在各种岩石类型的球形样本上测量的 P 波速度各向异性数据集,以及对斜长岩和橄榄岩中与逆冲有关的变化进行数据分析的实例

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Journal of Geodynamics Pub Date : 2024-04-08 DOI:10.1016/j.jog.2024.102032
Martin Staněk, Matěj Machek, Vladimír Kusbach, Barbora Píšová
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引用次数: 0

摘要

本文介绍了在 132 个独立方向和高达 400 兆帕的约束压力下对 152 个球形样品测量的超声波 P 波速度数据集。样品包括来自不同地质环境的沉积岩、变质岩和火成岩,以及石英和斜长石的单晶体。测量的 P 波速度数据附有测量的岩石密度、计算的 P 波速度各向异性以及在光学显微镜下观察到的岩相特性。以数据集中的一组 27 个斜长岩样本和一组 23 个橄榄岩和辉长岩样本为例,展示了对数据集内容的分析和解释。研究了斜长岩、橄榄岩和辉长岩中的逆冲对岩石弹性特性的影响。斜长岩逆冲在早期阶段对 P 波速度的影响有限。辉绿岩的逆冲过程与密度和 P 波速度的逐渐降低有关。与辉石共斜化相比较,石榴石的鳞片化对 P 波速度的影响更为明显。与密度急剧下降相关的蛇纹石化过程反映为 P 波速度的明显下降,而与岩石类型无关。分析样品集的 P 波速度各向异性主要取决于原岩微观结构或后期发育的孔隙空间。两种岩石类型的孔隙空间几何形状都是由开放的微裂缝造成的,这一点可以通过增加约束压力时测量的 P 波速度差异得到证明。
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Dataset of P-wave velocity anisotropy measured on spherical samples of various rock types with an example of data analysis of retrogression related changes in eclogite and peridotite

A dataset of ultrasound P-wave velocity measured in 132 independent directions and at confining pressure up to 400 MPa on 152 spherical samples is presented. The samples include sedimentary, metamorphic and igneous rocks from various geological settings and single crystals of quartz and plagioclase. The measured P-wave velocity data are accompanied by measured rock densities, calculated P-wave velocity anisotropies and by petrographic properties observed under the optical microscope. An example of analysis and interpretation of the dataset content is shown on a set of 27 eclogite samples and a set of 23 peridotite and pyroxenite samples included in the dataset. The impact of retrogression in eclogites and in peridotites and pyroxenites on the rock elastic properties is investigated. The eclogite retrogression has at its early stages only limited influence on the P-wave velocity. The progress of retrogression in eclogite is associated with gradual decrease in density and P-wave velocity. A more significant influence on P-wave velocity has been observed for the kelyphitization of garnet than for the pyroxene symplectitization. The serpentinization process associated with rapid density decrease is reflected by distinct decrease of P-wave velocity regardless of the rock type. The P-wave velocity anisotropy of analyzed sample sets is mostly dependent on the primary rock microstructure or on the later developed pore space. The pore space geometry documented by differences of P-wave velocity measured at increasing confining pressure is attributed to open microcracks in both rock types.

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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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