Registro de la variabilidad climática de escala milenaria en el último ciclo glaciar en los sedimentos de la cuenca Argelo-Balear

  1. J. Frigola 1
  2. A. Moreno 2
  3. M. Canals 1
  4. I. Cacho 1
  5. E. Colmenero 3
  6. F. Sierro 3
  7. J.A. Flores 3
  1. 1 Universitat de Barcelona
    info

    Universitat de Barcelona

    Barcelona, España

    ROR https://ror.org/021018s57

  2. 2 Instituto Pirenaico de Ecología, CSIC
  3. 3 Dpto. de Geología, Universidad de Salamanca
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Zeitschrift:
Geotemas (Madrid)

ISSN: 1576-5172

Datum der Publikation: 2004

Titel der Ausgabe: VI CONGRESO GEOLÓGICO DE ESPAÑA, ZARAGOZA, 12-15 JULIO, 2004

Nummer: 6

Seiten: 97-100

Art: Artikel

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Andere Publikationen in: Geotemas (Madrid)

Zusammenfassung

Sediments from MD 99-2343 IMAGES core recovered in the Algero-Balearic Basin, north of the island of Menorca, have been analyzed for their bulk element composition and grain-size distribution to characterize the temporal evolution of the terrigenous input to this area throughout the last50 ka. The high-resolution elementary profiles show high frequency oscillations, particularly of Si,Ti and K contents, associated with terrigenous input variability. These fluctuations mark significant changes in the source areas and/or in the nature of transport and sedimentation processes mostlikely related to abrupt changes in oceanographic and atmospheric conditions. The Menorca corerecords were compared with the geochemical results of a previously studied core from the Albo-ran Sea, from where it became obvious a similar behaviour in some of the terrigeneous elementsat both core locations. The obtained records vary with a clear Dansgaard-Oeschger periodicity reaching higher values during the North Atlantic's Heinrich Events. These results evidence the presence of a millennial-scale synchronous pattern in the Western Mediterranean in terms of deposition of terrigenous material. In addition, grain-size analyses of Menorca core reveal rhythmic episodes of coarser particle inputs during the Holocene likely related to shifts in the intensity of deep-water currents.

Fuente de los datos: Dialnet