Thermal equation of state of synthetic orthoferrosilite at lunar pressures and temperatures
Thermal equation of state of synthetic orthoferrosilite at lunar pressures and temperatures
复制标题
月球压力和温度下合成正铁硅石的状态热方程
DOI:
10.1007/s00269-013-0605-5
复制
发表时间:
2013
影响因子:
1.4
通讯作者:
W. Van Westrenen
中科院分区:
文献类型:
--
作者:
J. de Vries;M.H.G. Jacobs;A.P. van den Berg;M. Wehber;C. Lathe;C.A. McCammon;W. Van Westrenen
Iron-rich orthopyroxene plays an important role in models of the thermal and magmatic evolution of the Moon, but its density at high pressure and high temperature is not well-constrained. We present in situ measurements of the unit-cell volume of a synthetic polycrystalline end-member orthoferrosilite (FeSiO3, fs) at simultaneous high pressures (3.4–4.8 GPa) and high temperatures (1,148–1,448 K), to improve constraints on the density of orthopyroxene in the lunar interior. Unit-cell volumes were determined through in situ energy-dispersive synchrotron X-ray diffraction in a multi-anvil press, using MgO as a pressure marker. Our volume data were fitted to a high-temperature Birch–Murnaghan equation of state (EoS). Experimental data are reproduced accurately, with astandard deviation of 0.20 GPa. The resulting thermoelastic parameters of fs are:V0= 875.8 ± 1.4 Å3,K0= 74.4 ± 5.3 GPa, and, assuming. We also determined the thermal equation of state of a natural Fe-rich orthopyroxene from Hidra (Norway) to assess the effect of magnesium on the EoS of iron-rich orthopyroxene. Comparison between our two data sets and literature studies shows good agreement for room-temperature, room-pressure unit-cell volumes. Preliminary thermodynamic analyses of orthoferrosilite, FeSiO3, and orthopyroxene solid solutions, (Mg1−xFex) SiO3, using vibrational models show that our volume measurements in pressure–temperature space are consistent with previous heat capacity and one-bar volume–temperature measurements. The isothermal bulk modulus at ambient conditions derived from our measurements is smaller than values presented in the literature. This new simultaneous high-pressure, high-temperature data are specifically useful for calculations of the orthopyroxene density in the Moon.
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DOI:
--
发表时间:
1999
期刊:
影响因子:
--
作者:
M. Stimpfl;J. Ganguly;G. Molin
通讯作者:
G. Molin
影响因子:
3.1
作者:
J. Kung;I. Jackson;R. Liebermann
通讯作者:
R. Liebermann
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
R. Küchler;P. Gegenwart;K. Heuser;E. Scheidt;G. Stewart;F. Steglich
通讯作者:
F. Steglich
DOI:
--
发表时间:
1970
期刊:
影响因子:
--
作者:
S. Ghose;S. Saxena
通讯作者:
S. Saxena
影响因子:
1.4
作者:
M. Jacobs;B. Jong
通讯作者:
B. Jong