Person: Mas Mayoral, José Ramón
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First Name
José Ramón
Last Name
Mas Mayoral
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Area
Estratigrafía
Identifiers
19 results
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Now showing 1 - 10 of 19
Item Depositional depth of laminated carbonate deposits: Insights from the lower Cretaceous Valdeprado formation (Cameros Basin, Northern Spain)(Journal of sedimentary research, 2013) Quijada, Isabel Emma; Suárez González, Pablo; Benito Moreno, María Isabel; Mas Mayoral, José RamónThe Lower Cretaceous (Berriasian) Valdeprado Formation (Cameros Basin, northern Spain) contains more than 900 m of laminated carbonates and pseudomorphs after sulfates. Traditionally, many sedimentary packages of different ages and lithologies have been interpreted as deep-water deposits based essentially on the abundance of laminations and the absence of subaerial exposure features. In contrast, the Valdeprado Formation provides an example of a shallow-water deposit dominated by laminations with scarce evidence of subaerial exposure, and gives criteria to solve the challenge of distinguishing shallow-water and deep-water, ancient laminated deposits. The two most abundant facies all along the Valdeprado Formation are: a) parallel-laminated limestone, formed by alternating carbonate mudstone and calcite and quartz pseudomorphs after displacive gypsum, and b) graded-laminated limestone, consisting of quartz, mica, ostracodes, and pseudomorphs after detrital gypsum grains at the base, which changes gradually upwards to carbonate mudstone. Parallel-laminated limestone and graded-laminated limestone could have been deposited in either deep or shallow environments as a result of salinity fluctuations driven by alternation of flooding and evaporation and by sediment resuspension processes, respectively. Subaerial exposure features, such as desiccation mudcracks, are scarce in most of the succession, except in a few meter-scale stratigraphic intervals where they are very abundant. Interestingly, in these intervals desiccation cracks are present at the tops of several successive laminae (up to 25 mudcracked laminae per meter of deposit), indicating that, at least during those periods of time, deposition occurred in shallow water bodies that were desiccated frequently. In the upper part of the stratigraphic section, parallel-laminated and graded-laminated limestones are associated with current-ripple and wave-ripple cross-laminated arenites, and ostracode mudstone to wackestone with centimeter-size pseudomorphs after lenticular gypsum, and abundant desiccation mudcracks and tepees, which also suggest sedimentation in shallow-water environments. Moreover, the laminated carbonates display continuous, parallel layering, and the same facies along the 40-km-long outcropping area. These deposits are directly interbedded with, and pass laterally to, siliciclastic sandy–muddy flat deposits in the western area of the basin, without clinoforms, slump structures, or slide masses in between. All of these features suggest deposition in shallow, perennial carbonate–sulfate water bodies and their peripheral mudflats, developed in a flat-bottomed basin with no marked gradients.Item Calcareous algae (dasycladales and charophytes), essential for the sedimentological interpretation of ancient coastal-lakes systems. The Barremian-Aptian Leza Fm., Cameros Basin, N Spain(Third circular. Program : 29th IAS Meeting of Sedimentology. Sedimentology in the Heart of the Alps. Schlaming, September, 10-13 2012, 2012) Suárez González, Pablo; Martín Closas, C.; Quijada, Isabel Emma; Benito Moreno, María Isabel; Mas Mayoral, José RamónItem Evolution of an intra-plate rift basin: the Latest Jurassic-Early Cretaceous Cameros Basin (Northwest Iberian Ranges, North Spain)(Geo-guías, Post-Meeting Field trips 28th IAS Meeting, Zaragoza, 2011) Mas Mayoral, José Ramón; Benito Moreno, María Isabel; Arribas Mocoroa, José; Alonso Millán, Ángela; Arribas Mocoroa, María Eugenia; Lohmann, K.C.; González Acebrón, Laura; Hernán, J.; Quijada, Isabel Emma; Suárez González, Pablo; Omodeo Salé, S.; Arenas, Concha; Pomar, Luis; Colombo, FerránItem Do stromatolites Need Tides to trap Oodis? insights from the Coastal-Lake carbonates of the Leza FM (Early Cretaceous, N Spain)(Abstract book / Tidalites 2012: 8th International Conference on tidal environments, Caen, France, july 31- august 2, 2012) Suárez González, Pablo; Quijada, Isabel Emma; Benito Moreno, María Isabel; Mas Mayoral, José RamónItem Can stromatolite lamination be explained by present-day marine examples? An answer from the Cretaceous Leza Fm (Cameros Basin, Spain)(Abstracts / 28th IAS Meeting of Sedimentology, Zaragoza, Julio 5-8, 2011) Suárez González, Pablo; Quijada, Isabel Emma; Benito Moreno, María Isabel; Mas Mayoral, José Ramón; Riding, R.; Bádenas, Beatriz; Aurell, Marcos; Alonso-Zarza, Ana MaríaItem Los isótopos de S en los yesos del Grupo Oncala: evidencia de influencia marina en los depósitos carbonático-evaporíticos berriasienses de la cuenca de Cameros (La Rioja-Soria)(Geotemas, 2016) Quijada, Isabel Emma; Suárez González, Pablo; Benito Moreno, María Isabel; Mas Mayoral, José RamónDiscriminar si el origen de las salmueras en las que precipitaron numerosas sucesiones evaporíticas era marino o continental puede resultar complicado usando exclusivamente criterios sedimentológicos si no contienen fósiles diagnósticos. Éste es el caso de los depósitos carbonático-evaporíticos laminados del Gr. Oncala (Berriasiense, cuenca de Cameros oriental), formados en extensos cuerpos de agua someros. En este trabajo se busca determinar el origen de la salmuera en la que se formaron estos sedimentos mediante el análisis de las composiciones del δ34S de los yesos preservados en la unidad. Los valores de δ34S de entre +18,5‰V-CDT y +21,8‰V-CDT (media de +20,5‰V-CDT) de los yesos del Gr. Oncala coinciden con la signatura isotópica de los sulfatos precipitados a partir de agua marina de edad berriasiense de acuerdo con las curvas globales más recientes (≈ +17 - +20‰V-CDT), lo que sugiere que la principal fuente de sulfato en estos cuerpos de agua procedía de aportes de agua marina, en lugar del reciclaje de evaporitas triásicas como se había propuesto anteriormente. El reconocimiento de influencia marina en estos cuerpos de agua permite clasificarlos como salinas costeras.Item Un ejemplo de llanura fluvio-deltaica influenciada por las mareas: el yacimiento de icnitas de Serrantes (Grupo Oncala, Berriasiense, Cuenca de Cameros, N. de España)(Geogaceta, 2010) Quijada, Isabel Emma; Suárez González, Pablo; Benito Moreno, María Isabel; Mas Mayoral, José Ramón; Alonso Millán, ÁngelaThe Late Jurassic-Early Cretaceous Cameros Basin comprises an expanded Tithonian to Early Albian stratigraphic record, mainly made up of fluvial and lacustrine systems, but also containing minor marine incursions. This basin is renowned because of preserving numerous ichnites sites, being the Berriasian Oncala Group one of the units that includes more of them. A sedimentological study of the deposits at the Serrantes site demonstrates that the ichnites are clearly associated with tidally-influenced fluvial-deltaic meandering channel and overbank deposits. The facies appearing in this outcrop are: 1) channelized beds, 2) lutites, 3) tabular sandstone beds, 4) black limestones, 5) laminated limestones with gypsum pseudomorphs. The ichnites are clearly associated to the siliciclastic deposits, especially to the lutitic facies, and are absent in the carbonate-evaporitic deposits.Item Eustatic versus tectonic control in an intraplate rift basin (Leza Fm, Cameros Basin). Chronostratigraphic and paleogeographic implications for the Aptian of Iberia(Journal of iberian geology, 2013) Suárez González, Pablo; Quijada, Isabel Emma; Benito Moreno, María Isabel; Mas Mayoral, José RamónThe Leza Formation is a carbonate unit of the northern Cameros Basin (N Spain) with controversial age, stratigraphic position, and sedimentological interpretation. It was deposited in a series of fault-bounded tectonic depressions along the northern margin of the basin. The Leza Fm overlies and changes laterally to the siliciclastic Jubera Fm, and the thickness of both units is also controlled by faults. Although the Leza Fm has been traditionally interpreted as lacustrine with sporadic marine incursions, detailed sedimentological analysis reveals new and very abundant evidences of marine influence: sedimentary structures of tidal origin, common marine fossils (dasycladales and foraminifers), and homogeneous populations of porocharacean charophytes, indicative of brackish conditions. Thus, this unit is interpreted as deposited in a system of coastal-wetlands with both fresh-water and sea-water influence, laterally related with the alluvial deposits of the Jubera Fm and the fluvio-lacustrine deposits of the Enciso Gr towards the centre of the basin. Using the chronostratigraphic ranges of the marine fossils and the lateral relationship with adjacent units, the Leza Fm is confirmed as part of a depositional sequence late Barremian - early Aptian in age. Furthermore, a transgressive trend is defined in the Leza Fm, which is compared with the eustatic evolution of the neighbouring Basque-Cantabrian, Iberian and Pyrenean marine basins, allowing correlation of the upper part of this unit with the widespread eustatic maximum of the middle-upper part of the early Aptian. This eustatic influence provided additional accommodation space to that created by tectonics. These data from the Cameros Basin are contrasted with a thorough compilation of paleogeographic data, showing that, during the early Aptian transgression, marine influence was likely to reach the northern Cameros Basin, not only coming from the SE Iberian Basin, as previously interpreted, but also from the NW Basque-Cantabrian Basin. This resulted in a probable link between Boreal and Tethyan marine realms [RESUMEN] La Formación Leza es una unidad carbonática del norte de la Cuenca de Cameros (N España), cuya edad, posición estratigráfica e interpretación sedimentológica son controvertidas. Se depositó en una serie de cubetas tectónicas limitadas por fallas a lo largo del borde norte de la cuenca. La Fm Leza yace sobre y pasa lateralmente a los depósitos siliciclásticos de la Fm Jubera, estando el espesor de ambas unidades también controlado por fallas. Pese a que la Fm Leza ha sido tradicionalmente interpretada como lacustre con incursiones marinas esporádicas, el análisis sedimentológico detallado revela nuevas evidencias muy abundantes de influencia marina: estructuras sedimentarias de origen mareal, y habituales fósiles marinos (dasycladales y foraminíferos), así como poblaciones homogéneas de carofitas porocaráceas, que indican medios salobres. Esta unidad se interpreta como formada en un sistema de humedales costeros con influencia tanto de agua dulce como de agua marina, relacionado lateralmente con los depósitos aluviales de la Fm Jubera y con los depósitos fluvio-lacustres del Gr Enciso hacia el centro de la cuenca. Usando los rangos cronoestratigráficos de los fósiles marinos y las relaciones laterales con unidades adyacentes, se confirma la pertenencia de la Fm Leza a la secuencia deposicional de edad Barremiense superior - Aptiense inferior. Además, se define una tendencia transgresiva en la Fm Leza, que al ser comparada con la evolución eustática de las cuencas marinas coetáneas, Vasco-Cantábrica, Ibérica y Pirenaica, permite la correlación de la parte superior de esta unidad con el máximo eustático generalizado de la parte media-superior del Aptiense inferior. Esta influencia eustática produjo un espacio de acomodación adicional al producido por la tectónica. Estos datos de la Cuenca de Cameros son contrastados con una recopilación exhaustiva de datos paleogeográficos, mostrando que durante la transgresión del Aptiense inferior, la influencia marina probablemente alcanzó el norte de la Cuenca de Cameros no sólo desde la Cuenca Ibérica al SE, como ha sido interpretado previamente, sino también desde la Cuenca Vasco-Cantábrica al NO. Esto produciría la probable unión entre los ámbitos del Océano Boreal y del Tetis.Item A coastal paradise for Aptian microbialites (Early Cretaceous, N Spain(11th Workshop on Alpine Geological Studies & 7th IFAAn, September, 7-14, 2013) Suárez González, Pablo; Quijada, Isabel Emma; Benito Moreno, María Isabel; Mas Mayoral, José Ramón; Riding, R.Item ‘Trapping and binding’: A review of the factors controlling the development of fossil agglutinated microbialites and their distribution in space and time(Earth-Science Reviews, 2019) Suárez González, Pablo; Benito Moreno, María Isabel; Quijada, Isabel Emma; Mas Mayoral, José Ramón; Campos Soto, SoniaTrapping and binding of allochthonous grains by benthic microbial communities has been considered a fundamental process of microbialite accretion since its discovery in popular shallow-marine modern examples (Bahamas and Shark Bay). However, agglutinated textures are rare in fossil microbialites and, thus, the role of trapping and binding has been debated in the last four decades. Recently, renewed attention on this subject has produced new findings of fossil agglutinated microbialites (those mainly formed by ‘trapping and binding’ and analogous to modern examples), but they are still few and geologically recent (mainly post-Paleozoic) when compared to the 3.5 Gyr long record of microbialites. In order to better understand this discrepancy between modern and fossil examples, an extensive literature review is presented here, providing the first thorough database of agglutinated microbialites, which shows that all of them are formed in shallow-marine environments and most under tidal influence. In addition, a Lower Cretaceous example is described, including very diverse microbialites, each of them formed in a particular paleoenvironment. Some of these microbialites developed in grainy settings, but only those formed in marginal-marine tide-influenced environments accreted mainly by trapping and binding the surrounding grains, being analogous of modern agglutinated microbialites, and matching the environmental pattern observed in the literature database. The combination of the literature review with the case study allows to discuss the factors that control and enhance ‘trapping and binding’: a) occurrence of grains in the microbialite environment; b) frequent currents that mobilize the grains and supply them onto the microbialite surface; c) high concentration and diversity of electrolytes in the water to increase the adhesiveness of the extracellular polymeric substances (EPS) of the microbialite surface; and d) a CaCO3 saturation state not high enough to promote early and strong carbonate precipitation within EPS, which would eventually decrease its availability to adhere grains. Therefore, this review shows that the keys to solve the ‘trapping and binding’ debate may be environmental, because the conjuction of these hydrodynamic and hydrochemical parameters is preferentially achieved in shallow-marine settings and especially in those influenced by tides, at least since Mesozoic times. This explains the limited environmental and stratigraphic distribution of microbialites mainly formed by ‘trapping and binding’, and opens new ways to look, geologically and microbiologically, at this process, so often cited and yet so rare.