168 research outputs found
The central Fuegian fold and thrust belt in Tierra del Fuego: Strike‐slip tectonics superimposed onto compressional deformation
No full textThe boundary between South America and Scotia plates was established during Neogene times when a wrench tectonic regime was developed along the central area of Tierra del Fuego. This boundary includes the Magallanes–Fagnano fault system: a regional diffuse deformation zone, which involves the development of the satellite Yehuin–Chepelmut fault zone and a series of pull-apart basins overprinting the Fuegian fold and thrust belt. The analysis of regional seismic lines allowed to reconstruct and recognize the structure of the external fold and thrust belt. The interpreted structures were integrated into a regional transect and a 3D block diagram that display the different structural domains and, mainly, the wrench deformation associated with the Magallanes–Fagnano fault system. Geophysical data from gravity and magnetic anomaly maps provided further support for the location and development of the pull-apart basins along the plate boundary. The deformation of the external fold and thrust belt is characterized by an imbricated fan system with a Paleogene detachment surface, which was later cut across by the Yehuin–Chepelmut fault zone and the Magallanes–Fagnano fault system.Fil: Lozano, Jorge Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; ArgentinaFil: Bran, Donaldo Mauricio. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Peroni, Javier Ignacio. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Lodolo, Emanuele. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale; ItaliaFil: Menichetti, Marco. Università Degli Studi Di Urbino Carlo Bo; ItaliaFil: Cerredo, Maria Elena. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Tassone, Alejandro Alberto. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentin
The influence of local environmental and socio-economic conditions on the impacts of ash storms
No full textVolcanic ash wind-induced remobilization events have increasingly been reported in different areas around the worl during the last decadesEstación Experimental Agropecuaria BarilocheFil: Forte, Pablo. Universidad Johannes Gutenberg. Instituto de Geociencias; AlemaniaFil: Dominguez, Lucía. Universidad de Ginebra. Departamento de Ciencias de la Tierra; SuizaFil: Lamberti, María Clara. Universidad de Ginebra. Departamento de Ciencias de la Tierra; SuizaFil: Gregg, Chris E. Universidad East Tennessee State. Departamento de Geociencias; Estados UnidosFil: Bran, Donaldo Eduardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Laboratorio de Teledetección; ArgentinaFil: Castro, Jonathan M. Universidad Johannes Gutenberg. Instituto de Geociencias; Alemani
sj-pdf-1-hol-10.1177_09596836211060496 – Supplemental material for Stratigraphic signature of the Perito Moreno ice-dammings during the Little Ice Age (southern Patagonia, Argentina)
No full textSupplemental material, sj-pdf-1-hol-10.1177_09596836211060496 for Stratigraphic signature of the Perito Moreno ice-dammings during the Little Ice Age (southern Patagonia, Argentina) by Mauro Caffau, Emanuele Lodolo, Federica Donda, Massimo Zecchin, Jorge G Lozano, Federica Nasi, Donaldo M. Bran, Alejandro Tassone and Andrea Caburlotto in The Holocene</p
Origin and evolution of lago Yehuin (Tierra del Fuego, Argentina): Results from a geophysical survey
No full textLago Yehuin, a WNW-ESE elongated basin located in the outer fold-and-thrust belt of the Fuegian
Andes, occupies a compartmented structural depression originated along a segment of the left-lateral Lago Deseado
fault system. This paper describes the first geophysical survey performed within the lake. New acquired high-resolution
single-channel seismic data, integrated with geological information in the surroundings of the Lago Yehuin, allowed to:
(i) produce a complete bathymetric map of the lake, (ii) reconstruct the basement surface of the lake, and (iii) analyze
the geometry, distribution, and thickness of the sedimentary infill. Two sub-basins were recognized within Lago Yehuin:
A western sub-basin, 7.5 km long, with a maximum depth of 118 m; an eastern sub-basin, 7.2 km long with a maximum
depth of 80 m. Both sub-basins are limited by a set of normal faults which overprint NE-verging thrusts. Three seismostratigraphic
units have been identified in the seismic records: (1) a lower unit with wedged geometry interpreted as a
mass flow deposits; (2) a thick (up to 120 m) intermediate unit of glacio-lacustrine nature and irregularly distributed
in the Yehuin basin; (3) a thin (generally <10 m) upper lacustrine unit which drapes the entire basin. Lago Yehuin is
considered a Neogene basin generated by strike-slip tectonics that was later affected by glacial and glacio-lacustrine
deposition. Interpreted submerged ridge moraines within Lago Yehuin are correlated with onland moraine arcs built by
the complete recessional paths of Fuego and Ewan ice lobes. A significant structural control is proposed not only for the
formation of Lago Yehuin, but also for the general paths of the northern arms of the Fagnano palaeo-glacier
Ash resuspension related to the 2011–2012 Cordón Caulle eruption, Chile, in a rural community of Patagonia, Argentina
No full textThe 2011–2012 Cordón Caulle eruption emitted about 1 km3 of rhyodacitic tephra. Dominant westerly winds in the region caused most of the primary tephra to deposit in neighboring Argentina. In addition to the impact of widespread dispersal and fallout of primary tephra during the eruption, Argentinawas also significantly affected by remobilization of the primary ash even several years after the climactic phase of the eruption. In this mixed methods study,we combine aspects of natural and social sciences to characterize the ash resuspension events associated with the 2011–2012 Cordón Caulle deposits and assess the impacts on the Argentinian farming community
of Ingeniero Jacobacci in the Patagonian Steppe.
Our findings showthe primary importance of wind, rainfall and ash availability in controlling the occurrence and persistence of ash resuspension events. The role played by these variables was also reflected in the seasonal distribution of events observed. Regarding the impacts, our results complement those of earlier studies and demonstrate that ash resuspension events can exacerbate the negative impact of primary tephra fallout events from the time of deposition to many years after the eruption. Only after five years has the environment and the farming community begun to show signs of recovery. Our findings also highlight the importance of assessing ash resuspension events in multi-hazard scenarios involving volcanic and hydrometeorologic hazards.EEA BarilocheFil: Forte, Pablo. University of Mainz. Institute of Geosciences; AlemaniaFil: Dominguez, Lucia. University of Geneva. Department of Earth Sciences; SuizaFil: Bonadonna, Constanza. University of Geneva. Department of Earth Sciences; SuizaFil: Gregg, Chris E. East Tennessee State University. Department of Geosciences; Estados UnidosFil: Bran, Donaldo Eduardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; ArgentinaFil: Bird, Deanne. University of Iceland. Institute of Life and Environmental Sciences; IslandiaFil: Castro, Jonathan M. University of Mainz. Institute of Geosciences; Alemani
Tormentas de ceniza volcánica en Patagonia : un peligro latente y subestimado
No full textForo Internacional: Los volcanes y su impacto. Arequipa, Peru, 26 y 27 de abril de 2018.Una tormenta de ceniza volcánica puede definirse como un evento de remobilización masiva de ceniza volcánica (<2mm) a partir de la acción eólica (via suspensión, saltación y reptaje). Pero, ¿a qué nos referimos exactamente cuando hablamos de resuspensión de ceniza volcánica? Bajo determinadas condiciones meteorológicas y ambientales, como vientos intensos, baja humedad de suelos y falta de cobertura vegetal, las partículas volcánicas pueden ser desprendidas de la superficie y puestas nuevamente en suspensión en la atmósfera.Estacion Experimental Agropecuaria Bariloche. Laboratorio de TeledetecciónFil: Forte, Pablo.Instituto de Geociencias, Universidad Johannes Gutenberg; AlemaniaFil: Dominguez, Lucía. Université de Genève. Department of Earth Sciences; SuizaFil: Bonadonna, Constanza. Departamento de Ciencias de la Tierra. Universidad de Ginebra; SuizaFil: Lamberti, María Clara. Departamento de Ciencias de la Tierra. Universidad de Ginebra; SuizaFil: Gregg, Chris E.East Tennessee State University. Department of Geosciences; Estados UnidosFil: Bran, Donaldo Eduardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Laboratorio de Teledetección; ArgentinaFil: Castro, Jonathan M. Institut für Geowissenschaften Johannes Gutenberg-Universität Mainz ; Alemani
A geophysical assessment of the Termas de Río Valdez geothermal area (Tierra del Fuego, Argentina)
No full textDynamics of volcanic ash remobilisation by wind through the Patagonian steppe after the eruption of Cordón Caulle, 2011
No full textWind erosion of freshly-deposited volcanic ash causes persistent storms, strongly affecting ecosystems and human activity. Wind erosion of the volcanic ash was measured up to 17 months after the ash deposition, at 7 sites located within the ash-deposition area. The mass flux was measured up to 1.5 m above ground level. Mass transport rates were over 125 times the soil wind-erosion rates observed before the ash deposition, reaching up to 6.3 kg m−1 day−1. Total mass transport of ash during the 17 months ranged between 113.6 and 969.9 kg m−1 depending on topographic location and wind exposure. The vertical distribution of the mass flux at sites with higher vegetation cover was generally inverted as compared to sites with lower vegetation cover. This situation lasted 7 months and then a shift towards a more uniform vertical distribution was observed, in coincidence with the beginning of the decline of the mass transport rates. Decay rates differed between sites. Despite changes over time, an inverse linear correlation between the mass transports and the mass-flux gradients was found. Both the mass-flux gradients and the average mass-transport rates were not linked with shear-stress partition parameters, but with the ratio: ash-fall thickness to total vegetation cover.Fil: Panebianco, Juan Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; ArgentinaFil: Mendez, Mariano Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; ArgentinaFil: Buschiazzo, Daniel Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; Argentina. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Bran, Donaldo Eduardo. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Gaitán, Juan José. Instituto Nacional de Tecnología Agropecuaria; Argentin
Micronized bran enriched fresh egg tagliatelle: significance of gums addition on pasta technological features
No full text[EN] The aim of the work was to produce fibre-enriched fresh pasta based on micronised wheat bran and durum wheat semolina with appropriate techno-functional properties. Wheat semolina was replaced with fine particle size (50% below 75 mu m) wheat bran - up to 11.54% (w/w). A Box-Behnken design with randomised response surface methodology was used to determine a suitable combination of carboxymethylcellulose, xanthan gum and locust bean gum to improve pasta attributes: minimum cooking loss, maximum values for water gain and swelling index, as well as better colour and texture characteristics before and after cooking. The proximate chemical composition of wheat semolina and bran was determined and the microstructure of uncooked pasta was observed as well. From the response surface methodology analysis, it is recommended to use: (i) xanthan gum over 0.6% w/w as it led to bran-enriched pasta with a better developed structure and superior cooking behaviour, (ii) a combination of xanthan gum (0.8% w/w) and carboxymethylcellulose (over 0.6% w/w) to enhance uncooked pasta yellowness.The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: Authors would like to thank the Conselleria de Empresa, Universidad y Ciencia, Generalitat Valenciana (Spain) for financial support throughout the project AICO/2016/056.Martín-Esparza, M.; Raga-Soriano, A.; González Martínez, MC.; Albors, A. (2018). Micronized bran enriched fresh egg tagliatelle: significance of gums addition on pasta technological features. Food Science and Technology International. 24(4):309-320. https://doi.org/10.1177/1082013217750683S30932024
GC-TOF-MS-based serum metabolomic investigations of naked oat bran supplementation in high-fat-diet-induced dyslipidemic rats
No full textThe present study aimed to explore the metabolic response of oat bran consumption in dyslipidemic rats by a high-throughput metabolomics approach. Four groups of Sprague-Dawley rats were used: N group (normal chow diet), M group (dyslipidemia induced by 4-week high-fat feeding, then normal chow diet), OL group and OH group (dyslipidemia induced, then normal chow diet supplemented with 10.8% or 43.4% naked oat bran). Intervention lasted for 12 weeks. Gas chromatography quadrupole time-of-flight mass spectrometry was used to identify serum metabolite profiles. Results confirmed the effects of oat bran on improving lipidemic variables and showed distinct metabolomic profiles associated with diet intervention. A number of endogenous molecules were changed by high-fat diet and normalized following supplementation of naked oat bran. Elevated levels of serum unsaturated fatty acids including arachidonic acid (Log2Fold of change=0.70, P=.02 OH vs. M group), palmitoleic acid (Log2Fold of change-=1.24, P=.02 OH vs. M group) and oleic acid (Log2Fold of change=0.66, P=.04 OH vs. M group) were detected after oat bran consumption. Furthermore, consumption of oat bran was also characterized by higher levels of methionine and S-adenosylmethionine. Pathway exploration found that most of the discriminant metabolites were involved in fatty acid biosynthesis, biosynthesis and metabolism of amino acids, microbial metabolism in diverse environments and biosynthesis of plant secondary metabolites. These results point to potential biomarkers and underlying benefit of naked oat bran in the context of diet-induced dyslipidemia and offer some insights into the mechanism exploration. (C) 2015 Elsevier Inc. All rights reserved.SCI(E)[email protected]
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