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- Title
Phase transitions between high- and low-temperature orthopyroxene in the Mg<sub>2</sub>Si<sub>2</sub>O<sub>6</sub>-Fe<sub>2</sub>Si<sub>2</sub>O<sub>6</sub> system.
- Authors
SHUGO OHI; AKIRA MIYAKE
- Abstract
We observed isosymmetric phase transitions of orthopyroxene in the Mg2Si2O6-Fe2Si2O6 system during high-temperature in situ X-ray powder diffraction experiments with a multiple-detector system and a high-temperature strip heater chamber in an atmosphere of Ar plus 1% H2. The transition temperatures we determined for natural orthopyroxenes were 1113-1147, 1120-1139, and around 1200 °C for Fs10, Fs14, and Fs37, respectively, and those for synthetic orthopyroxenes were 1048-1075, 961-1048, and 1037-1148 °C for Fs20, Fs30, and Fs46, respectively. Our experiments showed that the transition from low- to high-temperature orthopyroxene in the Mg2Si2O6-Fe2Si2O6 system occurred at about 1000-1200 °C. We concluded that the stability field of low-temperature orthopyroxene was below 1000 °C and that of high-temperature orthopyroxene was above 1200 °C.
- Subjects
ORTHOPYROXENE; MAGNESIUM silicates; IRON silicates; PHASE transitions; HIGH temperatures; LOW temperatures
- Publication
American Mineralogist, 2016, Vol 101, Issue 6, p1414
- ISSN
0003-004X
- Publication type
Article
- DOI
10.2138/am-2016-5394