Nicaragua Meteorite, Pantasma, English

Meteoritics & Planetary Science, 2019

The circa 14 km diameter Pantasma circular structure in Oligocene volcanic rocks in Nicaragua is here studied for the first time to understand its origin. Geomorphology, field mapping, petrographic and geochemical investigations all are consistent with an impact origin for the Pantasma structure. Observations supporting an impact origin include outward-dipping volcanic flows, the presence of former melt-bearing polymict breccia, impact glass (with lechatelierite and low H 2 O, < 300 ppm), and also a possible ejecta layer containing Paleozoic rocks which originated from hundreds of meters below the surface. Diagnostic evidence for impact is provided by detection in impact glass of the former presence of reidite in granular zircon as well as coesite, and extra-terrestrial  54 Cr value in polymict breccia. Two 40 Ar/ 39 Ar plateau ages with a combined weighted mean age of 815 ± 11 ka (2 σ; P=0.17) were obtained on impact glass. This age is consistent with geomorphological data and erosion modeling, which all suggest a rather young crater. Pantasma is only the fourth exposed crater > 10 km found in the Americas

Communications Earth & Environment

Tektites are terrestrial impact-generated glasses that are ejected long distance (up to 11,000 km), share unique characteristics and have a poorly understood formation process. Only four tektite strewn-fields are known, and three of them are sourced from known impact craters. Here we show that the recently discovered Pantasma impact crater (14 km diameter) in Nicaragua is the source of an impact glass strewn-field documented in Belize 530 km away. Their cogenesis is documented by coincidental ages, at 804 ± 9 ka, as well as consistent elemental compositions and isotopic ratios. The Belize impact glass share many characteristics with known tektites but also present several peculiar features. We propose that these glasses represent a previously unrecognized tektite strewn-field. These discoveries shed new light on the tektite formation process, which may be more common than previously claimed, as most known Pleistocene &gt;10 km diameter cratering events have generated tektites.

Smithsonian Global Volcanism Program, 2012

Monthly Bulletin (BGVN 37:01) References: Dionis, S., Melián, G., Barrancos, J., Padilla, G., Calvo, D., Rodríguez, F., Padrón, E., Nolasco, D., Hernández, Pedro A., Pérez, N. M., Ibarra, M., and Muñoz, A., 2010. Dynamics of diffuse CO2 emission and eruptive cycle at Cerro Negro volcano, Nicaragua, Cities on Volcanoes 6, Puerto de la Cruz, Tenerife, 31 May-4 June, 2010, Abs, p 103. Hill, B. E., Connor, C.B, Jarzemba, M.S., La Femina, P.C., Navarro, M., and Strauch, W., 1998, 1995 eruptions of Cerro Negro volcano, Nicaragua, and risk assessment for future eruptions, Geological Society of America Bulletin, 110, no. 10;1231-1241. NASA Landsat Program, 2003, Landsat ETM+ scene 7dt19991115, SLC-Off, USGS, Sioux Falls, Nov. 15, 1999. McKnight, S.B. and Williams, S.N., 1997, Old cinder cone or young composite volcano?: The nature of Cerro Negro, Nicaragua, Geology, 25, 339-342. Information Contacts: Instituto Nicaragüense de Estudios Territoriales (INETER), Apartado Postal 2110, Managua, Nicaragua (URL: http://www.ineter.gob.ni/geofisica/ ); Global Land Cover Facility ( URL: http:// http://www.glcf.umiacs.umd.edu/ ); Instituto Tecnológico y de Energías Renovables (ITER), 38611 Granadilla, Tenerife, Canary Islands, Spain (URL: http://www.iter.es/); Washington Volcanic Ash Advisory Center (VAAC), Satellite Analysis Branch (SAB), NOAA/NESDIS E/SP23, NOAA Science Center Room 401, 5200 Auth Rd, Camp Springs, MD 20746, USA (URL: http://www.ssd.noaa.gov/VAAC/); and La Prensa de Nicaragua, Managua, Nicaragua (URL: http://www.laprensa.com.ni/).

Science, 1965

SOlE NOCE About 15 kilometers south of Gancedo, Chaco Province, in the same general region in which these meteorites occur, three shallow depressions were discovered in 1913 by Manuel of Santillan Suairez. These, and a fourth at an unspecified location, were invesina tigated by Natgera in 1923 (8). Naigera believed the depressions to have been dug by Indians, and meteorites found pique in one to have been hidden there by them. Spencer, however, concluded in arth. 1933 that the depressions were meteorite impact craters (9). unch, lilton Argentine-American Expedition The earliest Spanish explorers to enter the region that now is northern Argentina heard marvelous stories from the Indians of a large block of iron that had supposedly fallen from the sky. The place where it lay was called Piguem Nonralta, or, in Spanish, Campo del Cielo (Field of the Sky or Heaven). In 1576 an expedition under Captain Hernain Mexia de Miraval visited the site, returning with a few small pieces of a very large mass, which came to be known as the Meson de Fierro (Large Table of Iron). Suspecting a silver deposit rivaling those of Peru, Bartolome Francisco de Maguna led expeditions to the site in 1774 and 1776. He estimated the Meson de Fierro to weigh about 500 quintales (23 metric tons) and brought back samples, which were found to be iron of extraordinary quality. To determine the workability of the deposit, expeditions were sent to the site in 1779 under Sergeant Major Francisco de Ibarra, and in 1783 under Royal Navy Lieutenant Miguel Rubin de Celis. In

Smithsonian Global Volcanism Program, 2012

Monthly Bulletin (BGVN 37:03) References. Borgia, A., Delaney, P.T. and Denlinger, R.P., 2000. Spreading volcanoes. Annual Review of Earth and Planetary Sciences, 28, 539-570. Carr, M.J., Saginor, I., Alvarado, G.E., Bolge, L.L., Lindsay, F.N., Milidakis, K., Turrin, B.D., Feigenson, M.D. and Swisher, C.C., 2007. Element fluxes from the volcanic front of Nicaragua and Costa Rica. Geochemistry Geophysics Geosystems (G3), 8, 6. French, S.W., Warren, L.M., Fischer, K.M., Abers, G.A., Strauch, W., Protti, J.M., and Gonzalez, V., 2010. Constraints on upper plate deformation in the Nicaraguan subduction zone from earthquake relocation and directivity analysis, Geochemistry, Geophysics, Geosystems (G3), 11, 3. Funk, J., Mann, P., McIntosh, K., and Stephens, J., 2009. Cenozoic tectonics of the Nicaraguan depression, Nicaragua, and Median Trough, El Salvador, based on seismic-reflection profiling and remote-sensing data, GSA Bulletin 121, 11-12, 1491-1521. Kapelanczyk, L.N., 2011. An eruptive history of Maderas Volcano using new 40Ar/39Ar ages and geochemical analyses [Master’s thesis]: Houghton, MI, Michigan Technological University, 118 p. Kapelanczyk, L.N., Rose, W.I., and Jicha, B.R., 2012. An eruptive history of Maderas volcano using new 40Ar/39Ar ages and geochemical analyses. Bulletin of Volcanology, In Review. LaFemina, P.C., Dixon, T.H., and Strauch, W., 2002. Bookshelf faulting in Nicaragua, Geology, 30, 751-754. Mathieu, L., van Wyk de Vries, B., Pilato, M. and Troll, V.R., 2011. The interaction between volcanoes and strike-slip, transtensional and transpressional fault zones: Analogue models and natural examples. Journal of Structural Geology, 33, 898-906. NASA Landsat Program, 2003, Landsat ETM+ scene 7dx20000127, SLC-Off, USGS, Sioux Falls, Jan. 27, 2000. van Wyk de Vries, B. and Borgia, A., 1996. The role of basement in volcano deformation. Geological Society Special Publication, 110, 95-110. Information Contacts: Instituto Nicaragüense de Estudios Territoriales (INETER), Apartado Postal 2110, Managua, Nicaragua (URL: http://www.ineter.gob.ni/); Global Land Cover Facility (URL: http:// http://www.glcf.umiacs.umd.edu/); National Earthquake Information Center (NEIC), US Geological Survey, Geologic Hazards Team Office, Colorado School of Mines, 1711 Illinois St., Golden, CO 80401, USA (URL: http://wwwneic.cr.usgs.gov/neis/epic/epic_rect.html); La Prensa (http://archivo.laprensa.com.ni).

Smithsonian Global Volcanism Program, 2012

Monthly Bulletin (BGVN 37:06) Information Contacts: Instituto Nicaragüense de Estudios Territoriales (INETER), Apartado Postal 2110, Managua, Nicaragua (URL: http://www.ineter.gob.ni/geofisica/), La Prensa (URL: http://www.laprensa.com.ni/2012/04/30/ambito/99799/imprimir).

2011

The fi rst catalogue of impact craters sites in South America is presented here. Proximately thirty proven, suspected and disproven structures have been identifi ed by several sources in this continent until now. But everyone events proposed here

Geochemistry, 2018

In the first part of this review of the impact record of South America, we have presented an up-to-date introduction to impact processes and to the criteria to identify/confirm an impact structure and related deposits, as well as a comprehensive examination of Brazilian impact structures. The current paper complements the previous one, by reviewing the impact record of other countries of South America and providing current information on a number of proposed impact structures. Here, we also review those structures that have already been discarded as not being formed by meteorite impact. In addition, current information on impact-related deposits is presented, focusing on impact glasses and tektites known from this continent, as well as on the rare K-Pg boundary occurrences revealed to date and on reports of possible large airbursts. We expect that this article will not only provide systematic and up-to-date information on the subject, but also encourage members of the South American geoscientific community to be aware of the importance of impact cratering and make use of the criteria and tools to identify impact structures and impact deposits, thus potentially contributing to expansion and improvement of the South American impact record.

Temáticas do ensino de Sociologia na escola brasileira, 2022

Este capítulo se estrutura em quatro partes, além desta introdução e das considerações finais. Na primeira seção apresentamos os aspectos que envolvem a Sociologia enquanto disciplina escolar. Na segunda parte, nosso foco está nos impactos de algumas das políticas públicas sobre o campo do ensino de Sociologia. Na terceira parte, nosso olhar se volta ao que denominamos “subcampo de pesquisa do ensino de Sociologia”, buscando apresentar um breve esboço das conformações de parte da comunidade acadêmica que vem se envolvendo com o ensino de Sociologia enquanto objeto de pesquisa. Por fim, na quarta parte, realizamos algumas reflexões quanto aos avanços ainda necessários ao campo do ensino da Sociologia.

2021

Un résumé de l'entretien en ligne mené avec le prof. Said Bennis, professeur en sciences sociales à l'Université Mohamed V de Rabat, et de l'étude réalisée en commun par l'Université Mohamed V et le Goethe-Institut Marokko Rabat, février 2021 Seite 2 VIE ? CARRIÈRE ? OPPORTUNITÉS ? POURQUOI L'ALLEMAGNE ? Pourquoi les jeunes marocains veulent-ils émigrer en Allemagne et qu'en attendent-ils ? Le prof. Said Bennis a réalisé une étude scientifique pour le compte du Goethe-Institut Marokko en 2020 et interrogé plus de 300 personnes apprenant l'allemand à Rabat, Casablanca et Meknès quant à leurs motivations et projets. Dans l'entretien en ligne, il présente les résultats de l'étude et explique pourquoi les attentes des candidats à l'émigration sont souvent en décalage avec la réalité. Il analyse également l'importance de l'acceptation sociale et de l'environnement familial dans l'émigration. Voici un résumé des déclarations essentielles de l'entretien en ligne sur l'étude. L'entretien en ligne est consultable ici : youtube.com/goetheinstitutmarokko https://youtu.be/XHdvAM9mAHQ 12.04.2021 Migration-Recherches