Person:
Arribas Mocoroa, José

First Name

José

Last Name

Arribas Mocoroa

Affiliation

Universidad Complutense de Madrid

Faculty / Institute

Ciencias Geológicas

Department

Mineralogía y Petrología

Area

Petrología y Geoquímica

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Now showing 1 - 10 of 97

Composition of modern stream sand derived from a mixture of sedimentary and metamorphic source rocks (Henares River, Central Spain)
(Elsevier, 2000) Arribas Mocoroa, José; Critelli, Salvatore; Le Pera, Emilia
The Henares River, central Spain, flows westward from the Iberian Range (Mesozoic sedimentary rocks) under semiarid climatic conditions. In the middle and lower reaches, the Henares River receives sediment from three tributaries (Cañamares, Bornova and Sorbe rivers) that drain the Central System (Paleozoic crystalline rocks, low-grade metamorphic rocks, and minor amounts of Mesozoic sedimentary rocks). Modern sands from the Henares River and its tributaries offer an excellent opportunity to evaluate the importance of lithology and physiography in determining detrital modes from mixed metamorphic and sedimentary source terrain. Sand modes from the Henares River and its tributaries are quartzolithic. They plot in a restricted area on a QmFLt diagram, with low contents of feldspar and variable amounts of quartz, and carbonate, metamorphic and minor siliciclastic lithic fragments. Higher feldspar abundances in the Cañamares and Bornova stream sands are related to the erosion of gneissic rocks. By contrast, sands from Sorbe River are low in feldspar, reflecting the absence of coarse metamorphic sources. Thus, proportions of bedrock lithologies in the drainage sub-basins are the main control on detrital modes of the tributaries. In addition, slope acts on the sand productivity of source rocks. Sedimentary source rocks in the upper reaches of the three tributaries have a poor productivity in the carbonate lithic fragments (Lsc), compared with the Lsc productivity of sedimentary sources located downstream, with higher relief. The percentage of bedrock types in the source area versus petrographic indices (Lm/L, Lss/L and Lsc/L) provide a useful contrast between source and sand composition in the tributaries. Thus, the high content of metamorphic lithic grains in the lithic grain population over-represents this lithology (slate plus schist) at the source terrain. Lithic grains from sedimentary clastic sources generate few recognizable grains (Lss) in the lithic grain population. Local supplies from carbonate sources may produce important increases of Lsc in short reaches of the channels. Sand compositions in the Henares River seem to be very homogeneous in a QmFLt diagram, with only minor differences caused by the supplies from the tributaries. These differences can be modeled in terms of end-member mixing processes between Henares detritus and detritus from the relevant tributary. These mixing processes are more evident when lithic grain contents (LmLvLs and LmLssLsc diagrams) are compared. Changes produced by inputs from the Cañamares, Bornova and Sorbe rivers are not permanent along the Henares course. An important homogenization of Henares sand composition takes place by the mixing of tributary deposits with previously deposited Henares River terraces. Abrasion during transport does not appear to cause significant changes in the sand composition along the Henares River.
Interpretación estratigráfica y estructural de la Cuenca de San Pedro (margen sudeste de la República Dominicana)
(Sociedad Geológica de España., 2021) Gorosabel Araus, J.M.; Granja Bruña, José Luis; Gallego Mingo, , A.; Carbó Gorosabel, Andrés; Mas Mayoral, José Ramón; Arribas Mocoroa, José; Arribas Mocoroa, María Eugenia; López Andrés, Sol; Canales Fernández, María Luisa; Rodríguez Zurrunero, Álvaro; Reynoso-Villafaña, R.; Rosario, G.; Muñoz-Tapia, S.J.
La cuenca de San Pedro (CSP) se define como una depresión batimétrica con tendencia E-O y una extensión aproximada de 6000 km2, situada en el margen sureste de la isla de La Española (República Dominicana y Haití). Estructuralmente se ubica en la parte trasera del Cinturón Deformado de los Muertos (CDM). Considerada tradicionalmente como una cuenca de edad Mioceno medio, cuyo relleno ha sido depositado en el espacio de configuración generado por la progresiva deformación del CDM. Sin embargo, gracias a la integración de los trabajos de cartografía geológica (Proyectos SYSMIN I y II) con datos de geofísica de subsuelo (sísmica de reflexión, registros de pozo y campos potenciales), ha sido posible proponer un nuevo modelo evolutivo de la cuenca que abarca desde el inicio de la sedimentación en un contexto de retro-arco desde el Cretácico Superior hasta la inversión de la cuenca en el Eoceno medio y la posterior evolución del conjunto CSP-CDM hasta la actualidad, pudiendo correlacionar las principales secuencias estratigráficas y estructuras con los datos de afloramiento y pozo.
Evolution of an intra-plate rift basin: the Latest Jurassic-Early Cretaceous Cameros Basin (Northwest Iberian Ranges, North Spain)
(Sociedad Geológica de España, 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, Ferrán
Tipologías de cuarzo como indicadores de la procedencia en areniscas: excepciones al método de Basu et al. (1975)
(Consejo Superior de Investigaciones Científicas, Museo Nacional de Ciencias Naturales, 1988) Tortosa, A.; Palomares Herranz, Marta; Arribas Mocoroa, José
En el presente trabajo se analiza el contenido de las distintas tipologías de cuarzo, definidas por Basu et al. (1975) para análisis de procedencia, en depósitos arenosos actuales, generados a partir de macizos del Sistema Central con distintas litologías (granitos, gneises, pizarras-esquistos). Aplicando la metodología de dichos autores se observa que, para los depósitos estudiados, pierde validez para discriminar áreas de procedencia plutónica y metamórfica de alto grado en función del contenido en las tipologías monocristalinas. No obstante, se corrobora la utilidad del contenido en las tipologías policristalinas para diferenciar áreas metamórficas de bajo grado. [ABSTRACT] In this study we have analized the content of the different detrital quartz types (Basu et al., 1975) in recent sands derived fram single source areas (granitic, gneissic and slate-schists lithologies) in the Sistema Central. Fallawing the methadalagy af Basu el al. (1975), far sand provenance interpretation, we have observed that, in these deposits, the cantent of monocrystaline quartz types is not useful to discriminate plutonic and high rank metamorphic sources. However, we can canfirm the validity of the policrystaline types content to distingllish sands of low rank metamorphic parentage
Sedimentología y diagénesis de la barra carbonatada inferior del Muschelkalk en la rama aragonesa de la Cordillera Ibérica. ( PROVINCIA DE ZARAGOZA )
(Obrador, A., 1983) Arribas Mocoroa, José; Peña, José Andrés de la; Obrador, A.
Diagenesis, provenance and reservoir quality of Triassic TAGI sandstones from Ourhoud field, Berkine (Ghadames) Basin, Algeria
(Elsevier Science Ltd, 2002) Rossi, Carlos; Kälin, Otto; Arribas Mocoroa, José; Tortosa, A.
The Triassic TAGI (Trias Argilo-Gréseux Inférieur) fluvial sandstones are the main oil reservoirs in the Berkine Basin, Algeria. Nonetheless, their provenance and diagenesis, and their impact on reservoir quality, are virtually unknown. Samples from the Ourhoud field, representing the Lower, Middle and Upper TAGI subunits, were studied using a combination of petrographic, mineralogical and geochemical techniques. The Lower TAGI sandstones have an average framework composition of Q98.3F0.6R1.1 and 95% of the quartz grains are monocrystalline. By contrast, the Middle–Upper TAGI sandstones have an average framework composition of Q88.3F9.8R1.9 and 79.7% of the quartz grains are monocrystalline. The Lower TAGI quartz arenites derived from Paleozoic siliciclastic rocks, whereas the Middle–Upper TAGI subarkoses originated mainly from metamorphic terrains. This change in provenance is a potential criterion for correlation within the TAGI. Also, this change has contributed to the significantly different diagenetic paths followed by the Lower TAGI quartz arenites and the Middle–Upper TAGI subarkoses. Grain-coating illitic clays are abundant in the Lower TAGI, where they exert a critical control on reservoir quality. These clays are interpreted as pedogenic and/or infiltrated in origin and to have had, in part, smectitic precursors. Shallow burial Fe-dolomite cementation was favored in the downthrown block of the field-bounding fault, where it contributed to the poor reservoir quality. Magnesite–siderite cements are multiphase. The earliest generation is composed of Fe-rich magnesite that precipitated during shallow burial from hypersaline fluids with high Mg/Ca ratios, probably refluxed residual brines associated with the Liassic evaporites. Later magnesite–siderite generations precipitated during deeper burial from waters with progressively higher Fe/Mg ratios. Authigenic vermicular kaolin largely consists of dickite that replaced previously formed kaolinite. Dickitization was followed by late-stage illitization related to the dissolution of detrital and authigenic K-feldspar. Quartz, the most abundant cement, was mainly sourced by the pressure- or clay-induced dissolution of detrital quartz and is a critical factor controlling the reservoir quality. Overall, quartz cement is more abundant in the Lower TAGI than in the Middle–Upper TAGI, and this increase correlates with a decrease in average porosity. Within the Lower TAGI, quartz cement abundance is stratigraphically very variable, which is in part related to facies controlled variations in grain-coating clay, resulting in major vertical variations in reservoir quality. Anhydrite and barite cements postdate quartz overgrowth. The sulfate necessary for their formation was likely sourced by deep subsurface dissolution of Late Triassic–Liassic evaporites.
Estudio de la fracción pesada de arenas actuales derivadas del Sistema Central y su aplicación a los estudios de procedencia.
(Instituto Geológico y Minero de España, 1989) Palomares Herranz, Marta; Tortosa, A.; Arribas Mocoroa, José
En el presente trabajo se caracteriza la fracción pesada de las arenas actuales generadas en el Sistema Central a partir de áreas fuentes con litología única: plutónica, gneísica o pizarroso-esquistosa. Se analiza la proporción de fracción pesada en relación al total de la muestra en función de la litología de partida y del tamaño de grano, observándose cómo dicha fracción es más abundante en las arenas derivadas de pizarras y esquistos. Asimismo la proporción de fracción pesada aumenta con la disminución del tamaño de grano en todos los casos. Se describe una asociación de minerales pesados transparentes para la fracción de tamaño más fina, 0,125-0,062 mm., en arenas de origen plutónico (turmalina, apatito, andalucita, hornblenda, circón, epidota y monacita), otra en arenas de origen gneísico (sillimanita, apatito, andalucita, turmalina, granate, circón y monacita) y otra en arenas de origen pizarroso-esquistoso (sillimanita, apatito, circón, epidota, distena, rutilo y esfena). Se pone en duda la utilidad de dichas asociaciones como medio de deducir la litología del área de procedencia de los depósitos arenosos fósiles; en primer lugar por su alta dependencia con el tamaño de grano de la arena, y en segundo lugar por la semejanza de las mismas entre unas litologías de partida y otras. [ABSTRACT] In this work we have analized the heavy mineral fraction of modern sands derived from Single source lithology (plutonic gneis sic or slate-schists) in the Central System (Spain). The amount of heavy mineral fraction is very high in slate-sehists derived sand, and in all samples heavy mineral fraction increases when grain-size reduces. Transparent heavy mineral associations are described on finest grain-size fraetion (0,125-0,062 mm.) to sands with plutonic provenance (tourmaline, apatite, andalueite, hornblende, zircon, epidote and monacite); one other to sands with gneissic provenance (sillimanite, apatite, andalucite, tourmaline, granet, zircon and monacite); and one other to sands with slateschists provenance (sillimanite, apatite, zircon, epi dote, distene, rutile and sphene). We put in doubt the usefulness of heavy mineral associations as a tool to provenance analysis in aneient sand deposits; first by the high dependence of the associations with grain-size sand, and second by the similitude of associations in sand of different parent rocks.
The “Raña” unit, an intensely weathered Late Neogene product from SW Iberia: Petrographic and geochemical evidences
(Elsevier B.V., 2021-10) Arribas Mocoroa, José; Garzón Heydt, Guillermina; Tejero López, Rosa; Tsige Beyene, Meaza
The Raña is a morphosedimentary unit related to the last record of the Guadiana Basin and located in the southwestern Iberian Peninsula. The Guadiana Basin is an intracratonic basin filled with <200 m of Paleogene and Neogene clastic sediments. The Raña unit represents a relict unit that lies over the northern border of the Guadiana Basin and the Variscan basement of Neoproterozoic and Palaeozoic low-grade metasediments from the Iberian Massif. Raña deposits are alluvial fans abandoned by their feeding streams during the Late Neogene period. Outcrops correspond to the apex of the alluvial fans isolated from the fluvial network. This study analysed Raña deposits using petrographic, mineralogical, and geochemical techniques, which suggested a source-to-sink analysis by contrasting data among the three involved elements: source areas, basin fill sediments, and Raña deposits. Sandstones from the basin infill show primarily quartzolithic petrofacies as a consequence of the low-grade metamorphic character of the sources. The Raña sandstones show similar petrofacies with a greater quartz content than basin infill deposits and an important population of argillaceous pisoids. Kaolinite is the dominant clay mineral associated with the Raña units. The aforementioned characteristics indicate a sedimentary provenance from intensely weathered products. The contrast of the geochemical composition of the parent rocks, basin-fill, and Raña deposits also confirms the forced maturation of sediments by chemical weathering. Chemical index of alteration values show evolution from infill sediments (76) to Raña deposits (90) as a consequence of mobile cation loss (Ca, Na, and K). This approach is related to different zones of alteration in soils, suggesting the formation of sapropelic deposits on weathering mantles at the source under hot and wet climates (tropical) during the formation of the Raña deposits. Finally, the provenance signals prevail despite intense weathering.
Petroleum systems modelling in a fold-and-thrust belt setting: the inverted Cameros basin, north-central Spain
(Wiley, 2019-04) Omodeo Salé, S.; Ondrak, R.; Arribas Mocoroa, José; Mas Mayoral, José Ramón; Guimerà, J.; Martínez, L.
The Mesozoic Cameros Basin, northern Spain, was inverted during the Cenozoic Alpine orogeny when the Tithonian – Upper Cretaceous sedimentary fill was uplifted and partially eroded. Tar sandstones outcropping in the southern part of the basin and pyrobitumen particles trapped in potential source rocks suggest that hydrocarbons have been generated in the basin and subsequently migrated. However, no economic accumulations of oil or gas have yet been found. This study reconstructs the evolution of possible petroleum systems in the basin from initial extension through to the inversion phase, and is based on structural, stratigraphic and sedimentological data integrated with petrographic and geochemical observations. Petroleum systems modelling was used to investigate the timing of source rock maturation and hydrocarbon generation, and to reconstruct possible hydrocarbon migration pathways and accumulations. In the northern part of the basin, modelling results indicate that the generation of hydrocarbons began in the Early Berriasian and reached a peak in the Late Barremian – Early Albian. The absence of traps during peak generation prevented the formation of significant hydrocarbon accumulations. Some accumulations formed after the deposition of post‐extensional units (Late Cretaceous in age) which acted as seals. However, during subsequent inversion, these reservoir units were uplifted and eroded. In the southern sector of the basin, hydrocarbon generation did not begin until the Late Cretaceous due to the lower rates of subsidence and burial, and migration and accumulation may have taken place until the initial phases of inversion. Sandstones impregnated with bitumen (tar sandstones) observed at the present day in the crests of surface anticlines in the south of the basin are interpreted to represent the relics of these palaeo‐accumulations. Despite a number of uncertainties which are inherent to modelling the petroleum systems evolution of an inverted and overmature basin, this study demonstrates the importance of integrating multidisciplinary and multi‐scale data to the resource assessment of a complex fold‐and‐thrust belt.
Caracterización composicional de los depósitos arenosos actuales generados en el Sistema Central.
(Consejo Superior de Investigaciones Científicas, Museo Nacional de Ciencias Naturales, 1989) Tortosa, A.; Palomares Herranz, Marta; Arribas Mocoroa, José
Se caracteriza composicionalmente la fracción ligera arenosa de los depósitos detríticos actuales generados en zonas de cabecera de arroyos que drenan macizos del Sistema Central con distintas litologías (plutónicas, gnéisicas o pizarras-esquistos). Dicha caracterización se ha basado en el análisis petrográfico de las muestras recogidas. Este análisis se ha efectuado, en cada muestra, en cinco fracciones de tamaño con intervalos de l 0 entre 2 mm y 0,062 mm. De este modo se estudia el control que ejercen tanto la litología del área fuente como el tamaño de grano en la composición modal de los depósitos. Con la disminución del tamaño de grano se produce una disminución del contenido en fragmentos de roca. Por el contrario, el porcentaje de feldespatos aumenta en las fracciones de tamaño más fino debido a su inestabilidad mecánica. Dicha inestabilidad nos hace dudar, por otro lado, de la utilidad del índice K/P (relación entre feldespato potásico y plagioclasa) en análisis de procedencia de areniscas ya que hace variar considerablemente su valor de unas fracciones a otras. El contenido en granos de cuarzo es independiente del tamaño de grano en arenas de procedencia plutónica, mientras que en los depósitos derivados de áreas metamórficas aumenta con la disminución del tamaño de grano. Las tendencias de variación de todos los componentes en función del tamaño de grano son similares en todos los depósitos, sin embargo, el contenido en cadá uno de ellos difiere mucho en función de la litología de partida. El lugar de proyección de los depósitos estudiados en un diagrama de composición QFFR (Pettijohn et al., 1973) está controlado por el tamaño de grano y por la litología del área de procedencia. Así, las arenas de origen pizarroso-esquistoso aparecen proyectadas en todas sus fracciones cerca del margen QFR. Por el contrario, el lugar de proyección de las arenas de procedencia plutónica y gnéisica varía con el tamaño de grano desde el polo FR hasta las proximidades del margen QF, por lo que consideramos que la proyección de una única fracción de tamaño específico (0,5-0,25 mm.), si bien permite la discriminación de litologías, hace que se pierda una importante información acerca de la composición global del depósito. [ABSTRACT] In this work we have studied the light mineral fraction of modern sands derived from single source lithologies (plutonic, gneissic or slate-schists) in the Sistema Central (Central Spain). In this way we can analize the control of the source area lithology in sand composition. First we pay attention on the control of grain size sand in composition. Rock fragments decrease when grain size decreases. However, the amount of feldspar increases due to its low mechanical stability. Thus, the K/P index (K-feldspar/plagioclases) is highly variable with grain size, because the different mechanical stabilities of both minerals. The trends of the amounts of components in relation with grain size are very similar, in all deposits. However, each percentages vary markedly between source areas with different lithologies. The projection area of the studied sands in a QFFR diagram is highly controled by grain size and lithology of source area. Thus, sands derived from slate-schists lithology appear near QFR fringe in all grain size fractions. Sands derived from plutonic or gneissic rocks have a high dispersion in the diagram, from FR pole to QF fringe, depending on grain size of the sand. We conclude that the use of a single sand size fraction (0,5-0,25 mm) to provenance analysis permits to discrimine source lithologies, but with a loss of information about global deposit composition.