Study of the Structure of Metasandstones Using Broadband Acoustic Spectroscopy with a Laser Source of Ultrasound

IF 0.9 4区 地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES
N. B. Podymova, A. V. Ponomarev, Yu. A. Morozov, M. A. Matveev, V. B. Smirnov, I. V. Sharychev
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引用次数: 0

Abstract

The results of measuring the frequency dependences of the attenuation coefficient and phase velocity of longitudinal ultrasonic waves in metasandstone samples with varying degrees of deformation–metamorphic alteration are presented to study the influence of the sample structure on these acoustic characteristics. The measurements are performed using broadband acoustic spectroscopy with a laser source of ultrasound and piezoelectric detection of nanosecond ultrasonic pulses in the 1–70 MHz operating frequency range. The metasandstones of the zonally metamorphosed Ladoga Group of the Paleoproterozoic Baltic Shield are studied, which exhibit varying degrees of structural and textural changes that occurred in the temperature range of 400–600°С. Cores of two different thicknesses with a similar mineral phase composition, but with some variations in the structural and textural composition of the substrate, were selected at four sampling points of different temperature levels and studied. For metasandstones from three sampling points, the frequency dependences of the attenuation coefficient and phase velocity of longitudinal ultrasonic waves almost completely coincide in three zones of each core and are nearly the same for cores of two different thicknesses. The latter fact confirms the reliability of the results of the ultrasonic studies, and the coincidence of the results for three different zones of each core shows that the structure of these metasandstones is uniform. The attenuation coefficient and phase velocity of ultrasound considerably differ in the studied zones of two metasandstone cores in one of the four sampling points (LV1246) due to the significant nonuniformity of their structure. In addition, for metasandstones from different sampling points, a difference in the absolute values of the attenuation coefficient and phase velocity of ultrasound is found in the entire studied frequency range. The Rayleigh model of ultrasonic scattering is used to estimate the maximum grain sizes in the studied samples. The results correlate with data obtained using optical microscopy of thin sections of all samples. The implemented broadband acoustic spectroscopy method with a laser source of ultrasound can help to reveal the relationship between the frequency dependences of the attenuation coefficient and phase velocity of longitudinal ultrasonic waves, the characteristic features of the structure, and conditions for the formation of metasandstones in each specific deposit.

Abstract Image

利用激光超声源的宽带声学光谱学研究元青石的结构
摘要 介绍了不同变形变质程度的元砂岩样品中纵向超声波的衰减系数和相位速度的频率相关性测量结果,以研究样品结构对这些声学特性的影响。测量采用宽带声学光谱法,使用激光超声源和压电检测纳秒级超声脉冲,工作频率范围为 1-70 MHz。研究对象是古近代波罗的海地盾拉多加组带变质的元砂岩,这些元砂岩在 400-600°С 的温度范围内发生了不同程度的结构和纹理变化。在不同温度水平的四个取样点选取了矿物相组成相似,但基质结构和纹理组成存在一些变化的两种不同厚度的岩芯进行研究。对于来自三个取样点的玄武岩,纵向超声波的衰减系数和相位速度的频率依赖关系在每个岩芯的三个区域几乎完全重合,并且对于两种不同厚度的岩芯几乎相同。后一个事实证实了超声波研究结果的可靠性,每个岩芯三个不同区域的结果一致,说明这些玄武岩的结构是均匀的。在四个取样点之一(LV1246)的两个元砂岩岩芯的研究区域内,超声波的衰减系数和相位速度存在很大差异,这是因为它们的结构明显不均匀。此外,对于不同取样点的玄武岩,在整个研究频率范围内,超声衰减系数和相位速度的绝对值也存在差异。超声波散射的瑞利模式用于估算所研究样本中的最大晶粒尺寸。结果与使用光学显微镜对所有样品的薄片所获得的数据相关。利用激光超声源实施的宽带声学光谱法有助于揭示纵向超声波的衰减系数和相位速度的频率依赖关系、结构特征以及每个特定矿床中元砂石的形成条件。
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来源期刊
CiteScore
1.40
自引率
28.60%
发文量
56
审稿时长
6-12 weeks
期刊介绍: Izvestiya, Atmospheric and Oceanic Physics is a journal that publishes original scientific research and review articles on vital issues in the physics of the Earth’s atmosphere and hydrosphere and climate theory. The journal presents results of recent studies of physical processes in the atmosphere and ocean that control climate, weather, and their changes. These studies have possible practical applications. The journal also gives room to the discussion of results obtained in theoretical and experimental studies in various fields of oceanic and atmospheric physics, such as the dynamics of gas and water media, interaction of the atmosphere with the ocean and land surfaces, turbulence theory, heat balance and radiation processes, remote sensing and optics of both media, natural and man-induced climate changes, and the state of the atmosphere and ocean. The journal publishes papers on research techniques used in both media, current scientific information on domestic and foreign events in the physics of the atmosphere and ocean.
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