Garnet Reference Materials for In Situ Lu-Hf Geochronology
In situ garnet Lu-Hf geochronology has the potential to revolutionise the chronology of petrological and tectonic processes, yet there is a paucity of well-characterised reference materials to account for laser-induced matrix-dependant elemental fractionation. Here, we characterise two reference gar...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Journal Article |
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2024
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| Online Access: | http://purl.org/au-research/grants/arc/LE190100176 http://hdl.handle.net/20.500.11937/96276 |
| _version_ | 1848766125081362432 |
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| author | Ribeiro, Bruno Kirkland, Chris Smit, M. Musiyachenko, K. Korhonen, F.J. Evans, Noreen Rankenburg, Kai McDonald, Bradley Glorie, S. Gilbert, S.E. Goemann, K. Belousov, I. Oalmann, J. Clark, Chris Makin, Sean |
| author_facet | Ribeiro, Bruno Kirkland, Chris Smit, M. Musiyachenko, K. Korhonen, F.J. Evans, Noreen Rankenburg, Kai McDonald, Bradley Glorie, S. Gilbert, S.E. Goemann, K. Belousov, I. Oalmann, J. Clark, Chris Makin, Sean |
| author_sort | Ribeiro, Bruno |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | In situ garnet Lu-Hf geochronology has the potential to revolutionise the chronology of petrological and tectonic processes, yet there is a paucity of well-characterised reference materials to account for laser-induced matrix-dependant elemental fractionation. Here, we characterise two reference garnets GWA-1 (Lu ~ 7.0 μg g−1) and GWA-2 (Lu ~ 8.5 μg g−1) for in situ garnet Lu-Hf geochronology. Isochron ages from isotope dilution Lu-Hf analyses yield crystallisation ages of 1267.0 ± 3.0 Ma with initial 176Hf/177Hfi of 0.281415 ± 0.000012 (GWA-1), and 934.7 ± 1.4 Ma with 176Hf/177Hfi of 0.281386 ± 0.000013 (GWA-2). In situ Lu-Hf analyses yield inverse isochron ages up to 10% older than the known crystallisation age due to matrix effects between garnet and reference glass (NIST SRM 610) under different instrument tuning conditions. This apparent age offset is reproducible for both materials within the same session and can be readily corrected to obtain accurate ages. Our results demonstrate that GWA-1 and GWA-2 are robust reference materials that can be used to correct for matrix-analytical effects and also to assess the accuracy of in situ Lu-Hf garnet analyses across a range of commonly encountered garnet compositions. |
| first_indexed | 2025-11-14T11:46:10Z |
| format | Journal Article |
| id | curtin-20.500.11937-96276 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T11:46:10Z |
| publishDate | 2024 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-962762024-12-17T01:46:19Z Garnet Reference Materials for In Situ Lu-Hf Geochronology Ribeiro, Bruno Kirkland, Chris Smit, M. Musiyachenko, K. Korhonen, F.J. Evans, Noreen Rankenburg, Kai McDonald, Bradley Glorie, S. Gilbert, S.E. Goemann, K. Belousov, I. Oalmann, J. Clark, Chris Makin, Sean In situ garnet Lu-Hf geochronology has the potential to revolutionise the chronology of petrological and tectonic processes, yet there is a paucity of well-characterised reference materials to account for laser-induced matrix-dependant elemental fractionation. Here, we characterise two reference garnets GWA-1 (Lu ~ 7.0 μg g−1) and GWA-2 (Lu ~ 8.5 μg g−1) for in situ garnet Lu-Hf geochronology. Isochron ages from isotope dilution Lu-Hf analyses yield crystallisation ages of 1267.0 ± 3.0 Ma with initial 176Hf/177Hfi of 0.281415 ± 0.000012 (GWA-1), and 934.7 ± 1.4 Ma with 176Hf/177Hfi of 0.281386 ± 0.000013 (GWA-2). In situ Lu-Hf analyses yield inverse isochron ages up to 10% older than the known crystallisation age due to matrix effects between garnet and reference glass (NIST SRM 610) under different instrument tuning conditions. This apparent age offset is reproducible for both materials within the same session and can be readily corrected to obtain accurate ages. Our results demonstrate that GWA-1 and GWA-2 are robust reference materials that can be used to correct for matrix-analytical effects and also to assess the accuracy of in situ Lu-Hf garnet analyses across a range of commonly encountered garnet compositions. 2024 Journal Article http://hdl.handle.net/20.500.11937/96276 10.1111/ggr.12579 http://purl.org/au-research/grants/arc/LE190100176 https://creativecommons.org/licenses/by-nc-nd/4.0/ fulltext |
| spellingShingle | Ribeiro, Bruno Kirkland, Chris Smit, M. Musiyachenko, K. Korhonen, F.J. Evans, Noreen Rankenburg, Kai McDonald, Bradley Glorie, S. Gilbert, S.E. Goemann, K. Belousov, I. Oalmann, J. Clark, Chris Makin, Sean Garnet Reference Materials for In Situ Lu-Hf Geochronology |
| title | Garnet Reference Materials for In Situ Lu-Hf Geochronology |
| title_full | Garnet Reference Materials for In Situ Lu-Hf Geochronology |
| title_fullStr | Garnet Reference Materials for In Situ Lu-Hf Geochronology |
| title_full_unstemmed | Garnet Reference Materials for In Situ Lu-Hf Geochronology |
| title_short | Garnet Reference Materials for In Situ Lu-Hf Geochronology |
| title_sort | garnet reference materials for in situ lu-hf geochronology |
| url | http://purl.org/au-research/grants/arc/LE190100176 http://hdl.handle.net/20.500.11937/96276 |