Pb-Pb ages of feldspathic clasts in two Apollo 14 breccia samples
© 2017 Elsevier Ltd Pb-Pb isochron ages of ca. 3.92 Ga for three K-feldspar-rich clasts from Apollo 14 breccias 14303 and 14083 were determined using Secondary Ion Mass Spectrometry (SIMS). These ages are interpreted to represent the resetting of the U-Pb system in the clasts as a result of brecciat...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Journal Article |
| Published: |
Pergamon
2017
|
| Online Access: | http://hdl.handle.net/20.500.11937/58209 |
| _version_ | 1848760203618549760 |
|---|---|
| author | Nemchin, Alexander Jeon, H. Bellucci, J. Timms, Nicholas Eric Snape, J. Kilburn, M. Whitehouse, M. |
| author_facet | Nemchin, Alexander Jeon, H. Bellucci, J. Timms, Nicholas Eric Snape, J. Kilburn, M. Whitehouse, M. |
| author_sort | Nemchin, Alexander |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2017 Elsevier Ltd Pb-Pb isochron ages of ca. 3.92 Ga for three K-feldspar-rich clasts from Apollo 14 breccias 14303 and 14083 were determined using Secondary Ion Mass Spectrometry (SIMS). These ages are interpreted to represent the resetting of the U-Pb system in the clasts as a result of brecciation during the Imbrium impact. One of the clasts contains zircon grains that record a significantly older crystallization age (ca. 4.33–4.35 Ga) for the rock represented by that clast. Initial Pb compositions determined for the clasts, combined with the previously measured Pb isotopic compositions of K-feldspar grains from several Apollo 14 breccia samples, constrain a range of initial Pb compositions in the ca. 3.9 Ga Fra Mauro formation at the Apollo 14 landing site. This range in initial Pb compositions indicates that the rocks represented by these clasts, or the sources of those rocks, evolved with a high 238 U/ 204 Pb (µ-value) for substantial periods of time, although the precise crystallization ages of the rocks represented by at least two of the clasts investigated here are unknown. |
| first_indexed | 2025-11-14T10:12:03Z |
| format | Journal Article |
| id | curtin-20.500.11937-58209 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:12:03Z |
| publishDate | 2017 |
| publisher | Pergamon |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-582092017-11-24T05:45:55Z Pb-Pb ages of feldspathic clasts in two Apollo 14 breccia samples Nemchin, Alexander Jeon, H. Bellucci, J. Timms, Nicholas Eric Snape, J. Kilburn, M. Whitehouse, M. © 2017 Elsevier Ltd Pb-Pb isochron ages of ca. 3.92 Ga for three K-feldspar-rich clasts from Apollo 14 breccias 14303 and 14083 were determined using Secondary Ion Mass Spectrometry (SIMS). These ages are interpreted to represent the resetting of the U-Pb system in the clasts as a result of brecciation during the Imbrium impact. One of the clasts contains zircon grains that record a significantly older crystallization age (ca. 4.33–4.35 Ga) for the rock represented by that clast. Initial Pb compositions determined for the clasts, combined with the previously measured Pb isotopic compositions of K-feldspar grains from several Apollo 14 breccia samples, constrain a range of initial Pb compositions in the ca. 3.9 Ga Fra Mauro formation at the Apollo 14 landing site. This range in initial Pb compositions indicates that the rocks represented by these clasts, or the sources of those rocks, evolved with a high 238 U/ 204 Pb (µ-value) for substantial periods of time, although the precise crystallization ages of the rocks represented by at least two of the clasts investigated here are unknown. 2017 Journal Article http://hdl.handle.net/20.500.11937/58209 10.1016/j.gca.2017.08.024 Pergamon restricted |
| spellingShingle | Nemchin, Alexander Jeon, H. Bellucci, J. Timms, Nicholas Eric Snape, J. Kilburn, M. Whitehouse, M. Pb-Pb ages of feldspathic clasts in two Apollo 14 breccia samples |
| title | Pb-Pb ages of feldspathic clasts in two Apollo 14 breccia samples |
| title_full | Pb-Pb ages of feldspathic clasts in two Apollo 14 breccia samples |
| title_fullStr | Pb-Pb ages of feldspathic clasts in two Apollo 14 breccia samples |
| title_full_unstemmed | Pb-Pb ages of feldspathic clasts in two Apollo 14 breccia samples |
| title_short | Pb-Pb ages of feldspathic clasts in two Apollo 14 breccia samples |
| title_sort | pb-pb ages of feldspathic clasts in two apollo 14 breccia samples |
| url | http://hdl.handle.net/20.500.11937/58209 |