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Precipitates of α-cristobalite and silicate glass in UHP clinopyroxene from a Bohemian Massif eclogite

  • Tina R. Hill , Hiromi Konishi , Franklin Hobbs , Seungyeol Lee and Huifang Xu EMAIL logo
Published/Copyright: September 27, 2019
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Abstract

Low-pressure metastable nanoscale crystals of α-cristobalite have been observed epitaxially ex-solved in cores of UHP clinopyroxene from the Bohemian Massif, Czech Republic. SAED patterns and HRTEM images detail the close structural relationship between host clinopyroxene and α-cristobalite precipitate: [001]Di║[010]a, (010)Di ~ ║(101)a. TEM results indicate that α-cristobalite exsolved from host clinopyroxene. Non-crystalline Al-bearing silicate phases, also exsolved from UHP clinopyroxene, possesses Al/Si ratios close to eutectic compositions in the system NaAlSi3O8-SiO2-H2O system. The presence of glass exsolution suggests a high-temperature formation environment and presence of water. The α-cristobalite formed in a localized low-pressure, micro-environment formed through exsolution of vacancies and excess silica from the host pyroxene lattice. This micro-environment may be a result of negative density changes due to excess lower density silica exsolving from higher density pyroxene during an exsolution process that involved no localized volume change. Interface-controlled exsolution via lattice matching at the diopside/cristobalite interface, and stability changes and melting point depression due to nanoscale size effects contributed to the formation and persistence of this metastable phase. Amphibole in association with α-cristobalite and some non-crystalline silicate phases may be a clue to localized water quantities; silica exsolution with amphibole may have formed below the eutectic temperature and at a later stage than non-crystalline silicate phases without amphibole. Silica rods in Nové Dvory clinopyroxenes were previously thought to be quartz; however, our investigation reveals various low-pressure, high-temperature, and/or metastable phases greatly affected by the presence of vacancy and OH in clinopyroxenes. The results will help us better understand OH in the UHP pyroxene and even water release in the mantle.


Orcid 0000-0002-7464-0057

† Present address: Department of Geology, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, 12 Niigata 950-2181, Japan.

‡ Orcid 0000-0002-0175-1389.

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


Acknowledgments

The authors thank Gordon Medaris for providing the samples and suggestions. This study was supported by National Science Foundation (EAR-0810150, EAR-1530614).

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Received: 2018-08-03
Accepted: 2019-06-17
Published Online: 2019-09-27
Published in Print: 2019-10-25

© 2019 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Carbonation and the Urey reaction
  2. Carbonation and decarbonation reactions: Implications for planetary habitability
  3. PO4 adsorption on the calcite surface modulates calcite formation and crystal size
  4. High-pressure Raman and Nd3+ luminescence spectroscopy of bastnäsite-(REE)CO3F
  5. Precipitates of α-cristobalite and silicate glass in UHP clinopyroxene from a Bohemian Massif eclogite
  6. Solubility behavior of δ-AlOOH and ɛ-FeOOH at high pressures
  7. Analyst and etching protocol effects on the reproducibility of apatite confined fission-track length measurement, and ambient-temperature annealing at decadal timescales
  8. Identification of interstratified mica and pyrophyllite monolayers within chlorite using advanced scanning/transmission electron microscopy
  9. Interdiffusion of major elements at 1 atmosphere between natural shoshonitic and rhyolitic melts
  10. Factors controlling the crystal morphology and chemistry of garnet in skarn deposits: A case study from the Cuihongshan polymetallic deposit, Lesser Xing’an Range, NE China
  11. Gasparite-(La), La(AsO4), a new mineral from Mn ores of the Ushkatyn-III deposit, Central Kazakhstan, and metamorphic rocks of the Wanni glacier, Switzerland
  12. Cation ordering, valence states, and symmetry breaking in the crystal-chemically complex mineral chevkinite-(Ce): Recrystallization, transformation, and metamict states in chevkinite
  13. Discrete Zr and REE mineralization of the Baerzhe rare-metal deposit, China
  14. Origin of Monte Rosa whiteschist from in-situ tourmaline and quartz oxygen isotope analysis by SIMS using new tourmaline reference materials
  15. Chenmingite, FeCr2O4 in the CaFe2O4-type structure, a shock-induced, high-pressure mineral in the Tissint martian meteorite
  16. Letter
  17. Single-crystal elasticity of iron-bearing phase E and seismic detection of water in Earth’s upper mantle
  18. Book Review
  19. Book Review
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