Ciclicidad climática en una unidad lacustre cretácicala Fm. Villanueva de Huerva en la Subcuenca de Aguilón (Cordillera Ibérica)

  1. Ana Rosa Soria de Miguel 1
  2. Arsenio Muñoz Jiménez 1
  3. Carlos Luis Liesa Carrera 1
  4. Aránzazu Luzón Aguado 1
  5. Alfonso Meléndez Hevia 1
  6. M. Nieves Meléndez Hevia 2
  7. R. Soto Marín 3
  1. 1 Dpto. Ciencias de la Tierra. Fac. de Ciencias, Universidad de Zaragoza
  2. 2 Dpto. Estratigrafía. Fac. de Geología-Inst. Geol. Económica CSIC-UCM
  3. 3 Dpto. Física. Facultad de Ciencias. Universidad de Burgos
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Revue:
Geotemas (Madrid)

ISSN: 1576-5172

Année de publication: 2008

Titre de la publication: VII Congreso Geológico de España

Número: 10

Pages: 1487-1490

Type: Article

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D'autres publications dans: Geotemas (Madrid)

Résumé

The Villanueva de Huerva Fm. (Valanginian to middle Hauterivian in age) is a lacustrine sinrift unit (with a sedimentary rate from 2 to 2,6 cm/1000 yr) of the Aguilón Subbasin infill (central Iberian Chain). A 49 m-thick interval integrated by 88 cycles of marl - laminated limestons- massive limestons – bioturbated and/or brecciated limestones, that represent typical shallowing-upward sequences, can be identified in this unit. The high-resolution stratigraphic analysis of the cyclic interval has allowed to analyse the role played by climate in sedimentation. A schematic sedimentological model is proposed based on both the vertical relation among facies and their interpretation. In such a model the relative spatial position of the distinct facies with respect to the coastline of the lake is interpreted and these data have been used as the basis to elaborate the time series for the spectral analysis. Taking into account the estimated sedimentary rate we deduce that the shallowing-upward basic sequence recognised in the studied interval fits well with the Milankovitch frequency band. The obtained ratios between the cycles are 4.5:1, 3.4:1 and 1.3:1. The two first ratios can be interpreted as the eccentricity/precession ratios, while the last one could be related to the ratio between the two modes of the precession cycle.

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