G. Galán's research while affiliated with Autonomous University of Barcelona and other places

Publications (23)

Article
Full-text available
Mantle xenoliths in Neogene-Quaternary alkaline volcanic rocks from the Catalan Volcanic Zone indicate that ≪anhydrous≫ spinel lherzolites, harzburgites and much subordinate olivine websterites form the lithospheric mantle of NE Iberian Peninsula. Olivine crystal preferred orientation, determined by indexation of electron-backscattered diffraction...
Article
Mantle xenoliths in Neogene-Quaternary basaltic rocks related to the European Cenozoic Rift System serve to assess the evolution of the subcontinental lithospheric mantle beneath the Catalan Volcanic Zone in NE Spain. Crystallographic preferred orientations, major element composition of minerals, and temperature and pressure estimates have been use...
Article
Full-text available
Olivine hornblendites (cortlandtites) form part of the Montnegre mafic complex related to late-Variscan I-type granitoids in the Catalan Coastal Ranges. Two generations of spinel are present in these hornblendites: Spl1 forms euhedral crystals included in both olivine and Spl2. Spl2 forms euhedral to anhedral crystals associated with phlogopite and...
Article
Full-text available
This study deals with textural types and major element compositions of Cu-Ni-Fe sulphides from spinel lherzolite, harzburgite and olivine websterite xenoliths found in alkali basaltic rocks of the Neogene-Quaternary volcanic zone of Catalonia (NE Spain). Sulphides in harzburgites and websterites are scarce. Four textural types have been distinguish...
Poster
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Olivine hornblendites, hornblende gabbros, leucogabbros and hornblende biotite quartz diorites form small stocks and enclaves scattered at the contact between post-tectonic I-type Variscan granitoids and metamorphic country rocks of the Montnegre massif..
Article
The study of major and trace element compositions of whole rocks and minerals, along with SrNd isotopes on separated clinopyroxene crystals, from mantle xenoliths in Neogene–Quaternary basaltic rocks, serves to evaluate the processes which have affected the subcontinental lithospheric mantle in the Catalan Volcanic Zone of NE Spain, and to compare...
Article
Full-text available
Ultrabasic-basic to intermediate rocks appear associated with Late Hercynian calcoalcaline granites of the Montnegre Massif. The most basic rocks are olivine hornblendites, with spinel, clinopyroxene, orthopyroxene, different types of amphibole, and phlogopite. There are also hornblende melagabbros- gabbros and leucogabbros, with subordinate amphib...
Article
Mantle xenoliths in alkaline mafic lavas and pyroclasts from the Neogene-Quaternary volcanism in NE Spain are studied using major, trace element geochemistry and Sr-Nd isotopes, to compare the lithospheric mantle of this area with that of other European zones, and to assess the different processes that conditioned its evolution. The xenoliths mostl...
Article
Mantle xenoliths in within-plate Cenozoic alkaline mafic lavas from NE Spain are used to assess the local subcontinental lithospheric mantle geotherm and the influence of melting and metasomatism on its oxidation state. The xenoliths are mainly anhydrous spinel lherzolites and harzburgites and gradations between, with minor pyroxenites. Most types...
Article
Mantle xenoliths in within-plate alkaline matic lavas from NE Spain are mainly anhydrous spinel lherzolites and harzburgites, grading into each other, and subordinate pyroxenites. Peridotites followed an earlier melt depletion caused by mantle decompression and subsequent metasomatism. Two main types of metasomatism are differentiated affecting mai...
Article
Full-text available
The upper tectonic unit of the Cabo Ortegal Complex (northwest Spain) comprises an ordered rock sequence of ultramafic and mafic rocks and quartzofeldspathic gneisses. The entire assembly forms part of a transitional mafic crust. In an early Paleozoic subduction episode, most of this crust was metamorphosed at eclogite facies and high-pressure gran...
Article
A correction procedure is proposed to account for the effect of secondary X-ray fluorescence near grain boundaries in electron microprobe analysis. The procedure is based on the Monte Carlo simulation method, which is used to calculate the X-ray spectrum emitted by the mineral couple (i.e., the mineral of interest with the neighboring mineral). The...
Article
Full-text available
The Cabo Ortegal Complex is a composite allochthonous terrane that was thrust onto the western edge of Gondwana during the Variscan orogeny. It is formed of two main tectonic units: the Upper Tectonic unit, comprising rocks affected by highpressure (P)–high-temperature (T) metamorphism, and the Lower Tectonic unit, which represents the resulting su...
Article
The high pressure mafic granulites of the Bacariza Formation outcrop in the two uppermost structural units of the Cabo Ortegal Complex (La Capelada unit and Cedeira unit) were separated by a Variscan thrust. In both cases, they appear as heterogeneous metabasites in normal contact between ultramafic rocks and other more homogeneous and less differe...
Article
Full-text available
 The Cabo Ortegal complex (northwestern Iberian massif) is a klippen formed of several structural units stacked during the Hercynian collision. All these units include ultramafic rocks, metabasites and quartz-feldspathic gneisses affected by different metamorphic conditions. The Bacariza formation is heterogeneous showing a conspicuous layering mai...
Article
The Gueret massif (Massif Central, France) is mainly composed of granitoids that define an alumino-potassic association. An age of 356 +/- 10 Ma is accepted for the intrusion of these granitoids for which a pure crustal origin has been suggested. However, the presence of mafic magmatic enclaves and of scattered stocks and dykes of amphibole-biotite...
Article
Late-stage, epizonal calc-alkaline granitoids of the Hercynian belt are often associated with coeval more basic rocks. Such granitoids have been the focus of special attention when studying the role of mantle-derived magmas in granitoid genesis. These studies conclude that basic magmas are involved in granitoid production but their contribution to...

Citations

... 291 and 285 Ma [36]). This massif also contains ultrabasic/basic-to-intermediate rocks associated with late-Variscan calc-alkaline granites, showing mineralogical and geochemical characteristics typical of appinite suites, with cumulate hornblendites and gabbros crystalized from K-rich and fluid-rich magmas, and a complex mingled zone between diorites and biotite granodiorites [37,38]. ...
... Thermobarometric estimates, using the twopyroxene thermometer of Brey and Köhler (1990), provide higher equilibrium temperature (T) for harzburgites (1062 ± 29 ºC) and websterites (up to 1257 ºC) than for lherzolites (972 ± 89 ºC) (Galán et al., 2011). More recently, Fernández-Roig and Galán (2015) found that equilibrium T in lherzolites decreases from those with protogranular microstructure (1082-950 ºC) towards porphyroclastic (959-867 ºC) and equigranular lherzolites (995-829 ºC), and that estimates using integrated compositions of clinopyroxene and/or clinopyroxene porphyroclasts and mutual exsolved lamellae (1125-955 ºC) are higher and comparable to those registered by protogranular lherzolites and harzburgites. Decreasing T from protogranular towards porphyroclastic and equigranular peridotites was also found in similar xenoliths from the Carpathian-Panonian region (Szabó et al., 2004). ...
... The BA-index has values between 0 and 1, the formula is shown as 0.5(2 − (P010/(G010 + P010)) − (G100/ (G100 + P100))). Generally we classified axial-[010] as having a BA-index lower than 0.4, orthorhombic as between 0.4 and 0.6, and axial-[100] as higher than 0.6 as used previously (Fernández-Roig et al., 2017;Puelles et al., 2016;Zaffarana et al., 2014). ...
... The latter are heterogeneous paragneisses whose contacts are outlined by ultramafic rocks interpreted as mantle fragments incorporated into the subduction zone (Gil Ibarguchi et al., 1999). The eclogites have been interpreted as a metamorphosed volcano-sedimentary sequence (Albert et al., 2012) while the granulite protoliths are uncertain, potentially including volcanic-arc upper crust (Galán and Marcos, 1998). The ultramafic rocks are exposed in three main massifs; the largest, Herbeira (~12.5 km 2 ), is the object of this study (Fig. 1c). ...
... Montero and Floor, 2004;Valverde-Vaquero et al., 2005;Dias da Silva et al., 2016), the Beira Baixa-Central Extremadura tonalite-granodiorite belt of I-type affinity (Rubio-Ordóñez et al., 2012), basaltic and albititic layers in the WALZ (e.g. Roel, 1994;Corretgé et al., 2004), volcanic rocks in the Iberian Ranges (e.g. Álvaro et al., 2008), and the basaltic and volcanosedimentary Castro Fm. and the cineritic level within the Armorican Quartzite in the CZ (e.g. ...
... Several studies on the petrology and geochemistry of the CVZ volcanic rocks and their associated mantle and crustal xenoliths have been published in the last decades (Araña et al. 1983;López-Ruiz and Rodríguez-Badiola 1985;Martí et al. 1992;Neumann et al. 1999;Cebriá et al. 2000;Galán et al. 2016). These volcanic rocks are homogeneous in their major element contents. ...
... There are several generations of calc-alkaline granites and * * * alumnious leucogranites that intruded between 307 and 284 Ma. Syn-kinematic intrusions show a close spatial relation to high-grade metamorphic rocks and migmatites, whereas post-kinematic intrusions mainly occur in zones of low-grade metamorphism (Corretge et al., 1990). Based on tectonostratigraphic relations, the Central Iberian Zone is divided into Autochthonous and Allochthonous sequences that both are dominated by Ordovician to Carboniferous sedimentary rocks, but differ in metamorphic grade and deformation style and most importantly their relation to older rocks. ...
... Relict crystals from the starting material may be present if the starting material was not fully melted (Mutch et al., 2016). The relatively small size of experimental products also enhances EPMA uncertainty relative to natural crystals, because the interaction volume of the electron beam may directly enter other phases, and neighboring phases may inf luence the measurement through secondary f luorescence (Llovet & Galan, 2003;Fig. 1d). ...
... Such a value (i.e., Ce N < 0.3 and La N < 0.1) is more than one order of magnitude lower than those in our samples. On the other hand, the LREE-depleted REE patterns shown here are quite similar to those reported by many previous studies (e.g., Bedini et al., 1997;Xu et al., 2003;Mü ntener et al., 2004;Ying et al., 2006;Le Roux et al., 2007;Soustelle et al., 2009;Bianchini et al., 2011;Ackerman et al., 2014;Galán and Oliveras, 2014), which have clearly demonstrated that such REE patterns are due to extensive interaction of mantle rocks with LREE-depleted melts. Second, Al 2 O 3 and CaO contents are nearly linearly correlated with MgO contents in our samples (Fig. 5). ...
... Peridotite xenoliths exhumed by Cenozoic alkaline volcanoes are an essential source of information about the nature and evolution of the subcontinental lithospheric mantle (e.g., Downes, 2001). In the Iberian Peninsula there are four main Cenozoic volcanic fields that contain significant mantle xenoliths suites: SE Spain (Avanzinelli et al., 2020;Beccaluva et al., 2004), Olot (Bianchini et al., 2007;Galán et al., 2008), Levante (Seghedi et al., 2002) and Calatrava (Ancochea and Nixon, 1987). ...