Person: Galindo Francisco, María Del Carmen
Loading...
First Name
María Del Carmen
Last Name
Galindo Francisco
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Mineralogía y Petrología
Area
Petrología y Geoquímica
Identifiers
13 results
Search Results
Now showing 1 - 10 of 13
Item The evolution of a mid-crustal thermal aureole at Cerro Toro, Sierra de Famatina, NW Argentina(Lithos (Oslo. Print), 2014) Alasino, Pablo H.; Casquet Martín, César; Larrovere, M.A.; Pankhurst, R.J.; Galindo Francisco, María Del Carmen; Dahlquist, Juan A.; Baldo, Edgardo G.; Rapela, Carlos W.A sheeted tonalite complex at Cerro Toro in western Sierra de Famatina, Argentina, was emplaced in the middle crust during an early phase of the Ordovician Famatinian orogeny. The intrusion produced a large-scale thermal aureole that provoked significant melting of the host rocks and hybridization of the anatectic melts with the tonalitic magmas. Three zones were distinguished in a cross-section: (1) an external zone consisting of metatexitic gneisses, amphibolites and minor tonalites, (2) an intermediate zone formed by screens of highly melted gneisses and amphibolites lying between the tonalite sheets: stoped blocks of gneisses within the tonalite sheets, small bodies of metagabbro and hybrid rocks are common in this zone, (3) an internal zone formed almost exclusively of massive tonalite. Incongruent melting of biotite in gneisses of the intermediate zone produced abundant cordierite and garnet; anatectic granitoids developed in the innermost part at 750–800ºC and ca. 5kbar. High water activities within this zone eventually promoted significant melting of plagioclase + quartz in the gneisses. Pooling of anatectic magmas resulted in allochthonous bodies of variable size either concordant or discordant to the regional structural grain, and part were retained in or close to the residuum. Allochthonous granitoids did not reach isotopic equilibrium with the source protolith probably due to fast extraction of the melts. The Cerro Toro contact aureole shows that assimilation of metasedimentary rocks through partial melting can be an important mechanism during emplacement of tonalitic magmas at middle crust levels. Thus the chemistry of cordilleran magma can be modified as they rise through the crust.Item Thermal maturation of a complete magmatic plumbing system at the Sierra de Velasco, Northwestern Argentina(Geological magazine, 2021) Macchioli Grande, Marcos; Alasino, Pablo H.; Dahlquist, Juan A.; Morales Cámera, Matías M.; Galindo Francisco, María Del Carmen; Basei, Miguel A.S.The formation of magmatic plumbing systems in the crust involves mass and heat transfer from deep to shallow levels. This process modifies the local geotherm and increases the thermal maturation of the crust, affecting the rheological state of the host rock and the composition of magma. Here, we report a petrological, geochemical, isotopic and geochronological integrated study of the Huaco (354 Ma) and Sanagasta (353 Ma, from a new U–Pb zircon age) units from the Carboniferous (Lower Mississippian) Huaco Intrusive Complex, NW Argentina. Similar values of ϵNdt and δ18O, of −3.2 ± 0.7 and +11.2‰ ± 0.3‰ (V-SMOW), respectively, for both units indicate that they shared the same source, as a result of mixing and later homogenization of a crustal component at the Late Devonian (378 to 366 Ma), with metasomatized mantle-derived melts. Slightly higher contents of TiO2, FeO, MgO, CaO and rare earth elements for the Sanagasta unit in comparison with the Huaco unit suggest an increase in the degree of partial melting, which may have been caused by a higher temperature at the lower crust. In addition, the previous structural model of the Huaco Intrusive Complex points to an increase in thermal maturation in the upper crust, which drives a change in the emplacement style from tabular subhorizontal (Huaco) to vertically elongated (Sanagasta) bodies. Therefore, the evolution of the intrusive complex may reflect a generalized thermal maturation of the complete magmatic column, at both upper and lower crustal levels.Item The Faja Eruptiva of the Eastern Puna and the Sierra de Calalaste, NW Argentina: U–Pb zircon chronology of the early Famatinan orogeny(Journal of iberian geology, 2021) Casquet Martín, César; Alasino, Pablo H.; Galindo Francisco, María Del Carmen; Dahlquist, Juan A.; Baldo, Edgardo G.; Ramacciotti, Carlos; Verdecchia, Sebastián; Larrovere, Mariano Alexis; Rapela, Carlos W.; Recio, C.The Famatinian is a segment of the Ordovician Terra Australis accretionary orogen that stretched along the SW Margin of Gondwana from Australia to Colombia. The present knowledge of this orogenic segment still is incomplete. We present geochemistry and U–Pb SHRIMP zircon geochronology of igneous and metamorphic rocks from the Central Famatinian Domain, one of the several domains recognized by Rapela et al. (Earth Sci Rev 187: 259–285. https://doi.org/10.1016/j.earscirev.2018.10.006) that includes the northern Sierras Pampeanas and the southern Puna of North West Argentina. Six samples of igneous rocks (peraluminous granitoids, mafic and felsic rocks, volcanic/subvolcanic rocks) and six samples of associated meta-sedimentary rocks, all from the Puna were dated and chemically analysed. The results indicate that the Central Famatinian Domain is in turn a composite domain that includes a Cordilleran-type magmatic arc (ca. 470 Ma) and a yuxtaposed fault-bounded older terrain formed in an extensional setting at the very start of the Famatinian orogeny, between 480 and 485 Ma, i.e., shortly after the SW Gondwana margin switched from passive to active. This short period of extension with related sedimentation, volcanism and mainly granitoid plutonism has not been previously recognised. It occurred before the Cordilleran-type magmatic arc -that resulted from a magmatic flare-up between ca. 473 and 468 Ma-, set up coincident with a contractional phase. The evidence confirms that accretionary orogeny results from tectonic switching (pull–push orogeny) and that the extensional and contractional phases are of relatively short duration.Item Diferencias entre granates de rocas ígneas y metamórficas de edad Famatiniana (Ordovícico), en las Sierras Pampeanas (Argentina)(Macla, 2006) Dahlquist, Juan A.; Alasino, Pablo H.; Galindo Francisco, María Del Carmen; Casquet Martín, CésarLos granates metamórficos de los esquistos de la zona de la biotita de la sierra de Chepes son ricos en Mn y tienen composiciones muy parecidas a la de los granates ígneos de diferentes rocas graníticas de edad Famatiniana (Ordovícico) de la misma región. Por tanto, el contenido de Mn, por sí mismo, no es suficiente para discriminar el origen de estos minerales, que pueden presentarse como cristales ígneos o como xenocristales en el granito. Por el contrario, el tipo de zonación del Mn permite distinguir entre ambas situaciones, al menos en el caso de granitoides cristalizados por encima de 700ºC.Item Evolución magmática del Granito Peñón Rosado, cerro Asperecito, flanco occidental de la Sierra de Famatina(Revista de la Asociación Geológica Argentina, 2006) Dahlquist, Juan A.; Alasino, Pablo H.; Galindo Francisco, María Del Carmen; Rapela, Carlos W.; Saavedra, Julio; Casquet Martín, César; Baldo, Edgardo G.; González Casado, José Manuel; Fanning, C.M.El granate es un mineral accesorio poco común en rocas ígneas y constituye un tema relevante de la petrología ígnea. Estudios combinados de petrología, química mineral, geoquímica de roca total y geoquímica isotópica en el cerro Asperecito indican que los granitoides con granate que forman el Granito Peñón Rosado (GPR) fueron producidos por la fusión parcial de rocas metasedimentarias con subsecuente diferenciación durante su emplazamiento en el Ordovícico temprano-medio. En este sentido, la facies GPR1 representa un cristalizado temprano, la facies GPR2 representa un fundido diferenciado, y la facies GPR3 un fundido residual. El Granito Peñón Rosado, fue emplazado en condiciones de alta temperatura (785ºC) y presión media (4,4 kb) en profundidades de la corteza media ( 15 km). El emplazamiento casi sincrónico en la corteza media de una abundante suite metaluminosa durante el Ordovícico inferior-medio (468 Ma en el cerro Asperecito) fue suficiente para inducir anatexis local de los metasedimentos circundantes. Los contenidos de elementos mayoritarios (CaO, Na2O) y elementos traza (Rb, Sr, Ba) en el Granito Peñón Rosado sugieren anatexis a partir de un material inmaduro acumulado en un plataforma continental. Así, el Granito Peñón Rosado es un típico granitoide tipo-S con granate y el modelo establecido aquí puede contribuir a un mejor entendimiento acerca de la cristalización del granate en rocas graníticas.Item Plutón La Costa, una expresión de magmatismo tipo-s en el sector noreste de la Sierra de Velasco, Sierras Pampeanas.(Revista de la Asociación Geológica Argentina, 2006) Alasino, Pablo H.; Dahlquist, Juan A.; Galindo Francisco, María Del Carmen; Casquet Martín, CésarEstudios combinados de petrología, química mineral y geoquímcia de roca total revelan la presencia de dos unidades graníticas peraluminosas con minerales aluminosos magmáticos tales como granate y mica blanca y la presencia distintiva de turmalina. Las evidencias aquí presentadas indican que estas dos facies, Anillaco y Anjullón, junto a la unidad peraluminosa Santa Cruz estudiada en trabajos previos, constituyen una serie de rocas co-sanguíneas, emplazadas en niveles someros de la corteza y las cuales conforman una unidad ígnea mayor denominada aquí plutón La Costa, la cual aflora en el sector noreste de la sierra de Velasco. La asociación mineral, la química mineral y la geoquímica de roca total permiten definir al plutón La Costa como un clásico granitoide tipo–S, derivado de una roca fuente de composición esencialmente pelítica. Diferentes estudios demuestran que la generación de granitoides tipo-S requiere de un alto gradiente geotérmico, por lo cual el plutón La Costa indica que la corteza en esta región soportó un notable calentamiento durante la generación del magma. Sin embargo, la ausencia de datos geocronológicos impide definir el evento tectomagmático que produjo el magma primordial de este plutón. [ABSTRACTS] La Costa pluton, an expresion of S- type magmatism in the northeastern sector of the Sierra de Velasco, Sierras Pampeanas. Combined petrology, mineral chemistry and whole-rock geochemistry studies reveal the presence of two peraluminous granitic units with magmatic aluminous minerals, such as garnet and white mica, and the distinctive presence of tourmaline. The evidence presented here indicates that these two facies, Anillaco and Anjullón, together with the peraluminous Santa Cruz unit studied in previous works, constitute co-sanguineous rocks, emplacemed in shallow levels of the crust, conforming a greater igneous unit, named here as La Costa pluton, that outcrops in the northeast sector of the sierra de Velasco. The mineral assemblage, the mineral chemistry and the whole-rock geochemistry allow defining the La Costa pluton as classic S-type granitoids, derived of a source rock of dominant pelitic composition. Several studies demonstrate that a high geothermal gradient is required for the generation of S-types granitoids, thus the La Costa pluton indicates that the crust supported a remarkable heating in this region during the generation of the magma. However, the absence of geochronological data prevents identification of the tectomagmatic event that yielded the parental magma of this pluton.Item O–H–Sr–Nd isotope constraints on the origin of the Famatinian magmatic arc, NW Argentina(Geological Magazine, 2020) Alasino, Pablo H.; Casquet Martín, César; Galindo Francisco, María Del Carmen; Pankhurst, R.J.; Rapela, Carlos W.; Dahlquist, Juan A.; Recio, C.; Baldo, Edgardo G.; Larrovere, Mariano Alexis; Ramacciotti, CarlosWe report a study of whole-rock O–H–Sr–Nd isotopes of Ordovician igneous and metamorphic rocks exposed at different crustal palaeodepths along c. 750 km in the Sierras Pampeanas, NW Argentina. The isotope compositions preserved in the intermediate rocks (mostly tonalite) (average δ18O = +8.7 ± 0.5‰, δD = −73 ± 14‰, 87Sr/86Srt = 0.7088 ± 0.0001 and εNdt = −4.5 ± 0.6) show no major difference from those of most of the mafic rocks (average δ18O = +8 ± 0.8‰, δD = −84 ± 18‰, 87Sr/86Srt = 0.7082 ± 0.0016 and εNdt = −4 ± 1.1), suggesting that most of their magmas acquired their crustal characteristics in the mantle. The estimate of assimilation of crustal material (δ18O = +12.2 ± 1.7‰, δD = −89 ± 21‰, 87Sr/86Srt = 0.7146 ± 0.0034 and εNdt = −6.9 ± 0.7) by the tonalite is in most samples within the range 10–20%. Felsic magmas that reached upper crustal levels had isotope values (δ18O = +9.9 ± 1.5‰, δD= −76 ± 5‰, 87Sr/86Srt = 0.7067 ± 0.0010, εNdt = −3.5 ± 1.4) suggesting that they were not derived by fractionation of the contaminated intermediate magmas, but evolved from different magma batches. Some rocks of the arc, both igneous (mostly gabbro and tonalite) and metamorphic, underwent restricted interaction with meteoric fluids. Reported values of δ18O of magmatic zircons from the Famatinian arc rocks (+6 to +9‰) are comparable to our δ18O whole-rock data, indicating that pervasive oxygen isotope exchange in the lower crust was not a major process after zircon crystallization.Item New SHRIMP U-Pb data from the Famatina Complex: constraining Early-Mid Ordovician Famatinian magmatism in the Sierras Pampeanas, Argentina(Geologica acta, 2008) Dahlquist, Juan A.; Pankhurst, R.J.; Rapela, Carlos W.; Galindo Francisco, María Del Carmen; Alasino, Pablo H.; Fanning, C.M.; Saavedra, Julio; Baldo, Edgardo G.New SHRIMP U-Pb zircon ages are reported for igneous and sedimentary rocks of the Famatina Complex, constraining the age of the magmatism and the ensialic basins. Together with whole-rock and isotope geochemistry for the igneous rocks from the complex, these ages indicate that the voluminous parental magmas of metaluminous composition were derived by partial melting of an older lithosphere without significant asthenospheric contribution. This magmatism was initiated in the Early Ordovician (481 Ma). During the Mid-Late Ordovician, the magmatism ceased (463 Ma), resulting in a short-lived (no more than ~20 Ma) and relatively narrow (~100-150 km) magmatic belt, in contrast to the long-lived cordilleran magmatism of the Andes. The exhumation rate of the Famatina Complex was considerably high and the erosional stripping and deposition of Ordovician sediments occurred soon after of the emplacement of the igneous source rocks during the Early to mid-Ordovician. During the upper Mid Ordovician the clastic contribution was mainly derived from plutonic rocks. Magmatism was completely extinguished in the Mid Ordovician and the sedimentary basins closed in the early Late Ordovician.Item Caracterización petrográfica y química de cordieritas de origen ígneo y metamórfico en el plutón de Cerro Toro (Argentina)(Macla, 2006) Alasino, Pablo H.; Dahlquist, Juan A.; Galindo Francisco, María Del Carmen; Casquet Martín, CésarEn este trabajo se presentan dos casos de cordieritas de comprobado origen ígneo y metamórfico en el plutón de Cerro Toro (Sierras Pampeanas, Argentina). A partir de comparaciones petrográficas y de química mineral entre dichas cordieritas, se concluye que los estudios combinados de petrografía y química mineral son una herramienta muy útil para discernir el origen de las cordieritas, contribuyendo al estudio petrogenético de magmas peraluminosos con presencia de este mineral.Item Granitoides peraluminosos con andalucita y cordierita magmáticas en la sierra de Velasco: implicancias para el orógeno famatiniano.(Serie D Publicaciones especiales - Asociación Geológica Argentina, 2005) Alasino, Pablo H.; Dahlquist, Juan A.; Galindo Francisco, María Del Carmen; Baldo, Edgardo G.; Casquet Martín, CésarLa combinación de estudios petrológicos, geoquímicos y de química mineral en el sector noreste de la sierra de Velasco, a la latitud de la localidad de Santa Vera Cruz, revelan la presencia de una unidad ígnea peraluminosa con andalucita (Si = 3,85, Al = 8,14 y Fe3+ = 0,04) y cordierita (K+Na = 0,33 y XFe = 0,40) magmáticas, la cual es denominada unidad Santa Cruz. La aluminosisad del magma (ISA = 1,30 - 1,42), evidenciada por la presencia de minerales aluminosos como cordierita, andalucita y muscovita y la geoquímica de roca total indican que esta unidad fue derivada de fusión parcial de una secuencia metasedimentaria (esencialmente pelítica) en la corteza superior, que se emplazó en un rango de presión - temperatura de 2 a 2,4 kbar y 670 a 720 ºC. Notablemente, las características geoquímicas de la unidad Santa Cruz sugieren una roca fuente diferente a la establecida para otras unidades peraluminosas del orógeno famatiniano. [ABSTRACT] Peraluminous granitoids with magmatic andalusite and cordierite in the Sierra de Velasco: Implications to the Famatinian Orogen. The combination of petrological, geochemical and mineral/chemical data for the NE sector of the Sierra de Velasco, at the latitud of the Santa Vera Cruz town, reveal the presence of peraluminous igneous unit with magmatic andalusite and cordierite, which has been named Santa Cruz unit. The aluminous of magma (ASI = 1.30 - 1.42), evident by the presence of aluminous minerals such as cordierite, andalusite and muscovite and the whole-rock geochemical, principally indicate that this unit was derived of the partial melting of a metasedimentary secuency (mainly pelitic) in the upper crustal, which was emplaced a pression - temperature range of 2 to 2.4 kb and 670 to 720 ºC. Remarkably, the geochemical characteristics of Santa Cruz unit suggest a different source rock than other peraluminous units founded in the Famatinian Orogen.