Article thumbnail

Phase transition of zircon at high P-T conditions

By Shigeaki Ono, Kenichi Funakoshi, Yoichi Nakajima, Yoshinori Tange and Tomoo Katsura

Abstract

In situ observations of the zircon-reidite transition in ZrSiO4 were carried out using a multianvil high-pressure apparatus and synchrotron radiation. The phase boundary between zircon and reidite was determined to be P (GPa) = 8.5 + 0.0017×(T-1200) (K) for temperatures between 1100-1900 K. When subducted slabs, including igneous rocks and sediments, descend into the upper mantle, zircon in the subducted slab transforms into reidite at pressures of about 9 GPa, corresponding to a depth of 270 km. Reidite found in an upper Eocene impact ejecta layer in marine sediments is thought to have been transformed from zircon by a shock event. The peak pressure generated by the shock event in this occurrence is estimated to be higher than 8 GPa

Topics: high-pressure phase, kokchetav massif, northern KAZAKSTAN; METAMORPHIC ROCKS; ZRSIO4; TRANSFORMATIONS; POLYMORPH; REIDITE; STATE; GPA
Publisher: 'Springer Science and Business Media LLC'
Year: 2004
DOI identifier: 10.1007/s00410-004-0570-6
OAI identifier: oai:EPrintsOUDIR.lib.okayama-u.ac.jp:33999
Journal:
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://ousar.lib.okayama-u.ac.... (external link)
  • http://ousar.lib.okayama-u.ac.... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.