Calcite Twin Formation, Measurement and Use as Stress–Strain Indicators: A Review of Progress over the Last Decade

Mechanical twins are common microstructures in deformed calcite. Calcite twins have been used for a long time as indicators of stress/strain orientations and magnitudes. Developments during the last decade point toward significant improvements of existing techniques as well as new applications of ca...

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Autores principales:	Olivier Lacombe, Camille Parlangeau, Nicolas E. Beaudoin, Khalid Amrouch
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	calcite twins critical resolved shear stress stress strain paleopiezometry Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/72542d78c985465aa9865ee96a3dbf5c
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spelling	oai:doaj.org-article:72542d78c985465aa9865ee96a3dbf5c2021-11-25T17:42:47ZCalcite Twin Formation, Measurement and Use as Stress–Strain Indicators: A Review of Progress over the Last Decade10.3390/geosciences111104452076-3263https://doaj.org/article/72542d78c985465aa9865ee96a3dbf5c2021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3263/11/11/445https://doaj.org/toc/2076-3263Mechanical twins are common microstructures in deformed calcite. Calcite twins have been used for a long time as indicators of stress/strain orientations and magnitudes. Developments during the last decade point toward significant improvements of existing techniques as well as new applications of calcite twin analysis in tectonic studies. This review summarises the recent progress in the understanding of twin formation, including nucleation and growth of twins, and discusses the concept of CRSS and its dependence on several factors such as strain, temperature and grain size. Classical and recent calcite twin measurement techniques are also presented and their pros and cons are discussed. The newly proposed inversion techniques allowing for the use of calcite twins as indicators of orientations and/or magnitudes of stress and strain are summarized. Benefits for tectonic studies are illustrated through the presentation of several applications, from the scale of the individual tectonic structure to the continental scale. The classical use of calcite twin morphology (e.g., thickness) as a straightforward geothermometer is critically discussed in the light of recent observations that thick twins do not always reflect deformation temperature above 170–200 °C. This review also presents how the age of twinning events in natural rocks can be constrained while individual twins cannot be dated yet. Finally, the review addresses the recent technical and conceptual progress in calcite twinning paleopiezometry, together with the promising combination of this paleopiezometer with mechanical analysis of fractures or stylolite roughness.Olivier LacombeCamille ParlangeauNicolas E. BeaudoinKhalid AmrouchMDPI AGarticlecalcite twinscritical resolved shear stressstressstrainpaleopiezometryGeologyQE1-996.5ENGeosciences, Vol 11, Iss 445, p 445 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	calcite twins critical resolved shear stress stress strain paleopiezometry Geology QE1-996.5
spellingShingle	calcite twins critical resolved shear stress stress strain paleopiezometry Geology QE1-996.5 Olivier Lacombe Camille Parlangeau Nicolas E. Beaudoin Khalid Amrouch Calcite Twin Formation, Measurement and Use as Stress–Strain Indicators: A Review of Progress over the Last Decade
description	Mechanical twins are common microstructures in deformed calcite. Calcite twins have been used for a long time as indicators of stress/strain orientations and magnitudes. Developments during the last decade point toward significant improvements of existing techniques as well as new applications of calcite twin analysis in tectonic studies. This review summarises the recent progress in the understanding of twin formation, including nucleation and growth of twins, and discusses the concept of CRSS and its dependence on several factors such as strain, temperature and grain size. Classical and recent calcite twin measurement techniques are also presented and their pros and cons are discussed. The newly proposed inversion techniques allowing for the use of calcite twins as indicators of orientations and/or magnitudes of stress and strain are summarized. Benefits for tectonic studies are illustrated through the presentation of several applications, from the scale of the individual tectonic structure to the continental scale. The classical use of calcite twin morphology (e.g., thickness) as a straightforward geothermometer is critically discussed in the light of recent observations that thick twins do not always reflect deformation temperature above 170–200 °C. This review also presents how the age of twinning events in natural rocks can be constrained while individual twins cannot be dated yet. Finally, the review addresses the recent technical and conceptual progress in calcite twinning paleopiezometry, together with the promising combination of this paleopiezometer with mechanical analysis of fractures or stylolite roughness.
format	article
author	Olivier Lacombe Camille Parlangeau Nicolas E. Beaudoin Khalid Amrouch
author_facet	Olivier Lacombe Camille Parlangeau Nicolas E. Beaudoin Khalid Amrouch
author_sort	Olivier Lacombe
title	Calcite Twin Formation, Measurement and Use as Stress–Strain Indicators: A Review of Progress over the Last Decade
title_short	Calcite Twin Formation, Measurement and Use as Stress–Strain Indicators: A Review of Progress over the Last Decade
title_full	Calcite Twin Formation, Measurement and Use as Stress–Strain Indicators: A Review of Progress over the Last Decade
title_fullStr	Calcite Twin Formation, Measurement and Use as Stress–Strain Indicators: A Review of Progress over the Last Decade
title_full_unstemmed	Calcite Twin Formation, Measurement and Use as Stress–Strain Indicators: A Review of Progress over the Last Decade
title_sort	calcite twin formation, measurement and use as stress–strain indicators: a review of progress over the last decade
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/72542d78c985465aa9865ee96a3dbf5c
work_keys_str_mv	AT olivierlacombe calcitetwinformationmeasurementanduseasstressstrainindicatorsareviewofprogressoverthelastdecade AT camilleparlangeau calcitetwinformationmeasurementanduseasstressstrainindicatorsareviewofprogressoverthelastdecade AT nicolasebeaudoin calcitetwinformationmeasurementanduseasstressstrainindicatorsareviewofprogressoverthelastdecade AT khalidamrouch calcitetwinformationmeasurementanduseasstressstrainindicatorsareviewofprogressoverthelastdecade
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Calcite Twin Formation, Measurement and Use as Stress–Strain Indicators: A Review of Progress over the Last Decade

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