Water solubility in orthopyroxene: Dependence on temperature and Al content

Zhang, Baohua; Matsuzaki, Takashi; Wu, Xiaoping

doi:10.1007/s11434-013-5953-5

Cited by 4 publications

(2 citation statements)

References 44 publications

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“…Experiments have shown that the water incorporation in pyroxene also depends on P-T conditions [Rauch and Keppler, 2002;Mierdel and Keppler, 2004;Mierdel et al, 2007;F erot and Bolfan-Casanova, 2012;Zhang et al, 2013] and water activity [Stalder et al, 2008]. In addition, oxygen fugacity is also believed to control the incorporation of water in mantle peridotite NAMs [Peslier et al, 2002;Peslier, 2010;Yu et al, 2011].…”

Section: 1002/2016gc006767mentioning

confidence: 99%

Origins of water content variations in the suboceanic upper mantle: Insight from Southwest Indian Ridge abyssal peridotites

Li¹,

Soustelle

Zhang

et al. 2017

Geochem Geophys Geosyst

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To investigate the origin of heterogeneous water distribution in the suboceanic lithospheric mantle, we performed a detailed petrological and geochemical analysis of abyssal peridotites collected from two localities (53°E and 63.5°E) on the Southwest Indian Ridge. These serpentinized peridotites display primary olivine‐orthopyroxene‐clinopyroxene‐spinel assemblage and record equilibrium temperature of 1150–1200°C and around 1000°C for the 53°E and 63.5°E locations, respectively. The rocks were thus equilibrated in the spinel stability field prior to their exhumation to the seafloor. Our FTIR analyses show variable water contents in orthopyroxene ranging from 24 to 262 wt ppm H2O. Orthopyroxene in the 63.5°E peridotites is characterized by homogeneous and high water content (>200 ppm), whereas orthopyroxene in the 53°E peridotites displays a wider range of water contents (24–246 ppm). We first demonstrate that differences in equilibrium conditions (i.e., pressure and temperature) and mineral chemistry and serpentinization cannot explain the water content variations. Melting modeling show that a fractional melting in both garnet and spinel stability fields is needed to explain the MREE and HREE concentrations in clinopyroxene. Enrichment in LREE, high water contents, and high H2O/Ce, however, require a postmelting rehydration event such as metasomatism. Based on petrographic evidence and investigation of chemical heterogeneities at segment/dredge scale, we suggest that this event involves a metasomatic agent enriched in water and incompatible elements. We infer that the small‐scale heterogeneities in water and trace elements may result either from successive infiltration of various amounts of melt/fluids as described in the formation of oceanic core complex or from spatial heterogeneities of melt infiltration as observed in peridotite massifs.

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Section: 1002/2016gc006767mentioning

confidence: 99%

Origins of water content variations in the suboceanic upper mantle: Insight from Southwest Indian Ridge abyssal peridotites

Li¹,

Soustelle

Zhang

et al. 2017

Geochem Geophys Geosyst

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“…2) At room temperature, the tensile strength of AZ91D with Gd is increased by 22% and the elongation can be increased by 32%; at high temperature, the tensile strength and elongation could enhance 17% and 25%, respectively. 3) The optimum performance of Mg alloys was obtained when the content of Gd is 2 wt.%, 4) The fracture type of AZ91D magnesium alloy is brittle fracture.…”

Section: Discussionmentioning

confidence: 94%

Effect of rare earth element Gd on the mechanical Properties of AZ91D alloy

Xiang¹,

Liang²,

Liu³

et al. 2015

Proceedings of the 3rd International Conference on Material, Mechanical and Manufacturing Engineering

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The magnesium alloys with rare earth element Gd were prepared by induction melting furnace. Influences of Gd on the microstructure and mechanical properties of AZ91D were investigated. The results showed that addition of Gd to AZ91D alloy could refine the microstructure including primary α-Mg phase and eutectic β-Mg 17 Al 12 . The tensile properties were improved greatly with addition of Gd to AZ91D both at room temperature and elevated temperature. It was found that the excellent mechanical properties were obtained when the Gd content was 2 wt.%. Inaddition, the fracture morphologies indicated that the AZ91D has the characteristics of a brittle fracture.

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Unravelling the incorporation mechanisms of water in aluminous orthoenstatite: II. comprehensive 1H, 29Si and 27Al NMR measurements

Xue,

Kanzaki,

Yin

2024

Contrib Mineral Petrol

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Aluminum has been shown to significantly enhance the water incorporation capacity of orthoenstatite (OEn), but the incorporation mechanisms remained to be clarified. We performed a comprehensive one- and two-dimensional 1H, 29Si and 27Al NMR study on four hydrous aluminous OEn samples containing 1–8 wt% Al2O3 synthesized at 1.5 GPa and 900 °C to clarify the issue. The combined 1H MAS and static (non-spinning) NMR, 1H double-quantum and triple-quantum MAS NMR, and 27Al→1H CP MAS NMR and HETCOR results, in particular, unambiguously revealed that a large part of the incorporated water are present as proton pairs in Mg vacancies adjacent to Al, with one proton of each pair for the dominant proton pairs exhibiting significantly weaker hydrogen bonding than those in Al-free OEn. Proton pairs in Mg vacancies remote from Al are minor or absent for samples with 4–8 wt% Al2O3, and more abundant for a sample with 1 wt% Al2O3. Isolated protons due to coupled substitutions of Al + H for 1Si and 2Mg (both with weak hydrogen bonding) were also detected, but are less abundant than hitherto considered. The observed NMR peaks match well with those predicted for the corresponding OH defect models from our first-principles calculations. Thus, the enhancement of water solubility by Al for OEn are due to not only coupled substitutions of Al + H for 1Si and 2Mg, but also interactions of Al with proton pairs in Mg vacancies. These mechanisms may also be important in other nominally anhydrous aluminous silicate minerals.

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Water solubility in orthopyroxene: Dependence on temperature and Al content

Cited by 4 publications

References 44 publications

Origins of water content variations in the suboceanic upper mantle: Insight from Southwest Indian Ridge abyssal peridotites

Origins of water content variations in the suboceanic upper mantle: Insight from Southwest Indian Ridge abyssal peridotites

Effect of rare earth element Gd on the mechanical Properties of AZ91D alloy

Unravelling the incorporation mechanisms of water in aluminous orthoenstatite: II. comprehensive 1H, 29Si and 27Al NMR measurements

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