Effects of water on P-V-T equation of state of pyrope | |
Dawei Fan; Chang Lu; Jingui Xu; Bingmin Yan; Bin Yang; Jiuhua Chen | |
刊名 | Physics of the Earth and Planetary Interiors |
2017 | |
卷号 | 267页码:9–18 |
关键词 | Hydrous Pyrope Equation Of State High Temperature And Pressure X-ray Diffraction Diamond Anvil Cell |
英文摘要 | High-pressure single-crystal/powder synchrotron X-ray diffraction was carried out on a hydrous pure magnesium pyrope (Mg3Al2Si3O12) containing 900 ppmw H2O, synthesized at 4.0 GPa and 1300 K. The pressure-volume (P-V) single-crystal data from room pressure to 9.81 GPa at ambient temperature were fitted by a third-order Birch-Murnaghan equation of state (BM-EoS) yielding a unit-cell volume of V0 = 1505.14 ± 0.38 Å3 , an isothermal bulk modulus of K0 = 160 ± 3 GPa and its pressure derivative K0 0 = 5.2 ± 0.4. When fixing K’0 = 4.0, the data yielded V0 = 1504.58 ± 0.32 Å3 and K0 = 166 ± 2 GPa. The pressure-volume-temperature (P-V-T) EoS of the synthetic hydrous pyrope was also measured at temperatures up to 900 K and pressures up to 16.75 GPa, using a diamond anvil cell in conjunction with in situ synchrotron angle-dispersive powder X-ray diffraction. The P-V data at room temperature and in a pressure range of 0.0001–14.81 GPa were then analyzed by a third-order BM-EoS and yielded V0 = 1505.35 ± 0.25 Å3 , K0 = 161 ± 2 GPa, K0 0 = 5.0 ± 0.3. With K’0 fixed to 4.0, we also obtained V0 = 1505.04 ± 0.29 Å3 and K0 = 167 ± 1 GPa. Consequently, we fitted the P-V-T data with the hightemperature third-order BM-EoS approach and obtained the thermoelastic parameters of V0 = 1505.4 ± 0.3 Å3 , K0 = 162 ± 1 GPa, K0 0 = 4.9 ± 0.2, the temperature derivative of the bulk modulus (@K0/@T)P = 0.018 ± 0.004 GPa K1 , and the thermal expansion coefficient at ambient conditions a0 = (3.2 ± 0.1) 105 K1 . These properties were consistent with the thermal pressure EoS analysis. These new results on hydrous pyrope were also compared with previous studies of anhydrous pyrope. The main effect of hydration on pyrope is to decrease K0 and increase K’0 by increasing the vacancies or unoccupied volume in the structure. The entire dataset enabled us to examine the thermoelastic properties of important mantle garnets and this data has further applications for modeling the P-T conditions in the upper mantle of the Earth’s interior using deep mineral assemblages. 2 |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.gyig.ac.cn/handle/42920512-1/8343] |
专题 | 地球化学研究所_地球内部物质高温高压实验室 |
作者单位 | 1.Center for the Study of Matter at Extreme Conditions, Department of Mechanical and Materials Engineering, Florida International University, Miami 33199, USA 2.University of Chinese Academy of Sciences, Beijing 100049, China 3.Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX 78712, USA 4.Key Laboratory for High Temperature and High Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China 5.Center for High Pressure Science and Technology Advanced Research, Changchun 130012, China |
推荐引用方式 GB/T 7714 | Dawei Fan;Chang Lu;Jingui Xu;Bingmin Yan;Bin Yang;Jiuhua Chen. Effects of water on P-V-T equation of state of pyrope[J]. Physics of the Earth and Planetary Interiors,2017,267:9–18. |
APA | Dawei Fan;Chang Lu;Jingui Xu;Bingmin Yan;Bin Yang;Jiuhua Chen.(2017).Effects of water on P-V-T equation of state of pyrope.Physics of the Earth and Planetary Interiors,267,9–18. |
MLA | Dawei Fan;Chang Lu;Jingui Xu;Bingmin Yan;Bin Yang;Jiuhua Chen."Effects of water on P-V-T equation of state of pyrope".Physics of the Earth and Planetary Interiors 267(2017):9–18. |
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