We report the results of a natural phenacite from 0 to 30.9 GPa using in situ angle-dispersive X-ray diffraction and a diamond anvil cell at the National Synchrotron Light Source, Brookhaven National Laboratory. Over this pressure range, no phase change or disproportionation has been observed. The isothermal equation of state was determined. The values of V0 , K0 , and K0 refined with a third-order Birch-Murnaghan equation of state are V0 =1116.1 ± 1.2 3 , K0 =223±9 GPa, and K 0 =5.5 ± 0.8. Furthermore, we confirm that the linear compressibilities (β) along a and c directions of phenacite are elastically isotropic (βa =1.50 × 10-3 and βc =1.34 × 10-3 GPa-1). Consequently, it can be concluded that the compressibility of phenacite under high pressures has been accurately constrained.
The Proterozoic Wenquan granite occurs at the northern margin of the North China craton.New U-Pb zircon ages r...
Neng Jiang~*,Jinghui Guo,Mingguo Zhai State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,China
The compression behavior of a natural hydroxyapophyllite is investigated up to about 10.01 GPa at 300 K using in situ angle-dispersive X-ray diffraction and a diamond anvil cell at the High Pressure Experiment Station, Beijing Synchrotron Radiation Facility (BSRF). Over this pressure range, no phase change or disproportionation is observed. The isothermal equation of state is determined for the first time. The values of zero-pressure volume V0 , isothermal bulk modulus K0 , and K0 refined with a third-order Birch-Murnaghan equation of state are V0 = 1276.3±0.9 3 , K0 = 71±3 GPa, and K0 = 8±1. Furthermore, we confirm that the values of linear compressibility β along the a and c directions of hydroxyapophyllite are elastically anisotropic.
