Home Physical Sciences Ultra-deep subduction of Yematan eclogite in the North Qaidam UHP belt, NW China: Evidence from phengite exsolution in omphacite
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Ultra-deep subduction of Yematan eclogite in the North Qaidam UHP belt, NW China: Evidence from phengite exsolution in omphacite

  • Lei Han EMAIL logo , Lifei Zhang and Guibin Zhang
Published/Copyright: August 12, 2015
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American Mineralogist
From the journal American Mineralogist Volume 100 Issue 8-9

Abstract

Phengite exsolution in omphacite from the Yematan eclogite, North Qaidam UHP belt, NW China, is described. Mineralogical investigations show that the precursor omphacite in the Yematan eclogite contains up to 1.16 wt% K2O and ~10 000 ppm H2O. Experimental studies document this omphacite to be formed at pressures higher than 6 GPa (at 900 °C). The pressure-temperature conditions of 3.68 GPa and 892 °C for phengite exsolution in omphacite associated with garnet during the exhumation were obtained by using Grt-Omp-Ph geothermobarometer. We conclude that omphacitic-clinopyroxene in subducted eclogites may act as a robust medium to transport H2O and potassium deep into the interior of the Earth. This study suggests that the Yematan eclogite in North Qaidam UHP metamorphic belt, NW China, may have been subducted and exhumed from depths of more than 200 km.

Keywords: Phengite exsolution; eclogite; ultra-deep subduction; North Qaidam; China
Received: 2014-1-22
Accepted: 2015-3-3
Published Online: 2015-8-12
Published in Print: 2015-8-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Data, ideas, and the nature of scientific progress
  2. Beyond the equilibrium paradigm: How consideration of kinetics enhances metamorphic interpretation
  3. Magmatic volatiles (H, C, N, F, S, Cl) in the lunar mantle, crust, and regolith: Abundances, distributions, processes, and reservoirs
  4. The mafic component of the lunar crust: Constraints on the crustal abundance of mantle and intrusive rock, and the mineralogy of lunar anorthosites
  5. 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
  6. Uranium scavenging during mineral replacement reactions
  7. New structure of high-pressure body-centered orthorhombic Fe2SiO4
  8. Spectroscopic study of ordering in non-stoichiometric magnesium aluminate spinel
  9. High-pressure behavior of cuprospinel CuFe2O4: Influence of the Jahn-Teller effect on the spinel structure
  10. Field and model constraints on silicic melt segregation by compaction/hindered settling: The role of water and its effect on latent heat release
  11. Formation of rhyolite at the Okataina Volcanic Complex, New Zealand: New insights from analysis of quartz clusters in plutonic lithics
  12. 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
  13. Synthesis, characterization, and thermodynamics of arsenates forming in the Ca-Fe(III)-As(V)-NO3 system: Implications for the stability of Ca-Fe arsenates
  14. High-pressure phases of cordierite from single-crystal X-ray diffraction to 15 GPa
  15. Planar microstructures in zircon from paleo-seismic zones
  16. Ultra-deep subduction of Yematan eclogite in the North Qaidam UHP belt, NW China: Evidence from phengite exsolution in omphacite
  17. Elastic wave velocity anomalies of anorthite in a subducting plate: In situ experiments
  18. Current limitations of molecular dynamic simulations as probes of thermo-physical behavior of silicate melts
  19. Three-component mixed-layer illite/smectite/kaolinite (I/S/K) minerals in hydromorphic soils, south China
  20. Melting curve of NaCl to 20 GPa from electrical measurements of capacitive current
  21. Grain size measurement from two-dimensional micro-X-ray diffraction: Laboratory application of a radial integration technique
  22. Decrease of hydrogen incorporation in forsterite from CO2-H2O-rich kimberlitic liquid
  23. Provenance determination of sapphires and rubies using laser-induced breakdown spectroscopy and multivariate analysis
  24. Structural insights and elasticity of single-crystal antigorite from high-pressure Raman and Brillouin spectroscopy measured in the (010) plane
  25. Magnetic anisotropy in natural amphibole crystals
  26. Resolving oxygen isotopic disturbance in zircon: A case study from the low δ18O Scourie dikes, NW Scotland
  27. Accurate determination of Fe3+/ΣFe of andesitic glass by Mössbauer spectroscopy
  28. Recoil-free fractions of iron in aluminous bridgmanite from temperature-dependent Mössbauer spectra
  29. Chemical interactions between a sedimentary diapir and surrounding magma: Evidence from the Phepane Dome and Bushveld Complex, South Africa
  30. The crystal structures of Mg2Fe2C4O13, with tetrahedrally coordinated carbon, and Fe13O19, synthesized at deep mantle conditions
  31. New Mineral Names
  32. Book Review: Geodynamics, Third edition.
https://doi.org/10.2138/am-2015-4899
Keywords for this article
Phengite exsolution; eclogite; ultra-deep subduction; North Qaidam; China

Articles in the same Issue

  1. Data, ideas, and the nature of scientific progress
  2. Beyond the equilibrium paradigm: How consideration of kinetics enhances metamorphic interpretation
  3. Magmatic volatiles (H, C, N, F, S, Cl) in the lunar mantle, crust, and regolith: Abundances, distributions, processes, and reservoirs
  4. The mafic component of the lunar crust: Constraints on the crustal abundance of mantle and intrusive rock, and the mineralogy of lunar anorthosites
  5. 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
  6. Uranium scavenging during mineral replacement reactions
  7. New structure of high-pressure body-centered orthorhombic Fe2SiO4
  8. Spectroscopic study of ordering in non-stoichiometric magnesium aluminate spinel
  9. High-pressure behavior of cuprospinel CuFe2O4: Influence of the Jahn-Teller effect on the spinel structure
  10. Field and model constraints on silicic melt segregation by compaction/hindered settling: The role of water and its effect on latent heat release
  11. Formation of rhyolite at the Okataina Volcanic Complex, New Zealand: New insights from analysis of quartz clusters in plutonic lithics
  12. 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
  13. Synthesis, characterization, and thermodynamics of arsenates forming in the Ca-Fe(III)-As(V)-NO3 system: Implications for the stability of Ca-Fe arsenates
  14. High-pressure phases of cordierite from single-crystal X-ray diffraction to 15 GPa
  15. Planar microstructures in zircon from paleo-seismic zones
  16. Ultra-deep subduction of Yematan eclogite in the North Qaidam UHP belt, NW China: Evidence from phengite exsolution in omphacite
  17. Elastic wave velocity anomalies of anorthite in a subducting plate: In situ experiments
  18. Current limitations of molecular dynamic simulations as probes of thermo-physical behavior of silicate melts
  19. Three-component mixed-layer illite/smectite/kaolinite (I/S/K) minerals in hydromorphic soils, south China
  20. Melting curve of NaCl to 20 GPa from electrical measurements of capacitive current
  21. Grain size measurement from two-dimensional micro-X-ray diffraction: Laboratory application of a radial integration technique
  22. Decrease of hydrogen incorporation in forsterite from CO2-H2O-rich kimberlitic liquid
  23. Provenance determination of sapphires and rubies using laser-induced breakdown spectroscopy and multivariate analysis
  24. Structural insights and elasticity of single-crystal antigorite from high-pressure Raman and Brillouin spectroscopy measured in the (010) plane
  25. Magnetic anisotropy in natural amphibole crystals
  26. Resolving oxygen isotopic disturbance in zircon: A case study from the low δ18O Scourie dikes, NW Scotland
  27. Accurate determination of Fe3+/ΣFe of andesitic glass by Mössbauer spectroscopy
  28. Recoil-free fractions of iron in aluminous bridgmanite from temperature-dependent Mössbauer spectra
  29. Chemical interactions between a sedimentary diapir and surrounding magma: Evidence from the Phepane Dome and Bushveld Complex, South Africa
  30. The crystal structures of Mg2Fe2C4O13, with tetrahedrally coordinated carbon, and Fe13O19, synthesized at deep mantle conditions
  31. New Mineral Names
  32. Book Review: Geodynamics, Third edition.
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