The Juvenile Hafnium Isotope Signal as a Record of Supercontinent Cycles
Hf isotope ratios measured in igneous zircon are controlled by magmatic source, which may be linked to tectonic setting. Over the 200-500 Myr periodicity of the supercontinent cycle - the principal geological phenomenon controlling prevailing global tectonic style - juvenile Hf signals, i.e. most ra...
| Main Authors: | , , |
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| Format: | Journal Article |
| Published: |
Nature Publishing Group
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/25080 |
| _version_ | 1848751608444223488 |
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| author | Gardiner, N. Kirkland, Chris Van Kranendonk, M. |
| author_facet | Gardiner, N. Kirkland, Chris Van Kranendonk, M. |
| author_sort | Gardiner, N. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Hf isotope ratios measured in igneous zircon are controlled by magmatic source, which may be linked to tectonic setting. Over the 200-500 Myr periodicity of the supercontinent cycle - the principal geological phenomenon controlling prevailing global tectonic style - juvenile Hf signals, i.e. most radiogenic, are typically measured in zircon from granites formed in arc settings (crustal growth), and evolved zircon Hf signals in granites formed in continent-collision settings (crustal reworking). Interrogations of Hf datasets for excursions related to Earth events commonly use the median value, however this may be equivocal due to magma mixing. The most juvenile part of the Hf signal is less influenced by crustal in-mixing, and arguably a more sensitive archive of Earth's geodynamic state. We analyze the global Hf dataset for this juvenile signal, statistically correlating supercontinent amalgamation intervals with evolved Hf episodes, and breakup leading to re-assembly with juvenile Hf episodes. The juvenile Hf signal is more sensitive to Pangaea and Rodinia assembly, its amplitude increasing with successive cycles to a maximum with Gondwana assembly which may reflect enhanced subduction-erosion. We demonstrate that the juvenile Hf signal carries important information on prevailing global magmatic style, and thus tectonic processes. |
| first_indexed | 2025-11-14T07:55:26Z |
| format | Journal Article |
| id | curtin-20.500.11937-25080 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:55:26Z |
| publishDate | 2016 |
| publisher | Nature Publishing Group |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-250802020-12-03T03:52:46Z The Juvenile Hafnium Isotope Signal as a Record of Supercontinent Cycles Gardiner, N. Kirkland, Chris Van Kranendonk, M. Hf isotope ratios measured in igneous zircon are controlled by magmatic source, which may be linked to tectonic setting. Over the 200-500 Myr periodicity of the supercontinent cycle - the principal geological phenomenon controlling prevailing global tectonic style - juvenile Hf signals, i.e. most radiogenic, are typically measured in zircon from granites formed in arc settings (crustal growth), and evolved zircon Hf signals in granites formed in continent-collision settings (crustal reworking). Interrogations of Hf datasets for excursions related to Earth events commonly use the median value, however this may be equivocal due to magma mixing. The most juvenile part of the Hf signal is less influenced by crustal in-mixing, and arguably a more sensitive archive of Earth's geodynamic state. We analyze the global Hf dataset for this juvenile signal, statistically correlating supercontinent amalgamation intervals with evolved Hf episodes, and breakup leading to re-assembly with juvenile Hf episodes. The juvenile Hf signal is more sensitive to Pangaea and Rodinia assembly, its amplitude increasing with successive cycles to a maximum with Gondwana assembly which may reflect enhanced subduction-erosion. We demonstrate that the juvenile Hf signal carries important information on prevailing global magmatic style, and thus tectonic processes. 2016 Journal Article http://hdl.handle.net/20.500.11937/25080 10.1038/srep38503 http://creativecommons.org/licenses/by/4.0/ Nature Publishing Group fulltext |
| spellingShingle | Gardiner, N. Kirkland, Chris Van Kranendonk, M. The Juvenile Hafnium Isotope Signal as a Record of Supercontinent Cycles |
| title | The Juvenile Hafnium Isotope Signal as a Record of Supercontinent Cycles |
| title_full | The Juvenile Hafnium Isotope Signal as a Record of Supercontinent Cycles |
| title_fullStr | The Juvenile Hafnium Isotope Signal as a Record of Supercontinent Cycles |
| title_full_unstemmed | The Juvenile Hafnium Isotope Signal as a Record of Supercontinent Cycles |
| title_short | The Juvenile Hafnium Isotope Signal as a Record of Supercontinent Cycles |
| title_sort | juvenile hafnium isotope signal as a record of supercontinent cycles |
| url | http://hdl.handle.net/20.500.11937/25080 |