Person:
Fuenlabrada Pérez, José Manuel

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First Name
José Manuel
Last Name
Fuenlabrada Pérez
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https://hdl.handle.net/20.500.14352/87137
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
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    A peri-Gondwanan arc in NW Iberia. II: Assessment of the intra-arc tectonothermal evolution through U–Pb SHRIMP dating of mafic dykes
    (Gondwana research, 2009) Díaz García, Florentino; Sánchez Martínez, Sonia; Castiñeiras García, Pedro; Fuenlabrada Pérez, José Manuel; Arenas Martín, Ricardo
    The arc-derived upper units of the Órdenes Complex, NW Iberia, are emplaced above the Variscan suture and contain a low-grade metasedimentary uppermost section, with a maximum depositional age of 510–530 Ma, intruded by a number of mafic dykes. Three deformational events affect the metasedimentary section. The youngest deformation event (D3) is of undifferentiated Variscan age and consists of metre- to decametre-scale, close upright folds with axes plunging gently towards N20°E. The most important D2 structure is a regional S2 foliation axial planar of minor foldswith dextral asymmetry. The presence of a stretching lineation parallel to the D2 fold axes is related to a top-to-the-north sense of shearing in a context of regional extension. The oldestmeterscale D1 folds are developed in suitable greywacke–pelite alternations and consist of tight folds with chevron and similarmorphologies, axes plunging gently toward N20°E, and a continuous S1 axial planar foliation. The essential characteristic of the D1 deformation event is depicted by a set of west-vergent folds with reverse limbs less than 2 kmin wavelength, that are affected in their lower part by the generalised presence of the regional S2 foliation. The age of D2 and D1 structures is notwell constrained. The diabase dykes intruding the low-grade turbidites cut the D1 folds and their field relationships suggest that they were emplaced at the end of the D2 shearing event and prior to the upright D3 Variscan folds. Zircon grains obtained from one of the diabase dykes were analysed for U–Pb at the SHRIMP-RG facility at Stanford University. An age of c. 510 Ma, based on the analysis of 31 individual zircon grains, is interpreted to date the crystallization of the Ares dyke. The tectonic and magmatic evolution of the top turbiditic series of the Órdenes Complex is tentatively related to the dynamics of a peri- Gondwanan arc developed during active subduction beneath Gondwana and suggests: (1) accretion beneath the arc during west-vergent (present coordinates) nappe development (D1); (2) extension of the arc during top-tothe- north shearing (D2); and (3) final intrusion of the diabasic dykes into an intra-arc turbiditic series. This evolution spans the end of volcanic arc activity and the onset of the opening of the Rheic Ocean.
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    Geochemistry of metasedimentary rocks from the Eastern Pyrenees (Iberian Peninsula): Implications for correlation of Ediacaran terranes along the Gondwanan margin
    (Precambrian Research, 2023) Rojo Pérez, Esther; Druguet, Elena; Casas, Josep M.; Proenza Fernández, Joaquin Antonio; Fuenlabrada Pérez, José Manuel; Sánchez Martínez, Sonia; Garcia Casco, Antonio; Arenas Martín, Ricardo
    The North African margin of Gondwana formed by subduction and accretion during Ediacaran to Cambrian times. Sections of this active margin were incorporated during the late Paleozoic to the Variscan and Appalachian orogens. In the Variscan realm, these sections define in some regions a Cadomian basement comprising thick metasedimentary series associated with coeval subduction-related magmatic rock dated in the range 650–500 Ma. In the Cap de Creus Massif (Eastern Pyrenean domain), the Cadomian metasedimentary rocks formed from sediments derived from mixed felsic and intermediate/mafic sources, intruded by granitoid and minor mafic igneous rocks. These series were formed in a peri-Gondwanan volcanic arc setting, like other Cadomian series described in the SW of the Iberian Massif, such as Serie Negra Group of the Ossa Morena Complex. However, the Nd model ages of the Cap de Creus metasedimentary samples range from 1431 to 1620 Ma and are younger than those of their SW Iberia equivalents. This result can be interpreted as an indication of an eastern location in the Ediacaran - Cambrian peri-Gondwanan magmatic arc. Furthermore, the Cadomian series in the Central Iberian Zone have even younger Nd model ages than those of SW and NE Iberia. We present two end-member paleogeographic models consistent with reconstruction of the initial location of the Cap de Creus Massif and its relations with other domains (Ossa Morena Complex and Central Iberian Zone) in this sector of the North African Gondwanan margin.