Person:
Rodríguez López, Juan Pedro

Profile Picture
First Name
Juan Pedro
Last Name
Rodríguez López
URI
https://hdl.handle.net/20.500.14352/83883
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Area
Estratigrafía
Identifiers
UCM identifierORCIDScopus Author IDDialnet IDGoogle Scholar ID

Filters

2005 - 200922010 - 20161
Reset filters

Settings

Start date: 2004 × Subject: 551.7 ×

Search Results

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Una nueva interpretación de las Fms Escucha y Utrillas en su área tipo: sedimentología y evolución de un sistema desértico arenoso (erg) en el margen oriental de Iberia
    (Geotemas, 2008) Rodríguez López, Juan Pedro; Meléndez Hevia, María Nieves; Soria, Ana R.; Boer, P.L. de
    Nuevos datos obtenidos en el periodo 2004-2008, indican que las areniscas y arcillas de parte de la “clásica Fm. Escucha” y de la “clásica Fm. Utrillas” constituyen un sistema desértico arenoso (erg) en el que se desarrollaron dunas eólicas crescénticas, interdunas, dunas complejas, draas lineares, sabkhat detríticas, playa lakes y lags de deflación con ventifactos, bajo condiciones climáticas áridas. Este erg presenta un límite proximal (orla de wadis) con el Macizo Ibérico y un límite distal con el Tethys (marine erg-margin system). El cambio climático acaecido en Iberia en el tránsito Aptiense-Albiense, hacia condiciones climáticas áridas, favoreció el desarrollo del sistema desértico arenoso. El descubrimiento del primer sistema desértico cretácico de Europa abre nuevas vías para la comprensión de los procesos paleoclimáticos y paleoceanográficos acaecidos durante el Cretácico Medio.
  • Thumbnail Image
    Item
    Arquitectura estratigráfica de la Fm. Escucha (Albiense) en el flanco sur del Sinclinal de Cueva Foradada. Subcuenca de Oliete (Teruel), Cuenca Ibérica Central
    (Geotemas, 2005) Rodríguez López, Juan Pedro; Meléndez Hevia, María Nieves; Soria, Ana Rosa
    Detailed stratigraphic sections have allowed to establish the stratigraphic architecture of the Escucha Formation in the southern limb of the asymmetrical Cueva Foradada Syncline (Oiete Subbasin, Iberian Basin, Spain). The stratigraphic correlation builded from the studied stratigraphic sections shows the spatial distribution of the main architectural elements and their spatial relationships. Offshore, intertidal, supratidal, flood delta / tidal inlet and bay-lagoon with tidal meandering channel facies associations occurred in a strongly tidal-influenced stratigraphic succession. The occurrence of several key stratigraphic levels characterized by the presence of nodular-iron rich levels with gastropods, levels of oyster accumulations and galuconitic sandstones suggest that the beginning of the Escucha Formation's evolution was characterized by the development of several transgressive periods that interrupted the development of coal-forming and tidal-influenced siliciclastic sedimentary subenvironments.
  • Thumbnail Image
    Item
    Glacial dropstones in the western Tethys during the late Aptian–early Albian cold snap: Palaeoclimate and palaeogeographic implications for the mid-Cretaceous
    (Palaeogeography, Palaeoclimatology, Palaeoecology, 2016) Rodríguez López, Juan Pedro; Liesa, Carlos L.; Pardo, Gonzalo; Meléndez Hevia, María Nieves; Soria, Ana R.; Skilling, Ian
    The late Jurassic–early Cretaceous is commonly considered the only cold climatic interval in Earth history without any direct evidence of polar ice. A newly discovered dropstone-bearing interval from the subtropical Iberian Basin (western Tethys) is described and provides evidence of contemporaneous polar glaciation. This interval is correlated laterally for 4.8 km and contains a boulder and two cobble-sized quartzite dropstones that are encased in mid-Cretaceous fissile black shales and fine-grained sandstones. Based on previously published dimensions of similar large clasts, only glacial dropstones and impact ejecta blocks reach the dimensions of the boulder-sized dropstone reported from Iberia. The dropstones show morphological features compatible with glacial transport and abrasion in a subglacial setting which closely resembles the features observed in recent glacial boulders exposed near the snouts of glaciers in Iceland. These Late Aptian dropstones from Spain correlate with many other similar erratics in the northern and southern palaeohemispheres, and suggest that ice sheets formed around the palaeo-North Pole during certain periods of the early Cretaceous. Our results and associated evidence such as the occurrence of glendonites, tillites, moderate- to high-amplitude sea-level oscillations worldwide, minimum pCO2 concentrations, variation in calcareous nannofossil assemblages from low and high latitudes and isotopic excursions suggest that during the mid-Cretaceous there were periods of ice growth and decay that influenced the palaeotemperature, palaeoecology and sedimentology of the marine realm. The new data from Iberia are supported by recent results from Arctic Canada that indicate cool shelves and a mid-Cretaceous cold snap that developed for ~6 Myr between 118 and 112 Ma. The late Aptian dropstones reported in eastern Iberia were likely transported from high northern latitudes towards subtropical ones in the western Tethys by an extreme iceberg drift similar to those occurring at the present day in the Atlantic Ocean. Icebergs released from a northern fringing ice sheet may have travelled southwards through the Greenland–Norwegian Seaway.