Equilibrium interface segregation in the diopside–forsterite system II: Applications of interface enrichment to mantle geochemistry

Hiraga, Takehiko; Hirschmann, M. M.; Kohlstedt, D. L.

doi:10.1016/j.gca.2006.11.020

Cited by 43 publications

(15 citation statements)

References 56 publications

(64 reference statements)

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“…An approximation of the length scale of a triple junction tubule wall, δ tube , as a function of melt fraction is derived in Appendix and is consistent with these measurements. As illustrated in Figures d and e, δ tube values for very small melt fractions are still significantly larger than the thickness of a typical grain boundary

δ_{g . b .}

, of 1 nm [e.g., Hiraga et al ., ]. However, these tubules are well below the resolution of current X‐ray tomography of

\approx 0.7 μ m

, as utilized to image connectivity in experimental samples as in Zhu et al .…”

Section: What Is the Effect Of Melt On Viscosity?mentioning

confidence: 99%

“…Impurities and defects affect the relative diffusivities in the melt, lattice, and grain boundaries. It is known that grain boundaries incorporate a higher concentration of trace and incompatible elements than do lattices [e.g., Hiraga and Kohlstedt , ; Hiraga et al ., ], increasing the grain boundary diffusivity with increasing impurity content. Dissociated water (i.e., H + +OH − ) may also concentrate along the grain boundary [ Hiraga et al ., ].…”

Section: What Is the Effect Of Melt On Viscosity?mentioning

confidence: 99%

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Questions on the existence, persistence, and mechanical effects of a very small melt fraction in the asthenosphere

Holtzman

2016

Geochem Geophys Geosyst

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This paper integrates current questions in rock physics on the effects and behavior of very small melt fractions ( ≪1%) in the asthenosphere. In experiment and theory, it has been shown that a very small melt fraction forming a connected network has a large effect on the diffusion creep shear viscosity, as well as in the anelastic behavior. Because small concentrations of volatiles, particularly H2O and CO2, significantly lower the peridotite solidus, a small melt fraction is expected in the asthenosphere. Even with connected networks, permeability will be low and surface tension will generate a strong force resisting complete draining of small melt fractions. The anelastic reduction of shear velocity due to melt could cause a ≥5% shear velocity contrast across the solidus, consistent with the contrast measured on features in the shallow suboceanic upper mantle that are often interpreted as the lithosphere‐asthenosphere boundary.

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δ_{g . b .}

, of 1 nm [e.g., Hiraga et al ., ]. However, these tubules are well below the resolution of current X‐ray tomography of

\approx 0.7 μ m

, as utilized to image connectivity in experimental samples as in Zhu et al .…”

Section: What Is the Effect Of Melt On Viscosity?mentioning

confidence: 99%

Section: What Is the Effect Of Melt On Viscosity?mentioning

confidence: 99%

Questions on the existence, persistence, and mechanical effects of a very small melt fraction in the asthenosphere

Holtzman

2016

Geochem Geophys Geosyst

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“…10). For sample Ilc‐1, highly incompatible elements in the intergranular component contribute to the trace element composition of the whole rock resulting from interface segregation of the trace elements, as predicted by Hiraga et al. (2004, 2007).…”

Section: Discussionmentioning

confidence: 87%

“…Wirth (1996) observed 1 to 2‐nm‐thick intergranular amorphous films in some mantle xenoliths using high‐resolution transmission electron microscopy (HRTEM). Hiraga et al. (2007) reported that segregation of incompatible elements at grain interfaces leads to the formation of an interface segregation region with thickness of 0.7 to 0.8 nm in some polycrystalline oxides based on analyses using HRTEM.…”

Section: Discussionmentioning

confidence: 99%

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Intergranular trace elements in mantle xenoliths from Russian Far East: Example for mantle metasomatism by hydrous melt

Yamamoto¹,

Nakai²,

Nishimura³

et al. 2009

Island Arc

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Based on both major and trace element chemistry, the occurrence of the intergranular component in mantle-derived xenoliths from far eastern Russia has been constrained. Whole-rock trace element measurements of one xenolith show apparent negative anomalies in Ce, Th, and high field strength elements on normalized trace element patterns. The trace element pattern of the whole rock differs from those of constituent minerals, indicating that the anomalies in the whole rock are attributable to the presence of an intergranular component. That assumption was confirmed using in situ analysis of trace elements in the intergranular substance and melt inclusion using laser ablation inductively coupled plasma-mass spectrometry. Both the intergranular component and the melt inclusions have identical trace element patterns, which mean that these materials are a cognate metasomatizing agent. The anomalies are regarded as mantle metasomatism related to an aqueous fluid. Hydrous minerals were observed on the wall of the melt inclusions using micro-Raman spectroscopy, indicating that the melt inclusions contained a large amount of water. Thus, this study reveals a trace element composition of a hydrous metasomatizing agent in the mantle.

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Noble Gases as Tracers of Mantle Processes and Magmatic Degassing

Moreira

Kurz

2013

Advances in Isotope Geochemistry

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Equilibrium interface segregation in the diopside–forsterite system II: Applications of interface enrichment to mantle geochemistry

Cited by 43 publications

References 56 publications

Questions on the existence, persistence, and mechanical effects of a very small melt fraction in the asthenosphere

Questions on the existence, persistence, and mechanical effects of a very small melt fraction in the asthenosphere

Intergranular trace elements in mantle xenoliths from Russian Far East: Example for mantle metasomatism by hydrous melt

Noble Gases as Tracers of Mantle Processes and Magmatic Degassing

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