson et al 2010 Fig. 1; Richter et al 2009).…”

Section: Iron Isotopesmentioning

confidence: 99%

Iron isotope analysis of red and black pigments on pottery in Nasca, Peru

Eerkens

Barfod

Vaughn

et al. 2013

Archaeol Anthropol Sci

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“…The study by Johnson et al (2009) "Iron isotope compositions of carbonatites record melt generation, crystallization, and late-stage volatile-transport processes", documents the first Fe isotope study on carbonatites, including whole-rocks and mineral phases. Their results indicate that carbonatites define the largest range in Fe isotope compositions yet measured for igneous rocks.…”

mentioning

confidence: 93%

Carbonatites, alkaline rocks and the mantle: a special issue dedicated to Keith Bell

2010

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Iron isotope compositions of carbonatites record melt generation, crystallization, and late-stage volatile-transport processes

Cited by 30 publications

References 66 publications

Spinel–olivine–pyroxene equilibrium iron isotopic fractionation and applications to natural peridotites

Spinel–olivine–pyroxene equilibrium iron isotopic fractionation and applications to natural peridotites

Iron isotope analysis of red and black pigments on pottery in Nasca, Peru

Carbonatites, alkaline rocks and the mantle: a special issue dedicated to Keith Bell

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