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dc.contributor.authorGardiner, N.
dc.contributor.authorKirkland, Chris
dc.contributor.authorVan Kranendonk, M.
dc.date.accessioned2017-01-30T12:46:39Z
dc.date.available2017-01-30T12:46:39Z
dc.date.created2016-12-21T19:30:20Z
dc.date.issued2016
dc.identifier.citationGardiner, N. and Kirkland, C. and Van Kranendonk, M. 2016. The Juvenile Hafnium Isotope Signal as a Record of Supercontinent Cycles. Scientific Reports. 6 (Article No. 38503): pp. 1-10.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/25080
dc.identifier.doi10.1038/srep38503
dc.description.abstract

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.

dc.publisherNature Publishing Group
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleThe Juvenile Hafnium Isotope Signal as a Record of Supercontinent Cycles
dc.typeJournal Article
dcterms.source.volume6
dcterms.source.titleScientific Reports
curtin.departmentDepartment of Applied Geology
curtin.accessStatusOpen access


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