Eocene (46–44 Ma) Onset of Australia‐Pacific Plate Motion in the Southwest Pacific Inferred From Stratigraphy in New Caledonia and New Zealand

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dc.citation.articleNumbere2019GC008699
dc.citation.issueNumber7
dc.citation.journalTitleGeochemistry, Geophysics, Geosystems
dc.citation.volumeNumber21
dc.contributor.authorDallanave, Edoardo
dc.contributor.authorMaurizot, Pierre
dc.contributor.authorAgnini, Claudia
dc.contributor.authorSutherland, Rupert
dc.contributor.authorHollis, Christopher J.
dc.contributor.authorCollot, Julien
dc.contributor.authorDickens, Gerald R.
dc.contributor.authorBachtadse, Valerian
dc.contributor.authorStrogen, Dominic
dc.contributor.authorMorgans, Hugh E.G.
dc.date.accessioned2020-11-17T15:11:45Z
dc.date.available2020-11-17T15:11:45Z
dc.date.issued2020
dc.description.abstractThe Pacific plate circuit went through a complex reorganization during the early to middle Eocene, approximately coinciding with the onset of subduction along the western Pacific margin. However, the timing and dynamics of this change in the southwest Pacific and evolution of subduction beneath the Tonga‐Kermadec Arc are not fully resolved. We present magneto‐biostratigraphic data from an early to middle Eocene sedimentary section exposed in the Koumac‐Gomen area, New Caledonia, which is an emerged portion of the Norfolk Ridge. The 260 m‐thick succession contains a transition from pelagic micrite to terrigenous‐rich calciturbidite that is observed regionally in New Caledonia and which is interpreted to represent a shift from sedimentation on a stable submarine plateau to slope formation developed under a convergent tectonic regime. The stratigraphic contact between pelagic micrite and overlying calciturbidite is not exposed, but our magnetic polarity‐based chronology constrains the age of transition to 46–44 Ma, in agreement with the 45.3 Ma age recently obtained from the Noumea area in southern New Caledonia. We integrate records from New Caledonia with recent magnetostratigraphic data from South Island, New Zealand, where marked variations in terrigenous input occurred during the early and middle Eocene. Synchronous sedimentary changes in the southwest Pacific occurred at the same time as onset of rapid seafloor spreading south of Australia and New Zealand. We infer that the underlying cause of stratigraphic change was inception of slip at a new configuration of the Australia‐Pacific plate boundary, which evolved into the Tonga‐Kermadec subduction system.
dc.identifier.citationDallanave, Edoardo, Maurizot, Pierre, Agnini, Claudia, et al.. "Eocene (46–44 Ma) Onset of Australia‐Pacific Plate Motion in the Southwest Pacific Inferred From Stratigraphy in New Caledonia and New Zealand." <i>Geochemistry, Geophysics, Geosystems,</i> 21, no. 7 (2020) Wiley: https://doi.org/10.1029/2019GC008699.
dc.identifier.doihttps://doi.org/10.1029/2019GC008699
dc.identifier.urihttps://hdl.handle.net/1911/109559
dc.language.isoeng
dc.publisherWiley
dc.rightsThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleEocene (46–44 Ma) Onset of Australia‐Pacific Plate Motion in the Southwest Pacific Inferred From Stratigraphy in New Caledonia and New Zealand
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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