Geochemical and mineralogical characterization of the Loma de la Plata and Valle Esperanza deposits, Navidad district, Argentina

Los depósitos Loma de la Plata y Valle Esperanza del distrito Navidad, cuyos recursos argentíferos son de 5000 y 2000 t de Ag, respectivamente, contienen las principales anomalías de Ag y Cu en autobrechas de las andesitas de la Formación Cañadón Asfalto (Jurásico). El estudio de brechas, vetas y vetillas en tres secciones de estos depósitos indica dos estadios de relleno pre- y postmineralización estériles (calcita, laumontita, baritina, calcedonia) y un estadio mineralizante con tres pulsos principales: a) calcopirita-galena-esfalerita, b) tennantita-tetraedrita, bornita y c) polibasita, jalpaita, estromeyerita, mckinstryita y plata nativa. La alteración hidrotermal de las rocas volcánicas (clorita, titanita, adularia, calcita, laumontita, celadonita, calcedonia, illita-esmectita y esmectita) es débil a moderada y se restringe a las zonas de contacto con las brechas, vetas y vetillas. La mineralogía y paragénesis identificadas en ambos depósitos sugieren fluidos con pH neutro y un descenso progresivo de la fugacidad del S con la evolución del sistema hidrotermal. La precipitación de los metales pudo haber ocurrido por mezcla de fluidos y/o ebullición. Las características permiten clasificarlos como depósitos polimetálicos ricos en Ag. A diferencia de otros depósitos del distrito Navidad, la plata está contenida principalmente en los sulfuros de Cu y Ag y plata nativa.Geochemical and mineralogical characterization of the Loma de la Plata and Valle Esperanza deposits, Navidad district, Argentina. Loma de la Plata and Valle Esperanza deposits (with 5000 and 2000 t Ag, respectively) host the main Ag and Cu anomalies in the andesitic autobreccias of the Cañadón Asfalto Formation. The study of the hydrothermal breccias, veins and veinlets from three sections indicates two pre and post mineralization stages (calcite, laumontite, barite, chalcedony) and one mineralizing stage with three main pulses: a) chalcopyrite-galena-sphalerite, b) tennantite-tetrahedrite, bornite and c) polybasite, jalpaite, stromeyerite, mckinstryite and native silver. Weak to moderate hydrothermal alteration of the volcanic host rocks (chlorite, titanite, adularia, calcite, laumontite, celadonite, chalcedony, illite-smectite and smectite) occurs at the contact zones with the mineralization. In both deposits, mineral assemblages suggest that hydrothermal fluids were neutral to alkaline and a progressive decrease of the sulfur fugacity during the evolution of the hydrothermal system. Metal precipitation could have been triggered by fluid mixing and/or boiling. Based on the mineralogical textural and geochemical features, both are classified as Ag-rich polymetallic deposits. Unlike other deposits of the Navidad district, silver is mainly contained in Ag-Cu sulfides and in native silver.Fil: Mercado, Maximiliano Martín. Universidad Nacional de Río Negro; Argentina. Centro Patagónico de Estudios Metalogenéticos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Confluencia; ArgentinaFil: Peralta, Florencia Lucia. Universidad Nacional del Sur. Departamento de Geología; ArgentinaFil: Pons, María Josefina. Universidad Nacional de Río Negro. Sede Alto Valle. Instituto de Investigaciones en Paleobiología y Geología; Argentina. Centro Patagónico de Estudios Metalogenéticos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Confluencia; ArgentinaFil: Franchini, Marta Beatriz. Universidad Nacional de Río Negro. Sede Alto Valle. Instituto de Investigaciones en Paleobiología y Geología; Argentina. Centro Patagónico de Estudios Metalogenéticos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Confluencia; ArgentinaFil: Impiccini, Agnes. Universidad Nacional del Comahue. Facultad de Ingeniería. Departamento de Geología y Petróleo; ArgentinaFil: Rainoldi, Ana Laura. Centro Patagónico de Estudios Metalogenéticos; Argentina. Universidad Nacional del Sur. Departamento de Geología; Argentin

Plan de negocios para la comercialización de muebles plegables

Trabajo de investigaciónThe present work develops the plan to distribute folding/flexible furniture to the homes of Peru, to the families of a socio-economic level B. Based on the compiled information, the information from the statistics of population growth and the depth interviews made, we found a business opportunity focused on the necessity of optimizing the spaces of apartments, which are getting smaller every day. In this situation, our proposition is based on giving to our clients the comfort and optimization of their reduced spaces with flexible tailor-made furniture of the best quality, to tender a solution to this modern problem of smaller spaces. The operation of the business will be based on the strategic alliances established with the suppliers who will have to fulfill with all the necessary accreditations and follow the strict quality controls. The strategy we are looking forward is to win the customer loyalty by offering a personal sale and post-sale service. Giving the clients the possibility of a close contact with the process of fabrication of the product

Representations of government measures in the context of COVID-19

Resumen: Se considera determinante para detener la rápida propagación del COVID-19, lograr adherencia de la población a las políticas públicas preventivas indicativas de comportamiento. Las recomendaciones han sido diferentes en los distintos países y han arrojado resultados variados en términos de prevalencia del COVID-19 (Montreal Behavioural Medicine Centre, 2020). El Estudio International COVID- 19 Awareness and Responses Evaluation Study (ICARE) asociado a las políticas de salud pública busca conocer si es loable optimizar las estrategias aplanando la curva de infección por COVID-19. Entre los hallazgos se relevó una preocupación central en el 80 % de los participantes de que un miembro de la familia no conviviente o allegados se infectará de COVID-19. Las respuestas exhibían mayor desazón por los impactos potenciales del COVID-19 en otras personas cercanas que en sí mismos. Estos hallazgos podrían dar cuenta de conductas de solidaridad y prosociales muy relevantes a la hora de diseñar campañas de prevención y desarrollo estratégico de políticas públicas, fomentando y haciendo foco en el cuidado del otro.Abstract: In stopping the rapid spread of COVID-19, it is essential for the population to adhere to preventive state policies. The recommendations have been different in different nations and have yielded mixed results (Montreal Behavioral Medicine Center, 2020). The International COVID-19 study Awareness and Response Assessment Study (ICARE) -regarding public health policies- seeks to know the viability of optimising strategies which intend to flatten the COVID-19 infection curve. Among the findings, a central concern was revealed in 80% of the participants: Fear of close friends or family members outside the household being infected with COVID-19. Responses exhibited greater unease about the potential impacts of COVID-19 on others close to them than on themselves. These findings could account for prosocial and altruistic behaviours which are highly relevant to the design of prevention campaigns and state policies focusing on caring for others

Brazilian Flora 2020: Leveraging the power of a collaborative scientific network

International audienceThe shortage of reliable primary taxonomic data limits the description of biological taxa and the understanding of biodiversity patterns and processes, complicating biogeographical, ecological, and evolutionary studies. This deficit creates a significant taxonomic impediment to biodiversity research and conservation planning. The taxonomic impediment and the biodiversity crisis are widely recognized, highlighting the urgent need for reliable taxonomic data. Over the past decade, numerous countries worldwide have devoted considerable effort to Target 1 of the Global Strategy for Plant Conservation (GSPC), which called for the preparation of a working list of all known plant species by 2010 and an online world Flora by 2020. Brazil is a megadiverse country, home to more of the world's known plant species than any other country. Despite that, Flora Brasiliensis, concluded in 1906, was the last comprehensive treatment of the Brazilian flora. The lack of accurate estimates of the number of species of algae, fungi, and plants occurring in Brazil contributes to the prevailing taxonomic impediment and delays progress towards the GSPC targets. Over the past 12 years, a legion of taxonomists motivated to meet Target 1 of the GSPC, worked together to gather and integrate knowledge on the algal, plant, and fungal diversity of Brazil. Overall, a team of about 980 taxonomists joined efforts in a highly collaborative project that used cybertaxonomy to prepare an updated Flora of Brazil, showing the power of scientific collaboration to reach ambitious goals. This paper presents an overview of the Brazilian Flora 2020 and provides taxonomic and spatial updates on the algae, fungi, and plants found in one of the world's most biodiverse countries. We further identify collection gaps and summarize future goals that extend beyond 2020. Our results show that Brazil is home to 46,975 native species of algae, fungi, and plants, of which 19,669 are endemic to the country. The data compiled to date suggests that the Atlantic Rainforest might be the most diverse Brazilian domain for all plant groups except gymnosperms, which are most diverse in the Amazon. However, scientific knowledge of Brazilian diversity is still unequally distributed, with the Atlantic Rainforest and the Cerrado being the most intensively sampled and studied biomes in the country. In times of “scientific reductionism”, with botanical and mycological sciences suffering pervasive depreciation in recent decades, the first online Flora of Brazil 2020 significantly enhanced the quality and quantity of taxonomic data available for algae, fungi, and plants from Brazil. This project also made all the information freely available online, providing a firm foundation for future research and for the management, conservation, and sustainable use of the Brazilian funga and flora