Results 61 to 70 of about 21,460 (205)

Reconstruction of Core‐Surface Flows During the Last 3,300 Years

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract Understanding the Earth's magnetic field evolution requires examining the fluid flow at the core‐mantle boundary that drives the changes over different timescales. The inversion process to derive core‐surface flow velocities from secular variation data encounters non‐uniqueness issues, necessitating a priori assumptions that yield different ...
Pablo Rivera, F. J. Pavón‐Carrasco, M. L. Osete   +2 more
wiley   +1 more source

PROCEDIMIENTO METODOLÓGICO PARA EL DESARROLLO DE CARTOGRAFÍA TEMÁTICA EN RUTAS GEOEDUCATIVAS

Investigación y Postgrado
Las investigaciones en el campo de las geociencias y su enseñanza cada vez se hacen más importantes para la sustentabilidad ambiental. Su carácter transdisciplinario ha propiciado diálogos entre las diversas ciencias que la conforman con el patrimonio ...
Arismar Marcano-Montilla, Darwin Godoy
doaj   +2 more sources

Formation and evolution of a metasomatized lithospheric root at the motionless Antarctic plate: the case of East Island, Crozet Archipelago (Indian Ocean) [PDF]

, 2016
Sitting atop the nearly stagnant Antarctic plate (ca. 6.46 mm/yr), the Crozet archipelago midway between Madagascar and Antarctica constitutes a region of unusually shallow (1543-1756 m below sea level) and thickened oceanic crust (10-16.5 km), high ...
Bellieni, Giuliano, Levresse, Gilles, Marzoli, Andrea, Meyzen, CHRISTINE MARIE   +3 more
core  

Early Cretaceous absolute geomagnetic paleointensities from Córdoba province (Argentina) [PDF]

, 2006
We present here new paleointensity and geochronology results from Early Cretaceous volcanic rocks of Sierra Chica de Cordoba (Argentina). The new K-Ar isotopic ages of 5 samples range from 136 to 122 Ma.
Alva-Valdivia, Luis M., Cejudo Ruiz, Ruben, Geuna, Silvana Evangelina, Goguitchaichvili, Avto, Morales, Juan, Solé, Jesus   +5 more
core   +1 more source

Técnicas de microscopia aplicadas a las Geociencias

, 2015
Uno de los problemas con los que se enfrentan los alumnos a la hora de estudiar las geociencias es la falta de imágenes de alta calidad, especialmente en muestras microscópicas. En este trabajo se examinan distintas técnicas de microscopía óptica para la obtención de fotografías digitales de alta resolución.
Corbí, Hugo, Guardiola Bartolomé, José Vicente   +1 more
openaire   +2 more sources

Archeointensity Database and Geomagnetic Field Reference Curves for South America Over the Past 5 Millennia

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 3, March 2026.
Abstract The study of variations in geomagnetic field intensity over time and space is crucial to understand the evolution of the geodynamo and its interactions with the Earth's surface. In this work, we introduce the SAGEOMAG (South America GEOMAGnetic) database, a comprehensive and updated repository of geomagnetic field intensity records derived ...
Victor J. O. Marum, Filipe Terra‐Nova, Gelvam A. Hartmann, Erwan Thébault, Plinio Jaqueto, Wilbor Poletti, Ricardo I. F. Trindade   +6 more
wiley   +1 more source

Abordagens Geológica e Paleontológica nas Avaliações Oficiais em Âmbitos Nacional e Estadual (RJ)

Continentes, 2017
Avaliações tradicionais são uma ação que sempre esteve presente na escola; todavia, outro procedimento tem ganhado espaço: as avaliações externas, em larga escala. Dois exemplos são: ENEM e SAERJ- SAERJINHO.
Sarah Gonçalves Duarte
doaj  

Cambio Global y Geociencias

, 2021
Uno de los grandes retos, si no el mayor reto, al que se está enfrentando la Humanidad es el actual Cambio Global que estamos sufriendo de forma visible desde hace, al menos unos 20 años. Los sucesivos informes que lleva emitiendo el Grupo Intergubernamental de Expertos sobre el Cambio Climático (IPCC, sus siglas en inglés: https://www.ipcc.ch/) desde ...
openaire   +1 more source

The Asymmetric Hydrodynamic Structure of a Wind‐Dominated River Plume

Journal of Geophysical Research: Oceans, Volume 131, Issue 2, February 2026.
Abstract This study investigates the velocity and salinity structure of the large surface‐attached, low‐latitude, and microtidal plume of the Magdalena River (southern Caribbean Sea) during a period of high freshwater discharge and variable wind conditions. The plume was analyzed through observations at multiple transects along, across, and diagonal to
Ó. Álvarez‐Silva, M. Becker, R. P. Flores, F. Arévalo, P. Holtermann, Y. Cardona, C. Winter   +6 more
wiley   +1 more source

http://www.anuario.igeo.ufrj.br/anuario_2000/anuario_2000_v23_editorial.htm

Anuário do Instituto de Geociências, 2000
Ano 2000 Volume 23 Editor: Ismar de Souza Carvalho Editorial ISSN: 0101-9759 O objetivo do Anuário do Instituto de Geociências é a divulgação das atividades educacionais e científicas nos diferentes
Ismar de Souza Carvalho
doaj