Dating of marine authigenic minerals via in situ Rb–Sr, U–Pb, and Lu–Hf: A case study from the Georgina Basin, Australia
Date
2025
Authors
Shao, Z.
Farkaš, J.
Glorie, S.
Collins, A.S.
Gilbert, S.E.
Subarkah, D.
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Advisors
Journal Title
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Volume Title
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Journal article
Citation
Chemical Geology, 2025; 695:123042-1-123042-18
Statement of Responsibility
Zhufu Shao, Juraj Farkaš , Stijn Glorie, Alan S. Collins, Sarah E. Gilbert, Darwinaji Subarkah
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Abstract
The in situ laser ablation–inductively coupled plasma tandem mass spectrometry (LA-ICP-MS/MS) technique enables rapid, high-resolution isotopic analysis with minimal contamination, ideal for dating authigenic minerals. This study employs LA-ICP-MS/MS triple dating (Rb–Sr, U–Pb, Lu–Hf) on key authigenic minerals from the mid-Cambrian (~505 ± 3 Ma) marine sequence of Australia’s Georgina Basin. Glauconite, micrite, dolomite, and apatite were analyzed to constrain depositional ages and diagenetic overprints. Glauconite exhibits high porosity, extensive illitization, and secondary minerals, reflecting post-depositional alteration. In situ Rb–Sr dating of glauconite yielded systematically younger ages (452 ± 13 Ma to 351 ± 8 Ma) coeval with two episodes of the Alice Springs Orogeny. Well-preserved micrite and fine dolomite yielded U–Pb ages of 500 ± 17 Ma and 513 ± 19 Ma, consistent with the depositional age, whereas a coarser dolomite yielded a younger age of 478 ± 23 Ma with lower initial Pb. In situ Lu–Hf dating of apatite from three dolostone samples yielded ages of 497 ± 69 Ma, 495 ± 79 Ma, and 493 ± 74 Ma, overlapping with the depositional window despite notable uncertainties. A phosphorite sample yielded a Lu–Hf age of 425 ± 49 Ma, coeval with the Rodingan event. In situ U–Pb apatite ages yielded dispersed and unrealistic ages demonstrating that the Lu–Hf system provides more robust ages than U–Pb for authigenic apatite, whereas Rb–Sr ages reflect diagenetic resetting during orogeny. The integration of three radiometric systems provides a refined framework for reconstructing the basin’s depositional and diagenetic history.
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Dissertation Note
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Corrected by: Erratum to < Erratum to <“Dating of marine authigenic minerals via in situ Rb–Sr, U–Pb, and Lu–Hf: A case study from the Georgina Basin, Australia>< Chemical Geology 695 (2025) 123042>. Chemical Geology Volume 695, 5 November 2025, 123063. It was discovered that previously published version of Table 1 and Table 2 was lost during the production process that were not the fault of the author(s). The Publisher decided to ‘resupply’ (repost and replace) the XML and online PDF of the article. Elsevier regrets and apologizes for any inconvenience caused by posting a new version of this article online, but hopes that the reader will understand the reasons for doing so. DOI.
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© 2025 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).