La ruptura de la plataforma carbonatada del Lías Inferior en el Subbético Oriental (Provincias de Murcia y Alicante): distribución de facies y valores isotópicos del 87Sr/86S r, C y O

L.M. Nieto ^[1] ; P.A. Ruiz-Ortiz ^[1] ; J. Rey ^[1] ; María Isabel Benito ^[2]
1. [1] Universidad de Jaén
  
  Universidad de Jaén
  
  Jaén, España
2. [2] Universidad Complutense de Madrid
  
  Universidad Complutense de Madrid
  
  Madrid, España
Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 7 (Simposio homenaje a D. Daniel Jiménez de Cisneros y Hervás), 2004 (Ejemplar dedicado a: VII Congreso Geológico de España), págs. 171-176
Idioma: español
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Resumen
- The carbonate rocks of the upper part of the Gavilán Fm from the Eastern Subbetic are studied.
  
  They have been dated as Early Pliensbachian (carixian) in age and they were deposited in a carbonate platform. The stratigraphic and facies analysis show that the general scheme proposed by Ruiz-Ortiz et al. (2004) for the middle and upper member of the formation, each of them interpreted as a depositional sequence, can be easily applied. Moreover, a third sequence can be differentiated from the unusual record of upper Carixian sediments in some of the studied sections. The evolution of the content in b,3C, b180 and 87Sr/86Sr, is also analyzed from belemnites rostra. The values of these isotope ratios range between their characteristic values for the Pliensbachian according to different authors. Some critical variations can be correlated with those proposed for equivalent ages by other authors.