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Fuenlabrada Pérez, José Manuel

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First Name
José Manuel
Last Name
Fuenlabrada Pérez
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
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Now showing 1 - 10 of 28
  • Publication
    Geochemistry and Sm–Nd isotopic sources of Late Ediacaran siliciclastic series in the Ossa–Morena Complex: Iberian–Bohemian correlations
    (Springer, 2021) Rojo-Pérez, Esther; Fuenlabrada Pérez, José Manuel; Linnemann, Ulf; Arenas Martín, Ricardo; Sánchez Martínez, Sonia; Díez Fernández, Rubén; Martín Parra, Luis Miguel; Matas, Jerónimo; Andonaegui Moreno, Pilar; Fernández Suárez, Javier
    The Cadomian basement in central and southern Europe is composed by Ediacaran–Early Cambrian sequences that appear dismembered along the Variscan Orogen. These ancient series contain geochemical and isotopic keys related to their deposition in different basins located along the paleo margin of Gondwana. The southwest of Iberian Massif (Ossa–Morena Complex) contains an excellent representation of Cadomian basement. The oldest sedimentary succession of this region, the Serie Negra Group (c. 600–541 Ma), is composed by the Montemolín Formation which consists of metapelites, metagreywackes and abundant amphibolites; and the Tentudía Formation which consists of metagreywackes, black quartzites and metapelites. The whole-rock and Nd isotopic geochemistry of the Montemolín and Tentudía formations, are consistent with a deposition in a back-arc or fore-arc setting. Their Nd isotopic composition shows highly negative εNd(t) values in a range between − 6.9 and − 11.5, resulting in old Paleoproterozoic Nd model ages between 1.9 and 1.7 Ga. The Nd isotopic signatures obtained for the Cadomian basement in the Iberian Massif are almost identical to those obtained for equivalent sedimentary series in the Saxo-Thuringian Zone (Bohemian Massif), where Nd model ages range between 2 and 1.6 Ga. The limited variability of these Nd-TDM ages suggests that the southwestern Iberian and North Bohemian series shared a common source during Ediacaran times, which would be located close to the periphery of the West African Craton. The Nd isotopic data considered herein provide solid evidence about the peri-Gondwanan location and correlation between the Cadomian basement of southwestern Iberia and North Bohemia.
  • Publication
    Paleogeografía geoquímica de las series metasedimentarias del Macizo Ibérico
    (Sociedad Geológica de España., 2016) Fuenlabrada Pérez, José Manuel; Arenas Martín, Ricardo; Sánchez Martínez, Sonia; Díez Fernández, Rubén; Pieren Pidal, Agustín Pedro
    Las características geoquímicas e isotópicas de las series turbidíticas del Macizo Ibérico reflejan distintos escenarios tectónicos en la periferia de Gondwana. Estos cambios se observan en el registro sedimentario de la transición Ediacarense-Cámbrico, que tuvo lugar en el contexto general de un margen continental activo. TDM jóvenes y ɛNd menos negativos resultan característicos de cuencas sedimentarias más exteriores, con una importante contribución de material juvenil derivado del sector más activo del arco volcánico (metagrauvacas culminantes de las Unidades Superiores del Complejo de Órdenes). Las cuencas sedimentarias más próximas al continente se caracterizan por mayores aportes desde dominios alejados del arco activo que dan lugar a valores de TDM más antiguos y ɛNd muy negativos (metagrauvacas de las Unidades Basales del Complejo de Malpica-Tui). Una evolución desde contextos activos hasta otros más propios de márgenes pasivos se detecta con claridad en la transición Ediacarense-Cámbrico, y debe relacionarse con una disminución de la actividad del arco volcánico y la transición hacia un margen pasivo. El diagrama de fSm/Nd vs ɛNd confirma esta variación de los escenarios tectónicos asociados al margen de Gondwana, perfectamente registrados en los metasedimentos de diferentes sectores y unidades del Macizo Ibérico.
  • Publication
    Geoquímica de series metasedimentarias del Macizo Ibérico: contexto dinámico de la transición Ediacarense- Cámbrico
    (Universidad Complutense de Madrid, 2018-09-27) Fuenlabrada Pérez, José Manuel; Arenas Martín, Ricardo; Sánchez Martínez, Sonia; Galindo Francisco, Carmen
    El Macizo Ibérico contiene una excelente representación de la estratigrafía del Paleozoico Inferior, así como de la transición con el Neoproterozoico Superior. La geoquímica de las series siliciclásticas (elementos mayores y trazas) y sus fuentes isotópicas (Sm-Nd) han sido muy poco investigadas hasta tiempos recientes, a pesar de que estos aspectos son importantes a la hora de conocer el contexto dinámico de las cuencas y su ubicación en el paleomargen de Gondwana. En esta tesis se presenta un estudio basado en estas metodologías y tiene como objetivo principal la investigación de las series estratigráficas que definen la transición entre el Cámbrico Inferior y el Ediacarense. Las series estudiadas corresponden a las Unidades Alóctonas Superiores y a las Unidades Alóctonas Basales del NW, al Cámbrico Inferior y Alcudiense del sector meridional de la Zona Centroibérica y a las Unidades Alóctonas Basales del SW. La labor realizada se ha sintetizado en varios trabajos ya publicados, que se han incluido en esta memoria y representan su contenido fundamental. La memoria se ha completado además con unos apartados introductorios de contenido metodológico y un capítulo final que presenta una síntesis de resultados a escala del Macizo Ibérico.Los resultados obtenidos indican como conclusión general, un cambio significativo en la influencia de un arco volcánico Cadomiense sobre los procesos sedimentarios que tenían lugar en el margen de Gondwana y por consiguiente, sobre la composición química de las secuencias sedimentarias siliciclásticas ediacarenses y cámbricas. Este cambio supuso una evolución progresiva del contexto deposicional, probablemente ligado a la apertura y ensanchamiento de una extensa cuenca back-arc. Esta apertura ocasionó durante el Paleozoico más inferior un progresivo alejamiento de las cuencas sedimentarias del foco principal de la actividad magmática, cuya actividad era también aparentemente decreciente, y una evolución muy lenta pero continua hacia un margen pasivo durante la mayor parte del Cámbrico. La transición es especialmente evidente en la geoquímica (elementos mayores y trazas) de las secuencias sedimentarias del Cámbrico Inferior y del Alcudiense (Ediacarense) del sector meridional de la Zona Centroibérica. También es patente en la composición de las secuencias detríticas de las Unidades Alóctonas Basales del NW de Iberia. La investigación de las fuentes isotópicas (Sm-Nd) refleja la misma evolución geodinámica de los terrenos peri-Gondwánicos entre el Ediacarense y el Cámbrico. Es particularmente visible en el caso de las secuencias metasedimentarias de la Zona Centroibérica, donde la evolución de los valores de Nd indican una menor influencia del arco volcánico durante la sedimentación de las series cámbricas. Las TDM más antiguas registradas en estas secuencias del Cámbrico Inferior (1444 - 1657 Ma), son compatibles con un incremento de los aportes desde áreas fuente gondwánicas antiguas y una disminución de los aportes juveniles procedentes del arco volcánico...
  • Publication
    Amorphous glass fragments from archaeological surface surveys: Potential chronological use of ion beam and isotopic analytical characterization
    (Elsevier, 2018-06) Zucchiatti, A.; Climent-Font, A.; Gutiérrez-Neira, P. C.; Montero-Ruiz, I.; Fuenlabrada Pérez, José Manuel; Galindo Francisco, Mª del Carmen
    Analytical techniques have been used to implement the archaeological information from surface surveys. We have shown that the compositional comparison of amorphous samples, e.g. glass, can provide important chronological information when compared with findings from other sites. A group of 61 glass fragments, recovered from an archaeological surface survey at the site of the Roman city of Duratón (1st to 3rd century AD), near Segovia, Spain, have been analysed by combined Particle Induced X-ray/Gamma-ray Emission (PIXE-PIGE) techniques and by isotope dilution mass spectrometry. Four groups of objects were identified. The largest group by far, corresponds to the typical sodium-rich natron-made Roman glass. Compared with data reported in previous studies, including a few on the Iberian Peninsula, the composition of Duratón natron glass is similar to that of the widespread Roman 1st–3rd century AD glasses. The glasses of the nearby Patones, six of which have been analysed in this study, belong, on the contrary, to the so-called HIMT glass. This is compatible with the soda-lime-silica glass pattern observed in the Western Mediterranean. HIMT glass is dominant in this area from the 4th century onward. HIMT glass products are much easier to make and less expensive. Strontium and neodimium isotope analysis confirms the compositional proximity of the Duratón glasses to three groups of 1st–3rd century samples from Barcino, Lyon and the Iulia Felix wreck and point to a production of the glass in the Eastern Mediterranean. Pliny the Elder in his Naturalis Historia had specifically mentioned the glass production of Hispania and Gallia, which should hopefully be confirmed by the findings in the corresponding regional sites. This is the case for Gallia but not yet for the Iberian Peninsula, where few Roman glass analyses have been completed.
  • Publication
    Whole-rock and Sm–Nd isotopic geochemistry of Triassic SW Iberia sandstones: implications for provenance
    (Universidad Complutense de Madrid, 2021) Gama, Cristina; Pereira, M. Francisco; Fuenlabrada Pérez, José Manuel; Arenas Martín, Ricardo
    Whole-rock and Sm–Nd isotopic geochemistry data were used to characterise the probable sources of the Triassic Alentejo and Algarve sandstones. These rocks were deposited in a rift setting, plot within the recycled field in the QFL and discrimination function diagrams for sandstones, thus supporting derivation from a recycled orogenic terrane. They all show negative Eu anomalies, enrichment of LREE, and nearly flat HREE patterns, typical of upper-continental crustal sources. Their Nd TDM model ages and detrital zircon populations are significantly coincident with those of the Late Devonian-Early Carboniferous Phyllite-Quartzite and Tercenas formations and Early Carboniferous Mira turbidites of the South Portuguese Zone (SPZ), indicating that these may have been their dominant sources, with a minor contribution from the Visean Mértola turbidites. In particular, the Mira turbidites may also be regarded as the dominant source of the eastern Algarve Triassic sandstones. Furthermore, the Nd TDM model ages and the detrital zircon populations of the central Algarve Triassic sandstones as compared with those of the SPZ Late Carboniferous Brejeira and Late Devonian Ronquillo formations suggest a strong source to sink relationship. Finally, some of the western Algarve Triassic sandstones show older Nd TDM model ages which have not been recognized in the SPZ basement rocks, and, hence, suggest that these sediments may derive directly from primary remote sources. We advance the suggestion that beyond remote potential sources from the Meguma Terrane, others from the Moroccan Variscan Belt have been reproduced in the Devonian-Carboniferous SPZ basement as the result of sediment recycling. These SPZ would represent intermediate sediment repositories and would be later on reworked and incorporated into the Triassic Algarve Basin, thus indicating multi-cycle sedimentation.
  • Publication
    Age and petrogenesis of the beryl-bearing granitic magmatism of the Velasco Pegmatite District, Pampeana Province, NW Argentina
    (Sociedade Brasileira de Geologia, 2021) Sardi, Fernando Guillermo; Marangone, Silvana; Fuenlabrada Pérez, José Manuel
    Two porphyritic granitoids (Huaco and Sanagasta) in the Velasco district of the Pampeana Pegmatite Province in Northwestern Argentina are recognized. They are considered the fertile granites of the beryl-bearing pegmatites and can be described as post-orogenic and peraluminous A-type granites formed in an intraplate tectonic setting during an extensive regime, whose magma source is predominantly of cortical origin and to a lesser extent, mantle-derived. The pegmatites are classified as Rare Elements of the beryl type and beryl-columbite-phosphate subtype, while the entire district shows characteristics related to the NYF (Nb-Y-F) petrogenetic family. From rocks and cogenetic minerals of an individual ‘Ismiango’ pegmatite of the Velasco district, two Rb/Sr isochrons have been constructed. They define an age of 330.3 ± 8.3 and 331.7 ± 2.3 Ma and fall in the Lower Carboniferous period, consistent with the age of the parental and host-rock, the Huaco granite. As the Ismiango pegmatite has a similar composition and structure to the other beryl mineralized pegmatites of the Velasco district, the obtained age is attributed extensively for the entire district. According to the initial 87Sr/86Sr value obtained of 0.713, the pegmatite-magmatism of the Velasco District might be mainly derived from the crust with some minor participation of mantle materials.
  • Publication
    Geochemistry of the Ediacaran–Early Cambrian transition in Central Iberia: Tectonic setting and isotopic sources
    (Elsevier, 2016-06) Fuenlabrada Pérez, José Manuel; Pieren Pidal, Agustín Pedro; Díez Fernández, Rubén; Sánchez Martínez, Sonia; Arenas Martín, Ricardo
    A complete Ediacaran–Early Cambrian stratigraphic transition can be observed in the southern part of the Central Iberian Zone (Iberian Massif). Two different stratigraphic units, underlying Ordovician series, display geochemical and Sm–Nd isotopic features in agreement with an evolving geodynamic setting. Pusa Shales (Early Cambrian) rest unconformably on greywackes of the Lower Alcudian Formation (Late Ediacaran). Both sequences present minor compositional variations for major and trace element contents and similar REE patterns, close to those of PAAS (Post Archean Australian Shale). Trace element contents and element ratios suggest mixed sources, with intermediate to felsic igneous contributions for both units. Tectonic setting discrimination diagrams for the Ediacaran greywackes indicate that these turbiditic series were deposited in a sedimentary basin associated with a mature active margin (volcanic arc). However, the compositions of the Cambrian shales fit better with a more stable context, a back-arc or retro-arc setting. εNd(T) and TDM ages are compatible with dominance of a similar cratonic source for both sequences, probably the West Africa Craton. εNd565 values for the Ediacaran greywackes (−3.0 to −1.4) along with TDM ages (1256–1334 Ma) imply a significant contribution of juvenile material, probably derived from the erosion of the volcanic arc. However, εNd530 values in the Cambrian shales (−5.2 to −4.0) together with older TDM ages (1444–1657 Ma), suggest a higher contribution of cratonic isotopic sources, probably derived from erosion of the adjacent mainland. Coeval with the progressive cessation of arc volcanism along the peri-Gondwanan realm during the Cambrian, there was a period of more tectonic stability and increasing arrival of sediments from cratonic areas. The geochemistry of the Ediacaran–Cambrian transition in Central Iberia documents a tectonic switch in the periphery of Gondwana, from an active margin to a more stable context related to the onset of a passive margin.
  • Publication
    U-Pb geochronology and isotopic geochemistry of adakites and related magmas in the Ediacaran arc section of the SW Iberian Massif: The role of subduction erosion cycles in peri-Gondwanan arcs
    (Elsevier, 2022-04-22) Rojo-Pérez, Esther; Linnemann, Ulf; Hofmann, Mandy; Fuenlabrada Pérez, José Manuel; Zieger, Johannes; Fernández Suárez, Javier; Andonaegui Moreno, Pilar; Sánchez Martínez, Sonia; Díez Fernández, Rubén; Arenas Martín, Ricardo
    In the peri-Gondwanan Ediacaran arc section outcropping in the SW of the Iberian Massif (Mérida region), changes in the subduction angle and subduction rate, variable participation of highly modified mantle sources together with the role of old crustal material and juvenile mafic rocks driven by the incoming slab, occur with a recognizable cyclicality and can be traced according to the geochronology, geochemistry and isotopic sources of the magmatic bodies. Our results support the initial existence of a mantle wedge highly modified due to percolation of significant volumes of variably old crustal materials, whose isotopic sources are almost identical to those found in the oldest known metasedimentary sequence described in SW Iberian Massif, the Serie Negra Group. Old crustal sources, analogous to those of this series were introduced to high depths by common subduction an also probably by significant subduction erosion. During the oldest period recorded in the study arc section, between c. 602 and c. 550 Ma, subduction episodes that involve high rates of crustal material along with an eventual incorporation of mafic and ultramafic materials from the incoming oceanic plate, favoured by low subduction angles, lead to the generation of more silicic magmas with adakitic geochemical affinity and isotopic signature (Nd-Sr) with crustal tendency. However, an increase in the subduction angle and change to a roll-back stage dated at c. 540 Ma, caused significant decrease in the access of cortical material to the subduction channel, favouring generation of typical calc-alkaline magmas derived from the modified mantle wedge, which is also consistent with more juvenile Nd-Sr ratios. The correlation found between the magmatic events and the involved tectonic processes suggests that subduction erosion mechanisms have been very likely underestimated as active dynamic processes along the peri-Gondwana margin during at least Neoproterozoic to Early Cambrian times.
  • Publication
    Geochemistry and tectonostratigraphy of the basal allochthonous units of SW Iberia (Évora Massif, Portugal): Keys to the reconstruction of pre-Pangean paleogeography in southern Europe
    (Elsevier, 2017-01) Díez Fernández, Rubén; Fuenlabrada Pérez, José Manuel; Chichorro, Martim; Pereira, M. Francisco; Sánchez Martínez, Sonia; Silva, José B.; Arenas Martín, Ricardo
    The basal allochthonous units of NW and SW Iberia are members of an intra-Gondwana suture zone that spreadsacross the Iberian Massif and was formed during the collision of Gondwana and Laurussia in the late Paleozoic. This suture zone is made of allochthonous terranes and is currently preserved as a tectonically dismembered ensemble. A multi-proxy analysis is applied to the basal allochthonous units of Iberia to test their affinity and potential usage for tracing a suture zone. A comparison of the lithostratigraphy, tectonometamorphic evolution, geochronology, and geochemical characteristics of the Ediacaran series of these units reveals striking affinities. They derive from rather similar immature sedimentary successions, deposited along the same continental margin, and in relation to a Cadomian magmatic arc. Sm–Nd systematics indicates that the isotopic sources are among the oldest of the Iberian Massif (ca. 2.15–1.5 Ga), suggesting a very strong contribution from the West African Craton. These Ediacaran series were affected by high-P and low- to medium-T metamorphism (blueschist to eclogite facies) during the Late Devonian (ca. 370 Ma). They occur below allochthonous ophiolitic sequences, and on top of autochthonous or parautochthonous domains lacking of high-P and low- to medium-T Devonian metamorphism, i.e., tectonically sandwiched between lithosphere-scale thrusts. The combination of all these characteristics makes these particular Ediacaran series different from the rest of the terranes of the Iberian Massif. Such singularity could be useful for tracing more occurrences of the same suture zone along the Variscan orogen, particularly in cases where its preservation and recognition may be cryptic. It also contributes to improve the paleogeographic reconstruction of the margin of Gondwana during the Ediacaran.
  • Publication
    Tectonostratigraphy of the Mérida Massif reveals a new Cadomian suture zone exposure in Gondwana (SW Iberia)
    (Taylor and Francis, 2021) Díez Fernández, Rubén; Arenas Martín, Ricardo; Rojo-Pérez, Esther; Sánchez Martínez, Sonia; Fuenlabrada Pérez, José Manuel
    Neoproterozoic and Palaeozoic rocks of the Mérida Massif (SW Iberia) have been grouped into tectonostratigraphic units. Each unit is separated from the rest ones by either crustal-scale thrusts and/or extensional detachments. The lowermost unit (Magdalena Gneisses; lower plate) has continental crust affinity, and rest below a mafic-ultramafic ensemble, referred to as the Mérida Ophiolite (suture zone). The Serie Negra Group constitutes a unit with continental crust affinity (Upper Schist-Metagranitoid Unit; upper plate) located on top of the Mérida Ophiolite. A carbonate-rich succession (Carija Unit) occupies the uppermost structural position. Structural and previous isotopic data suggest that this suture zone was formed during the Cadomian Orogeny. Superimposed shortening during the late Palaeozoic formed upright to NE-verging folds and thrusts that affected this suture zone and juxtaposed it onto Ordovician strata during the Variscan Orogeny. The Mérida Ophiolite represents a new Cadomian suture zone exposure in the Gondwanan realm of the Iberian Massif, but its root zone is yet to be identified. This ophiolite shares a far-travelled nature with other Cadomian and Variscan suture zone exposures in Iberia, making the latter a piece of lithosphere built through inland transference of allochthonous terranes from peri-Gondwana onto mainland Gondwana during the Neoproterozoic-Cambrian and the Devonian-Carboniferous periods.