Zircon U-Pb strain chronometry reveals deep impact-triggered flow
Large (>100km) meteorite impact cratering events play important roles in surface and biosphere evolution, however, their potential for widespread ductile modification of the lithosphere has been difficult to assess, due partly to our inability to isotopically age-correlate deep mineral fabrics wi...
| Main Authors: | , , , , |
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| Format: | Journal Article |
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Elsevier
2009
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| Online Access: | http://hdl.handle.net/20.500.11937/5030 |
| _version_ | 1848744681403318272 |
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| author | Moser, D. Davis, W. Reddy, Steven Flemming, R. Hart, R. |
| author_facet | Moser, D. Davis, W. Reddy, Steven Flemming, R. Hart, R. |
| author_sort | Moser, D. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Large (>100km) meteorite impact cratering events play important roles in surface and biosphere evolution, however, their potential for widespread ductile modification of the lithosphere has been difficult to assess, due partly to our inability to isotopically age-correlate deep mineral fabrics with surface records. We have integrated benchmark U-Pb zircon dating methods (ID-TIMS, SHRIMP) with new microstructural techniques (EBSD, XRD) to demonstrate that crystal-plastic deformation can cause rapid out-diffusion of radiogenic Pb and accompanying trace element alteration in crystalline zircon. We have used this phenomenon to directly date fabric in Archean zircons and xenoliths of the lower crust of South Africa at 2023 15 million years, coeval with the 2020 3 million year old Vredefort cratering event at surface, with extent > or =20,000 km2. Our findings indicate that regional exogenic fabrics, similar to high-temperature tectonic fabrics, exist in ancient crust. Moreover, our results establish that crystal-plastic deformation in the lithosphere can now be directly dated and linked to planetary evolution by zircon U-Pb strain chronometry. |
| first_indexed | 2025-11-14T06:05:20Z |
| format | Journal Article |
| id | curtin-20.500.11937-5030 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:05:20Z |
| publishDate | 2009 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-50302017-09-13T16:04:15Z Zircon U-Pb strain chronometry reveals deep impact-triggered flow Moser, D. Davis, W. Reddy, Steven Flemming, R. Hart, R. geochronology U-Pb dating EBSD zircon tectonics planetary deformation impact Large (>100km) meteorite impact cratering events play important roles in surface and biosphere evolution, however, their potential for widespread ductile modification of the lithosphere has been difficult to assess, due partly to our inability to isotopically age-correlate deep mineral fabrics with surface records. We have integrated benchmark U-Pb zircon dating methods (ID-TIMS, SHRIMP) with new microstructural techniques (EBSD, XRD) to demonstrate that crystal-plastic deformation can cause rapid out-diffusion of radiogenic Pb and accompanying trace element alteration in crystalline zircon. We have used this phenomenon to directly date fabric in Archean zircons and xenoliths of the lower crust of South Africa at 2023 15 million years, coeval with the 2020 3 million year old Vredefort cratering event at surface, with extent > or =20,000 km2. Our findings indicate that regional exogenic fabrics, similar to high-temperature tectonic fabrics, exist in ancient crust. Moreover, our results establish that crystal-plastic deformation in the lithosphere can now be directly dated and linked to planetary evolution by zircon U-Pb strain chronometry. 2009 Journal Article http://hdl.handle.net/20.500.11937/5030 10.1016/j.epsl.2008.09.036 Elsevier fulltext |
| spellingShingle | geochronology U-Pb dating EBSD zircon tectonics planetary deformation impact Moser, D. Davis, W. Reddy, Steven Flemming, R. Hart, R. Zircon U-Pb strain chronometry reveals deep impact-triggered flow |
| title | Zircon U-Pb strain chronometry reveals deep impact-triggered flow |
| title_full | Zircon U-Pb strain chronometry reveals deep impact-triggered flow |
| title_fullStr | Zircon U-Pb strain chronometry reveals deep impact-triggered flow |
| title_full_unstemmed | Zircon U-Pb strain chronometry reveals deep impact-triggered flow |
| title_short | Zircon U-Pb strain chronometry reveals deep impact-triggered flow |
| title_sort | zircon u-pb strain chronometry reveals deep impact-triggered flow |
| topic | geochronology U-Pb dating EBSD zircon tectonics planetary deformation impact |
| url | http://hdl.handle.net/20.500.11937/5030 |