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| Sutherland, Rupert; Collot, Julien; Lafoy, Yves; Logan, Graham A.; Hackney, Ron; Stagpoole, Vaughan; Uruski, Chris; Hashimoto, Takehiko; Higgins, Karen; Herzer, Richard H.; Wood, Ray; Mortimer, Nick; Rollet, Nadege. |
| We use seismic reflection and rock sample data to propose that the first-order physiography of New Caledonia Trough and Norfolk Ridge formed in Eocene and Oligocene time and was associated with the onset of subduction and back-arc spreading at the Australia-Pacific plate boundary. Our tectonic model involves an initial Cretaceous rift that is strongly modified by Cenozoic subduction initiation. Hence, we are able to explain (1) complex sedimentary basins of inferred Mesozoic age; (2) a prominent unconformity and onlap surface of middle Eocene to early Miocene age at the base of flat-lying sediments beneath the axis of New Caledonia Trough; (3) gently dipping, variable thickness, and locally deformed Late Cretaceous strata along the margins of the trough;... |
| Tipo: Text |
Palavras-chave: Norfolk ridge system; Back arc extension; New zealand region; South fiji basin; Sw pacific; Northland plateau; Tasman sea; Seismic stratigraphy; Geodynamic ecolution; Tectonic evolution. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00001/11271/9283.pdf |
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| Calvo, Eva; Pelejero, Carles; De Deckker, Patrick; Logan, Graham A.. |
| Comparison of ice cores from Greenland and Antarctica shows an asynchronous two-step warming at these high latitudes during the Last Termination. However, the question whether this asynchrony extends to lower latitudes is unclear mainly due to the scarcity of paleorecords from the Southern Hemisphere. New data from a marine core collected off South Australia (similar to 36 degrees S) allows a detailed reconstruction of sea-surface temperatures over the Last Termination. This confirms the existence of an Antarctic-type deglacial pattern and shows no indication of cooling associated with the Northern Hemisphere YD event. The SST record also provides a new comparison with the more extensive paleoclimatic data available from continental Australia. This shows a... |
| Tipo: Text |
Palavras-chave: Alkenones; Deglaciation; Southern Hemisphere. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00235/34647/33013.pdf |
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