Publication: Correlación secuencial de los depósitos
del Cenomanense inferior y medio
del Sistema Central, Cordillera Ibérica y Catalánides
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Publication Date
1994
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Editorial Complutense
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Abstract
Se correlaciona detalladamente el Cenomanense inferior y medio a lo largo de una transversal Este-Oeste a la Cuenca Ibérica, desde el Sistema Central hasta las Catalánides, identificándose ocho litosomas con rango de Miembro. Se identifica un conjunto inferior terrígeno, con tres Miembros, y otro superior principalmente dolomítico en el que se distinguen cinco Miembros; se reconoce además la presencia de cuatro Capas de margas (Chera, Pinarueco, Poveda y Pozuel). Este conjunto inferior terrígeno se incluye en la Fm. Arenas de Utrillas, y el conjunto superior dolomítico en la Fm. Dolomías de Cortes de Pallás. Estos materiales corresponden a dos secuencias deposicionales de 3er orden: Una basal, solo presente en la zona central, y formada casi exclusivamente por depósitos costeros, que se interpreta en función de datos regionales como una secuencia deposicional menor de 4. orden (parasecuencia). Y otra superior, mejor desarrollada y limitada por dos discontinuidades de extensión regional; en esta se pueden diferenciar hasta cuatro secuencias deposicionales menores, de 4º orden (parasecuencias), formadas, a su vez, por secuencias de orden menor (5º y 6º) que permiten interpretar las parasecuencias en términos de Cortejos Sedimentarios, en este caso de 42 orden. La parte superior de los materiales estudiados, principalmente calcárea, se interpreta como un Cortejo Sedimentario transgresivo (TST) y de alto nivel del mar (HST), correspondiente a un ciclo eustático de 3er orden, el cual estaría compuesto por Cortejos Sedimentarios menores de bajo nivel del mar (LST), transgresivos (TST) y de alto nivel del mar (HST) de 4º orden. La parte basal, principalmente margosa, se interpreta en parte, como el Cortejo de bajo nivel del mar (LST) que corresponde al ciclo de 3er Orden descrito anteriormente y en parte, al borde de un HST de 3541 orden infrayacente, sólo representado aquí por su parte más alta y en facies mas somera.
This paper deals with a detailed correlation of the Lower-Middle Cenomanian sediments along an East-West section of the Iberian Basin from the Central System to the Catalonian Ranges, where eight distinct lithosomes (Membcrs) have been distinguished. The base is composed of terrigenous sediments of the Utrillas Formation including three Members, and the marly and dolomitie Cortes de Pallás Formation, at the top, includes another five Menbers; besides four marly Beds (Chera, Pinarueco, Poveda and Pozuel) have been also distinguished. The entire succession is interpreted as composed by two 3rd order Depositional Sequences, each bounded by regional discontinuites. The basal Sequence appeas only in the central zone being composed exclusively by coastal sediments; it is interpreted as formed by a single parasequence of a Highstand System Tract (HST) weII-developed in other areas of thc basin (Maestrazgo). The upper Sequence is composed of four parasequences, being represented a Lowstand (LST), a Transgressive (TST) and a Highstand System Tracts (ItT). Parasequences are also composed of minor-order sequences (4th and Sth), whosc arrangement clearly suggest an interpretation based on System Tracts concepts; thus, there is 4th order LST, TST and HSTsuperimposed to the 3rd order Ssytems Tracts, being possible that a 4th order LST be included in a 3rd order HST.
This paper deals with a detailed correlation of the Lower-Middle Cenomanian sediments along an East-West section of the Iberian Basin from the Central System to the Catalonian Ranges, where eight distinct lithosomes (Membcrs) have been distinguished. The base is composed of terrigenous sediments of the Utrillas Formation including three Members, and the marly and dolomitie Cortes de Pallás Formation, at the top, includes another five Menbers; besides four marly Beds (Chera, Pinarueco, Poveda and Pozuel) have been also distinguished. The entire succession is interpreted as composed by two 3rd order Depositional Sequences, each bounded by regional discontinuites. The basal Sequence appeas only in the central zone being composed exclusively by coastal sediments; it is interpreted as formed by a single parasequence of a Highstand System Tract (HST) weII-developed in other areas of thc basin (Maestrazgo). The upper Sequence is composed of four parasequences, being represented a Lowstand (LST), a Transgressive (TST) and a Highstand System Tracts (ItT). Parasequences are also composed of minor-order sequences (4th and Sth), whosc arrangement clearly suggest an interpretation based on System Tracts concepts; thus, there is 4th order LST, TST and HSTsuperimposed to the 3rd order Ssytems Tracts, being possible that a 4th order LST be included in a 3rd order HST.