Person:
Galindo Francisco, María Del Carmen

First Name

María Del Carmen

Last Name

Galindo Francisco

URI

https://hdl.handle.net/20.500.14352/81297

Affiliation

Universidad Complutense de Madrid

Faculty / Institute

Ciencias Geológicas

Department

Mineralogía y Petrología

Area

Petrología y Geoquímica

Identifiers

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Now showing 1 - 10 of 103

Síntesis geocronológica de la evolución paleozoica inferior del borde sur occidental de Gondwana en las Sierras Pampeanas, Argentina
(Acta geológica hispánica, 1997) Baldo, Edgardo G.; Saavedra, Julio; Rapela, Carlos W.; Pankhurst, R.J.; Casquet Martín, César; Galindo Francisco, María Del Carmen
Las Sierras Pampeanas Argentinas constituyen un buen registro de la evolución Pre-Devónica del margen sur occidental del Gondwana. Los trabajos multidisciplinarios recientes y especialmente la información geocronológica, recolectada a lo largo de una transecta E-W de aproximadamente unos 500 km, permiten precisar la edad y los rasgos geológicos de los dos principales ciclos tectono-magmáticos involucrados en la evolución paleozoica inferior de esta parte del basamento argentino. El Ciclo Orogénico Pampeano comienza con una etapa de sedimentación en un margen pasivo (560-530 Ma), que evoluciona hacia una situación de margen activo con generación de un arco magmático tipo Andino, a los 533 - 528 Ma. El ciclo finaliza hacia los 523 Ma. en una colisión de tipo ortogonal, con un importante engrosamiento cortical, anatexis regional y generación de granitos "S". El "Ciclo Orogénico Famatiniano" se inicia a los 499-496 Ma y se caracteriza por la implantación de un arco magmático intemo de tipo trondhjemitico, seguido hacia el oeste por un importante arco magmático externo, contemporáneo con el anterior y formado por granodioritas de tipo "1" y grandes batolitos graníticos de tipo "S". Durante el Famatiniano tiene también lugar la formación de una cuenca de retroarco ensiálica con magmatismo básico. El final de este ciclo (450-420 Ma) está marcado por el desarrollo de importantes fajas de milonitización que marcan la colisión oblicua del Terreno Precordillera respecto al margen de Gondwana
The Difunta Correa metasedimentary sequence (NW Argentina): relict of a Neoproterozoic platform? — elemental and Sr-Nd isotope evidence
(Revista mexicana de ciencias geológicas, 2015) Ramacciotti, Carlos; Casquet Martín, César; Baldo, Edgardo G.; Galindo Francisco, María Del Carmen
The Sierra de Pie de Palo (Western Sierras Pampeanas, Argentina) in the Andean foreland is mainly formed by a Mesoproterozoic basement and an Ediacaran metasedimentary over referred to as the Difunta Correa metasedimentary sequence. The latter is key to understanding the characteristics of this region prior to the early Cambrian assembly of SW Gondwana. It is composed of low- to medium grade metamorphic rocks (metasandstones, mica-chists, Ca-pelitic schists, metaconglomerates, marbles and less abundant amphibolites) that can be grouped into four informal lithostratigraphic units. The chemical composition of these rocks allows to classify the siliciclastic protoliths as shales, Fe-shales and immature sandstones (wackes, sub-litharenites, litharenites and Fe-sandstones). The sediments were derived from an evolved felsic to intermediate continental source and were deposited on a continental passive margin overlaying a Mesoproterozoic basement that crops out at several places of the Western Sierras Pampeanas. Thick marine carbonate beds with seawater isotope composition, phosphatic clasts and the lack of contemporaneous, arc related igneous rocks, also support a passive margin sedimentation. Phosphatic clasts within metaconglomerates are described for the first time in the Sierras Pampeanas and were probably formed after an important Neoproterozoic glaciation (Marinoan). We further suggest, based on our data and previous works, that the passive margin probably belonged to the Paleoproterozoic MARA (acronym of Maz, Arequipa, Río Apa) continental block. MARA, which remained juxtaposed to Laurentia since the middle to late Mesoproterozoic orogenies until its eventual drifting in the late Neoproterozoic, finally accreted to SW Gondwana in early Cambrian times during the Pampean orogeny.
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.
The strongly peraluminous A-type granites of the Characato suite (Achala batholith), Sierras Pampeanas, Argentina: Evidence of Devonian-Carboniferous crustal reworking
(Journal of South American Earth Sciences, 2018) Morales Cámera, Matías M.; Dahlquist, Juan A.; Ramacciotti, Carlos D.; Galindo Francisco, María Del Carmen; Basei, Miguel A.S.; Zandomeni, Priscila S.; Macchioli Grande, Marcos
The largest igneous body in the Sierras Pampeanas (the Achala batholith) is composed by several magmatic intrusions. How many plutons form this batholith and its intrusive history remains unclear. The emplacement of the batholith began at ca. 380 Ma; the Characato suite, in the northern extreme of the body, represents a relatively young intrusive phase in its construction (ca. 360 Ma). This suite, composed mainly of two-mica monzogranites, correspons to a strongly peraluminous A-type magma (A/CNK > 1.1) with fractionated compositions (high Rb/Sr and Rb/Ba). The parental magma corresponds to a high temperature melt generated by biotite dehydration melting, which was then differentiated to form the Characato monzogranites. These monzogranites have crustal Nd and Srisotope signatures (εNdt −6.0 to −6.1 and 87Sr/86Srt 0.7074 to 0.7131) and abundant inherited zircons (ca. 90%). The inherited ages are mainly Early Cambrian, and to a lesser extent Mesoproterozoic, Neoproterozoic and Ordovician, all they recognized in the basement of the Sierras de Córdoba. The Nd-isotope composition, added to the inherited zircon ages of the Characato suite, indicate that these magmas derived from partial melting of a heterogeneous crust composed by the S-type Pampean granites and migmatites, Famatinian granitoids, and probably the low-to medium-grade metamorphic rocks of the Puncoviscan Series. The high variability and positive εHft values of the inherited Cambrian zircons found in the Characato suite could have been transferred from the Neoproterozoic grains of the Puncaviscana Series to the Early Cambrian S-type granites and migmatites during the Pampean orogeny.
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.
U–Pb SHRIMP zircon dating of Grenvillian metamorphism in Western Sierras Pampeanas (Argentina): Correlation with the Arequipa-Antofalla craton and constraints on the extent of the Precordillera Terrane
(Gondwana research, 2006) Casquet Martín, César; Pankhurst, R.J.; Fanning, C.M.; Baldo, Edgardo G.; Galindo Francisco, María Del Carmen; Rapela, Carlos W.; González Casado, José Manuel; Dahlquist, Juan A.
Metamorphism of Grenvillian age (ca. 1.2 Ga; U–Pb zircon dating) is recognized for the first time in the Western Sierras Pampeanas (Sierra de Maz). Conditions reached granulite facies (ca. 780 °C and ca. 780 MPa). Comparing geochronological and petrological characteristics with other outcrops of Mesoproterozoic basement, particularly in the northern and central Arequipa-Antofalla craton, we suggest that these regions were part of a single continental crustal block from Mesoproterozoic times, and thus autochthonous or parautochthonous to Gondwana.
Datación U-Pb SHRIMP de circones detríticos en paranfibolitas neoproterozoicas de las secuencia Difunta Correa (Sierras Pampeanas Occidentales, Argentina)
(Geogaceta, 2005) Rapela, Carlos W.; Pankhurst, R.J.; Casquet Martín, César; Fanning, C.M.; Galindo Francisco, María Del Carmen; Baldo, Edgardo G.
The Neoproterozoic Difunta Correa meta-sedimentary sequence (DCSS) of Western Sierras Pampeanas is a cover to a rejuvenated Grenvillian basement. The Western Sierras Pampeanas are allegedly part of the exotic Precordillera Terrane, which was accreted to the proto-Andean margin of Gondwana in lower Palaeozoic times. A para-amphibolite from this sedimentary sequence contains abundant zircons mostly consisting of detrital igneous cores with a metamorphic overgrowth. The latter formed at 439±34 Ma, i.e., during the Famatinian orogeny, although mantles are also found with mixed Grenvillian - Ordovician ages due to Pb-loss. Ages of igneous cores are ~ 625 Ma , 1050-1150 Ma and 1200-1500 Ma with a peak at c. 1.4 Ga. The ~ 625 Ma group zircon is of Gondwanan provenance and this age is an upper value for the age of the host amphibolite. An age between 580 Ma and 620 Ma is inferred for the DCSS. The provenance of zircons between 1.05 Ga and c. 1.2 Ga probably lies in the underlying Grenvillian basement. However zircons older than 1.2 Ga were derived from an unexposed area: palaeogeographical considerations suggest that this area could be either in Laurentia (trans-Laurentia belt) or in southern Amazonia (Rondonia- San Ignacio belt), both 1.3-1.5 Ga in age.
Dataciones Rb/Sr en el complejo plutónico Táliga Barcarrota (CPTB) (Badajoz)
(Geogaceta, 1990) Galindo Francisco, María Del Carmen; Portugal Ferreira, Martín R.; Casquet Martín, César; Priem, H.N.A.
The Plutonic Complex of Táliga-Barcarrota crops out in the core of the Olivenza-Monesterio anticline, where it intrudes the Upper Precambrian and Lower Cambrian metasediments. As this Complex is made of a) the Circular Pluton of Barcarrota, where the core is constituted by gabbros, diorites and pegmatoides and the outer rim shows quartz monzonites, quartz syenites and hypersolvus granites, and b) the NW-SE elongated Táliga Massif, almost entirely made of biotite orthogneisses, the sampling and the analyses were done in accordance with this double character of the Complex. Taking into account the K/Ar ages obtained on amphiboles, biotites and muscovites and the two Rb/Sr "isochrones" (whole rocks), it is concluded that 1) the Táliga Massif has an intrusion age of 525±2.5 M.A and a subsecuent pervasive recrystallization during the first hercynian phase, 385 ± 11 M.A, and 2) the Barcorrota Complex has an intrusion age of 505±5 M.A, as it is shown by the K/Ar and the Rb/Sr systematics. Also the Barcarrota Plutonic rocks have lower initial Sr87/Sr86 (O,7031±5X1O-6 than the Táliga orthogneisses (0.70836±9Xl0-5) pointing to a mantle versus. Crostal origin for both groups of magmas.
The Sierra Norte-Ambargasta batholith: Late Ediacarane-Early Cambrian magmatism associated with Pampean transpressional tectonics
(Journal of South American earth sciences, 2013) Iannizzotto, Noelia F.; Rapela, Carlos W.; Baldo, Edgardo G.; Galindo Francisco, María Del Carmen; Fanning, C.M.; Pankhurst, R.J.
The Sierra Norte-Ambargasta batholith is one of the largest plutonic expressions of the Pampean orogeny in western Argentina. A thorough petrographic, geochemical, isotopic (Sr and Nd) and geochronological (UePb SHRIMP) study is reported. The batholith comprises granitoid rocks that may be subdivided into those affected by Pampean D2 dextral shearing and mylonization and those emplaced after deformation had ceased; representative samples gave UePb zircon ages of 537 ±4 Ma and 530 ±4 Ma respectively. The earlier, dominant, groupwere derived largely frommetaluminous calc-alkaline subduction-related magmas, whereas the late granites are peraluminous. However, all have relatively high initial 87Sr/86Sr ratios (0.706 to at least 0.710, strongly negative εNdt values (-1.7 to -5.9) and, in some cases inherited 600 Ma and 970 Ma zircon, similar to the isotopic and zircon provenance seen in the metamorphic host rocks. A high degree of contamination of the magmas, possibly anatexis in the case of the post-mylonite granite, is related to emplacement during the latestage transpressional docking of the Pampean terrane against the Rio de la Plata craton. The absence of detrital zircon derived from the craton in either the Pampean metasedimentary host rocks or the batholith supports this collisional model for the Pampean orogen.
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.