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December 1975 - March 2016
January 2012 - present
Education
January 1978 - December 1985
February 1973 - December 1977
March 1969 - December 1972
Publications
Publications (400)
The Lower Cretaceous Neuquén Basin is characterized by an almost complete stratigraphic record with marine and continental successions that have been addressed from the perspective of compositional and provenance analysis. However, determination of source areas through geological time is still a matter of debate. This work focuses in the upper Vala...
The mechanisms responsible for determining whether a magmatic system will generate a bimodal or monotonous intermediate volcanic suite are still widely debated in igneous petrology. Thus, the compositional characteristics of volcanic suites represent the ultimate reflection of their magmatic evolution and provide crucial insights into their remote...
The Permian-Triassic magmatism of western Argentina and Chile represents one of the most outstanding silicic magmatic events of the southwestern Gondwana margin, notably marked by the development of the Choiyoi Magmatic Province (CMP). We provide a comprehensive review of its volcanic and plutonic record in the Argentine Frontal Cordillera. The vol...
This work delves into the intricate Paleoproterozoic geological setting of Uruguay, focusing on the Rio de la Plata Craton (RPC) and its prominent constituent Piedra Alta Terrane (PAT). The PAT constitutes the core of the RPC, characterized as a complex geological entity that encompasses a granite-migmatite basement, metamorphic belts, granite intr...
Cordilleran Granitic batholiths or Andean/Cordilleran batholiths serve as plutonic expressions of continental
arcs, offering valuable insights into the processes that operate in large silicic magmatic systems at subduction
environments. This work presents a comprehensive geochronological study of the Carboniferous Tabaquito
batholith in the Frontal...
ABSTRACT
It is widely acknowledged that thermal models clearly demonstrate that crustal magma bodies should solidify rapidly upon emplacement. Small plutons can cool below the solidus in thousands of years, while even large plutons require hundreds of thousands of years, but not more than a million years. However, recent U-Pb zircon geochronologica...
The Kaoko Belt in northwestern Namibia formed during the assembly of Gondwana in the Neoproterozoic to Cambrian Pan-African orogenic cycle. The belt has a complex tectonic architecture, in which a variety of basement units and metasedimentary associations became juxtaposed along shear zones and experienced widespread intrusive magmatism, generally...
This work focuses on the sedimentary provenance of the Villavicencio Formation of the Mendoza Precordillera and integrates the information obtained with previous work on other coeval units of the Precordillera Central of San Juan province (Gualilán Group: Talacasto and Punta Negra formations) in western Argentina. Multiproxy provenance analyses are...
The aim of this study is to utilize X-ray fluorescence (XRF) and inductively coupled plasma mass
spectrometry (ICP- MS) techniques to determine the geochemical composition of major, minor
and trace-elements in chloritoid-kyanite- muscovite-schist from the Brusque Metamorphic
Complex, a metasedimentary domain of the Dom Feliciano Belt in southeas...
New geological, structural, microstructural, and K-Ar biotite and illite geochronological data of igneous-metamorphic rocks exposed in the Cuesta de Rahue Basement Inlier are presented to reconstruct the Late Palaeozoic to Mesozoic tectonometamorphic and magmatic history of northwestern Patagonia. This block comprises a medium-grade metasedimentary...
New whole-rock geochemical and detrital zircon U–Pb and Lu–Hf data of metasedimentary sequences of the Silvretta Nappe, Orobic Alps, Strona-Ceneri Zone, Gotthard Massif and Venediger Nappe are presented. These units seem to share a common early to middle Paleozoic geological record, which has alternatively been interpreted as the result of intrapla...
Previous geochronological data indicate a protracted Devonian magmatic activity developed in the Sierra de San Luis, Sierras Pampeanas of Argentina, with three major crystallization events: 393 ± 3, 384 ± 2, and 377 ± 2 Ma. Previous whole-rock Sm-Nd isotopes define two average distinctive εNdt values: -1.37 and -3.47, and they are consistent with n...
The Ediacaran Campo Alegre-Corupá Basin in South Brazil developed in two stages, the synorogenic passive rift (Basin Stage ∼605–590 Ma) and the post-collisional caldera volcano (Caldera Stage ∼583–577 Ma), respectively. Volcanic rocks from the Basin Stage show a bimodal compositional spectrum with dominant basalt and subordinate silicic rocks. The...
Argon geochronology of white mica has a good potential of recording recurrent dynamic recrystallization in
shear zones in the transition from ductile to brittle deformation, as temperature ranges for mineral crystallization
and isotopic closure of different grain-size fractions overlap between ca. 275–425 ◦C. This study presents over 40
K-Ar ages o...
La Fm. Sierra de Aguirre (FSA) conserva un importante registro de la actividad volcánicapost-colisional del Cinturón Dom Feliciano. Depósitos de caída relacionados conchimeneas volcánicas distales actuaron como el principal mecanismo para el relleno de lacuenca, mientras que los flujos piroclásticos y lavas se interpretan como registros deerupcione...
The Ediacaran Campo Alegre-Corupá Basin in South Brazil developed in two stages, the passive rift Basin Stage (~605-590 Ma) and the post-collisional Caldera Stage (~583-577 Ma), respectively. Volcanic rocks from the Basin Stage show a bimodal compositional spectrum, with dominant basalt and subordinate silicic rocks. The basaltic rocks are transiti...
During the Early Carboniferous, significant intracontinental magmatism was developed in the retro-arc region of the SW margin of Gondwana between ca. 27° and 31°S. This magmatism consisted of metaluminous to weakly peraluminous A-type granites, strongly peraluminous A-type granites (A- to S- hybrid granitoids) and, in a lesser extent, (sub-)volcani...
Some recent models challenge the position and extension of the assumed oceanic basins formed through the break-up of Rodinia, and the tectonic processes involved in the Gondwana assembly, making the investigation of the Early Neoproterozoic
record of great relevance. Within the South-American Atlantic margin, the Punta del Este Terrane (PET) of the...
Field, petrographic, geophysical, geochronological, elemental and isotopic data support the identification of distinct components of a Wilson cycle (rift-drift-subduction-collision-collapse) in the South Atlantic Brasiliano Orogenic System (Mantiqueira Province). The main lines of evidence are: 1) Tonian-Cryogenian ophiolite complexes; 2) Hundreds...
Abstract
New whole-rock geochemical and coupled U–Pb and Lu–Hf LA-ICP-MS zircon data of metasedimentary rocks of the Austroalpine,
South Alpine and Penninic basement domains are presented, to disentangle the pre-Variscan tectonic evolution
of the proto-Alps. The studied units seem to record distinct stages of protracted Late Ediacaran to Carbonifer...
Coupled U–Pb and Lu–Hf LA-ICP-MS detrital and igneous zircon data were obtained from metasedimentary sequences (Kaserer Formation, Schmirntal Quartzite, Seidlwinkel Formation, Bündnerschiefer Basin, Riffler Basin) of the western Tauern Window (Eastern Alps). Results show maximum deposition ages between the Late Permian and the Triassic, indicating...
IINTRODUCTION: In Uruguay, Neoproterozoic
basins related to the post-collisional stage of the
Dom Feliciano Belt have been studied in different
levels of detail. Several aspects like the timing of
opening and filling, the geometry and the source
areas, as well as the relationship with other
geological processes still remain controversial.
Between t...
INTRODUCTION: The Punta del Este Terrane is an enigmatic piece within the evolution of southwest Gondwana, and the ambiguities regarding its crustal signature allowed correlations of this block with adjacent and dissimilar domains. The Neoproterozoic pre-Ediacaran evolution of the terrane is marked by two main episodes: a large tonalitic-granodiori...
The Punta del Este Terrane is an enigmatic piece within the evolution of southwest Gondwana, and the ambiguities regarding its crustal signature allowed correlations of this block with adjacent and dissimilar domains. The Neoproterozoic pre-Ediacaran evolution of the terrane is marked by two main episodes: a large tonalitic-granodioritic Tonian mag...
In Uruguay, Neoproterozoic basins related to the post-collisional stage of the Dom Feliciano Belt have been studied in different levels of detail. Several aspects like the timing of opening and filling , the geometry and the source areas, as well as the relationship with other geological processes still remain controversial. Between them, the Sierr...
In the eastern North Patagonian Massif, the Marifil Volcanic Complex corresponds to an Early Jurassic magmatic event. In this study, we evaluate new geochronological and thermochronological data obtained from an ignimbrite of the complex. U–Pb zircon ages from the pumice fraction reveal a Concordia age of 184.4 ± 1.1 Ma. Conversely, U–Pb zircon age...
The amalgamation of southwestern Gondwana during the late Neoproterozoic Brasiliano/Pan-African orogenic cycle involved the tectonic interaction of the Congo, Kalahari and Rio de la Plata cratons, together with numerous smaller basement fragments scattered throughout South America. A comprehensive review of U-Pb and Lu-Hf spot analyses in zircon pr...
This work reports on the first identification of sapphirine-bearing ultrahigh-temperature (UHT) metamorphic rocks within the Borborema Province, in NE Brazil. The investigated UHT diatexites outcrop in the Arapiraca Complex, a high-grade Palaeoproterozoic block embedded within the Neoproterozoic metavolcano-sedimentary sequence of the Sergipano fol...
A widespread project database for Devonian–Carboniferous magmatism in the Sierras Pampeanas and Frontal Cordillera between 27° and 35°S (including petrological, geochemical, geochronological, and isotope data) is reviewed along with compiled data from the literature and some new results. Rather than the traditional tectonic interpretation of episod...
New whole-rock geochemical and coupled U–Pb and Lu–Hf LA-ICP-MS zircon data of metasedimentary rocks of the Austroalpine, South Alpine and Penninic basement domains are presented, to disentangle the pre-Variscan tectonic evolution of the proto-Alps. The studied units seem to record distinct stages of protracted Late Ediacaran to Carboniferous tecto...
The Pavas Block is an Archean/Paleoproterozoic inlier located in the central segment of Uruguay's Precambrian exposition. A new insight initiated due to the acquisition of airborne geophysical data and new U–Pb zircon dating. The correlation of Archean crustal inliers in the amalgamation of the South American Platform is one of the main objectives...
This database is a geological and geochronological compilation made to study a small Archean/Paleoproterozoic block located in the centre of the Precambrian rock exposition of Uruguay. Petrographic and field outcrops data supporting the samples from which the zircons for textural analysis and U-Pb dating (LA-ICP-MS) come are presented at first with...
Above subduction zones, magma production rate and crustal generation can increase by an order of magnitude during narrow time intervals known as magmatic flare-ups. However, the consequences of these events in the deep arc environment remain poorly understood. Here we use petrological and in-situ zircon dating techniques to investigate the root of...
This contribution deals first new ICP-MS U–Pb zircon ages that indicate Middle- and Late Triassic magmatic episode and tectonometamorphic events, respectively, for the central Patagonia region, instead of a Paleozoic history as previously estimated. The Calcatapul Formation consists of a (meta-) volcano-sedimentary syn-rift sequence deposited uncon...
New isotopic and geochemical data for the Paleo- Meso- and Neoproterozoic metasedimentary cover of the southern Dom Feliciano Belt (Brasiliano/Pan-African) are presented and evaluated combined with published information. Whole-rock major and trace element geochemistry indicates that the dominant source for all the units was the upper continental cr...
One of the main characteristics of the orogenic systems formed during the assembly of southwestern Gondwana in the Late Neoproterozoic is the widespread granitic magmatism. The Florianópolis Batholith in South Brazil is an excellent example of this process, as it is part of a ca. 1,400 km long intrusive association that is a key unit in the reconst...
During the last decades, tectonic models provided new insight into the evolution of the Luis Alves, Curitiba, and Paranaguá terranes, which are all limited by thrust and transpressive shear zones, nowadays outcropping only as deep crustal horizons and presenting poorly known lateral displacements. An essential puzzle piece to understanding the juxt...
The Luís Alves Terrane in southern Brazil is one of the largest expositions of the Archean to Paleoproterozoic
units that acted as basement for the development of the Neoproterozoic Pan-African/Brasiliano orogenic belts in
the Mantiqueira Province, in South America. Combined field observations, petrography, Hf and U-Pb LA-ICP-MS
zircon and titanite...
The Sierra de Aguirre Fm. in southern Uruguay constitutes one of several post-collisional basins of the Dom Feliciano Belt, preserving an important volcanic record associated with this protracted stage of the orogenic system. This study combines new stratigraphic, structural, geochronological and isotopic geochemical results, together with a reasse...
Whereas north of 33°S Devonian calcalkaline magmatism is notably absent, a Devonian arc is well developed to the south of 33°S. The Carrizalito, Pampa de los Avestruces, and Papagayos plutons are located in the Frontal Cordillera between 34° and 35°S. U-Pb zircon SHRIMP and LA-MC-ICP-MS data from the plutons yield Early Devonian ages of 389 ± 3 and...
The temporal and spatial relationships between polyphase folding and faulting, regional metamorphism, and granitoids intrusions are discussed for the low-grade basement rocks of the El Jagüelito Formation from the eastern North Patagonian Massif, Argentina, at the inferred western Gondwana margin. As a result of the tectonometamorphic and magmatic...
The Characato suite (Achala batholith, Sierras Pampeanas, Argentina), consists of at least six granitic facies with affinities of F-rich moderately to strongly peraluminous A-type granites. The two more extensive facies (Facies 1 and 2) and a minor one (Facies 5) would represent at least three batches of magma generated by partial melting from the...
The Ancaján pluton is a small-scale (ca. 5.34 km2) elongated igneous body of granodiorite to monzogranite composition that crops out in the Sierra the Ancaján (Eastern Sierras Pampeanas), intruding marbles and metasedimentary rocks of the Ediacaran Ancaján series. New SHRIMP and LA-MC-ICP-MS U–Pb zircon analyses from one granodiorite sample yielded...
The Tunas Formation crops out in the eastern sector of the Ventania System (southwestern Buenos Aires Province, Argentina) and represents the last unit of the Pillahuinc´o Group (Pennsylvanian–Cisuralian). This work integrates sedimentological, palaeontological, geochemical, and geochronological studies of the uppermost levels of the unit with the...
Argon geochronology of white mica has a good potential of recording recurrent dynamic recrystallization in shear zones in the transition from ductile to brittle deformation, as temperature ranges for mineral crystallization and isotopic closure of different grain-size fractions overlap between ca. 275–425 °C. This study presents over 40 K-Ar ages o...
Workshop Geology of the SW Amazonian Craton: State-of-Art. Institute of Geosciences, University of São Paulo, 2001.
The Late Paleozoic Ice Age (LPIA) has been well recorded in the uppermost Mississippian–Pennsylvanian of Gondwana. Nevertheless, little is known about the temporal and geographic dynamics, particularly during the early Mississippian. We report on exceptional Tournaisian glaciomarine stratigraphic sections from central Argentina (Río Blanco Basin)....
The Neoproterozoic Anti-Atlas belt (Morocco) is a key segment in tracing the history of the northern margin of the West African craton (WAC) from Rodinia breakup to Gondwana assembly. In order to constrain geodynamic events related to rifting and convergence and their stratigraphic records, a radiometric study was carried out on the volcano-sedimen...
El papel de la configuración geodinámica durante las etapas finales de amalgamación del Gondwana occidental en el estilo euptivo, edad de ocurrencia y en la evolución química de las rocas volcánicas peralcalinas de la Cuenca de Campo Alegre, Brasil-Parte 2
We report new whole-rock Nd and Sr isotope data for two strongly peraluminous and one slightly peraluminous Carboniferous A-type granitic plutons in the eastern Sierras Pampeanas of Argentina. Our study also integrates previous petrological and geochemical information with in situ U–Pb and Hf isotope data from magmatic and inherited zircon. Strongl...
The Tabaquito batholith (Frontal Cordillera, western Argentina), is mainly composed of shallowly emplaced granodiorite to minor monzogranite with abundant mafic microgranular enclaves. New SHRIMP U–Pb zircon ages of ∼337 Ma (biotite granodiorite) and ∼284 Ma (mafic dyke) along with previously published geochronological data suggest a long-lived mag...
New structural data from a mid-crustal segment in the Eastern Sierras Pampeanas, coupled with geochronological methods and P – T estimates, reveal polyphase contractional deformation and metamorphism during the Famatinian Orogeny over a long period of time. Peaks of metamorphic monazite and zircon ages are recorded at c. 500 Ma, between 484 and 465...
The southeastern coast of South America is an example of the complexity of passive continental margins, as it displays both high- and low-elevation segments despite sharing a similar pre-rift geological history and structural configuration. As such, it is a prime candidate for investigating debated questions concerning the evolution of passive marg...
This study describes the geology, geochemistry, and LA-ICP-MS U–Pb geochronology of igneous rocks that crop out in the Sauce Chico Inlier (SCI) and constitute the Neoproterozoic basement of the Ventania System, Argentina. Magmatism registered in the SCI has developed in two phases. The first phase, of Tonian age, is represented by rift-related calc...
The Mantiqueira Province (MP) is the major tectonic unit of southern Brazil, resulting from the closure of the Adamastor Ocean during Gondwana assembly. The Ribeira Belt (RB), the largest domain of the MP, has developed in several episodes of convergence during the Brasiliano-Pananafricano Orogeny and is subdivided into several terranes. One of the...
The Las Chacras-Potrerillos together with the Renca batholith (Sierras de San Luis) are the largest Devonian igneous bodies in the Sierras Pampeanas after the Achala batholith (Sierra de Córdoba), all emplaced in the Devonian foreland region. The Achala batholith has U–Pb ages (SHRIMP or LA-MC-ICP-MS, ranging from 366 to 379 Ma), while comparable a...
The Campo Alegre Basin is a volcano-sedimentary sequence covering an area of about 500 km 2, located at the northeast portion of Santa Catarina state (Brazil), and formed during the late stages of the Neoproterozoic era. Three main stratigraphic units compose this basin, the lowermost of which is the Bateias Formation, corresponding to the pre-volc...
New geochronological, isotopic and geochemical data were obtained from the late Paleoproterozoic and Mesoproterozoic magmatic units of the Nico Pérez Terrane (Uruguay). A U-Pb LA-ICP-MS zircon age of 1768 ± 11 Ma confirms the Statherian age for the Illescas rapakivi intrusion, being thus comparable with the age of the Campanero Unit felsic orthogne...
Caracterização geométrica e cinemática da Zona De Cisalhamento Major Gercino e sua importância na compartimentação dos terrenos Pré-cambrianos de Santa Catarina
Ash fall layers and vitroclastic-carrying sediments distributed throughout the entire Permian stratigraphic range of the Paraná Basin (Brazil and Uruguay) occur in the Tubarão Supergroup (Rio Bonito Formation) and the Passa Dois Group (Irati, Estrada Nova/Teresina, Corumbataí, and Rio do Rasto Formations), which constitute the Gondwana 1 Superseque...
New zircon and apatite (U‐Th)/He data (AHe and ZHe) from the crystalline basement of the South American passive margin in southern Brazil present a wide distribution of Phanerozoic apparent ages, recording its pre‐rift evolution. Its geological significance can be investigated by modeling the influence of the accumulated radiation damages on the me...
Along the proto-Pacific margin of Gondwana, from Venezuela to northeastern Patagonia, the Early–Middle Ordovician Famatinian orogeny was the first orogenic event following assembly of the supercontinent. Previous isotope studies of the igneous and (meta-)sedimentary rocks of southwestern Gondwana yield ambiguous implications for the role of juvenil...
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 p...
The Veladero hill is a well-exposed upper crustal block located between the basement of Sierra de Umango (Western Sierras Pampeanas), and the Devonian - Carboniferous sedimentary sequence of Precordillera, at western Argentina. The hill is formed by schists, metaluminous granitoids and a subalkaline peraluminous andesite studied in this work. The c...
The Paraná Basin represents an important sedimentation episode that occurred in the south margin of Gondwana during the Paleozoic and Mesozoic. The evolution of the basin extended mainly from the Ordovician to the Lower Cretaceous, with the continental break-up and the formation of the rift that originated the South Atlantic Ocean. The stratigraphy...
This study describes the stratigraphic features, petrology and geochemistry and geochronology constraints of K-bentonites, ignimbrites and related volcanogenic rocks interbedded in the marine sedimentary sequence of the El Jagüelito Formation from northern Patagonia basement, southwestern Gondwana margin (41°33′S-65°15′W, South America). Six SHRIMP...
The Cerro Chato region is located in southernmost Brazil and is characterized by associations of acid volcanic and subvolcanic rocks. The region is affected by NW and NE‐ trending faults and is grouped into 2 geomorphologically distinct features: Cerro Chato and Cerro Partido. Cerro Chato is represented by ignimbrites that occur in 2 main facies: l...
We report a study integrating 13 new U–Pb LA-MC-ICP-MS zircon ages and Hf-isotope data from dated magmatic zircons together with complete petrological and whole-rock geochemistry data for the dated granitic rocks. Sample selection was strongly based on knowledge reported in previous investigations. Latest Devonian–Early Carboniferous granite sample...
The Late Precambrian–Early Palaeozoic crystalline basement of the Ventania System is mainly composed of Neoproterozoic S-type granites, Early Cambrian alkaline granites, and Middle Cambrian peralkaline rhyolites. The Neoproterozoic granites (ca. 607–581 Ma) crop out in the Cerro Pan de Azúcar-Cerro del Corral area and host the Loma Marcelo Ca/Mg sk...
It is presented here the first U-Pb geochronological data on zircons from the volcanic event which has covered the vegetated areas of the Paramillo Formation at the NE Uspallata region. This regional extended event preserved a fossiliferous record of relevance for the Triassic in SW Gondwana. A total of 57 zircons were analyzed by the U-Pb methodol...
Detrital zircon U-Pb (LA-ICP-MS) ages from the type section of the Neopaleozoic Cerro Agua Negra Formation are here presented. The sedimentary sequence was studied by several authors, and it comprises basal glacial-related deposits followed by arenites deposited by low-density turbidite currents and fine-grained pelites and greywackes bearing brach...
