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Elastic wave velocity anomalies of anorthite in a subducting plate: In situ experiments
-
Kyoko N. Matsukage
,
Yu Nishihara
Veröffentlicht/Copyright:
12. August 2015
Abstract
To understand the origin of observed low velocities in the crustal portion of subducting plates, we performed in situ measurements of elastic wave velocities of anorthite at temperatures up to 1373 K at pressure of ~1 GPa and up to 773 K at 2.0-7.0 GPa. A fine-grained polycrystalline anorthite, which was synthesized using a gas pressure apparatus, was used for the measurements. The high-pressure experiments were performed using the multi-anvil apparatus installed on beamline BL04B1 at SPring-8. The elastic wave velocity was measured by the ultrasonic pulse method with synchrotron X‑ray radiographic imaging and X‑ray diffraction techniques. At ~1.0 GPa, elastic wave velocities exhibited a sharp temperature-induced kink at ~500 K. Below 500 K, the elastic wave velocities decrease with increasing temperature. In contrast, above 500 K, the elastic wave velocities show an increasing trend in the range of 500-900 K, and then revert back to a decreasing trend at above 900 K. We also found a pressure-induced velocity anomaly of anorthite. At 300-373 K, νP is constant up to 4 GPa, but decrease above 4 GPa with increasing pressure, while νS decreases monotonously with increasing pressure. These elastic anomalies are considered to be attributable to the tilting behavior of the corner-sharing TO4 (T = Al, Si) tetrahedra in three-dimensional frameworks of anorthite. Our results suggest the presence of plagioclase feldspar has the potential to causes low-velocity anomaly in the subducting oceanic crust when it survives as a metastable phase in the slab at higher pressure and lower temperature conditions.
Received: 2014-11-3
Accepted: 2015-2-3
Published Online: 2015-8-12
Published in Print: 2015-8-1
© 2015 by Walter de Gruyter Berlin/Boston
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- Beyond the equilibrium paradigm: How consideration of kinetics enhances metamorphic interpretation
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- Degassing pathways of Cl-, F-, H-, and S-bearing magmas near the lunar surface: Implications for the composition and Cl isotopic values of lunar apatite
- Uranium scavenging during mineral replacement reactions
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- Formation of rhyolite at the Okataina Volcanic Complex, New Zealand: New insights from analysis of quartz clusters in plutonic lithics
- Experimental investigation of F, Cl, and OH partitioning between apatite and Fe-rich basaltic melt at 1.0–1.2 GPa and 950–1000 °C
- Synthesis, characterization, and thermodynamics of arsenates forming in the Ca-Fe(III)-As(V)-NO3 system: Implications for the stability of Ca-Fe arsenates
- High-pressure phases of cordierite from single-crystal X-ray diffraction to 15 GPa
- Planar microstructures in zircon from paleo-seismic zones
- Ultra-deep subduction of Yematan eclogite in the North Qaidam UHP belt, NW China: Evidence from phengite exsolution in omphacite
- Elastic wave velocity anomalies of anorthite in a subducting plate: In situ experiments
- Current limitations of molecular dynamic simulations as probes of thermo-physical behavior of silicate melts
- Three-component mixed-layer illite/smectite/kaolinite (I/S/K) minerals in hydromorphic soils, south China
- Melting curve of NaCl to 20 GPa from electrical measurements of capacitive current
- Grain size measurement from two-dimensional micro-X-ray diffraction: Laboratory application of a radial integration technique
- Decrease of hydrogen incorporation in forsterite from CO2-H2O-rich kimberlitic liquid
- Provenance determination of sapphires and rubies using laser-induced breakdown spectroscopy and multivariate analysis
- Structural insights and elasticity of single-crystal antigorite from high-pressure Raman and Brillouin spectroscopy measured in the (010) plane
- Magnetic anisotropy in natural amphibole crystals
- Resolving oxygen isotopic disturbance in zircon: A case study from the low δ18O Scourie dikes, NW Scotland
- Accurate determination of Fe3+/ΣFe of andesitic glass by Mössbauer spectroscopy
- Recoil-free fractions of iron in aluminous bridgmanite from temperature-dependent Mössbauer spectra
- Chemical interactions between a sedimentary diapir and surrounding magma: Evidence from the Phepane Dome and Bushveld Complex, South Africa
- The crystal structures of Mg2Fe2C4O13, with tetrahedrally coordinated carbon, and Fe13O19, synthesized at deep mantle conditions
- New Mineral Names
- Book Review: Geodynamics, Third edition.
Schlagwörter für diesen Artikel
Anorthite;
plagioclase;
elastic wave velocities;
subduction;
oceanic crust
Artikel in diesem Heft
- Data, ideas, and the nature of scientific progress
- Beyond the equilibrium paradigm: How consideration of kinetics enhances metamorphic interpretation
- Magmatic volatiles (H, C, N, F, S, Cl) in the lunar mantle, crust, and regolith: Abundances, distributions, processes, and reservoirs
- The mafic component of the lunar crust: Constraints on the crustal abundance of mantle and intrusive rock, and the mineralogy of lunar anorthosites
- Degassing pathways of Cl-, F-, H-, and S-bearing magmas near the lunar surface: Implications for the composition and Cl isotopic values of lunar apatite
- Uranium scavenging during mineral replacement reactions
- New structure of high-pressure body-centered orthorhombic Fe2SiO4
- Spectroscopic study of ordering in non-stoichiometric magnesium aluminate spinel
- High-pressure behavior of cuprospinel CuFe2O4: Influence of the Jahn-Teller effect on the spinel structure
- Field and model constraints on silicic melt segregation by compaction/hindered settling: The role of water and its effect on latent heat release
- Formation of rhyolite at the Okataina Volcanic Complex, New Zealand: New insights from analysis of quartz clusters in plutonic lithics
- Experimental investigation of F, Cl, and OH partitioning between apatite and Fe-rich basaltic melt at 1.0–1.2 GPa and 950–1000 °C
- Synthesis, characterization, and thermodynamics of arsenates forming in the Ca-Fe(III)-As(V)-NO3 system: Implications for the stability of Ca-Fe arsenates
- High-pressure phases of cordierite from single-crystal X-ray diffraction to 15 GPa
- Planar microstructures in zircon from paleo-seismic zones
- Ultra-deep subduction of Yematan eclogite in the North Qaidam UHP belt, NW China: Evidence from phengite exsolution in omphacite
- Elastic wave velocity anomalies of anorthite in a subducting plate: In situ experiments
- Current limitations of molecular dynamic simulations as probes of thermo-physical behavior of silicate melts
- Three-component mixed-layer illite/smectite/kaolinite (I/S/K) minerals in hydromorphic soils, south China
- Melting curve of NaCl to 20 GPa from electrical measurements of capacitive current
- Grain size measurement from two-dimensional micro-X-ray diffraction: Laboratory application of a radial integration technique
- Decrease of hydrogen incorporation in forsterite from CO2-H2O-rich kimberlitic liquid
- Provenance determination of sapphires and rubies using laser-induced breakdown spectroscopy and multivariate analysis
- Structural insights and elasticity of single-crystal antigorite from high-pressure Raman and Brillouin spectroscopy measured in the (010) plane
- Magnetic anisotropy in natural amphibole crystals
- Resolving oxygen isotopic disturbance in zircon: A case study from the low δ18O Scourie dikes, NW Scotland
- Accurate determination of Fe3+/ΣFe of andesitic glass by Mössbauer spectroscopy
- Recoil-free fractions of iron in aluminous bridgmanite from temperature-dependent Mössbauer spectra
- Chemical interactions between a sedimentary diapir and surrounding magma: Evidence from the Phepane Dome and Bushveld Complex, South Africa
- The crystal structures of Mg2Fe2C4O13, with tetrahedrally coordinated carbon, and Fe13O19, synthesized at deep mantle conditions
- New Mineral Names
- Book Review: Geodynamics, Third edition.
