A hidden Rodinian lithospheric keel beneath Zealandia, Earth's newly recognized continent
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 cha...
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| Main Authors: | , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
12 May 2021
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| In: |
Geology
Year: 2021, Volume: 49, Issue: 8, Pages: 1009-1014 |
| ISSN: | 1943-2682 |
| DOI: | 10.1130/G48711.1 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1130/G48711.1
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| Author Notes: | R.E. Turnbull, J.J. Schwartz, M.L. Fiorentini, R. Jongens, N.J. Evans, T. Ludwig, B.J. McDonald and K.A. Klepeis |
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| 245 | 1 | 2 | |a A hidden Rodinian lithospheric keel beneath Zealandia, Earth's newly recognized continent |c R.E. Turnbull, J.J. Schwartz, M.L. Fiorentini, R. Jongens, N.J. Evans, T. Ludwig, B.J. McDonald and K.A. Klepeis |
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| 520 | |a 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. | ||
| 700 | 1 | |a Schwartz, J.J. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Fiorentini, M.L. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Jongens, R. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Evans, N.J. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Ludwig, Thomas |e VerfasserIn |0 (DE-588)1069798339 |0 (DE-627)822403471 |0 (DE-576)429492197 |4 aut | |
| 700 | 1 | |a McDonald, B.J. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Klepeis, K.A. |e VerfasserIn |4 aut | |
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