Neogene Lacustrine Deposits of the North-Central Ebro Basin, Northeastern Spain

• Autores: María Concepción Arenas Abad, Gonzalo Martín Pardo Tirapu
• Localización: Lake basins through space and time / coord. por Elizabeth H. Gierlowski-Kordesch, K. Kelts, 2000, ISBN 0891810528, págs. 395-405
• Idioma: inglés
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• Dialnet Métricas: 1 Cita
• Resumen

  • The Ebro Basin is located in the northeastern sector of the Iberian península and is bounded by the Pyrenean Ranges to the north, Iberian Ranges to the south,and Catalan Coastal Ranges to the east (Figure 1). This basin originated during the Paleogene, and its evolution was mainly linked to the development of the Pyrenean orogeny (Riba et al., 1983), thus the basin represents the southern foreland basin of the Pyrenean Ranges. The Iberian Ranges and Catalan Coastal Ranges were also active margins but of less importance. From the latest Eocene to the late Miocene, the Ebro Basin was a closed intermontane basin. The depositional systems comprised alluvial fans sourced from the margins and connected to wide areas in the center of the basin occupied by lakes. During the late Oligocene and Miocene, Pyrenean source areas north of the Ebro Basin depositional system smainly included Paleozoic-early Oligocenesiliciclastic formations, Cretaceous and Paleogene calcareousformations, and Paleozoic igneous and metamorphicrocks. Iberian source areas in the south consisted of Paleozoic and Mesozoic siliciclastic and calcareous rocks; Triassic and Liassic formations containlarge volumes of evaporites.

    The sedimentary record of the related lacustrine systems mainly consists of sulfate and carbonate deposits. In the Aragonese central part of the basin,between the Pyrenean Ranges and the Iberian Ranges, Neogene carbonate deposits form prominent uplandsin the center of the basin (Figure 1): La Muela, La Plana, and La Muela de Borja south of the Ebro River ,and the Sierra de Alcubierre, Montes de Castejón, and Sancho Abarca-Plana Negra north of the Ebro River. Sulfate facies mostly crop out at the foothills of theseuplands and at the lowest parts of the basin (Figure 2).These lacustrine deposits may also intercalate with distal alluvial sediments.The aim of this contribution is to show the paleogeographic evolution of the latest Oligocene-late Miocene lacustrine systems of the north-central part of the Ebro basin (Sierra de Alcubierre, Montes de Castejon, and their foothills) and the related northern alluvialsystems, directly linked to the Pyrenean margin.This study also contributes to the correlation between the northern and southern areas of the Ebro Basin, the Pyrenean and Iberian domains, respectively. The mainstratigraphic and sedimentologic data of the Iberian area are shown in Pérez et al. (1994),as well as in Pérez et al.(1988), Pérez (1989), and Villena et al. (1992; 1996a, b).