Georgina Erra

Georgina Erra
Universidad Nacional de La Plata | UNLP · Museo de La Plata

Dra. Ciencias Naturales

About

29
Publications
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243
Citations

Publications

Publications (29)
Article
The Triassic Cuyo rift Basin is one of the renowned petroleum systems in South America that records distinctive alluvial, lacustrine and fluvial settings with volcanic input. The present study focuses on the clay mineral assemblages that represent the syn‐rift to post‐rift fills. Four clay mineral assemblages are defined based on X‐ray diffraction,...
Article
The Triassic Agua de la Zorra Formation crops out in the Paramillos de Uspallata area (NW of Mendoza) and represents a deltaic-lacustrine system with volcanic activity as well as episodic incursions of peperitic basalts. The succession is characterized by distal lacustrine facies at base and top, with proximal shallow facies in the middle section....
Article
The Vaca Muerta Formation, located in the Neuquén Basin (Argentina), is one of the most important shale plays in the world. A detailed organic matter structure characterization of the formation and its evolution during maturation is a must for the correct evaluation of petroleum potential. The present work studies molecular characteristics of organ...
Conference Paper
Full-text available
Esta contribución constituye un aporte a la evaluación del potencial oleogenético de los depósitos triásicos lacustres de la Formación Cacheuta, Cuenca Cuyana, centro-oeste de la Argentina, a partir de análisis palinológicos y geoquímicos del querógeno. Se estudiaron 16 muestras de cutting por microscopia de luz transmitida, fluorescencia y pirólis...
Conference Paper
Modern grasses in the family Poaceae exhibit exceptional taxonomic and ecological diversity, with grassland-dominated habitats covering about 40% of Earth’s land surface. Grasslands today occur in a range of temperate to tropical ecosystems, spanning low to high altitudes and wet to arid climates. However, because of the scant fossil record of gras...
Article
The Agua de la Mula Member of the Agrio Formation in the Neuquén Basin, comprises marine deposits accumulated in a mixed carbonate-siliciclastic outer ramp during the late Hauterivian. An innovative multi-proxy study that includes sedimentological, geochemical and paleobiological data from the El Portón section were combined in order to constrain t...
Article
Full-text available
A method to study kerogen type and maturity of organic matter in source rocks using XPS was developed. Samples from three Argentinian shale rocks containing different kerogen types were analyzed by XPS directly, without kerogen isolation. Analysis focused on characterizing the chemical structure of kerogen, in particular of carbon species. Two new...
Article
This paper presents the study of the kerogen recovered from the Casa de Piedra Formation. The analysis includes systematic palynology, palynofacies, organic geochemistry (total organic carbon—TOC—and pyrolysis Rock-Eval) and inorganic geochemistry (X-ray fluoroescence). A new spore species is introduced: Rugulatisporites claudiae sp. nov. Three pal...
Article
A detailed characterization of the organic matter in sediments gives a key parameter for a correct evaluation of the petroleum generation potential of a source rock and its modeling in an oil system. To understand the features of the organic matter stored in source rocks, a wide variety of routine techniques are used. Those techniques are mostly de...
Poster
Full-text available
ABSTRACT. The Casa de Piedra Formation (Ladinian/ Carnian) was deposited in a fluvio/ deltaic lacustrine environment. Chemical analysis of kerogen reveals high values of total organic carbon. The basal two - thirds are dominated by generally low fluorescent, amorphous kerogen, and high percents of yellow fluorescent Botryococcus colonies (kerogen t...
Chapter
Silicophytoliths are amorphous silica biomineralizations deposited in intracellular or extracellular spaces of plant tissues. Due to their taxonomic value and their high preservation in a variety of soils and sediments, they are widely used as indicators of past plant communities. Numerous phytolith studies show the presence of past grass-dominated...
Article
Full-text available
p class="p1"> RESUMEN En esta contribución se da a conocer el primer registro de termiteros fósiles para la región Mesopotámica de Argentina, y su disposición espacial, al tiempo que se discuten sus afinidades taxonómicas e implicancias paleoambientales. Las estructuras fósiles pertenecen a nidificaciones de insectos sociales atribuibles a miembro...
Article
Full-text available
Two Pleistocene sedimentary units are recognized in the Corrientes province, Argentina: the Toropí and Yupoí formations. These sediments have proven productive for fossil vertebrates, but few macrofossils have been recovered. To remedy this situation, plant silica (phytoliths) were extracted from the sediments, enabling a direct comparison of paleo...
Article
Full-text available
Loess deposits are the main component of the Late Quaternary sequences of Pampa plains (South America). The loess unit of the Last Glacial Maximum at the leeward side of the Pampean aeolian system represents primary loess, indicating the expansion of semiarid conditions to the NE of that system. The Tezanos Pinto Formation is the typical loessic un...
Article
Full-text available
Loess deposits are the main component of the Late Quaternary sequences of Pampa plains (South America). The loess unit of the Last Glacial Maximum at the leeward side of the Pampean aeolian system represents primary loess, indicating the expansion of semiarid conditions to the NE of that system. The Tezanos Pinto Formation is the typical loessic un...
Article
Full-text available
Plant opal silica bodies (phytoliths) obtained from scraped food residues from the inside walls of pottery vessels are described and identified as maize (Zea mays, Poaceae) cob bodies. These vessels come from the archaeological locality of Meliquina (-40 degrees 19'S -71 degrees 19'W), Lacar Department and Lanin National Park, Patagonia, Argentina...
Article
Full-text available
Plant opal silica bodies (phytoliths) obtained from scraped food residues from the inside walls of pottery vessels are described and identifed as maize (Zea mays, Poaceae) cob bodies. These vessels come from the archaeological locality of Meliquina (-40° 19´S -71° 19´W), Lácar Department and Lanín National Park, Patagonia, Argentina and were dated...
Article
Systematic assignation and paleocommunities inferred by a phytolite study of quaternary sediments from Entre Rios, Argentina. Phytolith analysis is one of the paleobotanic disciplines used for the reconstruction of past ecosystems, because they provide a precise record of part of the vegetation for a specific time and place. In this context, the co...
Chapter
Full-text available
Se presentan los resultados del análisis fitolí-tico realizado sobre artefactos de molienda pertene-cientes a la localidad arqueológica Tapera Moreira, ubicada a 38° 33' de latitud sur y 65° 33' de longitud oeste (departamento de Lihué Calel, provincia de La Pampa). Se destaca la presencia de fitolitos co-rrespondientes a células bulliformes, célul...
Article
Full-text available
The spores of the following genera of Polypodiaceae growing in northwest Argentina were analyzed: Campyloneurum, Microgramma, Pecluma, Phlebodium, Pleopeltis and Polypodium. The study involved analyses of herbarium material using light microscopy and scanning electron microscopy. The spores are monolete, 40–90 μm in major equatorial diameter, elipt...

Projects

Project (1)
Project
Para evaluar la capacidad de generación de hidrocarburos de las rocas generadoras se utiliza una amplia variedad de técnicas que permiten estimar su madurez térmica. La técnica empleada por excelencia corresponde al análisis visual de la materia orgánica (MO) y la medición de la “Reflectancia de la Vitrinita (% Ro)”. Esta metodología de análisis óptico de la materia orgánica en microscopio de luz reflejada, será aplicada de manera comparativa junto a otras técnicas de microscopia como microscopia de luz transmitida y de fluorescencia, que permitirán realizar el análisis visual del querógeno y la fluorescencia de la liptinita, y de este modo y hacer estimaciones sobre su madurez térmica.