沙特阿拉伯西北阿拉伯地盾哈马达特岩芯群的应变分析和微结构研究

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geotectonics Pub Date : 2024-04-18 DOI:10.1134/s0016852124700079
M. H. Al-Hashim, O. M. K. Kassem
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引用次数: 0

摘要

摘要 本研究说明了位于米迪亚地层的哈马达特岩芯复合体的结构环境。了解不同尺度的变形过程和产物至关重要,而这取决于有限应变的计算。为了评估哈马达特岩芯群的构造发展和结构,我们采用了实地考察、有限应变分析和微结构检查等方法。哈马达特岩芯群采用了长石和黑云母晶粒的 Rf/φ 和 Fry 技术,采集了 24 个样品,包括片麻岩、Zaam 组和 Baydah 组的变火山沉积岩、Jar-Salajah 侵入体的变形花岗闪长岩和 Qazzaz 花岗岩。根据有限应变数据,各种岩石单元具有中度到高度变形,XZ 断面的轴向比(Rf/φ 技术)从 1.80 到 4.50 不等,而 Fry 技术则从 2.10 到 7.40 不等。其结论是,缩短轴显示出与亚水平褶皱相关的亚垂直褶皱。应变数据具有相同的主相褶皱和相似的变形行为。在这种情况下,通过高压变质作用获得的有限应变表明,岩层的接触是通过韧性应变的积累而形成的。此外,在整个变形过程中的推力和侵入过程中,脆性变形到韧性变形的建立主要是由研究区域的纯剪切引起的。
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Strain Analysis and Microstructural Study of Hamadat Core Complex, Northwestern Arabian Shield, Saudi Arabia

Abstract

The present work illustrates the structural setting in the Hamadat core complex, which located in the Midyan terrane. It is essential to understand deformational processes and products at different scales, which depend on the calculation of finite strain. To assess the tectonic development and structures in the Hamadat core complex, we use field investigation, finite strain analysis and microstructural examination. The Hamadat core complex employed the Rf/φ and Fry techniques for feldspar and mafic grains with 24 collected samples for gneisses, metavolcano-sedimentary rocks from both the Zaam and Baydah groups, deformed granodiorite for Jar-Salajah intrusion and Qazzaz granite. According to finite-strain data, the various rock units have moderate to high degree of deformation, and the axial ratios for XZ section vary from 1.80 to 4.50 for the Rf/φ technique and from 2.10 to 7.40 for the Fry technique. It concluded that the shortening axes display the subvertical related to the subhorizontal foliation. The strain data have the same main-phase foliation and similar deformation behavior. Finite strain acquired through high pressure metamorphism in this instance suggested that the contacts of nappe developed through the buildup of ductile strains. Also, during thrusting and intrusions throughout the deformation process, a building of brittle to ductile deformation was mostly caused by pure shearing in the study area.

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来源期刊
Geotectonics
Geotectonics 地学-地球化学与地球物理
CiteScore
1.90
自引率
9.10%
发文量
28
审稿时长
3 months
期刊介绍: Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.
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