Thermoelastic properties of grossular–andradite solid solution at high pressures and temperatures
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- 作者：Dawei Fan ; Yunqian Kuang ; Jingui Xu ; Bo Li ; Wenge Zhou…
- 关键词：Grossular–andradite solid solution ; Equation of state ; High pressure and high temperature ; X ; ray diffraction ; Diamond anvil cell
- 刊名：Physics and Chemistry of Minerals
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：44
- 期：2
- 页码：137-147
- 全文大小：
- 刊物类别：Earth and Environmental Science
- 刊物主题：Mineralogy; Crystallography and Scattering Methods; Geochemistry; Mineral Resources;
- 出版者：Springer Berlin Heidelberg
- ISSN：1432-2021
- 卷排序：44
文摘
The pressure–volume–temperature (P–V–T) equation of state (EoS) of synthetic grossular (Grs)–andradite (And) solid-solution garnet sample have been measured at high temperature up to 900 K and high pressures up to 22.75 GPa for Grs50And50, by using in situ angle-dispersive X-ray diffraction and diamond anvil cell. Analysis of room-temperature P–V data to a third-order Birch–Murnaghan (BM) EoS yields: V0 = 1706.8 ± 0.2 Å3, K0 = 164 ± 2 GPa and K′0 = 4.7 ± 0.5. Fitting of our P–V–T data by means of the high-temperature third-order BM EoS gives the thermoelastic parameters: V0 = 1706.9 ± 0.2 Å3, K0 = 164 ± 2 GPa, K′0 = 4.7 ± 0.2, (∂K/∂T)P = −0.018 ± 0.002 GPa K−1, and α0 = (2.94 ± 0.07) × 10−5 K−1. The results also confirm that grossular content increases the bulk modulus of the Grs-And join following a nearly ideal mixing model. The relation between bulk modulus and Grs mole fraction (XGrs) in this garnet join is derived to be K0 (GPa) = (163.7 ± 0.7) + (0.14 ± 0.02) XGrs (R2 = 0.985). Present results are also compared to previously studies determined the thermoelastic properties of Grs-And garnets.