Complex magmatic and impact history prior to 4.1 Ga recorded in zircon from Apollo 17 South Massif aphanitic breccia 73235
Sample 73235 is one of several aphanitic impact melt breccias collected by the Apollo 17 mission at stations 2 and 3 on the slopes of the South Massif. This study presents a detailed investigation of internal structures and U-Pb ages of large zircon grains from this breccia sample. New data combined...
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| Format: | Journal Article |
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Pergamon-Elsevier Science Ltd
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/2774 |
| _version_ | 1848744044472041472 |
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| author | Grange, Marion Nemchin, Alexander Timms, Nicholas Eric Pidgeon, Robert Meyer, C. |
| author_facet | Grange, Marion Nemchin, Alexander Timms, Nicholas Eric Pidgeon, Robert Meyer, C. |
| author_sort | Grange, Marion |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Sample 73235 is one of several aphanitic impact melt breccias collected by the Apollo 17 mission at stations 2 and 3 on the slopes of the South Massif. This study presents a detailed investigation of internal structures and U-Pb ages of large zircon grains from this breccia sample. New data combined with the results of previous studies of zircon grains from the same location indicate that most zircon clasts in breccias from stations 2 and 3 formed during multiple magmatic events between 4.37 and 4.31 Ga, although the oldest zircon crystallized at about 4.42 Ga and the youngest at 4.21 Ga. In addition, zircons from the aphanitic breccias record several impact events prior to the 3.9 Ga Late Heavy Bombardment.The results indicate that the zircons probably crystallized at different locations within the Procellarum KREEEP Terrane and were later excavated and modified by several impacts and delivered to the same locality within separate ejecta blankets. This locality became a source of material that formed the aphanitic impact melt breccias of the South Massif during a 3.9 Ga impact. However, the zircons, showing old impact features, are not modified by this 3.9 Ga impact event suggesting that (i) this common source area was located at the periphery of excavation cavity, and (ii) the > 3.9 Ga ages recorded by the zircon grains could date large (basin-forming) events as significant as major later (3.9 Ga) collisions such as Imbrium and Serenitatis. |
| first_indexed | 2025-11-14T05:55:12Z |
| format | Journal Article |
| id | curtin-20.500.11937-2774 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T05:55:12Z |
| publishDate | 2011 |
| publisher | Pergamon-Elsevier Science Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-27742019-02-19T04:27:00Z Complex magmatic and impact history prior to 4.1 Ga recorded in zircon from Apollo 17 South Massif aphanitic breccia 73235 Grange, Marion Nemchin, Alexander Timms, Nicholas Eric Pidgeon, Robert Meyer, C. zircon internal texture Lunar zircon U-Pb dating impact and igneous events EBSD deformation Sample 73235 is one of several aphanitic impact melt breccias collected by the Apollo 17 mission at stations 2 and 3 on the slopes of the South Massif. This study presents a detailed investigation of internal structures and U-Pb ages of large zircon grains from this breccia sample. New data combined with the results of previous studies of zircon grains from the same location indicate that most zircon clasts in breccias from stations 2 and 3 formed during multiple magmatic events between 4.37 and 4.31 Ga, although the oldest zircon crystallized at about 4.42 Ga and the youngest at 4.21 Ga. In addition, zircons from the aphanitic breccias record several impact events prior to the 3.9 Ga Late Heavy Bombardment.The results indicate that the zircons probably crystallized at different locations within the Procellarum KREEEP Terrane and were later excavated and modified by several impacts and delivered to the same locality within separate ejecta blankets. This locality became a source of material that formed the aphanitic impact melt breccias of the South Massif during a 3.9 Ga impact. However, the zircons, showing old impact features, are not modified by this 3.9 Ga impact event suggesting that (i) this common source area was located at the periphery of excavation cavity, and (ii) the > 3.9 Ga ages recorded by the zircon grains could date large (basin-forming) events as significant as major later (3.9 Ga) collisions such as Imbrium and Serenitatis. 2011 Journal Article http://hdl.handle.net/20.500.11937/2774 10.1016/j.gca.2011.01.036 Pergamon-Elsevier Science Ltd fulltext |
| spellingShingle | zircon internal texture Lunar zircon U-Pb dating impact and igneous events EBSD deformation Grange, Marion Nemchin, Alexander Timms, Nicholas Eric Pidgeon, Robert Meyer, C. Complex magmatic and impact history prior to 4.1 Ga recorded in zircon from Apollo 17 South Massif aphanitic breccia 73235 |
| title | Complex magmatic and impact history prior to 4.1 Ga recorded in zircon from Apollo 17 South Massif aphanitic breccia 73235 |
| title_full | Complex magmatic and impact history prior to 4.1 Ga recorded in zircon from Apollo 17 South Massif aphanitic breccia 73235 |
| title_fullStr | Complex magmatic and impact history prior to 4.1 Ga recorded in zircon from Apollo 17 South Massif aphanitic breccia 73235 |
| title_full_unstemmed | Complex magmatic and impact history prior to 4.1 Ga recorded in zircon from Apollo 17 South Massif aphanitic breccia 73235 |
| title_short | Complex magmatic and impact history prior to 4.1 Ga recorded in zircon from Apollo 17 South Massif aphanitic breccia 73235 |
| title_sort | complex magmatic and impact history prior to 4.1 ga recorded in zircon from apollo 17 south massif aphanitic breccia 73235 |
| topic | zircon internal texture Lunar zircon U-Pb dating impact and igneous events EBSD deformation |
| url | http://hdl.handle.net/20.500.11937/2774 |