Depositional models of lacustrine evaporites in the SE margin of the Ebro Basin (Paleogene, NE Spain)
DOI:
https://doi.org/10.1344/105.000000307Keywords:
Evaporites, Gypsum, Saline lake models, Eocene, OligoceneAbstract
An important evaporitic sedimentation occurred during the Paleogene (Eocene to lower Oligocene) in the Barberà sector of the southeastern margin of the Tertiary Ebro Basin. This sedimentation took place in shallow lacustrine environments and was controlled by a number of factors: 1) the tectonic structuration of the margin; 2) the high calcium sulphate content in the meteoric waters coming from the marginal reliefs; 3) the semiarid climate; and 4) the development of large alluvial fans along the basin margin, which also conditioned the location of the saline lakes. The evaporites are currently composed of secondary gypsum in surface and anhydrite at depth. There are, however, vestiges of the local presence of sodium sulphates. The evaporite units, with individual thicknesses ranging between 50 and 100 m, are intercalated within various lithostratigraphic formations and exhibit a paleogeographical pattern. The units located closer to the basin margin are characterized by a massive gypsum lithofacies (originally, bioturbated gypsum) bearing chert, and also by meganodular gypsum locally (originally, meganodules of anhydrite) in association with red lutites and clastic intercalations (gypsarenites, sandstones and conglomerates). Chert, which is only linked to the thickest gypsum layers, seems to be an early diagenetic, lacustrine product. Cyclicity in these proximal units indicates the progressive development of low-salinity, lacustrine bodies on red mud flats. At the top of some cycles, exposure episodes commonly resulted in dissolution, erosion, and the formation of edaphic features. In contrast, the units located in a more distal position with regard to the basin margin are formed by an alternation of banded-nodular gypsum and laminated gypsum layers in association with grey lutites and few clastic intercalations. These distal units formed in saline lakes with a higher ionic concentration. Exposure episodes in these lakes resulted in the formation of synsedimentary anhydrite and sabkha cycles. In some of these units, however, outer rims characterized by a lithofacies association similar to that of the proximal units occur (nodular gypsum, massive gypsum and chert nodules).
References
Anadón, P., 1978. El Paleógeno inferior anterior a la transgresión “biarritziense” (Eoceno medio) entre los ríos Gaià y Ripoll (Provincias de Tarragona y Barcelona). Estudios Geológicos, 34, 431-440.
Anadón, P., Cabrera, L., Guimerà, J., Santanach, P., 1985. Paleogene strike-slip deformation and sedimentation along the southeastern margin of the Ebro Basin. In: Biddle, K., Christie-Blick, N. (eds.). Strike-slip deformation, basin formation and sedimentation. Society of Economic Paleontologists and Mineralogists, Special Publication, 37, 303-318.
Cabrera, Ll., Roca, E., Garcés, M., de Porta, J., 2004. Estratigrafía y evolución tectonosedimentaria oligocena superiorneógena del sector central del margen catalán (Cadena Costero-Catalana). In: Vera, J.A. (ed.). Geologia de España. Madrid, Sociedad Geológica de España-Instituto Geológico y Minero de España, 569-573.
Colldeforns, B., Mata-Perelló, J.M., 1987. Inventari mineralògic de la Comarca de la Segarra. Xaragall, 18, 1-31.
Colldeforns, B., Anadón, P., Cabrera, L., 1994a. Litoestratigrafía del Eoceno superior-Oligoceno inferior de la zona oriental de la Cuenca del Ebro. Sector Igualada-Santa Coloma de Queralt. Geogaceta, 15, 55-58.
Colldeforns, B., Anadón, P., Cabrera, L., 1994b. Nuevos datos sobre la litoestratigrafía del Eoceno-Oligoceno inferior de la zona suroriental de la Cuenca del Ebro (Sector Pontils-Montblanc, provincias de Tarragona y Barcelona). Geogaceta, 16, 98-101.
Colombo, F., 1980. Estratigrafía y sedimentologia del Terciario inferior continental de los Catalánides. Doctoral thesis. Universitat de Barcelona, 608 pp.
Colombo, F., 1986. Estratigrafía y sedimentología del Paleógeno continental del borde meridional occidental de los Catalánides (prov. Tarragona, España). Cuadernos de Geología Ibérica, 10, 5-115.
Gómez, M., Guimerà, J., 1999. Estructura alpina de la Serra de Miramar y del NE de las Muntanyes de Prades (Cadena Costero Catalana). Revista Sociedad Geológica España, 12, 405-418.
Guimerà, J., 2004. La Cadena Costero Catalana. In: Vera, J.A. (ed.). Geologia de España. Madrid, Sociedad Geológica de España-Instituto Geológico y Minero de España, 603-605.
Inglès. M., Ortí, F., Rosell, L., 1991. Estudio preliminar de las lutitas de las unidades evaporíticas en el borde SE de la Cuenca del Ebro (Paleógeno continental). I Congreso Español del Terciario, Vic (Barcelona), Libro Comunicaciones, 170-173.
IGME, 1944. Mapa Geológico de España. Scale 1:50.000. Memoria de la Hoja nº 390 (Cervera).
Julivert, M., 1954. Estratigrafía del Eoceno-Oligoceno entre el Francolí y el Anoia. Instituto Geologia Diputación Provincial Barcelona, Memorias y Comunicaciones, 11, 5-22.
López-Blanco, M., 2002. Sedimentary response to thrusting and fold growing on the SE margin of the Ebro basin (Paleogene, NE Spain). Sedimentary Geology, 146, 133-154.
Ortí, F., 1990. Las formaciones evaporíticas del Terciario continental de la zona de contacto entre la Cuenca del Ebro y los Catalánides. In: Ortí, F., Salvany, J.M. (eds.). Formaciones evaporíticas de la Cuenca del Ebro y cadenas periféricas, y de la zona de Levante. Barcelona, ENRESA-Universidad de Barcelona, 70-75.
Ortí, F., 1997a. Evaporite Sedimentation in the South Pyrenean Foredeeps and the Ebro Basin During the Tertiary: A General View. In: Busson, G., Schreiber, B.C. (eds.). Sedimentary Deposition in Rift and Foreland Basins in France and Spain. New York, Columbia University Press, 319-334.
Ortí, F., 1997b. Continental Evaporitic Sedimentation on the South East Border of the Ebro Basin (Catalanides) During the Paleocene to Lower Oligocene. In: Busson, G., Schreiber, B.C. (eds). Sedimentary Deposition in Rift and Foreland Basins in France and Spain. New York, Columbia University Press, 388-396.
Ortí, F., 2000. Unidades glauberíticas del Terciario Ibérico: nuevas aportaciones. Revista de la Sociedad Geológica de España, 13(2), 227-249.
Ortí, F., Rosell, L., 2000. Evaporative systems and diagenetic patterns in the Calatayud Basin (Miocene, central Spain). Sedimentology, 47, 665-685.
Ortí, F., Rosell, L., Anadón, P., 2003. Deep to shallow lacustrine evaporites in the Libros Gypsum (southern Teruel Basin, Miocene, NE Spain): an occurrence of pelletal gypsum rhythmites. Sedimentology, 50, 361-386.
Ortí, F., Pueyo, J.J., Geisler-Cusey, D., Dulau, N., 1984. Evaporitic sedimentation in the coastal salinas of Santa Pola (Alicante, Spain). Diputación Provincial Barcelona, Revista Instituto Investigaciones Geológicas, 38-38, 169-220.
Ortí, F., Rosell, L., Salvany, J.M., Inglès, M., 1997. Chert in Continental Evaporites of the Ebro and Calatayud Basins (Spain): Distribution and Significance. In: Ramos-Millán, A., Bustillo, M.A. (eds.). Siliceous Rocks and Culture. Universidad de Granada, Monográfica Arte y Arqueología, 42, 75-89.
Ortí, F., Salvany, J.M., Rosell, L., Inglès, M., 1989. Sistemas lacustres evaporíticos del Terciario de la Cuenca del Ebro. Geogaceta, 5, 103-104.
Rodríguez-Aranda, J.P., Calvo, J.P., 1998. Trace fossils and rhizoliths as a tool for sedimentological and palaeoenvironmental analysis of ancient continental evaporite successions. Palaeogeography, Palaeoclimatology, Palaeoecology, 140, 383-399.
Salvany, J.M., 1989. Las formaciones evaporíticas del Terciario continental de la Cuenca del Ebro en Navarra y La Rioja. Litoestratigrafía, petrología y sedimentología. Doctoral thesis. Universitat de Barcelona, 397 pp.
Salvany, J.M., Muñoz, A., Pérez, A., 1994. Nonmarine evaporitic sedimentation and associated diagenetic processes of the southwestern margin of the Ebro Basin (Lower Miocene), Spain. Journal of Sedimentary Research, A64(2), 190-203.
Utrilla, R., Ortí, F., Pierre, C., Pueyo, J.J., 1991. Composición isotópica de la evaporitas terciarias continentales de la Cuenca del Ebro: relación con los ambientes deposicionales. Revista de la Sociedad Geológica de España, 4(3-4), 353-360.
Utrilla, R., Pierre, C., Ortí, F., Pueyo, J.J., 1992. Oxygen and sulphur isotope compositions as indicators of the origin of Mesozoic and Cenozoic evaporites from Spain. Chemical Geology (Isotope Geoscience Section), 102, 229-244.
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