Thermal expansivity and high-pressure sound velocities of natural topaz and implications for seismic velocities and H2O and fluorine recycling in subduction zones

IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Physics and Chemistry of Minerals Pub Date : 2023-04-17 DOI:10.1007/s00269-023-01238-5
Mingsheng Zhao, Nao Cai, Duojun Wang, Qiong Liu
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Abstract

Topaz is an important mineral formed in deeply subducted sediments and might be a major carrier of both H2O and fluorine into the Earth’s interior. To better understand the seismic velocities and H2O and fluorine recycling in subduction zones, we determined the thermal expansivity of a natural topaz (Al1.93(1)Si1.06(1)O4(OH)0.48(3)F1.52(3), space group pbnm) up to 1073 K using high-temperature powder X-ray diffraction. No phase transition or decomposition was observed within the investigated temperature range. The volume thermal expansion coefficient is 2.24(1) × 10–5 K−1, and the ratio of the axial thermal expansion coefficients α0(a):α0(b):α0(c) is 1.15:1:1.32 at 300 K. We also investigated its compressional (P) and shear (S) wave velocities up to 13.6 GPa at room temperature using ultrasonic interferometry in a multi-anvil apparatus. The adiabatic bulk modulus (Ks) and shear modulus (G) of topaz and their pressure derivatives are KS0 = 151(1) GPa, KS = 4.9(1), G0 = 109.4(10) GPa, and G′ = 1.8(1), respectively, by fitting the velocities and density data to finite strain equations. The density and velocity profiles of the topaz were calculated under the upper mantle P–T conditions. Our results reveal that topaz is prone to subduction which drives H2O and fluorine to migrate to the deep Earth. Meanwhile, topaz also has unusually high VP and VS, and low VP/VS ratio relative to common upper mantle phases and the preliminary reference Earth model (PREM, Dziewonski and Anderson, Phys Earth Planet Inter 25:297–356, 1981), which may be diagnostic seismic properties in subducted slabs.

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天然黄玉的热膨胀率和高压声速及其对俯冲带地震速度和水和氟再循环的影响
黄玉是一种重要的矿物,形成于深俯冲的沉积物中,可能是水和氟进入地球内部的主要载体。为了更好地了解俯冲带的地震速度和水和氟的再循环,我们利用高温粉末x射线衍射测定了天然黄玉(Al1.93(1)Si1.06(1)O4(OH)0.48(3)F1.52(3),空间群pnm)高达1073 K的热膨胀率。在所研究的温度范围内未观察到相变或分解。在300 K时,体积热膨胀系数为2.24(1)× 10-5 K−1,轴向热膨胀系数α0(a):α0(b):α0(c)之比为1.15:1:1.32。我们还利用超声干涉测量技术在室温下测量了其高达13.6 GPa的纵波(P)和横波(S)波速。通过将速度和密度数据拟合到有限应变方程中,得到黄玉的绝热体模量(Ks)和剪切模量(G)及其压力导数分别为KS0 = 151(1) GPa、Ks′= 4.9(1)、G0 = 109.4(10) GPa和G′= 1.8(1)。在上地幔P-T条件下,计算了黄玉的密度和速度分布。我们的研究结果表明,黄玉容易发生俯冲,这促使水和氟向地球深部迁移。与此同时,相对于普通上地幔相和初步参考地球模型(PREM, Dziewonski和Anderson, Phys Earth Planet Inter 25:297-356, 1981),黄玉具有异常高的VP和VS,且VP/VS比较低,这可能是俯冲板块地震特性的诊断。
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来源期刊
Physics and Chemistry of Minerals
Physics and Chemistry of Minerals 地学-材料科学:综合
CiteScore
2.90
自引率
14.30%
发文量
43
审稿时长
3 months
期刊介绍: Physics and Chemistry of Minerals is an international journal devoted to publishing articles and short communications of physical or chemical studies on minerals or solids related to minerals. The aim of the journal is to support competent interdisciplinary work in mineralogy and physics or chemistry. Particular emphasis is placed on applications of modern techniques or new theories and models to interpret atomic structures and physical or chemical properties of minerals. Some subjects of interest are: -Relationships between atomic structure and crystalline state (structures of various states, crystal energies, crystal growth, thermodynamic studies, phase transformations, solid solution, exsolution phenomena, etc.) -General solid state spectroscopy (ultraviolet, visible, infrared, Raman, ESCA, luminescence, X-ray, electron paramagnetic resonance, nuclear magnetic resonance, gamma ray resonance, etc.) -Experimental and theoretical analysis of chemical bonding in minerals (application of crystal field, molecular orbital, band theories, etc.) -Physical properties (magnetic, mechanical, electric, optical, thermodynamic, etc.) -Relations between thermal expansion, compressibility, elastic constants, and fundamental properties of atomic structure, particularly as applied to geophysical problems -Electron microscopy in support of physical and chemical studies -Computational methods in the study of the structure and properties of minerals -Mineral surfaces (experimental methods, structure and properties)
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