Astronomical cyclicity and sapropels in the pre-evaporitic Messinian of the Sorbas basin (Western Mediterranean)

  1. Sierro, E.J. 1
  2. Flores, J.A. 1
  3. Zamarreño, I. 2
  4. Vázquez, A. 2
  5. Utrilla, R. 2
  6. Francés, G. 3
  7. Hilgen, F. 4
  8. Krijgsman, W. 4
  1. 1 Universidad de Salamanca, España
  2. 2 Instituto Jaime Almera, Barcelona, España
  3. 3 Universidad de Vigo, España
  4. 4 Utrecht University, Países Bajos
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Revista:
Geogaceta

ISSN: 0213-683X

Ano de publicación: 1996

Título do exemplar: 21a Sesión Científica, Huelva 1996

Número: 21

Páxinas: 199-202

Tipo: Artigo

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Outras publicacións en: Geogaceta

Resumo

A high resolution study of the Messinian pre-evaporitic marls of the Sorbas basin was carried out with the main object of analysing the high frequency cyclicity identified in this basin. In the lower part of the succession, sedimentary cycles are characterised by an alternation of induratect opal-rich layers and homogeneous marls. In the upper patt, sapropels have been identified in the middle part of the cycles. These cycles have an average duration of 23,500 years and therefore a relatíon to precession variations in the Earth's orbit may be inferred Quantitative analyses of the planktic Foraminifera and Nannofossil assemblages suggest the occurrence of strong environmental fluctuations in the basin before the Messinian Salinity Crisis.

Fonte de datos: Dialnet