In-Situ Evolution of Calcite Twinning during Uniaxial Compression of Carrara Marble at Room Temperature
Calcite twinning is a dominant deformation mechanism at low temperatures. It is often used to reconstruct paleostresses: orientations of the principal stress axes, stress ratios and differential stress. Despite numerous studies, on single crystals and aggregates, questions remain about the initiatio...
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| Format: | Article |
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MDPI AG
2022-05-01
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| Series: | Geosciences |
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| Online Access: | https://www.mdpi.com/2076-3263/12/6/233 |
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| author | Camille Parlangeau Alexandre Dimanov Simon Hallais |
| author_facet | Camille Parlangeau Alexandre Dimanov Simon Hallais |
| author_sort | Camille Parlangeau |
| collection | DOAJ |
| description | Calcite twinning is a dominant deformation mechanism at low temperatures. It is often used to reconstruct paleostresses: orientations of the principal stress axes, stress ratios and differential stress. Despite numerous studies, on single crystals and aggregates, questions remain about the initiation and evolution of the twinning. In particular, the existence of a critical value for the activation of twin planes is debated. In this study, Carrara marble samples were uniaxially deformed at low temperature. The experiments were monitored in situ in an SEM (Scanning Electron Microscope) and a deformation analysis was performed at regular intervals using image correlation. Image correlation analysis shows the link between the overconcentration of strains and the appearance of the first twinned planes. This is followed by a densification and a gradual thickening of the twin lamellae. Fracturing only appears in a third stage as a precursor to the collapse of the sample. The inversion, using the CSIT-2 technique, showed that the twinned planes are globally related to the applied macroscopic stress. The inversion allows one to retrieve the macroscopic stress tensor. Schmid factors were extracted from this analysis and correlated to the loading curves. For crystals of about 200 µm diameter, the threshold value is in between 6.75 and 8.25 MPa. |
| first_indexed | 2024-03-09T23:41:51Z |
| format | Article |
| id | doaj.art-6775278762be480598f4aa24c792123b |
| institution | Directory Open Access Journal |
| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-03-09T23:41:51Z |
| publishDate | 2022-05-01 |
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| series | Geosciences |
| spelling | doaj.art-6775278762be480598f4aa24c792123b2023-11-23T16:49:51ZengMDPI AGGeosciences2076-32632022-05-0112623310.3390/geosciences12060233In-Situ Evolution of Calcite Twinning during Uniaxial Compression of Carrara Marble at Room TemperatureCamille Parlangeau0Alexandre Dimanov1Simon Hallais2Laboratoire de Mécanique des Solides, CNRS UMR 7649, École Polytechnique, 91128 Palaiseau, FranceLaboratoire de Mécanique des Solides, CNRS UMR 7649, École Polytechnique, 91128 Palaiseau, FranceLaboratoire de Mécanique des Solides, CNRS UMR 7649, École Polytechnique, 91128 Palaiseau, FranceCalcite twinning is a dominant deformation mechanism at low temperatures. It is often used to reconstruct paleostresses: orientations of the principal stress axes, stress ratios and differential stress. Despite numerous studies, on single crystals and aggregates, questions remain about the initiation and evolution of the twinning. In particular, the existence of a critical value for the activation of twin planes is debated. In this study, Carrara marble samples were uniaxially deformed at low temperature. The experiments were monitored in situ in an SEM (Scanning Electron Microscope) and a deformation analysis was performed at regular intervals using image correlation. Image correlation analysis shows the link between the overconcentration of strains and the appearance of the first twinned planes. This is followed by a densification and a gradual thickening of the twin lamellae. Fracturing only appears in a third stage as a precursor to the collapse of the sample. The inversion, using the CSIT-2 technique, showed that the twinned planes are globally related to the applied macroscopic stress. The inversion allows one to retrieve the macroscopic stress tensor. Schmid factors were extracted from this analysis and correlated to the loading curves. For crystals of about 200 µm diameter, the threshold value is in between 6.75 and 8.25 MPa.https://www.mdpi.com/2076-3263/12/6/233calcite twincritical resolved shear stressin-situ deformation experiment |
| spellingShingle | Camille Parlangeau Alexandre Dimanov Simon Hallais In-Situ Evolution of Calcite Twinning during Uniaxial Compression of Carrara Marble at Room Temperature Geosciences calcite twin critical resolved shear stress in-situ deformation experiment |
| title | In-Situ Evolution of Calcite Twinning during Uniaxial Compression of Carrara Marble at Room Temperature |
| title_full | In-Situ Evolution of Calcite Twinning during Uniaxial Compression of Carrara Marble at Room Temperature |
| title_fullStr | In-Situ Evolution of Calcite Twinning during Uniaxial Compression of Carrara Marble at Room Temperature |
| title_full_unstemmed | In-Situ Evolution of Calcite Twinning during Uniaxial Compression of Carrara Marble at Room Temperature |
| title_short | In-Situ Evolution of Calcite Twinning during Uniaxial Compression of Carrara Marble at Room Temperature |
| title_sort | in situ evolution of calcite twinning during uniaxial compression of carrara marble at room temperature |
| topic | calcite twin critical resolved shear stress in-situ deformation experiment |
| url | https://www.mdpi.com/2076-3263/12/6/233 |
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