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The thermal equation of state of (Fe0.86Mg0.07Mn0.07)3Al2Si3O12 almandine

Published online by Cambridge University Press:  05 July 2018

Dawei W. Fan
Affiliation:
Laboratoryfor Study of the Earth’s Interior and Geofluids, Institute of Geochemistry, Chinese Academyof Sciences, Guiyang 550002, China Graduate School of Chinese Academyof Science, Beijing 100049, China
Wenge G. Zhou*
Affiliation:
Laboratoryfor Study of the Earth’s Interior and Geofluids, Institute of Geochemistry, Chinese Academyof Sciences, Guiyang 550002, China
Congqiang Q. Liu
Affiliation:
Laboratoryfor Study of the Earth’s Interior and Geofluids, Institute of Geochemistry, Chinese Academyof Sciences, Guiyang 550002, China
Yonggang G. Liu
Affiliation:
Laboratoryfor Study of the Earth’s Interior and Geofluids, Institute of Geochemistry, Chinese Academyof Sciences, Guiyang 550002, China
Fang Wan
Affiliation:
Laboratoryfor Study of the Earth’s Interior and Geofluids, Institute of Geochemistry, Chinese Academyof Sciences, Guiyang 550002, China Graduate School of Chinese Academyof Science, Beijing 100049, China
Yinsuo S. Xing
Affiliation:
Laboratoryfor Study of the Earth’s Interior and Geofluids, Institute of Geochemistry, Chinese Academyof Sciences, Guiyang 550002, China Graduate School of Chinese Academyof Science, Beijing 100049, China
Jing Liu
Affiliation:
Institute of High Energy Physics, Chinese Academyof Science, Beijing 100049, China
Ligang G. Bai
Affiliation:
Institute of High Energy Physics, Chinese Academyof Science, Beijing 100049, China Graduate School of Chinese Academyof Science, Beijing 100049, China
Hongsen S. Xie
Affiliation:
Laboratoryfor Study of the Earth’s Interior and Geofluids, Institute of Geochemistry, Chinese Academyof Sciences, Guiyang 550002, China
*

Abstract

In situ X-raydiffraction measurements on almandine, (Fe0.86Mg0.07Mn0.07)3Al2Si3O12, were performed using a heating diamond-anvil cell instrument with synchrotron radiation at Beijing Synchrotron Radiation Facilityup to 27.7 GPa and 533 K. The pressure-volume-temperature data were fitted to a third-order Birch-Murnaghan equation of state. The isothermal bulk modulus of K0 = 177±2 GPa, a temperature derivative of the bulk modulus of (∂K/∂T)P= –0.032±0.016 GPaK–1 and a thermal expansion coefficient (α0) of (3.1±0.7)×10–5 K–1 were obtained. This is the first time that the temperature derivative of the bulk modulus of almandine has been determined at high pressure and high temperature. Combining these results with previous results, the compositional dependence of the bulk modulus, thermal expansion, and temperature derivative of the bulk modulus are discussed.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2009

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