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The Effect of the Garnet Content on Deformation Mechanisms and Weakening of Eclogite: Insights from Deformation Experiments and Numerical Simulations

Geochemistry, Geophysics, Geosystems(2023)

Univ Vienna

Cited 8|Views1
Abstract
AbstractWe performed deformation experiments on omphacite‐garnet aggregates at a temperature of 1000°C, a confining pressure of 2.5 GPa, and a strain rate of 3 × 10−6 s−1 and complemented them by numerical simulations to gain insight into the role of garnet fraction for the deformation behavior of dry eclogite, with a focus on strain weakening mechanisms. We determined the spatial and temporal evolution of strain and strain rate by basing numerical simulations on experimentally derived microstructures, and thereby identified characteristic deformation mechanisms. Pure omphacite and garnet aggregates deform by two different mechanisms. Internally strained clasts and low‐angle grain boundaries indicate crystal plasticity for omphacitite; the fracture dominated fabric of garnetite documents brittle deformation. Electron channeling contrast imaging, however, revealed low‐angle grain boundaries and free dislocations in garnet crystals, suggesting that minor crystal plasticity accompanies the brittle failure. Eclogitic aggregates show varying deformation behavior between the two end‐members shifting from crystal plastic toward brittle deformation with increasing garnet content. All samples exhibit strain weakening. The intensity of weakening shows a positive correlation with the garnet content. Our combined experimental, numerical, and microstructural investigations suggest that the majority of strain weakening is associated with crystal plastic processes in omphacite. Numerical simulations and experiments show that a garnet content above 25% enhances the activity of crystal plastic processes in omphacite and results in strain localization, which subsequently weakens the eclogite.
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Key words
eclogite deformation,deformation experiments,numerical simulation,microstructure analysis,strain weakening
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要点】:本文通过实验和数值模拟研究了石榴石含量对干态榴辉岩变形机制及弱化的影响,发现石榴石含量的增加会增强榴辉岩的应变弱化现象。

方法】:作者采用1000°C温度、2.5 GPa围压和3 × 10^-6 s^-1应变速率的变形实验,并结合数值模拟,分析不同石榴石含量的榴辉岩变形行为。

实验】:实验在干态榴辉岩的橄榄石-石榴石集合体上进行,使用电子通道对比成像技术观察了石榴石晶体的微结构,发现随着石榴石含量的增加,变形行为从晶格塑性向脆性变形转变,所有样本均表现出应变弱化,且弱化程度与石榴石含量正相关。