Oxygen and Hydrogen Diffusion in Minerals

Farver, John R.

doi:10.2138/rmg.2010.72.10

Cited by 112 publications

(90 citation statements)

References 146 publications

(426 reference statements)

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“…This behavior is consistent the compensation (Meyer-Neldel) rule-i.e., the empirical phenomenon that activation energies and pre-exponential factors of related chemical processes are typically correlated (e.g., Yelon et al, 1992). A consequence of this effect is that the rates of chemical processes with a shared mechanism, such as the diffusion of species through similar crystal structures, tend to diverge at low temperatures and converge at a high temperature (Brady and Cherniak, 2010;Farver, 2010). The diffusivities of different elements in carbonates have an unusually strong adherence to the compensation rule (r 2 = 0.97; Brady and Cherniak, 2010), perhaps due to their simple stoichiometry and similar crystal structures.…”

Section: Comparisons With Calcite Reordering Parametersmentioning

confidence: 99%

Experimental calibration of clumped isotope reordering in dolomite

Lloyd

Ryb

Eiler

2018

Geochimica et Cosmochimica Acta

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Section: Comparisons With Calcite Reordering Parametersmentioning

confidence: 99%

Experimental calibration of clumped isotope reordering in dolomite

Lloyd

Ryb

Eiler

2018

Geochimica et Cosmochimica Acta

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“…For example, Dohmen and Chakraborty (2007) showed that the Fe-Mg interdiffusion in olivine increases exponentially with the mole fraction of fayalite (lnD is linear to X Fa ). Diffusion of the hydrous component in orthopyroxenes depends strongly on the composition of orthopyroxenes (Farver 2010). If the aforementioned influencing factors (T, P, fO 2 , C H2O , X Fe ) are simultaneously taken into account, the diffusion coefficient can be rewritten (Jaoul et al 1995;Dohmen and Chakraborty 2007;Farver 2010):…”

Section: Compositionmentioning

confidence: 99%

Diffusion in garnet: a review

Zhang

2017

Acta Geochim

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With improvements on high-pressure experimental techniques in multi-anvil apparatus and the development of new analytical tools, major progress has been made on diffusion in garnets in the past several decades. The data obtained in the experimental determination of diffusion coefficients in garnets are of fundamental importance for diffusion modeling and timescales of geological and planetary processes. In this review, we have compiled experimental data on self-diffusion (Si, O, cations), trace element diffusion (Li, Y, Ga, Cr, Sr, REEs), and interdiffusion (CaFe/Mg, Si-Al) in garnet in the light of new advances and recent applications. In addition, some empirical relationships among diffusion parameters (pre-exponential factor D 0 , activation energy E, ionic radius) are also discussed. We hope that this review can provide a useful data digest and guide to future study of diffusion in garnet.

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“…H 2 O diffusion in olivine has larger uncertainties than that in melt. Experimental determinations of H + diffusion coefficients in olivine span at least three orders of magnitude (Farver, 2010), due to multiple proposed mechanisms that may dominate under different fO 2 and fH 2 O regimes (Kohlstedt and Mackwell, 1998). For the October 17 MIs, estimates for ascent span more than an order of magnitude based on the assumed diffusion mechanism in olivine (Lloyd et al, 2013), from <12 m/s if the fast redox mechanism dominates (Kohlstedt and Mackwell, 1998) and <0.5 m/s if the slow metal vacancy mechanism dominates (Demouchy and Mackwell, 2006).…”

Section: Implications For the 1974 Fuego Eruptionmentioning

confidence: 99%