Abstract
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 H2O and fluorite contents under ambient conditions, including one chondrodite [Mg4.88Si1.94O8(OH0.78F1.22)] (F61-Chn), one humite [Mg7.03Si3.07O12(OH1.26F0.74)] (F37-Hu), and two clinohumite [Mg8.85Ti0.19Si3.93O16(OH1.11F0.89) and Mg8.63Fe0.10Ti0.24Si3.97O16(OH1.84F0.16)] (F45-Chu and F8-Chu) samples. The adiabatic bulk (KS0) and shear (G0) moduli calculated from the elastic constants using Voigt-Reuss-Hill averages are: KS0 = 120.4(3) GPa and G0 = 74.1(5) GPa for F61-Chn, KS0 = 122.4(3) GPa and G0 = 78.4(2) GPa for F37-Hu, KS0 = 126.2(3) GPa and G0 = 79.7(2) GPa for F45-Chu, and KS0 = 120.5(3) GPa and G0 = 76.8(2) GPa for F8-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 H2O. 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 effects of composition on the elasticity and sound velocities of minerals along the forsterite-brucite join in the MgO-SiO2-H2O system, confirming previous observations. Increasing H2O 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.
Funding statement: This work is supported by the National Key R&D Program of China (2018YFA0702703), the China National Science Foundation (42241117 and 42272036), and the Fundamental Research Funds for the Central Universities (WK2080000144).
Acknowledgments
We thank the support of Wancai Li in conducting the EMPA measurements. We also appreciate the assistance of Haipeng Song in the XRD measurements under ambient conditions. The XRD data were collected using a Bruker D8 QUEST X-ray single crystal diffraction instrument at the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan.
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Articles in the same Issue
- Fingerprinting the source and complex history of ore fluids of a giant lode gold deposit using quartz textures and in-situ oxygen isotopes
- Cu isotope fractionation between Cu-bearing phases and hydrothermal fluids: Insights from ex situ and in situ experiments
- Barium mobility in a geothermal environment, Yellowstone National Park
- Single-crystal elasticity of humite-group minerals by Brillouin scattering
- Sulfur speciation in dacitic melts using X-ray absorption near-edge structure spectroscopy of the S K-edge (S-XANES): Consideration of radiation-induced changes and the implications for sulfur in natural arc systems
- Ab initio calculations and crystal structure simulations for mixed layer compounds from the tetradymite series
- A fast open data reduction workflow for the electron microprobe flank method to determine Fe3+/ΣFe contents in minerals
- Machine learning applied to apatite compositions for determining mineralization potential
- Reconstructing volatile exsolution in a porphyry ore-forming magma chamber: Perspectives from apatite inclusions
- Incommensurate to normal phase transition in malayaite
- Raman spectroscopic measurements on San Carlos olivine up to 14 GPa and 800 K: Implications for thermodynamic properties
- Chemical and boron isotopic composition of tourmaline from the Yixingzhai gold deposit, North China Craton: Proxies for ore fluids evolution and mineral exploration
- Tourmaline chemical and boron isotopic constraints on the magmatic-hydrothermal transition and rare-metal mineralization in alkali granitic systems
- New Mineral Names
Articles in the same Issue
- Fingerprinting the source and complex history of ore fluids of a giant lode gold deposit using quartz textures and in-situ oxygen isotopes
- Cu isotope fractionation between Cu-bearing phases and hydrothermal fluids: Insights from ex situ and in situ experiments
- Barium mobility in a geothermal environment, Yellowstone National Park
- Single-crystal elasticity of humite-group minerals by Brillouin scattering
- Sulfur speciation in dacitic melts using X-ray absorption near-edge structure spectroscopy of the S K-edge (S-XANES): Consideration of radiation-induced changes and the implications for sulfur in natural arc systems
- Ab initio calculations and crystal structure simulations for mixed layer compounds from the tetradymite series
- A fast open data reduction workflow for the electron microprobe flank method to determine Fe3+/ΣFe contents in minerals
- Machine learning applied to apatite compositions for determining mineralization potential
- Reconstructing volatile exsolution in a porphyry ore-forming magma chamber: Perspectives from apatite inclusions
- Incommensurate to normal phase transition in malayaite
- Raman spectroscopic measurements on San Carlos olivine up to 14 GPa and 800 K: Implications for thermodynamic properties
- Chemical and boron isotopic composition of tourmaline from the Yixingzhai gold deposit, North China Craton: Proxies for ore fluids evolution and mineral exploration
- Tourmaline chemical and boron isotopic constraints on the magmatic-hydrothermal transition and rare-metal mineralization in alkali granitic systems
- New Mineral Names