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https://hdl.handle.net/2440/137325
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dc.contributor.author | Glorie, S. | - |
dc.contributor.author | Hand, M. | - |
dc.contributor.author | Mulder, J. | - |
dc.contributor.author | Simpson, A. | - |
dc.contributor.author | Emo, R. | - |
dc.contributor.author | Kamber, B. | - |
dc.contributor.author | Fernie, N. | - |
dc.contributor.author | Nixon, A. | - |
dc.contributor.author | Gilbert, S. | - |
dc.date.issued | 2024 | - |
dc.identifier.citation | Geological Society Special Publication, 2024; 537(1):165-184 | - |
dc.identifier.issn | 0305-8719 | - |
dc.identifier.issn | 2041-4927 | - |
dc.identifier.uri | https://hdl.handle.net/2440/137325 | - |
dc.description.abstract | Recent development in laser-ablation Lu-Hf dating has opened a new opportunity to rapidly obtain apatite ages that are potentially more robust to isotopic resetting compared to traditional U-Pb dating. However, the robustness of the apatite Lu-Hf system has not been systematically examined. To address this knowledge gap, we conducted four case studies to determine the resistivity of the apatite Lu-Hf system compared to the zircon and apatite U-Pb system. In all cases, the apatite U-Pb system records a secondary (metamorphic or metasomatic) overprint. The apatite Lu-Hf system, however, preserves primary crystallisation ages in unfoliated granitoids at temperatures of at least ∼660 °C. Above ∼730 °C, the Lu-Hf system records isotopic resetting by volume diffusion. Hence, in our observations for apatite of ‘typical’ volumes in granitoids (∼0.01-0.03 mm2), the closure temperature of the Lu-Hf system is between ∼660 and ∼730 °C, consistent with theoretical calculations. In foliated granites, the Lu-Hf system records the timing of recrystallisation, while the apatite U-Pb system tends to record younger cooling ages. We also present apatite Lu-Hf dates for lower crustal xenoliths erupted with young alkali basalts, demonstrating that the Lu-Hf system can retain a memory of primary ages when exposed to magmatic temperatures for a relatively short duration. Hence, the apatite Lu-Hf system is a new insightful addition to traditional zircon (or monazite) U-Pb dating, particularly when zircons/monazites are absent or difficult to interpret due to inheritance or when U and Pb isotopes display open system behaviour. The laser-ablation based Lu-Hf method allows campaign-style studies to be conducted at a similar rate to U-Pb studies, opening new opportunities for magmatic and metamorphic studies. | - |
dc.description.statementofresponsibility | Stijn Glorie, Martin Hand, Jacob Mulder, Alexander Simpson, Robert B. Emo, Balz Kamber, Nicholas Fernie, Angus Nixon, and Sarah Gilbert | - |
dc.language.iso | en | - |
dc.publisher | Geological Society | - |
dc.rights | © 2023 The Geological Society of London | - |
dc.source.uri | http://dx.doi.org/10.1144/sp537-2022-205 | - |
dc.title | Robust laser ablation Lu-Hf dating of apatite: an empirical evaluation | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1144/SP537-2022-205 | - |
dc.relation.grant | http://purl.org/au-research/grants/arc/DP200101881 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Glorie, S. [0000-0002-3107-9028] | - |
dc.identifier.orcid | Hand, M. [0000-0003-3743-9706] | - |
dc.identifier.orcid | Simpson, A. [0000-0001-6029-0116] | - |
dc.identifier.orcid | Nixon, A. [0000-0003-3638-1864] | - |
dc.identifier.orcid | Gilbert, S. [0000-0003-3259-7983] | - |
Appears in Collections: | Geology & Geophysics publications |
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