Resumen de Correlación litoestratigráfica entre las sucesiones mesozoicas de la isla de Ibiza y el Prebético de Alicante

José Alberto Díaz de Neira, Javier Gil Gil

• español

  Todas las unidades litoestratigráficas mesozoicas de la isla de Ibiza tienen un claro equivalente en el Prebético de Alicante. Los materiales más antiguos corresponden al Triásico de facies Muschelkalk y Keuper. El Jurásico de Ibiza (excepto el Titoniense) está integrado por las dolomías de Port de Ses Caletes, las calizas nodulosas y lutitas rojas de Es Botafoch y la ritmita calcárea de Dalt Vila, que en Alicante se correlacionan, respectivamente, con tres unidades: dolomías y calizas dolomíticas, calizas nodulosas y ritmita calcárea. En el sector meridional de ambas regiones, el Titoniense-Cretácico Inferior se caracteriza por una sucesión rítmica de margas y calizas margosas (Formación Es Cubells en Ibiza y Ritmita margo-calcárea en Alicante), que en Ibiza pasa hacia el norte a las formaciones Calizas de Punta Jondal y Calizas de Port Sant Miquel, correlacionables con las formaciones Sierra del Pozo y Arroyo de los Anchos del Prebético de Alicante, respectivamente. En Ibiza, el Cretácico Superior está representado por la Formación Calizas de Llentrisca, cuya correlación es menos evidente. La semejanza litoestratigráfica entre los materiales mesozoicos de la isla de Ibiza y los de la transversal de sierra de Mariola-Alicante, refuerzan la idea de que Ibiza constituye la prolongación nororiental del Prebético de Alicante.

• English

  All the Mesozoic lithostratigraphic units with range of formation recognized in the island of Ibiza have a clear equivalent in the Sierra de Mariola-Alicante cross section of the Prebetic of Alicante. Generally, they are very similar in lithofacies, thickness, age and sedimentary environment. Both in Ibiza and in the Prebetic of Alicante, the most ancient rocks are the carbonate rocks of the Muschelkalk facies, and above the Keuper facies, constituted by clays and gypsum. The Jurassic of Ibiza (except the Tithonian) is integrated by two thick carbonate units, the Port de Ses Caletes dolostones and the Dalt Vila calcareous rhythmite; between both units is located the Es Botafoch nodular limestones and red shales. In the Alicante region, the Jurassic succession is represented by three equivalent units: dolostones and dolomitic limestones and calcareous rhythmite, between which the nodular limestones unit is present. The record of the Tithonian-Early Cretaceous shows a diversification of the platform environments, increasing towards the south the distance to the coastline. The southern sector of both domains is characterized by a thick rhythmic succession of hemipelagic marls and marly limestones (Es Cubells Formation in the island of Ibiza; rhythmite of marls and marly limestones in Alicante); northwestwards, it changes laterally to many carbonate units. In Ibiza, the rhythmite evolves northwards to the limestones and dolostones of the Punta Jondal Formation (Tithonian-lower Valanginian), and then, to the limestones of the Port Sant Miquel Formation (Aptian); both carbonate units are equivalents to the Sierra del Pozo and Arroyo de los Anchos formations, respectively. In the island of Ibiza, the Port Sant Miquel Formation is integrated by two urgonian carbonate members (Torre des Molar and Cala d’en Sardina) separated by a marly level (Penyal de s’Águila Member), like the Arroyo de los Anchos Formation have two carbonate formations (Llopis and Seguilí) individualized by a marly unit (Almadich Formation). The Late Cretaceous is represented in Ibiza by the limestones of the Llentrisca Formation with a small outcrop area. In this time, the Prebetic of Alicante shows a major variability of lithofacies, both vertically and laterally. The equivalent of Llentrisca Formation is not so clear as in the Middle Triassic-Early Cretaceous succession. Lithostratigraphic similarity between the mesozoic rocks in Ibiza and the Sierra de Mariola-Alicante cross section reinforces the hypothesis that the island of Ibiza constitutes the northeastern prolongation of the Prebetic of Alicante.