Rheology of synthetic polycrystalline halite in torsion

Marques, F.O.; Burg, Jean‐Pierre; Armann, M.; Martinho, E.

doi:10.1016/j.tecto.2012.10.024

Cited by 17 publications

(11 citation statements)

References 18 publications

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“…Specifically, our numerical microstructures (Figures , and ) and CPOs (Figure ) can be directly compared with the published torsion experiments of dry halite at 100 and 200°C by Armann () and Wenk et al (). Moreover, they are also in agreement with microstructures of torsion experiments by Marques et al (). Our calculated values of mean misorientation and subgrain misorientation statistics are qualitatively similar to those obtained with EBSD by Pennock et al () for dry halite deformed in coaxial conditions at 165 ± 10°C.…”

Section: Discussionsupporting

confidence: 92%

“…However, a whole new study would be required to verify this. Unfortunately, our misorientation data cannot be compared directly with those from torsion (simple shear) halite experiments, since Armann (), Wenk et al (), and Marques et al () did not quantify misorientation. Therefore, the strain gauge discussed here does not provide absolute values that can be directly applied to all natural case studies, because further benchmarking against experimental data is required for proper calibration.…”

Section: Discussionmentioning

confidence: 99%

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Subgrain Rotation Recrystallization During Shearing: Insights From Full‐Field Numerical Simulations of Halite Polycrystals

et al. 2017

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We present, for the first time, results of full‐field numerical simulations of subgrain rotation recrystallization of halite polycrystals during simple shear deformation. The series of simulations show how microstructures are controlled by the competition between (i) grain size reduction by creep by dislocation glide and (ii) intracrystalline recovery encompassing subgrain coarsening by coalescence through rotation and alignment of the lattices of neighboring subgrains. A strong grain size reduction develops in models without intracrystalline recovery, as a result of the formation of high‐angle grain boundaries when local misorientations exceed 15°. The activation of subgrain coarsening associated with recovery decreases the stored strain energy and results in grains with low intracrystalline heterogeneities. However, this type of recrystallization does not significantly modify crystal preferred orientations. Lattice orientation and grain boundary maps reveal that this full‐field modeling approach is able to successfully reproduce the evolution of dry halite microstructures from laboratory deformation experiments, thus opening new opportunities in this field of research. We demonstrate how the mean subgrain boundary misorientations can be used to estimate the strain accommodated by dislocation glide using a universal scaling exponent of about 2/3, as predicted by theoretical models. In addition, this strain gauge can be potentially applied to estimate the intensity of intracrystalline recovery, associated with temperature, using quantitative crystallographic analyses in areas with strain gradients.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Subgrain Rotation Recrystallization During Shearing: Insights From Full‐Field Numerical Simulations of Halite Polycrystals

et al. 2017

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“…Halite becomes exponentially weaker with increasing temperature [e.g., Franssen and Spiers , ; Marques et al , ], and at such depths and temperatures (probably ~200–400°C), the Hormuz salt itself is surely unable to host these aftershocks. However, the Hormuz salt is likely to flow along the basement‐cover interface in response to coseismic strain of the overlying Competent Group sediments.…”

Section: Discussionmentioning

confidence: 99%

Zagros “phantom earthquakes” reassessed—The interplay of seismicity and deep salt flow in the Simply Folded Belt?

et al. 2014

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Unraveling the contributions of main shock slip, aftershocks, aseismic afterslip, and postseismic relaxation to the deformation observed in earthquake sequences heightens our understanding of crustal rheology, triggering phenomena, and seismic hazard. Here, we revisit two recent earthquakes in the Zagros mountains (Iran) which exhibited unusual and contentious aftereffects. The M w ∼6 earthquakes at Qeshm (2005) and Fin (2006) are both associated with large interferometric synthetic aperture radar (InSAR) signals, consistent with slip on steep reverse faults in carbonate rocks of the middle sedimentary cover, but small aftershocks detected with local seismic networks were concentrated at significantly greater depths. This discrepancy can be interpreted in one of two ways: either (1) there is a genuine vertical separation between main shock and aftershocks, reflecting a complex stress state near the basement-cover interface, or (2) the aftershocks delimit the main shock slip and the InSAR signals were caused by shallow, updip afterslip (phantom earthquakes) with very similar magnitudes, mechanisms, and geographical positions as the original earthquakes. Here, we show that main shock centroid depths obtained from body waveform modeling-which in this instance is the only method that can reveal for certain the depth at which seismic slip was centered-strongly support the first interpretation. At Qeshm, microseismic aftershock depths are centered at the level of the Hormuz Formation, an Infracambrian sequence of intercalated evaporitic and nonevaporitic sediments. These aftershocks may reflect the breaking up of harder Hormuz sediments and adjacent strata as the salt flows in response to main shock strain at the base of the cover. This work bolsters recent suggestions that most large earthquakes in the Zagros are contained within carbonate rocks in the midlower sedimentary cover and that the crystalline basement shortens mostly aseismically.

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“…Low velocity parts can prevent continuing ruptures and in some cases transfer stress to adjacent faults (Nissen et al., 2014). The absence of large earthquakes in low velocity areas including salt compounds can be due to the operation of Halite at high temperatures, so that this compound loses its strength exponentially with increasing temperature (Marques et al., 2013) and as a result, structures including such composition at depth with a high temperature cannot be a host for occurrence large earthquakes (Nissen et al., 2014). The existence of small earthquakes within the LVZ (e.g., Figure 8, profile A1) can be because of the flow of salt along the lower bed due to the strain of the Competent group, which leads to low strength Halite forms with other sediments such as Anhydrite, Limestone, and Dolomite (Nissen et al., 2014).…”

Section: Discussionmentioning

confidence: 99%

High‐Resolution Local Earthquake Tomography Beneath the Zagros Simply Folded Belt (SFB): Implications for an Inhomogeneous Low‐Velocity Layer and Diapirism in the Upper Crust

Kianimehr,

Kissling,

Yaminifard

et al. 2023

Earth and Space Science

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Hormuz salt formation is considered the origin of the evaporated salt deposits in the Zagros and its ductile behavior has been known as the reason for the inhomogeneous deformation in the Zagros. However, our knowledge about this formation has been limited to the salt domes on the surface. In our study, local earthquakes recorded by a temporary dense seismological network of 17 stations, deployed in the southern margin of the Zagros Simply Folded Belt (SFB) in southwestern Iran, have been used for seismic imaging. The high‐resolution earthquake local tomography revealed the first geophysical evidence about the Hormuz salt layer and its extension at depth. There is an uneven layer located at a depth of 8–12 km as the origin of extruded salt in this region through a shear fault zone and the production of the Dashti Salt Dome at the Kuh‐e‐Namak Mountain. Based on the obtained results, this layer is characterized by low seismic velocity volumes with significant Vp/Vs ratio variations. The seismic image is also consistent with a major NW‐trending NE‐dipping reverse fault, probably responsible for the 9 April 2013 Kaki earthquake. At depth of around 4 km, smaller scale high velocity anomalies, characterized by a high Vp/Vs ratio, may be related to the fluid saturated sediments in the uppermost sedimentary layer.

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Rheology of synthetic polycrystalline halite in torsion

Cited by 17 publications

References 18 publications

Subgrain Rotation Recrystallization During Shearing: Insights From Full‐Field Numerical Simulations of Halite Polycrystals

Subgrain Rotation Recrystallization During Shearing: Insights From Full‐Field Numerical Simulations of Halite Polycrystals

Zagros “phantom earthquakes” reassessed—The interplay of seismicity and deep salt flow in the Simply Folded Belt?

High‐Resolution Local Earthquake Tomography Beneath the Zagros Simply Folded Belt (SFB): Implications for an Inhomogeneous Low‐Velocity Layer and Diapirism in the Upper Crust

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