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Introduction
He earned his PhD in Geological Sciences at the National University of Córdoba (Argentina) in 1972. He has worked at the Argentinean Geological Survey, mapping the Neuquén Basin. He was President of the Argentinean Geological and Paleontological Associations, fellow of the Alexander von Humbolt and the Guggenheim Foundations, and member of the National Academy of Sciences. He is currently working at the Buenos Aires Natural History Museum as member of the Argentinean Research Council (CONICET).
Current institution
Current position
- Investigador Superior, CONICET
Additional affiliations
January 1994 - present
June 1970 - September 2012
Publications
Publications (255)
ABSTRACT. Mesozoic stratigraphy in the Fortín 1º de Mayo region, souhtwestern Neuquén Basin, Argentina.- The oldest units recognized in the Fortín 1° de Mayo area are the low-grade metamorphic rocks of the Piedra Santa Formation, and the vulcanitic rocks of the Choiyoi Formation. As a result of extensional processes, in the Upper Triassic began the...
Mesozoic stratigraphy in the Fortín 1º de Mayo region, souhtwestern Neuquén Basin, Argentina.-
The oldest units recognized in the Fortín 1° de Mayo area are the low-grade metamorphic rocks of the Piedra Santa
Formation, and the vulcanitic rocks of the Choiyoi Formation. As a result of extensional processes, in the Upper
Triassic began the sedimenta...
The present-day “Andean” configuration of the Neuquén Basin has been classically used in most paleogeographic reconstructions of the existing literature as a consequence of the compressive deformation episode of the Andean orogeny, which resulted in a foreland stage initiated during the Late Cretaceous. The configuration displays its classic struct...
The Vaca Muerta Formation belongs to a retro-arc setting, with a fast flooding episode at its very base probably favored by an underfilled depocenter and uplifted peripheral zones, in which the oceanic water penetrated through sudden ruptures along the incipient Andean arc as a consequence of the Late Jurassic inversion. The Vaca Muerta Formation f...
The Late Jurassic-Early Cretaceous Vaca Muerta Formation deposited in the Neuquén Basin has an exceptional development, in the thickness of its sequences and in the volume of its sedimentation. These marine deposits, which constituted the source rock of conventional oil and gas for almost more than a century, continue to be an important source of u...
Igneous sills and laccoliths emplaced in sedimentary basins may significantly impact petroleum systems, both positively and negatively. Igneous intrusions provide heat to maturate regionally immature organic-rich host rocks, act as fractured reservoirs hosting commercial accumulations of hydrocarbons, and form structures affecting fluid flow and tr...
The upper portion of the Cuyo Group in the Zapala region, south‐eastern Neuquén Basin (Western Argentina), encompasses marine and transitional deposits (Lajas Formation) overlain by alluvial rocks (Challacó Formation). The Challacó Formation is covered by the Mendoza Group above a second‐order sequence boundary. The present study presents the strat...
In this article a complete review of the life and work of the outstanding geologist Eduardo J. Llambias (1937-2018) is offered.
Nota Necrológica de Eduardo J. Llambías
Megatrigoniine bivalves are the rootstock of a major trigoniid radiation in the Late Jurassic and Early Cretaceous. They appeared first in the Middle Bajocian of the Andean Province and are predominantly Gondwanic in distribution. Their centre of radiation and dispersal was the Andean Province, from where they spread into the American Province in t...
Maduración de las Formaciones Vaca Muerta y Agrio ocasionado por el emplazamiento de un complejo intrusivo magmático en el sector sur mendocino de la Cuenca Neuquina RESUMEN La existencia de complejos intrusivos en cuencas sedimentarias ha sido documentada en varias cuencas en distintas partes del mundo. Generalmente se emplazan en rocas ricas en m...
DOI: 10.1016/j.jsames.2018.05.010
A cyclostratigraphic and paleomagnetic study was carried out in the lower part of the Vaca Muerta Formation, Los Catutos Member (Lower to lowermost Upper Tithonian) at the southern region of the Sierra de la Vaca Muerta, Neuquén Basin, west-central Argentina. The Vaca Muerta Formation is known for its unconventiona...
Numerous sedimentary basins in the world host voluminous igneous sill-complexes, i.e. stacking of sills that are emplaced in different levels of the sedimentary sequence. When sills are emplaced in organic-rich sedimentary formations, they can considerably affect the thermal and maturation history of the hydrocarbon source rock and can be highly re...
The existence of intrusive-complexes in sedimentary basins has been documented in many basins all around the world. Generally, they are emplaced in organic rich rocks, producing their maturation. Also, the emplacement can generate fluid's migration conduits, structures that can be hydrocarbon traps, and fractured reservoirs. This paper will focus o...
Maduración de las Formaciones Vaca Muerta y Agrio ocasionado por el emplazamiento de un complejo intrusivo magmático en el sector sur mendocino de la Cuenca Neuquina RESUMEN La existencia de complejos intrusivos en cuencas sedimentarias ha sido documentada en varias cuencas en distintas partes del mundo. Generalmente se emplazan en rocas ricas en m...
The trigoniid group "Pseudo-Quadratae" was introduced for Cretaceous descendents of Myophorellidae with a convergent resemblance to Tethyan Quadratotrigoniinae (= Quadratae). Subsequently it was made the basis of the subfamily Steinmanellinae, which herein is elevated to family rank. The earliest record of the group is from the Early-Middle Kimmeri...
During the 20º Argentine Geological Congress celebrated at the San Miguel de Tucuman city (7-11 August, 2017) the Symposium 5: Geología de la Formación Vaca Muerta (Geology of the Vaca Muerta Formation) took place with great success. The results of this Symposium were published in the Congress’s Actas, which is here uploaded. The Symposium contains...
Regional seismic cross section of the Vaca Muerta - Quintuco System: Siesmic facies interpretation based on acoustic impedance and dominant lithofacies. The objetive of this study is to prensent a seismic facies interpretation of the Vaca Muerta - Quintuco depositional system, and relate them to lithofacies assiciations. For this, acoustic impedanc...
Tectono - sedimentary evolution of the Vaca Muerta - Quintuco System (Tithonian to Lower Valanginian) at the Neuquén Embayment, Argentina. This contribution presents a tectono-sedimentary evolution scheme for the region of the Neuquén Embayment during the Tithonian to Lower Valanginian. This scheme was developed based on reference surfaces mapped i...
Regional seismic cross section of the Vaca Muerta - Quintuco System: Seismic facies interpretation based on acoustic impedance and dominant lithofacies. The objetive of this study is to prensent a seismic facies interpretation of the Vaca Muerta - Quintuco depositional system, and relate them to lithofacies associations. For this, acoustic impedanc...
Evidence of brittle deformationduring emplacement of a laccolith: the cerro Bayo of Chachauén case study, southern Mendoza, Argentina. Laccoliths are dome- shaped igneous intrusions that grow from the inflation of sills, which are emplaced at shallow depths in the upper crust. During the inflation process, stresses are concentrated on the sill tips...
Modelling of petrolueum systems associated with igneous intrusions on organic rich shales: the case of the Vaca Muerta and Agrio formatios in southern Mendoza, Argentina. The last decade of research has evidenced the presence of voluminous intrusives, dominantly sills and laccolith, and extrusive magmatic complexes in many basins worldwide. These i...
Seismic reflection data and field observations have revealed the presence of voluminous igneous sill complexes emplaced into organic-rich shale formations in sedimentary basins worldwide. Damage and structures associated with sills have large implications for fluid flow through basins. Constraining the distribution of these structures requires a go...
Five years after the first oil produced from a well targeting the Vaca Muerta Fm as an unconventional shale reservoir, more than 60 exploration wells from black oil to dry gas have tested its potential, and moved the play into production. A unique fact to the Neuquén Basin is that it is almost completely covered by fairly good resolution 3D seismic...
The extensive outcrops of the Late Jurassic-Early Cretaceous Vaca Muerta Formation black shales and marls in the Neuquén Basin have yielded very few bivalves, and these are not well-known. The material described here was collected in central Neuquén, from late Tithonian calcareous levels within the black shales, between beds with Substeueroceras sp...
Strike-slip faults are commonly assumed to influence magma
transport and emplacement in the Earth’s crust. However,
direct observations of magma conduits within strike-slip faults
are lacking. Here we provide some of the first detailed field
observations of dykes emplaced within strike-slip faults in the
Neuquén Basin, Argentina. We show how fault...
Five years after the first oil produced from a well targeting the Vaca Muerta Fm as an unconventional shale reservoir, more than 60 exploration wells from black oil to dry gas have tested its potential, and moved the project into production. An unique remarkable fact to the Neuquén Basin is that it is almost completely covered by fairly good resolu...
Magma ascent and emplacement in compressional tectonic settings remain poorly understood. Geophysical studies show that volcanic plumbing systems in compressional environments are vertically partitioned into a deep level subject to regional compression and a shallow level subject to local extension. Such vertical partitioning has also been document...
Magma ascent and emplacement in compressional tectonic settings remain poorly understood. Geophysical studies show that volcanic plumbing systems in compressional environments are vertically partitioned into a deep level subject to regional compression and a shallow level subject to local extension. Such vertical partitioning has also been document...
Seismic reflection data and field observations have over the past few decades revealed the presence of voluminous igneous sill complexes in sedimentary basins worldwide. The implications of sill emplacement in sedimentary basins are numerous: they trigger maturation of organic-rich formations, they produce large quantities of greenhouse gases that...
The first informal description of what actually is known as the Vaca Muerta Formation was due to Bodenbender (1892), who described in the Salado river valley in southern Mendoza, highly bituminous shales, with fluid oil in nucleus of ammonites. Early studies carried out by German paleontologists based on Bodenbender´s collections, namely Beherendse...
In contrast to the classical concept of magma ascent in extensional
settings, recent studies show that volcanism also occurs in
compressional settings. The nature of the interplay between magmatism
and tectonics in fold-and-thrust belts however, remains a major
question, notably in active margins. The mechanisms of magma transport
in such settings...
ABSTRACT
This paper is about an almost uninterrupted exposure of the Jurassic Los Molles Formation in the Arroyo La Jardinera region in the southern Neuquén Basin (western Argentina). It is based on the analysis of a high-resolution satellite images linked with extensive field data. Its main goal is to present a conceptual model for the studied tur...
La identificación y estudio de una mineralización tipo Banded Iron Formation (BIF) en el sector septentrional de la Cordillera del Viento, al norte de los 37° latitud sur y entre 70°30' y 70°40' de longitud oeste permitió definir y mapear la Formación Colomichicó (Zappettini y Dalponte, 2009) con la cual se vincula genéticamente. Originalmente, la...
En el presente trabajo se da a conocer la existencia de seis niveles fosfáticos (NF) del Cretácico Inferior en el área del cerro Salado (38º12'07,8"S., 70º02'06,6"O.), y se analiza su posible vinculación con las oscilaciones eustáticas en aquél período. El cerro Salado se encuentra ubicado en el sector centro-sur de la cuenca Neuquina (figura 1). D...
The Vaca Muerta Formation (Late Jurassic-Early Cretaceous) in the Neuquén Basin.- The analyzed stratigraphic interval is encompassed
between the contact between the Tordillo and the Vaca Muerta Fms. and the Intravalanginian unconformity, ranging in age from
the late Early Tithonian to the Early Valanginian. The lower part, which coincides with the...
La historia del conocimiento geológico del Neuquén
es compleja, multifacética y longeva, dado que acumula
una gran cantidad de estudios tanto sobre aspectos
científicos, como aplicados, en especial a la exploración y
evaluación de sus recursos petroleros. Esto lo habíamos
ya percibido en Rolleri et al. (1978), en un primer intento de
establecer una...
Tectosedimentary context.- The Neuquén Basin is a subandean depocenter located in southern South América with almost 7.000 m of Jurassic and Cretáceous sediments. Its depositional history is a cyclical succesion of marine incursions alternating with continental episodes. During Upper Cretaceous the rising of the Andes Chain started, and the definit...
RESUMEN En el agrupamiento volcánico Tromen-Tilhue en el macizo del Tromen, se han reconocido dos tipos de volcanismo cuaternario con composiciones contrastadas: un volcanismo riolítico y otro andesítico. El riolítico está compuesto por domos, lavas y depósitos piroclásticos, con una edad comprendida entre 2,3 y 0,8 Ma. Sus rocas se caracterizan po...
RESUMEN: Las exposiciones más septentrionales del basamento ígneo metamórfico de la provincia del Neuquén se desarrollan en la comarca de Varvarco, pero los afloramientos mayores se reconocen entre la latitud del paso de Pino Hachado y el límite con la provincia de Río Negro. El 'basamento' ha recibido diversas denominaciones como Fm. Colohuincul,...
Jurassic megainvertebrates and their geobiologic significance.- The Neuquén province is a key area for the study of the Argentine
Mesozoic record, in particular the marine Jurassic fossiliferous deposits. The successive changes in sea level, sedimentary input and
continental shelf extent generated a variety of environments and usually contributed t...
The La Amarga and Lohan Cura formations (Early Cretaceous) in the Picún Leufú depocentre.-The continental Early Cretaceous beds cropping out in the southern part of the Neuquén Basin (Picún Leufú Depocentre) comprised between the Mendoza and Neuquén Groups, are analyzed in this paper. Taking into account these stratigraphic relationships, they are...
RESUMEN Donde la Cordillera incide en Cuenca Neuquina, afloran centenares de vetas de hidrocarburo sólido (asfaltita). Muchas han sido objetos de trabajos mineros. De común acuerdo, la asfaltita es producto de maduración de lutitas, ricas en materia orgánica, en particular de la Fm. Vaca Muerta, de edad Jurásica tardía. En la provincia del Neuquén,...
RESUMEN Los recursos de minerales y rocas industriales de la provincia del Neuquén están íntimamente ligados a importantes unidades sedimentarias de interés económico. A estas formaciones geológicas, principalmente mesozoicas, se asocian depósitos de calizas, dolomías, arcillas, bentonitas, baritina y celestina, sal de roca y sales de potasio, yeso...
RESUMEN Los Sitios de Interés Geológico son áreas que muestran una o varias características consideradas de importancia en el desarrollo de la historia geológica de una comarca. Su conocimiento aporta información que permite reconocer e interpretar la evolución de los procesos geológicos que, como resultado, han modelado nuestro planeta a lo largo...
In this book, published under the auspices of the 18º Argentine Geological Congress and the Argentine Geological Association celebrated in 2011 in the city of Neuquén, the geological knowledge of the Neuquén province is updated, after 33 years of holding the 7º Argentine Geological Congress in the same city in 1978. The book contains 912 full color...
The Upper Hauterivian to Lower Barremian Agua de la Mula Member of the Agrio Formation (Neuquén Basin, Argentina) was studied applying an integrated stratigraphic approach and facies analysis. the ammonite biostratigraphy of the member has been improved based on bed-by-bed collecting. the already defined biozones (Spitidiscus riccardii, Crioceratit...
The relationship between Lower Cretaceous (Berriasian to Lower Valanginian) phosphate levels (PLs) and eustatic oscillations are analyzed in the area of Cerro Salado (38º12'07.8 " S, 70º02'06.6 " W), located in the central part of the Neuquén Basin. About 270 m of fine sandstones, shales and limestones, preliminary assigned to three formational uni...
New data from a Lower Jurassic shale section in the Neuquén Basin, Argentina, are presented in order to better constrain the triggering mechanism for the Toarcian Oceanic Anoxic Event (TOAE) and the associated negative carbon isotope excursion. Chemostratigraphy from a 65m thick shale-dominated marine section of Late Pliensbachian to Early Toarcian...
Los fosfatos de las formaciones Vaca Muerta y Quintuco en el área del cerro Salado, provincia del Neuquén, corresponden a depósitos residuales (lags) conformados por restos fosfáticos pesados (nódulos, pellets y/o coprolitos) y fragmentos de huesos y conchillas. Estos integran wackestones, areniscas calcáreas y coquinas (grainstones) acumulados en...
This paper contains the taxonomic and biostratigraphic analysis of a new Tithonian ammonite fauna from the Neuquén Basin, Argentina. Most of the ammonites have been collected by the authors bed by bed in the lithographic limestone quarries of the Los Catutos region in the vicinity of Zapala city. Some additional material from Cerro Caicayén and Cer...
Loncopué 1
ABSTRACT
The geological sheet 3972-II, Loncopué, is
located in the western central part of the Neuquén
Province, embracing the southern part of the Cordillera
Principal (Cordillera Neuquina), the northern
extremity of the Cordillera Patagónica Septentrional
and the southwestern part of the Neuquén
Basin.
The oldest unit exposed consists...
The main unconformities of the Mesozoic of the Neuquén Basin based on surface observations.- A general summary of the main unconformities which produced major order break-ups during the evolution of the Mesozoic sedimentary infill of the Neuquén Basin is offered in this paper. Based on its hierarchy, they are categorized in three groups, as follows...
The finding of an important marine invertebrate fauna of Upper Tithonian age at the shoulders of the Penitentes hill, in the basal carbonatic sequence of the first Andean wedge confirms the tectonic logic of a detachment of this unit at the level of the Yeso Principal. This allows invalidating certain lithostratigraphic correlations and paleogeogra...
Finding of Neogene synorogenic sedimentites around Chos Malal, Neuquén Basin, Argentina.
The Chos Malal Formation nov. is proposed to group a 140,50 m thick neogene succession of epiclastic
sedimentites including sandstones, silstones and mudstones with tuffaceous input, which were previously ascribed to the Early Cretaceous Rayoso Formation. They...
A general summary of the main unconformities which produced major order break-ups during the evolution of the Mesozoic sedimentary infill of the Neuquén Basin is offered in this paper. Based on its hierarchy, they are categorized in three groups, as follows: 1) key unconformities widely spread along the whole basin; 2) «Intracuyan» unconformities r...
The Chos Malal Formation nov. is proposed to group a 140,50 m thick neogene succession of epiclastic sedimentites including sandstones, silstones and mudstones with tuffaceous input, which were previously ascribed to the Early Cretaceous Rayoso Formation. They were accumulated during the formation of a syncline elongated in a NNW-SSE direction, bei...
The contributions of some distinguished geoscientist of he SEGEMAR to geological knowledge of the National Territory. This synthesis offers some of the most relevant contributions to the geological knowledge of the National Territory, personified throught several outstanding figures, which worked in the SEGEMAR since the time of its foundation, wit...
ABSTRACT
The Pliensbachian to Early Callovian Cuyo Group in the Arroyo La Jardinera area reflects a shelf-slope-basin plain physiography. A major unconformity defines the onset of a thick turbidite succession and represents a 2nd order sequence boundary. The older 2nd order depositional sequence comprises the base of Los Molles Formation and inclu...
The Pliensbachian to Early Callovian Cuyo Group in the Arroyo La Jardinera area reflects a shelf-slope-basin plain physiography. A major unconformity defines the onset of a thick turbidite succession and represents a 2nd order sequence boundary. The older 2nd order depositional sequence comprises the base of Los Molles Formation and includes a tran...
