File:G48711.1.pdf
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[edit]DescriptionG48711.1.pdf |
English: We present a data set of >1500 in situ O-Hf-U-Pb zircon isotope analyses that document the existence of a concealed Rodinian lithospheric keel beneath continental Zealandia. The new data reveal the presence of a distinct isotopic domain of Paleozoic–Mesozoic plutonic rocks that contain zircon characterized by anomalously low δ18O values (median = +4.1‰) and radiogenic εHf(t) (median = +6.1). The scale (>10,000 km2) and time span (>>250 m.y.) over which plutonic rocks with this anomalously low-δ18O signature were emplaced appear unique in a global context, especially for magmas generated and emplaced along a continental margin. Calculated crustal-residence ages (depleted mantle model, TDM) for this low-δ18O isotope domain range from 1300 to 500 Ma and are interpreted to represent melting of a Precambrian lithospheric keel that was formed and subsequently hydrothermally altered during Rodinian assembly and rifting. Recognition of a concealed Precambrian lithosphere beneath Zealandia and the uniqueness of the pervasive low-δ18O isotope domain link Zealandia to South China, providing a novel test of specific hypotheses of continental block arrangements within Rodinia. |
Date | |
Source | https://doi.org/10.1130/G48711.1 |
Author | R.E. Turnbull, J.J. Schwartz, M.L. Fiorentini, R. Jongens, N.J. Evans, T. Ludwig, B.J. McDonald, K.A. Klepeis |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:30, 20 August 2021 | 1,237 × 1,631, 6 pages (1.31 MB) | Pamputt (talk | contribs) | Uploaded a work by R.E. Turnbull, J.J. Schwartz, M.L. Fiorentini, R. Jongens, N.J. Evans, T. Ludwig, B.J. McDonald, K.A. Klepeis from https://pubs.geoscienceworld.org/gsa/geology/article/49/8/1009/598229/A-hidden-Rodinian-lithospheric-keel-beneath https://doi.org/10.1130/G48711.1 with UploadWizard |
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Unique ID of original document | xmp.did:0180117407206811B34BD73E108BEDC2 |
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Date and time of digitizing | 02:30, 7 July 2021 |
File change date and time | 18:26, 20 August 2021 |
Date metadata was last modified | 18:26, 20 August 2021 |
Software used | Adobe InDesign CC (Windows) |
Conversion program | Adobe PDF Library 10.0.1; modified using iTextSharp 4.1.6 by 1T3XT |
Encrypted | no |
Page size | 594 x 783 pts |
Version of PDF format | 1.4 |
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