Phase transition of zircon at high P-T conditions
详细信息 查看全文
- 作者：Shigeaki Ono ; Kenichi Funakoshi ; Yoichi Nakajima ; Yoshinori Tange and Tomoo Katsura
- 刊名：Contributions to Mineralogy and Petrology
- 出版年：2004
- 出版时间：June 2004
- 年：2004
- 卷：147
- 期：4
- 页码：505-509
- 全文大小：223 KB
- 刊物类别：Earth and Environmental Science
- 刊物主题：Earth sciences
Geology
Mineral Resources
Mineralogy - 出版者：Springer Berlin / Heidelberg
- ISSN：1432-0967
文摘
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, the 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.