High-pressure behavior of liebenbergite: The most incompressible olivine-structured silicate
Dongzhou Zhang;   Yi Hu;   Jingui Xu;   Robert T. Downs;   Julia E. Hammer;   Przemyslaw K. Dera
刊名American Mineralogist
2019
卷号104期号:4页码:580–587
关键词Olivine Ni high Pressure equation Of States single-crystal Diffraction
英文摘要

Nickel is an abundant element in the bulk earth, and nickel-dominant olivine, liebenbergite, is the only igneous nickel-rich silicate found in nature. In this study, we used high-pressure single-crystal diffraction to explore the compressional behavior of a synthetic liebenbergite sample up to 42.6 GPa at ambient temperature. Over the studied pressure range, the liebenbergite sample retains the orthorhombic Pbnm structure, and no phase transition is observed. A third-order Birch-Murnaghan equation of state was used to fit the pressure behavior of the unit-cell volume, lattice parameters, the polyhedral volume, and the average bond length within each polyhedron. The best-fit bulk modulus KT0 = 163(3) GPa and its pressure derivative K′T0KT0′ = 4.5(3). We find that liebenbergite is the most incompressible olivine-group silicate reported thus far, and Ni2+ tends to increase the isothermal bulk modulus of both olivine- and spinel-structured silicates. Consequently, Ni-rich olivine has a higher density compared to Ni-poor olivine at the upper mantle P-T conditions; however enrichment of Ni in mantle olivine is generally too low to make this density difference relevant for fractionation or buoyancy.

语种英语
内容类型期刊论文
源URL[http://ir.gyig.ac.cn/handle/42920512-1/10490]  
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.Department of Geology and Geophysics, University of Hawaii at Manoa Honolulu, Hawaii 96822, U.S.A. Orcid 0000-0002-5977-2932
2.Department of Geosciences, University of Arizona, Tucson, Arizona 85721, U.S.A
3.Key Laboratory of High-Temperature and High-Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550081, China
4.Department of Geology and Geophysics, University of Hawaii at Manoa Honolulu, Hawaii 96822, U.S.A.
5.GeoSoilEnviroCARS, University of Chicago, Lemont, Illinois 60439, U.S.A. Orcid 0000-0002-6679-892X
6.Dongzhou Zhang; Yi Hu; Jingui Xu; Robert T. Downs; Julia E. Hammer; Przemyslaw K. Dera
推荐引用方式
GB/T 7714
Dongzhou Zhang; Yi Hu; Jingui Xu; Robert T. Downs; Julia E. Hammer; Przemyslaw K. Dera. High-pressure behavior of liebenbergite: The most incompressible olivine-structured silicate[J]. American Mineralogist,2019,104(4):580–587.
APA Dongzhou Zhang; Yi Hu; Jingui Xu; Robert T. Downs; Julia E. Hammer; Przemyslaw K. Dera.(2019).High-pressure behavior of liebenbergite: The most incompressible olivine-structured silicate.American Mineralogist,104(4),580–587.
MLA Dongzhou Zhang; Yi Hu; Jingui Xu; Robert T. Downs; Julia E. Hammer; Przemyslaw K. Dera."High-pressure behavior of liebenbergite: The most incompressible olivine-structured silicate".American Mineralogist 104.4(2019):580–587.
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