Disorientation control on trace element segregation in fluid-affected low-angle boundaries in olivine
The geometry and composition of deformation-related low-angle boundaries in naturally deformed olivine were characterized by electron backscattered diffraction (EBSD) and atom probe tomography (APT). EBSD data show the presence of discrete low-angle tilt boundaries, which formed by subgrain rotation...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Language: | English |
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SPRINGER
2021
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| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/LP130100053 http://hdl.handle.net/20.500.11937/89402 |
| _version_ | 1848765210814316544 |
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| author | Tacchetto, Tom Reddy, Steven Saxey, David Fougerouse, Denis Rickard, William Clark, Chris |
| author_facet | Tacchetto, Tom Reddy, Steven Saxey, David Fougerouse, Denis Rickard, William Clark, Chris |
| author_sort | Tacchetto, Tom |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The geometry and composition of deformation-related low-angle boundaries in naturally deformed olivine were characterized by electron backscattered diffraction (EBSD) and atom probe tomography (APT). EBSD data show the presence of discrete low-angle tilt boundaries, which formed by subgrain rotation recrystallisation associated with the (100)[001] slip system during fluid-catalysed metamorphism and deformation. APT analyses of these interfaces show the preferential segregation of olivine-derived trace elements (Ca, Al, Ti, P, Mn, Fe, Na and Co) to the low-angle boundaries. Boundaries with < 2° show marked enrichment associated with the presence of multiple, non-parallel dislocation types. However, at larger disorientation angles (> 2°), the interfaces become more ordered and linear enrichment of trace elements coincides with the orientation of dislocations inferred from the EBSD data. These boundaries show a systematic increase of trace element concentration with disorientation angle. Olivine-derived trace elements segregated to the low-angle boundaries are interpreted to be captured and travel with dislocations as they migrate to the subgrain boundary interfaces. However, the presence of exotic trace elements Cl and H, also enriched in the low-angle boundaries, likely reflect the contribution of an external fluid source during the fluid-present deformation. The observed compositional segregation of trace elements has significant implications for the deformation and transformation of olivine at mantle depth, the interpretation of geophysical data and the redistribution of elements deep in the Earth. The observation that similar features are widely recognised in manufactured materials, indicates that the segregation of trace elements to mineral interfaces is likely to be widespread. |
| first_indexed | 2025-11-14T11:31:38Z |
| format | Journal Article |
| id | curtin-20.500.11937-89402 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:31:38Z |
| publishDate | 2021 |
| publisher | SPRINGER |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-894022023-06-07T02:31:26Z Disorientation control on trace element segregation in fluid-affected low-angle boundaries in olivine Tacchetto, Tom Reddy, Steven Saxey, David Fougerouse, Denis Rickard, William Clark, Chris Science & Technology Physical Sciences Geochemistry & Geophysics Mineralogy Olivine Deformation microstructures Grain boundaries Mineral interfaces Atom probe tomography EBSD GRAIN-BOUNDARIES PLASTIC-DEFORMATION BERGEN ARCS ATOM-PROBE ELECTRICAL-CONDUCTIVITY INCOMPATIBLE ELEMENTS DISLOCATION CREEP WATER ECLOGITE DIFFUSION The geometry and composition of deformation-related low-angle boundaries in naturally deformed olivine were characterized by electron backscattered diffraction (EBSD) and atom probe tomography (APT). EBSD data show the presence of discrete low-angle tilt boundaries, which formed by subgrain rotation recrystallisation associated with the (100)[001] slip system during fluid-catalysed metamorphism and deformation. APT analyses of these interfaces show the preferential segregation of olivine-derived trace elements (Ca, Al, Ti, P, Mn, Fe, Na and Co) to the low-angle boundaries. Boundaries with < 2° show marked enrichment associated with the presence of multiple, non-parallel dislocation types. However, at larger disorientation angles (> 2°), the interfaces become more ordered and linear enrichment of trace elements coincides with the orientation of dislocations inferred from the EBSD data. These boundaries show a systematic increase of trace element concentration with disorientation angle. Olivine-derived trace elements segregated to the low-angle boundaries are interpreted to be captured and travel with dislocations as they migrate to the subgrain boundary interfaces. However, the presence of exotic trace elements Cl and H, also enriched in the low-angle boundaries, likely reflect the contribution of an external fluid source during the fluid-present deformation. The observed compositional segregation of trace elements has significant implications for the deformation and transformation of olivine at mantle depth, the interpretation of geophysical data and the redistribution of elements deep in the Earth. The observation that similar features are widely recognised in manufactured materials, indicates that the segregation of trace elements to mineral interfaces is likely to be widespread. 2021 Journal Article http://hdl.handle.net/20.500.11937/89402 10.1007/s00410-021-01815-3 English http://purl.org/au-research/grants/arc/LP130100053 http://purl.org/au-research/grants/arc/DP160104637 http://purl.org/au-research/grants/arc/DP210102625 SPRINGER fulltext |
| spellingShingle | Science & Technology Physical Sciences Geochemistry & Geophysics Mineralogy Olivine Deformation microstructures Grain boundaries Mineral interfaces Atom probe tomography EBSD GRAIN-BOUNDARIES PLASTIC-DEFORMATION BERGEN ARCS ATOM-PROBE ELECTRICAL-CONDUCTIVITY INCOMPATIBLE ELEMENTS DISLOCATION CREEP WATER ECLOGITE DIFFUSION Tacchetto, Tom Reddy, Steven Saxey, David Fougerouse, Denis Rickard, William Clark, Chris Disorientation control on trace element segregation in fluid-affected low-angle boundaries in olivine |
| title | Disorientation control on trace element segregation in fluid-affected low-angle boundaries in olivine |
| title_full | Disorientation control on trace element segregation in fluid-affected low-angle boundaries in olivine |
| title_fullStr | Disorientation control on trace element segregation in fluid-affected low-angle boundaries in olivine |
| title_full_unstemmed | Disorientation control on trace element segregation in fluid-affected low-angle boundaries in olivine |
| title_short | Disorientation control on trace element segregation in fluid-affected low-angle boundaries in olivine |
| title_sort | disorientation control on trace element segregation in fluid-affected low-angle boundaries in olivine |
| topic | Science & Technology Physical Sciences Geochemistry & Geophysics Mineralogy Olivine Deformation microstructures Grain boundaries Mineral interfaces Atom probe tomography EBSD GRAIN-BOUNDARIES PLASTIC-DEFORMATION BERGEN ARCS ATOM-PROBE ELECTRICAL-CONDUCTIVITY INCOMPATIBLE ELEMENTS DISLOCATION CREEP WATER ECLOGITE DIFFUSION |
| url | http://purl.org/au-research/grants/arc/LP130100053 http://purl.org/au-research/grants/arc/LP130100053 http://purl.org/au-research/grants/arc/LP130100053 http://hdl.handle.net/20.500.11937/89402 |