Strength of Dry and Wet Quartz in the Low-Temperature Plasticity Regime: Insights From Nanoindentation

Alberto Ceccato; Luca Menegon; Lars N. Hansen

doi:10.1029/2021GL094633

Strength of Dry and Wet Quartz in the Low-Temperature Plasticity Regime: Insights From Nanoindentation

Alberto Ceccato, Luca Menegon, Lars N. Hansen

Earth and Environmental Sciences-Twin Cities

Research output: Contribution to journal › Letter › peer-review

Abstract

At low-temperature and high-stress conditions, quartz deformation is controlled by the kinetics of dislocation glide, that is, low-temperature plasticity (LTP). To investigate the relationship between intracrystalline H₂O content and the yield strength of quartz LTP, we have integrated spherical and Berkovich nanoindentation tests at room temperature on natural quartz with electron backscatter diffraction and secondary-ion mass spectrometry measurements of intracrystalline H₂O content. Dry (<20 wt ppm H₂O) and wet (20–100 wt ppm H₂O) crystals exhibit comparable indentation hardness. Quartz yield strength, which is proportional to indentation hardness, seems to be unaffected by the intracrystalline H₂O content when deformed under room temperature, high-stress conditions. Pre-indentation intracrystalline microstructure may have provided a high density of dislocation sources, influencing the first increments of low-temperature plastic strains. Our results have implications for fault strength at the frictional-viscous transition and during transient deformation by LTP, such as seismogenic loading and post-seismic creep.

Original language	English (US)
Article number	e2021GL094633
Journal	Geophysical Research Letters
Volume	49
Issue number	2
DOIs	https://doi.org/10.1029/2021GL094633
State	Published - Jan 28 2022

Bibliographical note

Funding Information:
This study was supported by the FP7 Marie Curie CIG “EVOCOS” to LM. Cees‐Jan De Hoog and the staff at the NERC Ion Microprobe Facility in Edinburgh are thanked for their support. The Authors thank Phil Skemer, Ben Strozewski, and Christopher Thom for fruitful discussions, and the two anonymous reviewers who provided very constructive comments and inputs. The authors declare they have no perceived financial conflicts of interests with respect to the results of this paper. Open access funding provided by Universita degli Studi di Bologna within the CRUI‐CARE Agreement.

Funding Information:
This study was supported by the FP7 Marie Curie CIG ?EVOCOS? to LM. Cees-Jan De Hoog and the staff at the NERC Ion Microprobe Facility in Edinburgh are thanked for their support. The Authors thank Phil Skemer, Ben Strozewski, and Christopher Thom for fruitful discussions, and the two anonymous reviewers who provided very constructive comments and inputs. The authors declare they have no perceived financial conflicts of interests with respect to the results of this paper. Open access funding provided by Universita degli Studi di Bologna within the CRUI-CARE Agreement.

Publisher Copyright:
© 2022. The Authors.

Keywords

dislocation glide
hydrolytic weakening
low-temperature plasticity
nanoindentation
quartz

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10.1029/2021GL094633

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title = "Strength of Dry and Wet Quartz in the Low-Temperature Plasticity Regime: Insights From Nanoindentation",

abstract = "At low-temperature and high-stress conditions, quartz deformation is controlled by the kinetics of dislocation glide, that is, low-temperature plasticity (LTP). To investigate the relationship between intracrystalline H2O content and the yield strength of quartz LTP, we have integrated spherical and Berkovich nanoindentation tests at room temperature on natural quartz with electron backscatter diffraction and secondary-ion mass spectrometry measurements of intracrystalline H2O content. Dry (<20 wt ppm H2O) and wet (20–100 wt ppm H2O) crystals exhibit comparable indentation hardness. Quartz yield strength, which is proportional to indentation hardness, seems to be unaffected by the intracrystalline H2O content when deformed under room temperature, high-stress conditions. Pre-indentation intracrystalline microstructure may have provided a high density of dislocation sources, influencing the first increments of low-temperature plastic strains. Our results have implications for fault strength at the frictional-viscous transition and during transient deformation by LTP, such as seismogenic loading and post-seismic creep.",

keywords = "dislocation glide, hydrolytic weakening, low-temperature plasticity, nanoindentation, quartz",

author = "Alberto Ceccato and Luca Menegon and Hansen, {Lars N.}",

note = "Funding Information: This study was supported by the FP7 Marie Curie CIG “EVOCOS” to LM. Cees‐Jan De Hoog and the staff at the NERC Ion Microprobe Facility in Edinburgh are thanked for their support. The Authors thank Phil Skemer, Ben Strozewski, and Christopher Thom for fruitful discussions, and the two anonymous reviewers who provided very constructive comments and inputs. The authors declare they have no perceived financial conflicts of interests with respect to the results of this paper. Open access funding provided by Universita degli Studi di Bologna within the CRUI‐CARE Agreement. Funding Information: This study was supported by the FP7 Marie Curie CIG ?EVOCOS? to LM. Cees-Jan De Hoog and the staff at the NERC Ion Microprobe Facility in Edinburgh are thanked for their support. The Authors thank Phil Skemer, Ben Strozewski, and Christopher Thom for fruitful discussions, and the two anonymous reviewers who provided very constructive comments and inputs. The authors declare they have no perceived financial conflicts of interests with respect to the results of this paper. Open access funding provided by Universita degli Studi di Bologna within the CRUI-CARE Agreement. Publisher Copyright: {\textcopyright} 2022. The Authors.",

year = "2022",

month = jan,

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doi = "10.1029/2021GL094633",

language = "English (US)",

volume = "49",

journal = "Geophysical Research Letters",

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T2 - Insights From Nanoindentation

AU - Ceccato, Alberto

AU - Menegon, Luca

AU - Hansen, Lars N.

N1 - Funding Information: This study was supported by the FP7 Marie Curie CIG “EVOCOS” to LM. Cees‐Jan De Hoog and the staff at the NERC Ion Microprobe Facility in Edinburgh are thanked for their support. The Authors thank Phil Skemer, Ben Strozewski, and Christopher Thom for fruitful discussions, and the two anonymous reviewers who provided very constructive comments and inputs. The authors declare they have no perceived financial conflicts of interests with respect to the results of this paper. Open access funding provided by Universita degli Studi di Bologna within the CRUI‐CARE Agreement. Funding Information: This study was supported by the FP7 Marie Curie CIG ?EVOCOS? to LM. Cees-Jan De Hoog and the staff at the NERC Ion Microprobe Facility in Edinburgh are thanked for their support. The Authors thank Phil Skemer, Ben Strozewski, and Christopher Thom for fruitful discussions, and the two anonymous reviewers who provided very constructive comments and inputs. The authors declare they have no perceived financial conflicts of interests with respect to the results of this paper. Open access funding provided by Universita degli Studi di Bologna within the CRUI-CARE Agreement. Publisher Copyright: © 2022. The Authors.

PY - 2022/1/28

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N2 - At low-temperature and high-stress conditions, quartz deformation is controlled by the kinetics of dislocation glide, that is, low-temperature plasticity (LTP). To investigate the relationship between intracrystalline H2O content and the yield strength of quartz LTP, we have integrated spherical and Berkovich nanoindentation tests at room temperature on natural quartz with electron backscatter diffraction and secondary-ion mass spectrometry measurements of intracrystalline H2O content. Dry (<20 wt ppm H2O) and wet (20–100 wt ppm H2O) crystals exhibit comparable indentation hardness. Quartz yield strength, which is proportional to indentation hardness, seems to be unaffected by the intracrystalline H2O content when deformed under room temperature, high-stress conditions. Pre-indentation intracrystalline microstructure may have provided a high density of dislocation sources, influencing the first increments of low-temperature plastic strains. Our results have implications for fault strength at the frictional-viscous transition and during transient deformation by LTP, such as seismogenic loading and post-seismic creep.

AB - At low-temperature and high-stress conditions, quartz deformation is controlled by the kinetics of dislocation glide, that is, low-temperature plasticity (LTP). To investigate the relationship between intracrystalline H2O content and the yield strength of quartz LTP, we have integrated spherical and Berkovich nanoindentation tests at room temperature on natural quartz with electron backscatter diffraction and secondary-ion mass spectrometry measurements of intracrystalline H2O content. Dry (<20 wt ppm H2O) and wet (20–100 wt ppm H2O) crystals exhibit comparable indentation hardness. Quartz yield strength, which is proportional to indentation hardness, seems to be unaffected by the intracrystalline H2O content when deformed under room temperature, high-stress conditions. Pre-indentation intracrystalline microstructure may have provided a high density of dislocation sources, influencing the first increments of low-temperature plastic strains. Our results have implications for fault strength at the frictional-viscous transition and during transient deformation by LTP, such as seismogenic loading and post-seismic creep.

KW - dislocation glide

KW - hydrolytic weakening

KW - low-temperature plasticity

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KW - quartz

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JO - Geophysical Research Letters

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SN - 0094-8276

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M1 - e2021GL094633

ER -

Strength of Dry and Wet Quartz in the Low-Temperature Plasticity Regime: Insights From Nanoindentation

Abstract

Bibliographical note

Keywords

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