Article
Licensed
Unlicensed
Requires Authentication
Letter. Crystal chemistry of sodium in the Earth’s interior: The structure of Na2MgSi5O12 synthesized at 17.5 GPa and 1700 °C
-
Luca Bindi
,
Anna M. Dymshits
Published/Copyright:
April 2, 2015
Abstract
The crystal structure and chemical composition of a crystal of Na2MgSi5O12 garnet synthesized in the model system Mg3Al2Si3O12-Na2MgSi5O12 at 17.5 GPa and 1700 °C have been investigated. Quantitative analysis leads to the following formula: Na1.98Mg1.00Si5.01O12. Na2MgSi5O12 garnet was found to be tetragonal, space group I41/acd, with lattice parameters a = 11.3966(6), c = 11.3369(5) Å, V = 1472.5(1) Å3. The structure was refined to R = 5.13% using 771 independent reflections. Sodium and Mg are disordered at the X sites (with a mean bond distance of 2.308 Å for both the sites), whereas Si is ordered at both the Y (mean: 1.793 Å) and Z sites (means: 1.630 and 1.624 Å). Na-bearing majoritic garnet may be an important potential sodium concentrator in the lower parts of the upper mantle and transition zone. The successful synthesis of the Na2MgSi5O12 end-member and its structural characterization is of key importance because the study of its thermodynamic constants combined with the data of computer modeling provides new constraints on thermobarometry of majorite garnet assemblages
Received: 2010-10-8
Accepted: 2010-10-28
Published Online: 2015-4-2
Published in Print: 2011-2-1
© 2015 by Walter de Gruyter Berlin/Boston
You are currently not able to access this content.
You are currently not able to access this content.
Articles in the same Issue
- Paulscherrerite from the Number 2 Workings, Mount Painter Inlier, Northern Flinders Ranges, South Australia: “Dehydrated schoepite” is a mineral after all
- Atomistic investigation of the pyrophyllitic substitution and implications on clay stability
- Application of the two-feldspar geothermometer to ultrahigh-temperature (UHT) rocks in the Khondalite belt, North China craton and its implications
- Wüstite in a hydrothermal silver-lead-zinc vein, Lucky Friday mine, Coeur d’Alene mining district, U.S.A.
- Gelosaite, BiMo6+(2–5x)Mo5+6xO7(OH)·H2O (0 ≤ x ≤ 0.4), a new mineral from Su Senargiu (CA), Sardinia, Italy, and a second occurrence from Kingsgate, New England, Australia
- Improved electron probe microanalysis of trace elements in quartz
- Ultra-high residual compressive stress (>2 GPa) in a very small volume (<1 μm3) of indented quartz
- Transmission electron microscopy investigation of Ag-free lillianite and heyrovskýite from Vulcano, Aeolian Islands, Italy
- Combined inelastic neutron scattering and solid-state density functional theory study of dynamics of hydrogen atoms in muscovite 2M1
- Contact metamorphism of a Cretaceous accretionary prism by the 14 Ma Okueyama granite, a single post-kinematic pluton in Central Kyushu, Japan: SVD analysis of metamorphic reactions and thermal release
- Origin of crosscutting dissolution surfaces in magmatic plagioclase
- Néel transition in (Mg,Fe)O: A possible change of magnetic structure
- Extreme channelization of fluid and the problem of element mobility during Barrovian metamorphism
- The high-temperature P21/m → C2/m phase transitions in synthetic amphiboles along the richterite–(BMg)–richterite join
- The crystal structure of barite, BaSO4, at high pressure
- Thermal decomposition of brushite, CaHPO4·2H2O to monetite CaHPO4 and the formation of an amorphous phase
- Rhombic-shaped nanodomains in columbite driven by contrasting cation order
- High-pressure structural evolution and equation of state of analbite
- In-situ dehydration studies of fully K-, Rb-, and Cs-exchanged natrolites
- The crystal structures and Raman spectra of aravaipaite and calcioaravaipaite
- Temperature dependence of the Fe2+ Mössbauer parameters in triphylite (LiFePO4)
- Synthesis and characterization of françoisite-(Nd): Nd[(UO2)3O(OH)(PO4)2]·6H2O
- Fluorphosphohedyphane, Ca2Pb3(PO4)3F, the first apatite supergroup mineral with essential Pb and F
- A new mineral with an olivine structure and pyroxene composition in the shock-induced melt veins of Tenham L6 chondrite
- The WURM project—a freely available web-based repository of computed physical data for minerals
- Acid production by FeSO4·nH2O dissolution: Comment
- Letter. Crystal chemistry of sodium in the Earth’s interior: The structure of Na2MgSi5O12 synthesized at 17.5 GPa and 1700 °C
- Letter. In-situ infrared spectra of OH in olivine to 1100°C
Keywords for this article
Garnets;
sodium;
majorite;
crystal structure;
microprobe analysis;
synthesis
Articles in the same Issue
- Paulscherrerite from the Number 2 Workings, Mount Painter Inlier, Northern Flinders Ranges, South Australia: “Dehydrated schoepite” is a mineral after all
- Atomistic investigation of the pyrophyllitic substitution and implications on clay stability
- Application of the two-feldspar geothermometer to ultrahigh-temperature (UHT) rocks in the Khondalite belt, North China craton and its implications
- Wüstite in a hydrothermal silver-lead-zinc vein, Lucky Friday mine, Coeur d’Alene mining district, U.S.A.
- Gelosaite, BiMo6+(2–5x)Mo5+6xO7(OH)·H2O (0 ≤ x ≤ 0.4), a new mineral from Su Senargiu (CA), Sardinia, Italy, and a second occurrence from Kingsgate, New England, Australia
- Improved electron probe microanalysis of trace elements in quartz
- Ultra-high residual compressive stress (>2 GPa) in a very small volume (<1 μm3) of indented quartz
- Transmission electron microscopy investigation of Ag-free lillianite and heyrovskýite from Vulcano, Aeolian Islands, Italy
- Combined inelastic neutron scattering and solid-state density functional theory study of dynamics of hydrogen atoms in muscovite 2M1
- Contact metamorphism of a Cretaceous accretionary prism by the 14 Ma Okueyama granite, a single post-kinematic pluton in Central Kyushu, Japan: SVD analysis of metamorphic reactions and thermal release
- Origin of crosscutting dissolution surfaces in magmatic plagioclase
- Néel transition in (Mg,Fe)O: A possible change of magnetic structure
- Extreme channelization of fluid and the problem of element mobility during Barrovian metamorphism
- The high-temperature P21/m → C2/m phase transitions in synthetic amphiboles along the richterite–(BMg)–richterite join
- The crystal structure of barite, BaSO4, at high pressure
- Thermal decomposition of brushite, CaHPO4·2H2O to monetite CaHPO4 and the formation of an amorphous phase
- Rhombic-shaped nanodomains in columbite driven by contrasting cation order
- High-pressure structural evolution and equation of state of analbite
- In-situ dehydration studies of fully K-, Rb-, and Cs-exchanged natrolites
- The crystal structures and Raman spectra of aravaipaite and calcioaravaipaite
- Temperature dependence of the Fe2+ Mössbauer parameters in triphylite (LiFePO4)
- Synthesis and characterization of françoisite-(Nd): Nd[(UO2)3O(OH)(PO4)2]·6H2O
- Fluorphosphohedyphane, Ca2Pb3(PO4)3F, the first apatite supergroup mineral with essential Pb and F
- A new mineral with an olivine structure and pyroxene composition in the shock-induced melt veins of Tenham L6 chondrite
- The WURM project—a freely available web-based repository of computed physical data for minerals
- Acid production by FeSO4·nH2O dissolution: Comment
- Letter. Crystal chemistry of sodium in the Earth’s interior: The structure of Na2MgSi5O12 synthesized at 17.5 GPa and 1700 °C
- Letter. In-situ infrared spectra of OH in olivine to 1100°C
