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

Dallanave, Edoardo, Pierre Maurizot, Claudia Agnini, Rupert Sutherland, Christopher J. Hollis, Julien Collot, Gerald R. Dickens, Valerian Bachtadse, Dominic Strogen, and Hugh E. G. Morgans (2020), Eocene (46–44 Ma) Onset of Australia-Pacific Plate Motion in the Southwest Pacific Inferred From Stratigraphy in New Caledonia and New Zealand, Geochemistry, Geophysics, Geosystems, 21(7), e2019GC008699, doi:10.1029/2019GC008699, e2019GC008699 2019GC008699.

Abstract
Abstract The 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.
Further information
BibTeX
@article{id2610,
  author = {Edoardo Dallanave and Pierre Maurizot and Claudia Agnini and Rupert Sutherland and Christopher J. Hollis and Julien Collot and Gerald R. Dickens and Valerian Bachtadse and Dominic Strogen and Hugh E. G. Morgans},
  journal = {Geochemistry, Geophysics, Geosystems},
  note = {e2019GC008699 2019GC008699},
  number = {7},
  pages = {e2019GC008699},
  title = {{Eocene (46{--}44 Ma) Onset of Australia-Pacific Plate Motion in the Southwest Pacific Inferred From Stratigraphy in New Caledonia and New Zealand}},
  volume = {21},
  year = {2020},
  url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019GC008699},
  doi = {10.1029/2019GC008699},
}
EndNote
%0 Journal Article
%A Dallanave, Edoardo
%A Maurizot, Pierre
%A Agnini, Claudia
%A Sutherland, Rupert
%A Hollis, Christopher J.
%A Collot, Julien
%A Dickens, Gerald R.
%A Bachtadse, Valerian
%A Strogen, Dominic
%A Morgans, Hugh E. G.
%D 2020
%N 7
%V 21
%J Geochemistry, Geophysics, Geosystems
%P e2019GC008699
%Z e2019GC008699 2019GC008699
%T Eocene (46–44 Ma) Onset of Australia-Pacific Plate Motion in the Southwest Pacific Inferred From Stratigraphy in New Caledonia and New Zealand
%U https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019GC008699
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Printed 22. Oct 2020 23:53