Rhythmically Laminated Lacustrine Carbonates in the Lower Cretaceous of La Serranía de Cuenca Basin (Iberian Ranges, Spain)

  1. P. Anadón,
  2. Li. Cabrera and
  3. K. Kelts
  1. J. C. Gómez Fernández and
  2. N. Meléndez

Published Online: 14 APR 2009

DOI: 10.1002/9781444303919.ch12

Lacustrine Facies Analysis

Lacustrine Facies Analysis

How to Cite

Gómez Fernández, J. C. and Meléndez, N. (1991) Rhythmically Laminated Lacustrine Carbonates in the Lower Cretaceous of La Serranía de Cuenca Basin (Iberian Ranges, Spain), in Lacustrine Facies Analysis (eds P. Anadón, Li. Cabrera and K. Kelts), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444303919.ch12

Author Information

  1. Departamento de Estratigrafia, Universidad Complutense, 28040 Madrid, Spain

Publication History

  1. Published Online: 14 APR 2009
  2. Published Print: 6 SEP 1991

ISBN Information

Print ISBN: 9780632031498

Online ISBN: 9781444303919

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Keywords:

  • lacustrine varves;
  • calcarenite beds and algal limestones, representing shallower areas of lake;
  • rhythmically laminated carbonate sediments, common feature of lakes situated in temperate zone;
  • aulacogen, evolving during Early Triassic;
  • lacustrine deposits, being carbonates;
  • Upper Unit in Las Hoyas section, consisting limestones;
  • laminated lacustrine carbonates - Lower Cretaceous of La Serrania de Cuenca Basin

Summary

Lacustrine carbonate deposits are well represented in the Lower Cretaceous of the Iberian Ranges, eastern Spain. Previously, only shallow lacustrine carbonate deposits have been described from the Iberian Basin, and interpreted as deposits of hard water, shallow lakes and wide, ponded alluvial plains. This paper deals with some of these carbonates located in La Serranía de Cuenca, in the northwestern part of the Iberian Ranges.

A notable feature of the lacustrine Upper Hauterivian? to Lower Barremian La Huerguina Formation, in La Serranía de Cuenca Basin, is the presence of rhythmically laminated limestones interpreted as lacustrine varves. The existence of these lacustrine varves and the preservation of different organisms (especially fish), suggest that thermal stratification of an open lake produced anoxic bottom conditions. Other evidence to support this interpretation includes the absence of bioturbation and high organic matter content. Irregular slabby limestones were deposited below the euphotic zone. Calcarenite beds and algal limestones represent shallower areas of the lake. This lake was surrounded by palustrine areas and a distal alluvial carbonate plain.