Texture Development and Stress–Strain Partitioning in Periclase + Halite Aggregates

Lin, Fan‐Chi; Giannetta, Max G.; Jugle, Mike; Couper, Samantha; Dunleavy, Becky; Miyagi, Lowell

doi:10.3390/min9110679

Cited by 6 publications

(3 citation statements)

References 58 publications

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“…Exploring the contribution of mineral properties to these phenomena has largely relied on x-ray diffraction techniques on powders using diamond anvil cells (DACs) combined with increasingly sophisticated laser heating methods to bring minerals to the conditions of the full range of the Earth's pressure-temperature conditions (5)(6)(7)(8). Ex situ methods such as transmission electron microscopy (TEM) (9) have also been used, which provide increased resolution but must be performed at ambient conditions and generally use analog materials (10) that may take the same structure as minerals deep within the Earth but have different chemistry and properties. Although these techniques have laid the groundwork for understanding the structure and properties of lower mantle constituents, they lack the mesoscale resolution (spanning 1 to 100 m) (11) required to investigate multiphase aggregates in situ during dynamic events, such as phase transitions and recrystallization.…”

Section: Introductionmentioning

confidence: 99%

Exploring microstructures in lower mantle mineral assemblages with synchrotron x-rays

et al. 2021

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Understanding dynamics across phase transformations and the spatial distribution of minerals in the lower mantle is crucial for a comprehensive model of the evolution of the Earth’s interior. Using the multigrain crystallography technique (MGC) with synchrotron x-rays at pressures of 30 GPa in a laser-heated diamond anvil cell to study the formation of bridgmanite [(Mg,Fe)SiO3] and ferropericlase [(Mg,Fe)O], we report an interconnected network of a smaller grained ferropericlase, a configuration that has been implicated in slab stagnation and plume deflection in the upper part of the lower mantle. Furthermore, we isolated individual crystal orientations with grain-scale resolution, provide estimates on stress evolutions on the grain scale, and report {110} twinning in an iron-depleted bridgmanite, a mechanism that appears to aid stress relaxation during grain growth and likely contributes to the lack of any appreciable seismic anisotropy in the upper portion of the lower mantle.

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Section: Introductionmentioning

confidence: 99%

Exploring microstructures in lower mantle mineral assemblages with synchrotron x-rays

et al. 2021

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“…Deformation of pseudocubic CaGeO 3 perovskite and MgO in the D-DIA apparatus results in texture development in both phases (Wang et al, 2013). Similarly, two-phase deformation experiments on cubic MgO and a soft NaCl phase in a DAC over a range of phase proportions shows texturing in both phases, however a few phase proportions do show anomalous textures in NaCl (Lin et al, 2019). Thus, it appears that texturing in a two-phase aggregate likely depends on phase volume proportions, strength contrast, and on the symmetry and plastic anisotropy of the phases involved.…”

Section: Plastic Strain In Ferropericlasementioning

confidence: 88%

Does Heterogeneous Strain Act as a Control on Seismic Anisotropy in Earth’s Lower Mantle?

et al. 2020

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Plastic deformation and texture development in minerals of the lower mantle can result in seismic anisotropy, and studying deformation of lower mantle materials is therefore important for interpreting lower mantle flow. Most previous deformation experiments documenting texture development at lower mantle pressures have been conducted on single-phase samples and/or at room temperature. However, real rocks deform at high temperature and are poly-phase and deformation is therefore likely different from that of a single phase. Here we report on high temperature diamond anvil cell deformation experiments on a multiphase assemblage of bridgmanite, ferropericlase, and ringwoodite compressed from ∼28 to ∼39 GPa and resistively heated at a constant temperature of 1,000 K. We employ the elasto-viscoplastic self-consistent method to model both texture and lattice strain of bridgmanite as a function of deformation mechanisms. Simulations indicate deformation of bridgmanite is accommodated by about half of slip activity on (100)[010] with the remainder split between (100)[001] and/or (100)〈011〉. Texture in bridgmanite is consistent with most seismic observations in the lowermost mantle. Although there is texture development in both bridgmanite and ringwoodite, ferropericlase does not develop coherent texture throughout the course of the experiment. Analysis of lattice strains suggests that the lack of coherent texture development in ferropericlase is due to heterogeneous plastic deformation resulting from microstructural interactions imposed by other phases. Variations in texturing of bridgmanite and ferropericlase could therefore cause laterally varying, complex anisotropy. Our models for binary mantle-like mixtures of bridgmanite and ferropericlase show that changes in strain and texture partitioning can explain the range of observed lower mantle anisotropies.

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“…A number of studies have taken advantage of high‐pressure deformation experiments with in situ synchrotron X‐ray measurements in two‐phase mineralogical assemblages, which allow to investigate the stress partitioning between the different phases (Farla et al., 2017; Girard et al., 2016; Kaercher et al., 2016; Li et al., 2007; Lin et al., 2019; Tokle et al., 2021; Wang et al., 2013). We present here an experimental study of the effect of serpentine fraction within a mixture of olivine + antigorite, on the mechanical behavior of the aggregate.…”

Section: Introductionmentioning

confidence: 99%

Stress Balance in Synthetic Serpentinized Peridotites Deformed at Subduction Zone Pressures

Hilairet,

Guignard,

Ferrand

et al. 2024

JGR Solid Earth

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Weak serpentine minerals affect the mechanical behavior of serpentinized peridotites at depth, and may play a significant role in deformation localization within subduction zones, at local or regional scale. Mixtures of olivine with 5, 10, 20 and 50 vol. % fraction of antigorite, proxies for serpentinized peridotites, were deformed in axial shortening geometry under high pressures (ca. 2–5 GPa) and moderate temperatures (ca. 350°C), with in situ stress and strain measurements using synchrotron X‐rays. We evaluate the average partitioning of stresses at the grains scale within each phase (mineral) of the aggregate and compare with pure olivine aggregates in the same conditions. The in situ stress balance is different between low antigorite contents up to 10 vol. %, and higher contents above 20 vol. %. Microstructure and stress levels suggest the deformation mechanisms under these experimental conditions are akin to (semi)brittle and frictional processes. Unlike when close to dehydration temperatures, hardening of the aggregate is observed at low serpentine fractions, due to an increase in local stress concentrations. Below and above the 10–20 vol. % threshold, the stress state in the aggregate corresponds to friction laws already measured for pure olivine aggregates and pure antigorite aggregates respectively. As expected, the behavior of the two‐phase aggregate does not evolve as calculated from simple iso‐stress or iso‐strain bounds, and calls for more advanced physical models of two‐phase mixtures.

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Texture Development and Stress–Strain Partitioning in Periclase + Halite Aggregates

Abstract: Keywords: multiphase deformation; high pressure; texture; plasticity modeling

Cited by 6 publications

References 58 publications

Exploring microstructures in lower mantle mineral assemblages with synchrotron x-rays

Exploring microstructures in lower mantle mineral assemblages with synchrotron x-rays

Does Heterogeneous Strain Act as a Control on Seismic Anisotropy in Earth’s Lower Mantle?

Stress Balance in Synthetic Serpentinized Peridotites Deformed at Subduction Zone Pressures

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