Intracrystalline Olivine-Ringwoodite Transformation and Time-Dependent Growth Rates.

• Kerschhofer L.

  Bayerisches Geoinstitut, Universitaet Bayreuth

• Liu M.

  Dept. of Earth, Atmospheric and Planetary Sciences

• Rubie D. C.

  Bayerisches Geoinstitut, Universitaet Bayreuth

• McConnell J. D. C.

  Dept. of Earth Sciences, University of Oxford

• Sharp T. G.

  Dept. of Geology, Arizona State University

• Dupas C.

  Bayerisches Geoinstitut, Universitaet Bayreuth

Bibliographic Information

Other Title

• Intracrystalline Olivine-Ringwoodite Tr

Abstract

During the transformation of olivine (Fo₉₀) to ringwoodite and wadsleyite at 18-20 GPa three transformation microstructures develop: (i) Reaction rims form around olivine by incoherent grain boundary nucleation; the growth rates of these rims decrease strongly with reaction time because the volume decrease causes elastic strain to develop. (ii) Intracrystalline, coherent ringwoodite lamellae nucleate on previously formed (100) _α stacking faults. (iii) Polycrystalline ringwoodite and/or wadsleyite lenses develop in the interior of relict olivine crystals by nucleation of incoherent grains on the coherent ringwoodite lamellae. The observed intracrystalline transformation mechanism and the time-dependence of growth have important implications for predicting the depth of the olivine-spinel transformation in subducting lithosphere.

Journal

• The Review of High Pressure Science and Technology

  The Review of High Pressure Science and Technology 7 28-33, 1998

  The Japan Society of High Pressure Science and Technology

Keywords

• olivine
• high pressure transformation mechanism
• transformational strain
• intracrystalline nucleation
• subduction

Details

• CRID: 1390001204381774592
• NII Article ID: 10002688615
• NII Book ID: AN10452913
• DOI: 10.4131/jshpreview.7.28
• ISSN: 13481940
• ISSN: 0917639X
• NDL BIB ID: 4493829
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4493829
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed