Home Special Collection: New Advances in Subduction Zone Magma Genesis: Experimental formation of pyroxenite veins by reactions between olivine and Si, Al, Ca, Na, and Cl-rich fluids at 800 °C and 800 MPa: Implications for fluid metasomatism in the mantle wedge
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Special Collection: New Advances in Subduction Zone Magma Genesis: Experimental formation of pyroxenite veins by reactions between olivine and Si, Al, Ca, Na, and Cl-rich fluids at 800 °C and 800 MPa: Implications for fluid metasomatism in the mantle wedge

  • Thomas B. Grant EMAIL logo , Daniel E. Harlov and Dieter Rhede
Published/Copyright: April 5, 2016
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American Mineralogist
From the journal American Mineralogist Volume 101 Issue 4

Abstract

Fluids buffered by a plagioclase matrix are experimentally reacted with olivine megacrysts at 800 °C and 800 MPa (piston-cylinder press, CaF2 assembly) to form secondary veins of orthopyroxene ± clinopyroxene in the olivine. Fluids utilized were varied in both amount (0–2 wt%) and salinity (0–8 M NaCl). Assuming equilibrium with the plagioclase matrix, they are presumed enriched in Si, Al, Ca, Na, and Cl and are thereby similar in composition to slab-derived fluids. The experiments provide controlled, multi-component analogs of Si-metasomatism in the mantle wedge above subduction zones. The veins are dominated by orthopyroxene with minor clinopyroxene and form complex interconnected networks along fractures in the olivine. The reaction is rate limited by interfacial process of dissolution and precipitation. Porosity is developed throughout the veins and along sub-grain boundaries in the olivine megacrysts. These veins strongly resemble the textures observed in secondary metasomatic orthopyroxene veins widely reported in upper mantle xenoliths within arc magmas. A review of literature data on natural samples and experiments suggests that orthopyroxene ± clinopyroxene veins primarily form between 750–950 °C and over a large pressure range from 0.8–3.4 GPa. The abundance and composition of these metasomatic veins may vary as a function of pressure, variances in the fluid-rock partition coefficients, and/or by modification of the metasomatic fluid during the reaction.

Keywords: Experimental petrology; metasomatism, fluid; orthopyroxene veins
Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html

Acknowledgments

The authors thank Kristof Kusebauch for supplying the plagioclase starting material and Ralf Milke for helpful discussions. The GFZ is thanked for the use of the piston cylinder and EPMA facilities. Ananya Mallik and an anonymous reviewer are thanked for their constructive reviews and comments on the paper, as well as Susanne Straub for further comments and editorial handling of the manuscript.

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Received: 2015-5-28
Accepted: 2015-11-14
Published Online: 2016-4-5
Published in Print: 2016-4-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5441
Keywords for this article
Experimental petrology; metasomatism, fluid; orthopyroxene veins

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  36. Crystal structure of a new compound, CuZnCl(OH)3, isostructural with botallackite
  37. Research Article
  38. Elastic wave velocities in polycrystalline Mg3Al2Si3O12-pyrope garnet to 24 GPa and 1300 K
  39. Research Article
  40. Presentation of the Mineralogical Society of America Award for 2015 to Nicholas J. Tosca
  41. Research Article
  42. Acceptance of the Mineralogical Society of America Award for 2015
  43. Research Article
  44. Presentation of the 2015 Roebling Medal of the Mineralogical Society of America to Rodney C. Ewing
  45. Research Article
  46. Acceptance of the 2015 Roebling Medal of the Mineralogical Society of America
  47. Research Article
  48. Presentation of the Distinguished Public Service Award of the Mineralogical Society of America for 2015 to J. Alexander Speer
  49. Research Article
  50. Acceptance of the 2015 Mineralogical Society of America Distinguished Public Service Award
  51. Research Article
  52. Presentation of the Dana Medal of the Mineralogical Society of America for 2016 to Patrick Cordier
  53. Research Article
  54. Acceptance of the Dana Medal of the Mineralogical Society of America for 2016
  55. Book Review
  56. New Mineral Names*†
  57. Book Review
  58. Book Review
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