地球动力学

IF 1 Q3 GEOCHEMISTRY & GEOPHYSICS

Geodynamics Pub Date : 2022-06-28 DOI:10.23939/jgd2022.02.092

I. Safarov

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引用次数: 0

摘要

在高温高压条件下确定岩土材料的物理参数对于地质学和地球物理学的基本问题来说是必要的。它还旨在解决应用问题，例如在地球温度和压力条件下建立岩石的物理参数和化学成分之间的关系。本文的目的是研究高温高压条件下化学成分对大陆和海洋岩石圈火成岩和变质岩弹性和密度特性的影响的特点。用超声脉冲法测定了大陆和海洋岩石圈岩石的弹性和密度特征。实验是在气缸-活塞型高压固相装置中进行的。该技术可在高达1.5-2.0GPa的高温和高压条件下对一个岩石样本进行一次实验，同时测定纵波和横波的速度和密度。基于对大陆和海洋岩石圈岩石弹性和密度特性的实验研究，该研究揭示了高温高压条件下这些参数与样品化学成分之间的定性联系。首次证实，所研究的岩石在氧化物对弹性波速和密度大小的影响方面表现出区域依赖性。因此，它们在某些领域随着压力的增加而增加，在另一些领域则减少。这种现象可以用物质原子结构的差异来解释。结果表明，在岩石圈剖面中，弹性波的速度和密度随深度的增加而增加。此外，岩石的化学成分从酸性变为中碱性，最后变为超碱性。岩石和矿物的化学成分与弹性和密度特性的关系使直接寻找固体矿物成为可能。

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GEODYNAMICS

Determining the physical parameters of geomaterials under high temperature and pressure conditions is necessary in connection with the fundamental issues of geology and geophysics. It is also aimed at solving applied problems, such as establishing relationships between physical parameters and chemical components of rocks under the earthly conditions of temperature and pressure. The purpose of the paper is to study the peculiarities of the influence of chemical components on the elastic and density properties of igneous and metamorphic rocks of the continental and oceanic lithosphere under high temperature and pressure conditions. The elastic and density characteristics of the rocks of the continental and oceanic lithosphere were determined by the ultrasonic pulse method. The experiments were carried out in a high-pressure solid-phase installation of a cylinder-piston type. The technique provides for the simultaneous determination of the longitudinal and transverse waves velocity and density in the course of one experiment on one rock sample at high temperature and pressure conditions up to 1.5-2.0 GPa. Based on an experimental study of the elastic and density properties of the rocks of the continental and oceanic lithosphere, the research revealed a qualitative connection between these parameters and chemical composition of the samples under high temperature and pressure conditions. It is first established that the studied rocks demonstrate regional dependence in the influence of oxides on the elastic wave velocity and density magnitude. Therefore they increase with the growing pressure in some areas, and decrease in others. This phenomenon is explained by the difference in the atomic structure of matter. It was revealed that in the section of the lithosphere, the speed and density of elastic waves increase with depth. Moreover, chemical composition of rocks changes from acid to medium, basic, and, finally, ultrabasic composition. The relationship of the chemical composition of rocks and minerals with elastic and density properties makes it possible to directly search for solid minerals.

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来源期刊

Geodynamics GEOCHEMISTRY & GEOPHYSICS-

自引率

33.30%

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