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April 2009 - March 2014
Publications
Publications (37)
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...
Carboniferous plutonic activity in the Sierra Pampeanas region of NW Argentina resulted in the emplacement of several magma bodies at shallow levels, while contemporaneous volcanism was primarily recorded in the neighboring Puna region. One of these plutons, known as Los Árboles in the Sierra de Fiambalá, formed through two periods of significant f...
Clay mineral characterization is a valuable tool for unraveling the evolution of continental sedimentary basins. The Fiambalá basin is a foreland Andean basin located in the Southwest of the province of Catamarca (Argentina), on the flat subduction segment. In order to characterize its paleoenvironment and post-depositional evolution, petrographic,...
We clarify some statements on our works included by Bahlburg (2021), which we think are confusing and misleading. Clarification is highly necessary to interpreting the evolution of the Devonian proto-Andean margin of Argentina and Chile, and in this work, we show that this clarification is appropriated and should be considered.
The Lower Carboniferous Guandacolinos pluton of northwestern Argentina (Western Sierras Pampeanas) preserves field, structural, and petrological evidence of sheet-like transport and assembly of granitic magmas in the upper crust. The pluton is a relatively small (~24 km2) subduction-related granitic body, elongated in map view, and hosted in Neopro...
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...
South American titanosaurians have been central to the study of the evolution of Cretaceous sauropod dinosaurs. Despite their remarkable diversity, the fragmentary condition of several taxa and the scarcity of records outside Patagonia and southwestern Brazil have hindered the study of continental-scale paleobiogeographic relationships. We describe...
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...
Detailed mapping of the Huaco intrusive Complex in NW Argentina documents a shift in the emplacement style of successive magma additions in an upper crustal environment as the system evolves thermally. The units of the Huaco intrusive complex exhibit a change from a tabular to funnel-shaped subhorizontal body (Huaco unit) with stoping and brittle f...
Este libro contiene los resúmenes de trabajos presentados en la XVII Reunión de Tectónica, llevada a cabo en la ciudad de La Rioja, Argentina, entre los días 3 y 5 de septiembre de 2018. Estudiantes y profesionales de Ciencias de La Tierra presentan y discuten los avances científicos originales alcanzados o en desarrollo sobre temáticas relacionada...
The Asha pluton, the oldest unit of the San Blas intrusive complex (Early Carboniferous), exhibits impressive examples of magmatic structures formed by accumulation of K-feldspar megacrysts, enclaves, and schlieren. Almost all recognized structures are meter-scale, vertically elongate bodies of variable shapes defined as fingers, trails, drips, and...
We describe tetrapod burrows from the uppermost Middle-lower Upper Triassic (latest Ladinian-early Carnian) Chañares Formation (Ischigualasto-Villa Unión Basin), La Rioja Province, northwestern Argentina. The burrows were found in different localities of the unit, but restricted to the lowermost 17 m of the formation. They occur at the same interva...
The Triassic period documents the origin and diversification of modern amniote lineages and the Late Triassic fossil record of
South America has been crucial to shed light on these early evolutionary histories. However, the faunistic changes that led to
the establishment of Late Triassic ecosystems are largely ignored because of the global scarcity...
Carboniferous igneous activity in the Sierra de Velasco (NW Argentina) led to the emplacement of several magmas bodies at shallow levels (< 2 kbar). One of these, the San Blas intrusive complex formed over millions of years (≤ 2-3 m.y.) through three periods of magma additions that are characterized by variations in magma sources and emplacement st...
The Middle-Upper Triassic deposits of the Calingasta-Barreal valley, northern expression of the Cuyo Basin of western Argentina, contain the register of rift- related basic and silicic volcanism. Basic rocks are basalts and consist in two lava flow units characterized by flow foliations, columnar jointing and vesicles at the top. Silicic rocks are...
The Middle-Upper Triassic deposits of the Calingasta-Barreal valley, northern expression of the Cuyo Basin of western Argentina, contain the register of rift- related basic and silicic volcanism. The petrology of these rocks, particularly the silicic members, has been poorly documented as well as their relationships with previous magmatic events. B...
In the flat slab region of the South Central Andes (∼31–32 • S), geological observations suggest that the regional crustal structure is inherited from the accretion of different terranes during the Ordovician. These structures were later reactivated, first in extension during the Triassic and later in compression during the Andean uplift since the...
The southern portion of the Cordillera Frontal of San Juan (western Argentina) comprises some of the best exposures of the Choiyoi Group, the eruptive counterpart of a large silicic plutono-volcanic province of Permian-Triassic age developed on the southwestern margin of Gondwana. Stratigraphic, petrologic, and geochronologic studies allowed to rec...
The southern portion of the Cordillera Frontal of San Juan (western Argentina) comprises some of the best exposures of the Choiyoi Group, the eruptive counterpart of a large silicic plutono-volcanic province of Permian-Triassic age developed on the southwestern margin of Gondwana. Stratigraphic, petrologic, and geochronologic studies allowed to rec...
New mapping and a detailed structural study of the La Chinchilla stock, Sierra de Velasco, NW Argentina, suggest an asymmetrical shape of the pluton and provide strong evidence for its shallow emplacement depth. The pluton is a Lower Carboniferous monzogranite composed of K-feldspar, quartz, plagioclase and biotite. It exhibits an internal asymmetr...
La porción sur de la Cordillera Frontal de San Juan comprende algunas de las mejores exposiciones del Grupo Choiyoi, la contraparte eruptiva de una gran provincia plutono-volcánica silícica de edad pérmico-triásica desarrollada sobre el margen sudoccidental de Gondwana. Estudios estratigráficos, petrológicos y geocronológicos permitieron reconocer...
The Permo-Triassic Choiyoi rhyolite province of Chile and Argentina is by its extension, volume and geological significance, the record of one of the most important magmatic events of the southwestern margin of Gondwana. However, aspects dealing with the physical volcanology and tectonic setting are poorly understood. In order to characterize the e...
This paper deals with the study of pyroclastic facies associated to interbedded clastic rocks and mesosilicic volcanic igneous rocks cropping out in the Frontal Cordillera, on both margins of the Calingasta River, in the San Juan Province of Argentina. These rocks are ascribed to the Choyoi Group, a volcanic, pyroclastic and clastic complex, assign...
This paper deals with the study of pyroclastic facies associated to interbedded clastic rocks and mesosilicic volcanic igneous rocks cropping out in the Frontal Cordillera, on both margins of the Calingasta River, in the San Juan Province of Argentina. These rocks are ascribed to the Choyoi Group, a volcanic, pyroclastic and clastic complex, assign...
