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Humite-group minerals play a crucial role in transporting water and fluorine to the Earth's deep mantle through slab sinking. In this study, we have used Brillouin scattering to determine the single-crystal elastic constants of four natural humite-group minerals with varying H 2 O and fluorite contents under ambient conditions, including one chondrodite [Mg 4.88 Si 1.94 O 8 (OH 0.78 F 1.22 )] (F 61 -Chn), one humite [Mg 7.03 Si 3.07 O 12 (OH 1.26 F 0.74 )] (F 37 -Hu), and two clinohumite [Mg 8.85 Ti 0.19 Si 3.93 O 16 (OH 1.11 F 0.89 ) and Mg 8.63 Fe 0.10 Ti 0.24 Si 3.97 O 16 (OH 1.84 F 0.16 )](F 45 -Chu and F 8 -Chu) samples. The adiabatic bulk (K S0 ) and shear (G 0 ) moduli calculated from the elastic constants using Voigt-Reuss-Hill averages are: K S0 = 120.4(3) GPa and G 0 = 74.1(5)GPa for F 61 -Chn, K S0 = 122.4(3) GPa and G 0 = 78.4(2) GPa for F 37 -Hu, K S0 = 126.2(3) GPa and G 0 = 79.7(2) GPa for F 45 -Chu, and K S0 = 120.5(3) GPa and G 0 = 76.8(2) GPa for F 8 -Chu. Our results indicate that the addition of F leads to a noticeable increase in the elasticity of clinohumite and chondrodite, which is in contrast to the effect of H 2 O. Although Fe has a negligible effect on the bulk modulus of clinohumite, it can produce a substantial decrease in the shear modulus. These results provide important insights into the influence of humite-group minerals on the mantle velocity structure. Furthermore, we have investigated the influence of composition on the elasticity and sound velocities of minerals along the forsterite-brucite join in the MgO-SiO 2 -H 2 O system, confirming previous observations. Increasing H 2 O content along the forsterite-brucite join leads to apparent reductions in the elasticity and sound velocities. The influence of Fe on the elasticity and sound velocities of these minerals has also been evaluated.
Humite-group minerals play a crucial role in transporting water and fluorine to the Earth's deep mantle through slab sinking. In this study, we have used Brillouin scattering to determine the single-crystal elastic constants of four natural humite-group minerals with varying H 2 O and fluorite contents under ambient conditions, including one chondrodite [Mg 4.88 Si 1.94 O 8 (OH 0.78 F 1.22 )] (F 61 -Chn), one humite [Mg 7.03 Si 3.07 O 12 (OH 1.26 F 0.74 )] (F 37 -Hu), and two clinohumite [Mg 8.85 Ti 0.19 Si 3.93 O 16 (OH 1.11 F 0.89 ) and Mg 8.63 Fe 0.10 Ti 0.24 Si 3.97 O 16 (OH 1.84 F 0.16 )](F 45 -Chu and F 8 -Chu) samples. The adiabatic bulk (K S0 ) and shear (G 0 ) moduli calculated from the elastic constants using Voigt-Reuss-Hill averages are: K S0 = 120.4(3) GPa and G 0 = 74.1(5)GPa for F 61 -Chn, K S0 = 122.4(3) GPa and G 0 = 78.4(2) GPa for F 37 -Hu, K S0 = 126.2(3) GPa and G 0 = 79.7(2) GPa for F 45 -Chu, and K S0 = 120.5(3) GPa and G 0 = 76.8(2) GPa for F 8 -Chu. Our results indicate that the addition of F leads to a noticeable increase in the elasticity of clinohumite and chondrodite, which is in contrast to the effect of H 2 O. Although Fe has a negligible effect on the bulk modulus of clinohumite, it can produce a substantial decrease in the shear modulus. These results provide important insights into the influence of humite-group minerals on the mantle velocity structure. Furthermore, we have investigated the influence of composition on the elasticity and sound velocities of minerals along the forsterite-brucite join in the MgO-SiO 2 -H 2 O system, confirming previous observations. Increasing H 2 O content along the forsterite-brucite join leads to apparent reductions in the elasticity and sound velocities. The influence of Fe on the elasticity and sound velocities of these minerals has also been evaluated.
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