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Multi-stage barite crystallization in partially melted UHP eclogite from the Sulu belt, China

  • Songjie Wang , Lu Wang EMAIL logo , Michael Brown and Peng Feng
Published/Copyright: March 4, 2016
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American Mineralogist
From the journal American Mineralogist Volume 101 Issue 3

Abstract

Barite inclusions in rock-forming and accessory minerals and in multiphase solid inclusions (MSI) in ultrahigh pressure (UHP) eclogites have been controversially interpreted to record the presence of high-salinity oxidizing fluids[1] close to the peak of metamorphism. A detailed petrographic and microstructural study of barite in partially melted UHP eclogite from Yangkou, in the central Sulu belt of China demonstrates that barite precipitation is a multi-stage process. The different generations of barite provide insight into the evolution of fluid systems as P-T conditions evolved through the late prograde stage of subduction to the peak of UHP metamorphism and subsequently during exhumation. Five microstructural types of barite are recognized in this study. Type I barite (variable high to low Sr/Ba) occurs as equant primary inclusions with rutile in garnet and omphacite within coesite-bearing eclogite. Zr-in-rutile thermometry on the primary inclusions of rutile yields T = 658–699 °C at P = 2.5–4.5 GPa. Thus, barite inclusions were likely precipitated from an internally buffered fluid during the late prograde evolution. Type II barite (low Sr/Ba) occurs in MSI located toward the rims of garnet and omphacite. Since peak pressure was above the second critical endpoint for basaltic compositions, the MSI are inferred to represent aliquots of a silica-rich supercritical fluid trapped during the late prograde evolution close to the metamorphic peak. Type III barite (low Sr/Ba) occurs in pseudomorphs after phengite inclusions in garnet. The replacement phase assemblage formed during exhumation, by in situ melting of phengite. Type IV barite (low Sr/Ba) forms coarse-grained patches associated with sub-solidus replacement of omphacite by hornblende and albite symplectites along grain boundaries. Type V barite (low Sr/Ba) occurs as grain-boundary veinlets, intergranular grains, and closed rings around pyrite that is partly replaced by hematite and goethite. We interpret the types IV and V barite to have precipitated from an internally generated grain-boundary aqueous fluid, which is expected to be a response to H2O exsolving from garnet and omphacite during low-pressure amphibolite facies conditions. Therefore, barite precipitated during the late prograde subduction and the retrograde exhumation of UHP eclogite yields information about the mobility of Ba, Sr, and S during the metamorphic evolution.

Keywords: Barite; multiphase solid inclusions; supercritical fluid; partial melting; melt/fluid immiscibility; UHP eclogite; Sulu belt; Invited Centennial article

Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html.

Acknowledgments

This study was financially supported by the National Natural Science Foundation (no. 41272225, 41572182) and the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) (no. CUG-G1323511572). We thank Haihong Chen for help with whole-rock trace element analysis, Mouchun He for help with Raman spectroscopy and Zhenyu Chen and Shuiyuan Yang for help with EPMA analysis. We acknowledge constructive reviews from Anonymous and Simona Ferrando, and editorial advice from Daniela Rubatto.

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  1. Manuscript handled by Daniela Rubatto.

Received: 2015-4-20
Accepted: 2015-9-23
Published Online: 2016-3-4
Published in Print: 2016-3-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5384
Keywords for this article
Barite; multiphase solid inclusions; supercritical fluid; partial melting; melt/fluid immiscibility; UHP eclogite; Sulu belt; Invited Centennial article

Articles in the same Issue

  1. Editorial
  2. The most-cited journal in mineralogy and petrology (and what scientists can learn from baseball)
  3. Fluids in the Crust
  4. Fluids in the crust during regional metamorphism: Forty years in the Waterville limestone
  5. Research Article
  6. Remanent magnetization, magnetic coupling, and interface ionic configurations of intergrown rhombohedral and cubic Fe-Ti oxides: A short survey
  7. Research Article
  8. Are covalent bonds really directed?
  9. Dana Medal Paper
  10. Constraints on the early delivery and fractionation of Earth’s major volatiles from C/H, C/N, and C/S ratios
  11. Crossroads in Earth and Planetary Materials
  12. Octahedral chemistry of 2:1 clay minerals and hydroxyl band position in the near-infrared: Application to Mars
  13. Special Collection: Advances in Ultrahigh-Pressure Metamorphism
  14. Multi-stage barite crystallization in partially melted UHP eclogite from the Sulu belt, China
  15. Spinels Renaissance: The Past, Present, and Future of those Ubiquitous Minerals and Materials
  16. Crystal chemistry of spinels in the system MgAl2O4-MgV2O4-Mg2VO4
  17. Spinels Renaissance: The Past, Present, and Future of those Ubiquitous Minerals and Materials
  18. Magnetite spherules in pyroclastic iron ore at El Laco, Chile
  19. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  20. Evidence for dissolution-reprecipitation of apatite and preferential LREE mobility in carbonatite-derived late-stage hydrothermal processes
  21. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  22. Compositional variation of apatite from rift-related alkaline igneous rocks of the Gardar Province, South Greenland
  23. Special Collection: Perspectives on Origins and Evolution of Crustal Magmas
  24. Dynamics and thermodynamics of magma mixing: Insights from a simple exploratory model
  25. Special Collection: From Magmas to Ore Deposits
  26. Geochemistry, petrologic evolution, and ore deposits of the Miocene Bodie Hills Volcanic Field, California and Nevada
  27. Research Article
  28. Recognizing sulfate and phosphate complexes chemisorbed onto nanophase weathering products on Mars using in-situ and remote observations
  29. Research Article
  30. Crystallographic orientation relationships in host–inclusion systems: New insights from large EBSD data sets
  31. Research Article
  32. In-situ infrared spectroscopic studies of hydroxyl in amphiboles at high pressure
  33. Research Article
  34. Confined water in tunnel nanopores of sepiolite: Insights from molecular simulations
  35. Research Article
  36. Equation of state of the high-pressure Fe3O4 phase and a new structural transition at 70 GPa
  37. Research Article
  38. Reflectance spectroscopy of chromium-bearing spinel with application to recent orbital data from the Moon
  39. Research Article
  40. Temperature dependences of the hyperfine parameters of Fe2+ in FeTiO3 as determined by 57Fe-Mössbauer spectroscopy
  41. Letter
  42. Accurate predictions of iron redox state in silicate glasses: A multivariate approach using X-ray absorption spectroscopy
  43. Research Article
  44. New Mineral Names
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