Corriente Circumpolar Antártica durante el Oligoceno-Mioceno inferior.

  1. D. Evangelinos 1
  2. C. Escutia 1
  3. T. van de Flierdt 2
  4. J. Etourneau 1
  5. J.A. Flores 3
  6. L. Valero 4
  7. F. Hoem 5
  8. P. Bijl 5
  9. K. Kreissig 2
  10. K. Kerr 6
  11. L. Holder 2
  12. A. López-Quirós 1
  13. A. Salabarnada 1
  1. 1 Instituto Andaluz de Ciencias de la Tierra, CSIC-Univ. de Granada
  2. 2 Imperial College London
    info

    Imperial College London

    Londres, Reino Unido

    ROR https://ror.org/041kmwe10

  3. 3 Universidad de Salamanca
    info

    Universidad de Salamanca

    Salamanca, España

    ROR https://ror.org/02f40zc51

  4. 4 Université de Genève
    info

    Université de Genève

    Ginebra, Suiza

    ROR https://ror.org/01swzsf04

  5. 5 Utrecht University
    info

    Utrecht University

    Utrecht, Holanda

    ROR https://ror.org/04pp8hn57

  6. 6 Open University
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Revista:
Geotemas (Madrid)

ISSN: 1576-5172

Any de publicació: 2021

Títol de l'exemplar: X Congreso Geológico de España

Número: 18

Pàgines: 1125

Tipus: Article

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Altres publicacions en: Geotemas (Madrid)

Resum

The establishment of a strong and deep-reaching Antarctic Circumpolar Current (ACC) flow is still poorly understood. Sediments collected by the Deep Sea Drilling Project (DSDP) at Sites 278 and 274 provide an opportunity to reconstruct the evolution of the ACC in the Southwest Pacific Ocean. Here we use neodymium (Nd) isotope ratios from fossil fish teeth/ bone debris from two Oligocene-early Miocene sections (33-19 Ma) to trace the evolution of the Circumpolar Deep Water (CDW) (which covers the deeper layers of the ACC). In combination with other Nd isotope data from the Southern Ocean, our results show that CDW had a more radiogenic Nd isotope signal in the eastern side of the Tasmanian Gateway than in the western part, indicating provinciality in the Nd isotopes on both sides of the gateway between 31 to 19 Ma. This contrasts with the homogenous modern CDW Nd isotopic composition in the Southern Ocean. Our data suggest a weaker ACC than today between the Oligocene and at least the early Miocene. This implies that the establishment of the modern-like, strong, deep-reaching ACC may have occurred sometime during the Neogene.

Fuente de los datos: Dialnet