Self-Consistent Thermodynamic Parameters of Diopside at High Temperatures and High Pressures: Implications for the Adiabatic Geotherm of an Eclogitic Upper Mantle
Self-Consistent Thermodynamic Parameters of Diopside at High Temperatures and High Pressures: Implications for the Adiabatic Geotherm of an Eclogitic Upper Mantle
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高温高压透辉石自洽热力学参数：对榴辉岩上地幔绝热地温的影响
DOI：
10.3390/min11121322
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发表时间：
2021-11
期刊：
影响因子：
2.5
通讯作者：
Wuxueying Qiu
中科院分区：
文献类型：
--
作者：
Chang Su;Dawei Fan;Jiyi Jiang;Zhenjun Sun;Yonggang Liu;Wei Song;Yongge Wan;Guang Yang;Wuxueying Qiu
Using an iterative numerical approach, we have obtained the self-consistent thermal expansion, heat capacity, and Grüneisen parameters of diopside (MgCaSi2O6) over wide pressure and temperature ranges based on experimental data from the literature. Our results agree well with the published experimental and theoretical data. The determined thermodynamic parameters exhibit nonlinear dependences with increasing pressure. Compared with other minerals in the upper mantle, we found that the adiabatic temperature gradient obtained using the thermodynamic data of diopside is larger than that of garnet while lower than that of olivine, when ignoring the Fe incorporation. Combining our results with thermodynamic parameters of garnet obtained in previous studies, we have estimated the adiabatic temperature gradient and geotherm of an eclogitic upper mantle in a depth range of 200–450 km. The results show that the estimated adiabatic temperature gradient of the eclogite model is ~16% and ~3% lower than that of the pyrolite model at a depth of 200 km and 410 km, respectively. However, the high mantle potential temperature of the eclogite model leads to a similar temperature as the pyrolite model in a depth range of 200–410 km.
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影响因子：
3.1
作者：
Loursn LEvreN'eNo;CHeRtEs T. PREwrrr
通讯作者：
Loursn LEvreN'eNo;CHeRtEs T. PREwrrr
影响因子：
2.3
作者：
Lin‐gun Liu
通讯作者：
Lin‐gun Liu
影响因子：
2.3
作者：
S. Ono
通讯作者：
S. Ono
影响因子：
1.4
作者：
D. G. Isaak;I. Ohno;P. Lee
通讯作者：
D. G. Isaak;I. Ohno;P. Lee
影响因子：
64.8
作者：
A. .. Ringwood;T. Irifune
通讯作者：
A. .. Ringwood;T. Irifune