Evolución cenozoica de la Depresión Intermedia (Cuenca-Guadalajara)

En este trabajo se analiza la evolución Cenozoica de la Depresión Intermedia, habiéndose determinado la existencia de dos ciclos paleógenos y cuatro neógenos. En todos ellos la sedimentación es continental y de carácter fluvial y lacustre-palustre. Si se exceptúa el Primer Ciclo Paleógeno, que tuvo su área fuente en una zona al sur de la cuenca en la que predominaban rocas paleozoicas, los cinco restantes las tuvieron en el Sistema Ibérico, donde predominan rocas mesozoicas

Cenozoic lacustrine deposits in the Duero Basin (Spain)

Depto. de Geodinámica, Estratigrafía y PaleontologíaFac. de Ciencias GeológicasTRUEpu

Yacimientos de Carofitas en la Depresión Intermedia (Cuenca Guadalajara,España Central)

This paper deals with the study of some Charophyta associated to some tertiary mammal sites in the Depresi6n Intermedia Basin. It has been made a first attemp to correlate micromammal biozones with Charophyta biostratigraphical distribution. All the ages obtained from Charophyta assemblages cover longer periods than studies based on micromammals. However, data obtained from Albalate-7 site might show an accurate age that could be situated in biozone Eof Daams and Freudenthal (7987) (Middle Aragonian). Three sites whose ages were not clearly determined have been eventually dated, two of them of Upper Cretaceous age

Up-to-date Spanish continental Neogene synthesis and paleoclimatic interpretation

A synthesis of the Spanish continental Neogene is presented by designing an integrated correlative chart of the Neoc "gen-e -succes-siuns-ofthe -lberian-PeninsuIa-.-Ninemain-sedimentary-breaks-have-been-distinguished-in-most-of-the-basins~ -'I'hey are considered a valuable criteria for correlation as they occur in similar time intervals from basin to basin. The determined sedimentary breaks occur in the Agenian, Ramblian, Middle Aragonian, Late Aragonian, Late Vallesian, Middle Turolian, Late Turolian, Late Ruscinian-Early Villafranchian, and Villafranchian ages. The larger interior basins (Ebro, Tajo, Duero) show a fairly complete Neogene sedimentary record in which the above mentioned sedimentary breaks are usually well recognized. A good correlation may be established from basin to basin. Likewise, there is a fairly good correlation among the Upper Miocene- Pliocene sedimentary record of basins spreading out in Levante and southeastern Spain. However, the correlation is not as clear in those basins located within the Iberian and Catalan Coastal Ranges, which usually do not show a similar sedimentary pattern. The comparison between Neogene stratigraphic logs in most of the Spanish continental basins and the pattern of global events from currently accepted Cenozoic Cycle Charts allows recognition of chronological coincidences, especially with regard to the age of seven major sedimentary ruptures (those developed at about 24.5 Ma, 22 Ma, 16 Ma, 13.5 Ma, 9.5 Ma, 5.5 Ma, 3.3 Ma). Evolutionary sedimentary trends in both offshore Mediterranean areas and inland peripheral zones of the Iberian Peninsula show also striking coincidences regarding the chronology of major sedimentary breaks observed in continental successions. Paleoclimatic curves for the Spanish continental Neogene display four relative temperature peaks indicative of warm climatic conditions (Late Agenian, Early-Middle Aragonian, Vallesian-Turolian, and Late Villafranchian) as well as five relatively dry periods (Early Ramblian, Middle-Late Aragonian, Middle Turolian, Late Ruscinian, and Middle Villafranchian ages)

La Ciénaga de Córcoles: un área de sedimentación lacustre-palustre en el Mioceno (Aragoniense inferior-medio) de la Depresión Intermedia (Guadalajara)

Las ciénagas de Córcoles son depósitos lacustres-palustres del terce Ciclo Neógeno de la Depresión Intermedia (Aragoniense inferior medio). Estuvieron distalmente relacionadas con el abanico aluvial, aunque rodeadas de un paisaje árido. las concentraciones singenéticas de metales sugiere que también tuvieron aportes de aguas termales

Nuevas acotaciones del alcance del método de datación por análisis de racemización de aminoácidos: sección de Cuesta Colorada(Almería SE de España)

New data about the age of Cuesta Colorada (Almería, Spain) are presented. Evidency from micropaleontological sampling and new palaeomagnetical studies, allowed us to correlate the almost whole section with the I and 11 Pliocene Units. An undoubtfull palaeomagnetical reversal found in an intensively sampled micritic layer, could represent the Gauss-Matuyama boundary, confirming the data from amino acid racemization analyses which indicate a wide time span between both the bottom and the top of Cuesta Colorada deposition time. Samples taken from a very deeply excavated road cut allowed very well preserved amino acid and palaeomagnetic samples taking, being possible to enlarge the normal amino acid dating method range which in very favourable conditions could reach the upper part of Lower Pleistocene time

Contribuciones a la paleontología de Mallorca

Abstract not availabl

Floristic changes in the Iberian Peninsula and Balearic Islands (south-west Europe) during the Cenozoic

AIM  The aim of this work was to identify the main changes in the flora and vegetation of the Iberian Peninsula over the Cenozoic Era, to record the disappearance of taxa associated with these changes and to determine the influence of climate and human activity on these events. Location  The Iberian Peninsula and Balearic Islands. METHODS  A critical review was made of the palaeobotanical literature with the aims of detecting patterns of floristic change and extracting information on the disappearance of different taxa over the Cenozoic. These data are viewed alongside the most recent data for the climate of this period. A critical analysis is made of the role of Palaeotropical and Arctotertiary taxa in the forest communities of the Iberian Peninsula throughout the Cenozoic. RESULTS  Although the Eocene–Oligocene transition was a time when many taxa disappeared, the most outstanding events occurred between the end of the Oligocene and throughout the Miocene. Substantial floristic changes took place over this period, including the disappearance of 177 Palaeotropical taxa. This was probably related to acute cooling and aridification; no evidence exists that the Messinian Salinity Crisis had any important effect in the Iberian Peninsula. The last great disappearance of Palaeotropical taxa (36 in total) ended in the Middle–Late Piacenzian; Arctotertiary taxa were most affected during the Pleistocene. The Lower–Middle Pleistocene transition, best represented by marine isotopic stages (MIS) 36–34 and 20–18 and characterized by a change in glacial cyclicity, was the time of the last notable disappearance of taxa. MAIN CONCLUSIONS  This work provides the first chronogram of extinctions for the Iberian flora, and records the disappearance of 277 taxa during the Cenozoic. A clear relationship was detected between the main climatic events and the latest appearances of the different taxa

Fracturación y control tectosedimentario neógeno en el borde sureste de la Cuenca de Lorca

En este trabajo se estudia el control tectosedimentario ejercido por la fracturación neógena en la sedimentación en el borde suroriental de la Cuenca de Larca. El control más importante está impuesto por la actividad del Corredor Tectónico de la Falla de Alhama de Murcia. Este corredor controló la formación del borde sur de la citada cuenca a través de movimientos de carácter normal que activaron el inicio del depósito mioceno. Durante el Tortoniense y el Messiniense la cinemática sinestral e inversa del corredor controla la formación del anticlinal que estructura la Sierra de La Tercia y provoca reactivaciones de procesos erosivos en áreas emergidas

Geología y composición de materias primas magmáticas neógenas de Cataluña

El volcanismo neógeno catalán se divide en 3 áreas: Cordillera Transversal o área de La Garrotxa, El Emporda y La Selva. Se han realizado análisis químicos de los materiales de los afloramientos principales, así como un estudio mineralógico mediante difractometria de rayos X y estudio de láminas delgadas al microscopio óptico. Se ha visto que son lavas relativamente homogéneas pertenecientes al grupo de los basaltos y basanitas. El empleo de la microscopía de calefacción permitió conocer la variación de la viscosidad de estos materiales con el aumento de la temperatura, viendo que funden a temperaturas relativamente bajas.Peer ReviewedPostprint (published version