Hydrogen and deuterium diffusion in non-stoichiometric spinel

Bromiley, Geoffrey; Brooke, Jen; Kohn, Simon C.

doi:10.1080/08957959.2017.1353091

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…Insignificant H 2 O loss from the inclusions is further suggested by the fact that solid-state diffusion of H + within spinel is also two to three orders of magnitude slower than in olivine 35 , 36 . With the relatively low temperatures recorded in the percolated harzburgites in this study (950–1020 °C, Supplementary Table 10 ) and prevailing in the shallow mantle below the Kamchatka and West Bismarck arcs 25 – 27 , H + diffusivities of ≤ 10 −14 m 2 s −1 are expected in spinel 36 . Only 30 min were inferred for the ascent from the sub-arc mantle of West Bismarck peridotite xenoliths from the same sampling sites as in this study 37 .…”

Section: Discussionmentioning

confidence: 98%

Oxidising agents in sub-arc mantle melts link slab devolatilisation and arc magmas

et al. 2018

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Subduction zone magmas are more oxidised on eruption than those at mid-ocean ridges. This is attributed either to oxidising components, derived from subducted lithosphere (slab) and added to the mantle wedge, or to oxidation processes occurring during magma ascent via differentiation. Here we provide direct evidence for contributions of oxidising slab agents to melts trapped in the sub-arc mantle. Measurements of sulfur (S) valence state in sub-arc mantle peridotites identify sulfate, both as crystalline anhydrite (CaSO4) and dissolved SO42− in spinel-hosted glass (formerly melt) inclusions. Copper-rich sulfide precipitates in the inclusions and increased Fe3+/∑Fe in spinel record a S6+–Fe2+ redox coupling during melt percolation through the sub-arc mantle. Sulfate-rich glass inclusions exhibit high U/Th, Pb/Ce, Sr/Nd and δ34S (+ 7 to + 11‰), indicating the involvement of dehydration products of serpentinised slab rocks in their parental melt sources. These observations provide a link between liberated slab components and oxidised arc magmas.

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Section: Discussionmentioning

confidence: 98%

Oxidising agents in sub-arc mantle melts link slab devolatilisation and arc magmas

et al. 2018

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“…Similar disorganization of the inner structure of olivine has also been observed with Si and Ti point defects, which appear to converge to similar rates of mobility with increasing annealing time at 1073 K (Ferriss et al., 2018). A general skepticism may be expressed for using the Nernst‐Einstein equation to calculate conductivity from experiments of diffusion or self‐diffusion of H in single‐crystal samples, since the defect population and their coupling strength under different chemical conditions can further complicate the diffusion processes and make them dependent on extrinsic defect populations (Bromiley et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

MATE: An Analysis Tool for the Interpretation of Magnetotelluric Models of the Mantle

Özaydın

Selway

2020

Geochem Geophys Geosyst

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Interpretation of electrical conductivity anomalies observed in magnetotelluric models provides an important opportunity to understand the nature of the lithospheric mantle and its dynamics. Over the course of the last two decades, a great number of experimental petrology studies have been carried out which can be utilized to construct electrical conductivity distribution models for a given composition and geotherm. We have developed an open‐source software (MATE, Mantle Analysis Tool for Electromagnetics) with an easy‐to‐use graphical interface that creates such theoretical models. The program is developed in such a way that additional effects and models can be added very easily. To investigate the conductivity distribution of the cratonic mantle, a series of experiments was made. Results indicate that it is of utmost importance to analyze the magnetotelluric models using accurate compositions, water distributions, and geometric models. Hence, using only olivine conductivity models can lead to erroneous interpretations of both conductivity and estimated water content. Analysis of the potential causes for conductive anomalies shows that the upper and lower lithospheric mantle can be interpreted separately with the transition between them at 75–125 km. Conductive anomalies in the upper lithospheric mantle (<1,000 Ωm) are likely to be explained by the existence of well‐connected minor phases associated with metasomatic fluids, whereas in the lower lithospheric mantle, hydration and/or well‐connected minor phases (e.g., phlogopite or amphibole) can explain conductive anomalies.

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“…Rapid, isobaric quenching was achieved by turning off power to the system whilst maintaining run pressures. A fuller description of high-pressure experiments is given in Bromiley et al (2017). Experimental conditions were chosen to mimic near-liquidus experiments in lunar systems, and synthesize mantle phases in equilibrium with high fraction silicate melt (e.g Longhi, 1992).…”

Section: 2mentioning

confidence: 99%

An experimental investigation of F, Cl and H2O mineral-melt partitioning in a reduced, model lunar system

Potts

Bromiley

Brooker

2021

Geochimica et Cosmochimica Acta

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Hydrogen and deuterium diffusion in non-stoichiometric spinel

Cited by 4 publications

References 26 publications

Oxidising agents in sub-arc mantle melts link slab devolatilisation and arc magmas

Oxidising agents in sub-arc mantle melts link slab devolatilisation and arc magmas

MATE: An Analysis Tool for the Interpretation of Magnetotelluric Models of the Mantle

An experimental investigation of F, Cl and H2O mineral-melt partitioning in a reduced, model lunar system

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