Characteristics, origin and significance of chessboard subgrain boundaries in the WAIS divide ice core
Observation of thin sections of the WAIS (West Antarctic Ice Sheet) Divide ice core in cross-polarized light reveals a wealth of microstructures and textural characteristics indicative of strain and recovery in an anisotropic crystalline substance undergoing high-temperature plastic deformation. The...
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Cambridge University Press
2025-01-01
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| Series: | Annals of Glaciology |
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| Online Access: | https://www.cambridge.org/core/product/identifier/S0260305524000193/type/journal_article |
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| author | Joan J. Fitzpatrick Larry A. Wilen Donald E. Voigt Richard B. Alley John M. Fegyveresi |
| author_facet | Joan J. Fitzpatrick Larry A. Wilen Donald E. Voigt Richard B. Alley John M. Fegyveresi |
| author_sort | Joan J. Fitzpatrick |
| collection | DOAJ |
| description | Observation of thin sections of the WAIS (West Antarctic Ice Sheet) Divide ice core in cross-polarized light reveals a wealth of microstructures and textural characteristics indicative of strain and recovery in an anisotropic crystalline substance undergoing high-temperature plastic deformation. The appearance of abundant subgrain domains—relatively strain-free regions inside crystals (grains) surrounded by walls of dislocations across which small structural orientation changes occur—is particularly noticeable in the depth range associated with the brittle ice (∼650–1300 m). Here we describe a subgrain texture, not previously reported in ice, that resembles chessboard-pattern subgrains in β-quartz. This chessboard texture at WAIS Divide is strongly associated with the presence of bubbles. We hypothesize that chessboard-subgrain development may affect grain-size evolution, the fracture of ice cores recovered from the brittle ice zone and perhaps grain-boundary sliding as well. |
| format | Article |
| id | doaj-art-96e46160c1cb4b36b01c8756b64323f4 |
| institution | Matheson Library |
| issn | 0260-3055 1727-5644 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Cambridge University Press |
| record_format | Article |
| series | Annals of Glaciology |
| spelling | doaj-art-96e46160c1cb4b36b01c8756b64323f42025-07-23T10:48:19ZengCambridge University PressAnnals of Glaciology0260-30551727-56442025-01-016610.1017/aog.2024.19Characteristics, origin and significance of chessboard subgrain boundaries in the WAIS divide ice coreJoan J. Fitzpatrick0https://orcid.org/0000-0002-2840-2947Larry A. Wilen1Donald E. Voigt2Richard B. Alley3https://orcid.org/0000-0003-1833-0115John M. Fegyveresi4https://orcid.org/0000-0002-1029-6277Geosciences and Environmental Change Science Center, U.S. Geological Survey, Denver, CO, USAMechanical Engineering and Materials Science, Yale University, New Haven, CT, USADepartment of Geosciences, The Pennsylvania State University, University Park, PA, USADepartment of Geosciences, The Pennsylvania State University, University Park, PA, USASchool of Earth and Sustainability, Northern Arizona University, Flagstaff, AZ, USAObservation of thin sections of the WAIS (West Antarctic Ice Sheet) Divide ice core in cross-polarized light reveals a wealth of microstructures and textural characteristics indicative of strain and recovery in an anisotropic crystalline substance undergoing high-temperature plastic deformation. The appearance of abundant subgrain domains—relatively strain-free regions inside crystals (grains) surrounded by walls of dislocations across which small structural orientation changes occur—is particularly noticeable in the depth range associated with the brittle ice (∼650–1300 m). Here we describe a subgrain texture, not previously reported in ice, that resembles chessboard-pattern subgrains in β-quartz. This chessboard texture at WAIS Divide is strongly associated with the presence of bubbles. We hypothesize that chessboard-subgrain development may affect grain-size evolution, the fracture of ice cores recovered from the brittle ice zone and perhaps grain-boundary sliding as well.https://www.cambridge.org/core/product/identifier/S0260305524000193/type/journal_articleIce crystal studiesIce coreIce coringRecrystallization |
| spellingShingle | Joan J. Fitzpatrick Larry A. Wilen Donald E. Voigt Richard B. Alley John M. Fegyveresi Characteristics, origin and significance of chessboard subgrain boundaries in the WAIS divide ice core Annals of Glaciology Ice crystal studies Ice core Ice coring Recrystallization |
| title | Characteristics, origin and significance of chessboard subgrain boundaries in the WAIS divide ice core |
| title_full | Characteristics, origin and significance of chessboard subgrain boundaries in the WAIS divide ice core |
| title_fullStr | Characteristics, origin and significance of chessboard subgrain boundaries in the WAIS divide ice core |
| title_full_unstemmed | Characteristics, origin and significance of chessboard subgrain boundaries in the WAIS divide ice core |
| title_short | Characteristics, origin and significance of chessboard subgrain boundaries in the WAIS divide ice core |
| title_sort | characteristics origin and significance of chessboard subgrain boundaries in the wais divide ice core |
| topic | Ice crystal studies Ice core Ice coring Recrystallization |
| url | https://www.cambridge.org/core/product/identifier/S0260305524000193/type/journal_article |
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