Person:
Santisteban Navarro, Juan Ignacio

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First Name
Juan Ignacio
Last Name
Santisteban Navarro
URI
https://hdl.handle.net/20.500.14352/75187
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Geodinámica, Estratigrafía y Paleontología
Area
Estratigrafía
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1991 - 19963
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Item Type: Publication × Subject: 551.3.051(282.246.24) ×

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    El Paleógeno del sector suroccidental de la Cuenca del Duero: nueva división estratigráfica y controles sobre su sedimentación.
    (Acta geologica hispanica, 1991) Santisteban Navarro, Juan Ignacio; Mediavilla López, Rosa María; Martín Serrano, Ángel
    Como resultado de un detallado trabajo cartográfico, estratigráfico y sedimentológico, se propone la división del Paleógeno del sector suroccidental de la Cuenca del Duero en cuatro U.T.S. limitadas por discordancias. Estas D.T.S., que abarcan desde el tránsito Cretácico superior-Paleoceno hasta el Oligoceno, incluyen distintas unidades litoestratigráficas que sonreordenadas, modificando la sucesión estratigrática propuesta por los autores anteriores. Se asigna a la U.T.S. Me una edad Cretácico superior-Paleoceno. Se individualiza el Eoceno inferior (U.T.S. PI) en la zona de Salamanca. Se reinterpreta la relación existente entre los materiales del Eoceno mediosuperior y los del Eoceno superior-Oligoceno considerándolos en tránsito por lo que se asignan a una única U.T.S. (UT.S. P2, Eoceno medio Oligoceno inferior). Se incluyen en la U.T.S. P3 (Oligoceno superior) los sedimentos arcósicos anterionnente considerados como Vatlesienses. Así mismo, se considera que gran parte de los materiales asignados al mioceno inferior son sedimentos paleógenos afectados por un proceso de alteración de edad Miocena, lo que implica una variación en la extensión y límites de la cuenca neógena en su extremo SO. Se analiza la evolución de las distintas U.T.S. deduciendo un carácter tectónico para las megasecuencias propuestas relacionado con el progresivo levantamiento de las áreas fuente. El clima muestra un tránsito desde condiciones tropicales sin estaciones contrastadas (U,T.S. MC) hasta un clima mediterráneo árido (U.T.S. P3) con una estación seca muy marcada y una corta estación húmeda caracterizada por violentas avenidas. [ABSTRACT] A Paleogene four-fold stratigraphical division is proposed here as result fram the detailed studies carried out during the elaboration of 22 sheets of the Geological Map of Spain (E. 1 :50.000). This units (T.S.U.) are limited by regional discordances and they have a Upper Cretaceous to Oligocene ages. The previous stratigraphical schemes are rearranged due to the different stratigraphical relations observed between the lithostratigraphical units proposed by other workers (Jiménez, 1970; Corrochano, 1977; Alonso, 1981...). An Upper Cretaceous-Paleocene age is assumed to T.S.U. MC which is mainly composed by siliciclastic sediments strongly silicified forming a FU megasequence. It is intcrpretated as braided streams that flowed downslope filling paleovalleys erodcd onto Paleozoic materiaIs. Mineralogical features point to a tropical climate. Lower Eocene (T.S.U. P I ) is identified in the Salamanca area, where ir was considered as lacking. It is composed by arkosic sediments forming a CU megasequence. Fossil faunas of this T.S.U. record a subtropical clima te. It is observed a transition from high sinuosity streams to braided ones. T.S.U. P2 (Middle Eocene-Lower Oligocene) is composed of two lithostratigraphical units previously considered as bounded by a discordance (Alonso, 1981).It has a subarkosic to lithic nature and forms a CU megasequence. This unit records a subtropical climate with short arid periods and is interpretated as braided streams showing an increasing stability and enviromental energy to the topo T.S. U. P3 (Upper Oligocene) is composed by arkosic sediments previously considered of Vallesian (Middle to Upper Miocene) age. They form a CU megasequence that records braided streams prograding basinwardfrom higher arcas. Palinological associations and pedological features indicate an arid mediterranean climate with long arid periods and a short rainy season with strong floods. We consider that most of Lower Miocene sediments are of Paleogene age. They are afected by a widespread alteration profile developed along Lower Miocene that masked its more significative features. Sedimentological analysis of T.S.U. shows that its megasequentiality is related to the rates of tectonical uplift of source arcas whereas a distensive regime developed in the sedimentation basin.
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    Cenozoic lacustrine deposits in the Duero Basin (Spain)
    (Global geological record of lake basins, 1994) Mediavilla López, Rosa María; Martín Serrano, Ángel; Dabrio González, Cristino José; Santisteban Navarro, Juan Ignacio; Gierlowski-Kordesch , E.; Kelts, K.
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    The Duero Basin: a general overview
    (Tertiary basins of Spain : the stratigraphic record of crustal kinematics / edited by Peter F. Friend and Cristino J. Dabrio, 1996) Santisteban Navarro, Juan Ignacio; Mediavilla López, Rosa María; Martín Serrano, Ángel; Dabrio González, Cristino José; Freend, Peter F.; Dabrio, Cristino J.
    The Duero basin occupies a large area in the north-west of the Iberian Península. It has ao approximately quadrangular shape, and three of its four corners are the sites of distinctive sub-basins that extend outwards from the main basic. The different margins of lhe sub-basins and the main basic tend to have distinctive histories of tectonic and sedimentary evolution.