In situ observation of crystallographic preferred orientation of deforming olivine at high pressure and high temperature

Ohuchi, Tomohiro; Nishihara, Yu; Seto, Yusuke; Kawazoe, Takaaki; Nishi, Masayuki; Maruyama, Genta; Hashimoto, Mika; Higo, Yuji; Funakoshi, K.; Suzuki, Akio; Kikegawa, Takumi; Irifune, Tetsuo

doi:10.1016/j.pepi.2015.04.004

Cited by 17 publications

(4 citation statements)

References 51 publications

(92 reference statements)

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“…A common approach to the uncertainty problem in the D‐DIA, which will take here, is to rely on relative measurement from stepping experiments within a given run over absolute measurement and to focus on sensitivity to pressure, the variable for which the D‐DIA is specialized. Thus, despite the level of uncertainty implied in Figure , relative measurements using the D‐DIA have provided important contributions to the discovery of a change in crystallographic‐preferred orientation near P = 5 GPa (Hilairet et al, ; Ohuchi et al, , , ; Raterron et al, , ), to the effect of water thereon, and to the numeric value of V* .…”

Section: Measurement Uncertainty In the D‐diamentioning

confidence: 99%

Measurement of Activation Volume for Creep of Dry Olivine at Upper‐Mantle Conditions

Dixon

Durham

2018

JGR Solid Earth

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Olivine is the most abundant and among the weakest phases in Earth's upper mantle, and thus, its rheological properties play a critical role in governing thermal structure and convective flow in the upper mantle. A persistent obstacle to constraining the in situ flow properties of olivine by laboratory experiment has been the difficulty in resolving the effect of pressure, which is weak within the 0‐ to ~2‐GPa pressure range of conventional laboratory deformation instruments but potentially strong over the 1‐ to ~14‐GPa range of the upper mantle. Using a deformation‐DIA, one of a new generation of bonafide deformation devices designed for operation to ≥10 GPa, we have deformed dry, polycrystalline San Carlos olivine in high‐temperature creep with the singular intent of providing the best achievable measurement of activation volume V* and a comprehensive statement of uncertainty. Under strictly dry conditions, at constant temperature (1,373 K) and strain rate (1 × 10−5 s−1), varying only pressure (1.8 to 8.8 GPa), we measure V* = 15 ± 5 cm3/mol. We have reproduced the well‐known mechanism change from [100]‐slip to [001]‐slip near 5 GPa and determined that, whatever the change in V* associated with the change in slip system, the effective value of 15 ± 5 cm3/mol is still accurate for modeling purposes in the 2‐ to 9‐GPa pressure range. This is a substantial pressure effect, which in the absence of a temperature gradient would represent a viscosity increase from the top to bottom of the upper mantle of 5 ± 2 orders of magnitude.

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Section: Measurement Uncertainty In the D‐diamentioning

confidence: 99%

Measurement of Activation Volume for Creep of Dry Olivine at Upper‐Mantle Conditions

Dixon

Durham

2018

JGR Solid Earth

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“…It is marked by a [010] axis maxima parallel to the shortening direction and a [001] girdle normal to that same direction. Such a texture is common for samples deformed at high stress in pure shear [32,33].…”

Section: Slow Spinel Growth and Transformational Faultingmentioning

confidence: 99%

Ductile vs. Brittle Strain Localization Induced by the Olivine–Ringwoodite Transformation

et al. 2022

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As it descends into the Earth’s mantle, the olivine that constitutes the lithosphere of subducting slabs transforms to its high-pressure polymorphs, wadsleyite and ringwoodite, in the so-called transition zone. These transformations have important rheological consequences, since they may induce weakening, strain localization, and, in some cases, earthquakes. In this study, germanium olivine (Ge-olivine) was used as an analogue material to investigate the rheology of samples undergoing the olivine–ringwoodite transformation. Ge-olivine adopts a ringwoodite structure at pressures ~14 GPa lower than its silicate counterpart does, making the transformation accessible with a Griggs rig. Deformation experiments were carried out in a new-generation Griggs apparatus, where micro-seismicity was recorded in the form of acoustic emissions. A careful analysis of the obtained acoustic signal, combined with an extensive microstructure analysis of the recovered samples, provided major insights into the interplay between transformation and deformation mechanisms. The results show that significant reaction rates cause a weakening via the implementation of ductile shear zones that can be preceded by small brittle precursors. When kinetics are more sluggish, mechanical instabilities lead to transformational faulting, which stems from the unstable propagation of shear bands localizing both strain and transformation. The growth of these shear bands is self-sustained thanks to the negative volume change and the exothermic nature of the reaction, and leads to dynamic rupture, as attested by the acoustic emissions recorded. These micro-earthquakes share striking similarities with deep focus earthquakes, which may explain several seismological observations such as magnitude frequency relations and the occurrence of deep repeating earthquakes and foreshocks.

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“…Recently, more experiments were performed on the deformation of olivine aggregates at high pressure under wet and dry conditions Irifune, 2013, 2014;Ohuchi et al, 2015). To compare the olivine CPOs in those studies, one needs to pay attention to the measurement of olivine water content.…”

Section: Effect Of Pressure On the Cpos Of Olivinementioning

confidence: 99%

Erratum to: Crystal preferred orientations of olivine, orthopyroxene, serpentine, chlorite, and amphibole, and implications for seismic anisotropy in subduction zones: a review

Jung

2018

Geosci J

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There are errors in the article entitled "Crystal preferred orientations of olivine, orthopyroxene, serpentine, chlorite, and amphibole, and implications for seismic anisotropy in subduction zones: a review" by Haemyeong Jung, which appeared on pages 985-1011 of the December issue in 2017. The author has provided a corrected article which is attached at the end of this erratum. ABSTRACT:This study provides a comprehensive review of the crystal preferred orientation (CPO) of olivine and orthopyroxene in the upper mantle, and of several hydrous minerals in the mantle wedge and at the slab-mantle interface. It discusses the seismic anisotropy of those minerals. Water-induced CPOs of olivine produced by previous experimental studies under high pressure and temperature conditions were found in many natural rocks. It is emphasized that the strong CPOs of hydrous minerals such as serpentine, chlorite, and amphibole, play an important role in interpreting the anomalously strong seismic anisotropy observed in subduction zones.

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In situ observation of crystallographic preferred orientation of deforming olivine at high pressure and high temperature

Cited by 17 publications

References 51 publications

Measurement of Activation Volume for Creep of Dry Olivine at Upper‐Mantle Conditions

Measurement of Activation Volume for Creep of Dry Olivine at Upper‐Mantle Conditions

Ductile vs. Brittle Strain Localization Induced by the Olivine–Ringwoodite Transformation

Erratum to: Crystal preferred orientations of olivine, orthopyroxene, serpentine, chlorite, and amphibole, and implications for seismic anisotropy in subduction zones: a review

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