日本北海道霍罗曼橄榄岩杂岩中橄榄石晶体结构的变化及其地震各向异性

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Kazuki Matsuyama , Katsuyoshi Michibayashi
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引用次数: 0

摘要

对日本北海道日高变质带霍罗曼橄榄岩杂岩进行了大面积(6 ×5 km)的微观结构和晶体结构研究。分析了13个橄榄岩样品的橄榄石和正辉石晶粒尺寸、织物强度(j指数)和晶体优选取向(CPOs)。橄榄石和正辉石的平均晶粒尺寸分别为295 ~ 497µm和257 ~ 537µm。橄榄石织物强度值由下往上递减,而正辉石织物强度值无系统变化趋势。橄榄岩含有三种不同的橄榄石CPOs,以前被称为A、E和AG型。结合前人的研究,我们发现橄榄石CPOs从南向北呈现E型到a型再到AG型的过渡性分布。南部杂岩基底发育E型橄榄岩,说明杂岩基底可能存在局部水侵。研究区中部以A型橄榄岩为主,北部以AG型橄榄岩为主。此外,我们还计算了橄榄石100%集合体和橄榄石与正辉石混合集合体的地震性质。结果表明,正辉石CPOs在不改变纵波传播模式的情况下,降低了橄榄岩的纵波各向异性(0.2 ~ 2.2%)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Variation in olivine crystal-fabrics and their seismic anisotropies in the Horoman peridotite complex, Hokkaido, Japan

We examined the microstructures and crystal-fabrics of peridotites within a large area (6 ×5 km) of the Horoman peridotite pomplex in the Hidaka metamorphic belt of Hokkaido, Japan. Thirteen peridotite samples were analyzed for olivine and orthopyroxene grain sizes, fabric strength (J-index), and crystallographic preferred orientations (CPOs). Mean grain sizes of olivine and orthopyroxene were ranged in 295–497 µm and in 257–537 µm, respectively. The olivine fabric strength values decreased from the lower to the upper part of the complex, whereas the orthopyroxene fabric strength values showed no systematic trends. The peridotites contained three different olivine CPOs, previously known as A, E, and AG types. Combined with a previous study, we found that olivine CPOs showed a transitional distribution from E to A to AG type from south to north. E type peridotites occur at the basement of the complex in the south, suggesting that local water infiltration might occur at the basement of the complex. The A type peridotites occurred mainly in the middle of the studied area and subsequently the AG type peridotites occurred towards the north. Moreover, we calculated the seismic properties of peridotite as olivine 100% aggregates and mixed (olivine and orthopyroxene) aggregates. It showed that orthopyroxene CPOs reduce P-wave anisotropies of peridotite (0.2–2.2%) without modification of the P-wave propagation patterns.

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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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