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Sedimentation of a Lower Cretaceous (Aptian) coral mound complex, Zaraya Mountains, northern Spain

Published online by Cambridge University Press:  01 May 2009

P. A. Fernandez-Mendiola  and
J. Garcia-Mondejar
P. A. Fernandez-Mendiola
Affiliation:
Dpto. Estratigrafia, Geodinamica y Paleontologia, Universidad del Pais Vasco, Apartado 644, 48080 Bilbao, Spain
J. Garcia-Mondejar
Affiliation:
Dpto. Estratigrafia, Geodinamica y Paleontologia, Universidad del Pais Vasco, Apartado 644, 48080 Bilbao, Spain
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Abstract

A Lower Cretaceous mixed carbonate-siliciclastic sequence is well exposed in the Zaraya Mountains in Guipuzcoa Province, northern Spain. The sequence begins with interfingering deltaic platform facies and marine patch-reef carbonates. This unit is dominated by mudstones and sandstone with minor interbeds of shallow-water carbonates (calcareous mudstones and sandstones and grainstone-packstones). A thick mixed carbonate-terrigenous unit overlies the siliciclastics and is composed principally of limestones and marls. Periodic influx of terrigenous sediments over a dominantly carbonate sea-floor gave rise to repeated cycles typical of a mixed shallow-water platform. Demise of the southerly derived deltaic input allowed the development of a mainly carbonate third unit. Large (several metres across) bioherms resulted from high in situ organic productivity (mechanical breakage of bioclasts, algal-induced precipitation, trapping and baffling of lime mudstone). The mounds grew making up a coral carbonate mound complex. This prograded to the south, towards a small backreef basin, and slightly retreated in its forereef margin. A period of tectonic instability is thought to have been responsible for the drowning of the shallow-water complex, which was unable to keep pace with relative sea-level rise.

Type
Articles
Information
Geological Magazine , Volume 126 , Issue 4 , July 1989 , pp. 423 - 434
Copyright
Copyright © Cambridge University Press 1989

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References

Elliott, T. 1974. Interdistributary bay sequences and their genesis. Sedimentology 21, 611–22.CrossRefGoogle Scholar
Fernandez-Mendiola, P. A. 1987. El complejo urgoniano en el sector oriental del Anticlinorio de Bilbao. Kobie 16, 7–184.Google Scholar
Garcia-Mondejar, J. 1982. Aptiense–Albiense. In El Cretácico de España (Universidad Complutense de Madrid), pp. 63–84. Spanish Working Group, IGCP Mid Cretaceous Events Project no. 58.Google Scholar
James, N. P. 1978. Reefs. Geoscience Canada 5, 16–26.Google Scholar
James, N. P. 1983. Reef environment. In Carbonate Depositional Environments (ed. Scholle, P. A. Bebout, D. G. Moore, C. H.), pp. 345–440. American Association of Petroleum Geologists Special Memoir no. 33.Google Scholar
Maurin, A. F., Bernet-Rollande, M. C., Monty, C. L. V. & Nazhat, S. 1985. The microbial nature of bacinellid textures-sedimentological bearings. In Proceedings of the 6th European regional meeting of Sedimentology, Lerida, 1985, pp.285–7.Google Scholar
Montadert, L., Roberts, D. G., Decharpal, O. & Geunnoc, P. 1979. Rifting and subsidence of the northern continental margin of the Bay of Biscay. In Initial Reports of the Deep Sea Drilling Project 48 (ed. Montadert, L. Roberts, D. G.), pp. 1025–60. Washington: U.S. Government Printing Office.CrossRefGoogle Scholar
Pascal, A. 1985. Les systèmes biosedimentaires urgoniens (Aptien-Albien) sur le marge nord-ibérique. Mémoire géologique de l'université de Dijon no. 10, 561 pp.Google Scholar
Pratt, B. R. 1982. Stromatolitic framework of carbonate mud-mounds. Journal of Sedimentary Petrology 52, 1203–27.Google Scholar
Rat, P. 1959. Les Pays crétacés basco-cantabriques. Publications de l'université de Dijon no. 16, 525 pp.Google Scholar
Wilson, J. L. 1975. Carbonate Facies in Geologic History. Berlin: Springer-Verlag. 471 pp.CrossRefGoogle Scholar