Article
Licensed
Unlicensed
Requires Authentication
Electron energy-loss spectroscopy of silicate perovskite-magnesiowüstite high-pressure assemblages
-
Alexandre Gloter
,
Isabelle Martinez
Published/Copyright:
March 25, 2015
Abstract
Silicate perovskite-magnesiowüstite assemblages synthesized from natural olivine in the multianvil press and diamond-anvil cell were studied by electron energy-loss spectroscopy (EELS). Spectra of crystalline silicate perovskite, and its post-amorphization phase, as well as magnesiowüstite were collected at the Fe and Si L2,3 edge, and in the low loss (<50 eV) domain. The technique of line spectra ensuring very low beam doses allows good quality spectra to be collected from crystalline perovskite prior to amorphization and permits characterization of coexisting crystals of perovskite and magnesiowüstite. Spectra at the Si L2,3 edge show that the beam-induced amorphization of silicate perovskite is accompanied by a change from sixfold to fourfold oxygen coordination of silicon atoms. Spectra at the Fe L2,3 edge show that Fe2+ is the major form of Fe in olivine, ringwoodite, and magnesiowüstite, whereas Fe3+ is dominant in crystalline silicate perovskite and its amorphization products. In magnesiowüstite and silicate perovskite observed in contact in these samples, Fe3+ is strongly partitioned into the silicate phase.
Careful experimental substraction of zero-loss peak by off Bragg acquisition of electron energyloss spectra allows good quality low loss spectra to be collected from crystalline silicate perovskite and magnesiowüstite. In magnesiowüstite, interband transitions are well characterized, leading to a measured gap of 7.8 eV, in agreement with previous theoretical calculations. Interband transitions at 10 eV and 12.5 eV are also well resolved in crystalline silicate perovskite, leading to a gap of about 9.5 eV.
Received: 1999-10-25
Accepted: 2000-5-2
Published Online: 2015-3-25
Published in Print: 2000-10-1
© 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
- Nucleation and growth kinetics of analcime from precursor Na-clinoptilolite
- Viscosities of granitic (sensu lato) melts: Influence of the anorthite component
- Geochemistry of pyroxene inclusions from the Warrumbungle Volcano, New South Wales, Australia
- Supersilicic clinopyroxene and silica exsolution in UHPM eclogite and pelitic gneiss from the Kokchetav massif, Kazakhstan
- Experimental study of intracrystalline Fe2+-Mg exchange in three augite crystals: Effect of composition on geothermometric calibration
- Transmission electron microscopy and differential thermal studies of lazurite polymorphs
- Re-equilibration of glass and CO2 inclusions in xenolith olivine: A TEM study
- Origin and structural character of haüyness in spinel dunite xenoliths from La Palma, Canary Islands
- Pyrrhotite varieties from the 9.1 km deep borehole of the KTB project
- Mineralogy and magnetic behavior of pyrrhotite from a 260 °C section at the KTB drilling site, Germany
- Surface defects and self-diffusion on pyrite {100}: An ultra-high vacuum scanning tunneling microscopy and theoretical modeling study
- Rare-earth elements in chlorapatite [Ca10(PO4)6Cl2]: Uptake, site preference, and degradation of monoclinic structure
- Thermal pressure in MgO and MgSiO3 perovskite at lower mantle conditions
- Electron energy-loss spectroscopy of silicate perovskite-magnesiowüstite high-pressure assemblages
- Magnesium coordination environments in glasses and minerals: New insight from high-field magnesium-25 MAS NMR
- In situ powder diffraction study of titanite (CaTiOSiO4) at high pressure and high temperature
- Surinamite: A high-temperature metamorphic beryllosilicate from Lewisian sapphirine-bearing kyanite-orthopyroxene-quartz-potassium feldspar gneiss at South Harris, N.W. Scotland
- Single-crystal X-ray diffraction study of FeGeO3 high-P clinopyroxene (C2/c) up to 8.2 GPa
- High-pressure Ca4Al6O13: An example of a calcium aluminate with three different types of coordination polyhedra for aluminum
- Cation distribution in synthetic zinc ferrite (Zn0.97Fe2.02O4) from in situ high-temperature neutron powder diffraction
- Infrared study of OH sites in tourmaline from the elbaite-schorl series
- Second occurrence of okayamalite, Ca2SiB2O7: chemical and TEM characterization
- Rietveld refinement of okayamalite, Ca2SiB2O7: Structural evidence for the B/Si ordered distribution
- Tumchaite Na2(Zr,Sn)Si4O11·2H2O—A new mineral from carbonatites of the Vuoriyarvi alkali-ultrabasic massif, Murmansk Region, Russia
- The crystal structure of thornasite, Na12Th3[Si8O19]4(H2O)18: A novel interrupted silicate framework
- Symesite, Pb10(SO4)O7Cl4(H2O), a new PbO-related sheet mineral: Description and crystal structure
- Na2Ca2(P2O7)F2, the first diphosphate of the cuspidine family
- Amphibole asbestos from Libby, Montana: Aspects of nomenclature
- Thermodynamics of multicomponent olivines and the solution properties of (Ni,Mg,Fe)2SiO4 and (Ca,Mg,Fe)2SiO4 olivines—Comment
- Thermodynamics of multicomponent olivines and the solution properties of (Ni,Mg,Fe)2SiO4 and (Ca,Mg,Fe)2SiO4 olivine—Reply
- Letter. Fivefold-coordinated aluminum in tectosilicate glasses observed by triple quantum MAS NMR
Articles in the same Issue
- Nucleation and growth kinetics of analcime from precursor Na-clinoptilolite
- Viscosities of granitic (sensu lato) melts: Influence of the anorthite component
- Geochemistry of pyroxene inclusions from the Warrumbungle Volcano, New South Wales, Australia
- Supersilicic clinopyroxene and silica exsolution in UHPM eclogite and pelitic gneiss from the Kokchetav massif, Kazakhstan
- Experimental study of intracrystalline Fe2+-Mg exchange in three augite crystals: Effect of composition on geothermometric calibration
- Transmission electron microscopy and differential thermal studies of lazurite polymorphs
- Re-equilibration of glass and CO2 inclusions in xenolith olivine: A TEM study
- Origin and structural character of haüyness in spinel dunite xenoliths from La Palma, Canary Islands
- Pyrrhotite varieties from the 9.1 km deep borehole of the KTB project
- Mineralogy and magnetic behavior of pyrrhotite from a 260 °C section at the KTB drilling site, Germany
- Surface defects and self-diffusion on pyrite {100}: An ultra-high vacuum scanning tunneling microscopy and theoretical modeling study
- Rare-earth elements in chlorapatite [Ca10(PO4)6Cl2]: Uptake, site preference, and degradation of monoclinic structure
- Thermal pressure in MgO and MgSiO3 perovskite at lower mantle conditions
- Electron energy-loss spectroscopy of silicate perovskite-magnesiowüstite high-pressure assemblages
- Magnesium coordination environments in glasses and minerals: New insight from high-field magnesium-25 MAS NMR
- In situ powder diffraction study of titanite (CaTiOSiO4) at high pressure and high temperature
- Surinamite: A high-temperature metamorphic beryllosilicate from Lewisian sapphirine-bearing kyanite-orthopyroxene-quartz-potassium feldspar gneiss at South Harris, N.W. Scotland
- Single-crystal X-ray diffraction study of FeGeO3 high-P clinopyroxene (C2/c) up to 8.2 GPa
- High-pressure Ca4Al6O13: An example of a calcium aluminate with three different types of coordination polyhedra for aluminum
- Cation distribution in synthetic zinc ferrite (Zn0.97Fe2.02O4) from in situ high-temperature neutron powder diffraction
- Infrared study of OH sites in tourmaline from the elbaite-schorl series
- Second occurrence of okayamalite, Ca2SiB2O7: chemical and TEM characterization
- Rietveld refinement of okayamalite, Ca2SiB2O7: Structural evidence for the B/Si ordered distribution
- Tumchaite Na2(Zr,Sn)Si4O11·2H2O—A new mineral from carbonatites of the Vuoriyarvi alkali-ultrabasic massif, Murmansk Region, Russia
- The crystal structure of thornasite, Na12Th3[Si8O19]4(H2O)18: A novel interrupted silicate framework
- Symesite, Pb10(SO4)O7Cl4(H2O), a new PbO-related sheet mineral: Description and crystal structure
- Na2Ca2(P2O7)F2, the first diphosphate of the cuspidine family
- Amphibole asbestos from Libby, Montana: Aspects of nomenclature
- Thermodynamics of multicomponent olivines and the solution properties of (Ni,Mg,Fe)2SiO4 and (Ca,Mg,Fe)2SiO4 olivines—Comment
- Thermodynamics of multicomponent olivines and the solution properties of (Ni,Mg,Fe)2SiO4 and (Ca,Mg,Fe)2SiO4 olivine—Reply
- Letter. Fivefold-coordinated aluminum in tectosilicate glasses observed by triple quantum MAS NMR
