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Registros recuperados: 33
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A influência da mineralogia na evolução micromorfológica do colapso em saprólito e latossolo. Infoteca-e
CARDOSO, F. B. da F.; MARTINS, E. de S.; CARVALHO, J. C. de..
Resumo: Este trabalho mostra a aplicação de técnicas modernas de micromorfologia e mineralogia no desenvolvimento de um modelo evolutivo do colapso em solos tropicais profundamento intemperizados. Abstract: This work exibition the application of modern techniques of micromorphology and mineralogy in the development of an evolutionary model of the collapse in deeply weathering tropical soils.
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: ECOSOL170; Mineralogia; Solo; Micromorfologia; Geoquímica; Colapso; Cerrado; Análise do solo; Mineralogy; Soil; Micromorphology; Geochemistry; Collapse; Soil testing.
Ano: 2002 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/567945
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Age, geochemical characteristics and petrogenesis of Cenozoic intraplate alkaline volcanic rocks in the Bafang region, West Cameroon ArchiMer
Ngongang, Nicaise Blaise Tchuimegnie; Kamgang, Pierre; Chazot, Gilles; Agranier, Arnaud; Bellon, Herve; Nonnotte, Philippe.
The origin of the volcanism in the Cameroon Volcanic Line and the nature of its mantle sources are still highly controversial. We present major and trace element compositions as well as Sr-Nd-Pb-Hf isotopic results on mafic and intermediate lavas from the Bafang area in the central part of the Cameroon Volcanic Line. The lavas range from basanites and basalts to hawaiites and mugearites with an alkaline affinity and were emplaced between 10 and 6 Ma ago. The evolution from basalts and basanites to more differentiated rocks involved fractionation of olivine, clinopyroxene and Fe-Ti oxides, but the isotopic compositions show that crustal contamination processes affected some magmas during their ascent in the crust. Basalts and basanites originated from a...
Tipo: Text Palavras-chave: Cameroon Volcanic Line; Geochemistry; Magmatism; Mantle source.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00221/33255/32158.pdf
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Caractérisation physique et géochimique d'hydrates de gaz d'environnements géologiques différents. Apport des techniques de Diffraction X Synchrotron et de Spectroscopie Raman. Contribution à l'étude de leur origine, formation et stabilité sur les marges ArchiMer
Bourry, Christophe.
Clathrate hydrates are inclusion compounds consisting of an ice-like network of water cages surrounding occluded guest molecules. They occur beneath the oceans and in polar regions, where low temperature and high pressure conditions prevail. Natural gas hydrates, mainly composed of methane occur worldwide and may contain huge natural gas amount, but they can also play an important role in continental slope stability or climate change, due to the potentially enormous "greenhouse" feedback effect of methane. The knowledge of their occurrence in the natural environment, their physical, chemical or thermodynamical properties is essential to prevent geohazards, to anticipate their role in climate change or to develop technologies to take advantage of this...
Tipo: Text Palavras-chave: X Ray synchrotron diffraction; Raman spectroscopy; Geochemistry; Gas hydrate; Eau interstitielle; Diffraction X synchrotron; Spectroscopie Raman; Géochimie; Hydrate de gaz.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-6236.pdf
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Características oceanográficas y geoquímicas del Golfo de Guayaquil durante noviembre de 1994 OceanDocs
Cuadra, T. de la; Chalén, X.; Pérez, P.; Macías, P.; Ortega, D.; Ormaza, F..
Las masas de agua encontradas a partir de las variables de estado, indican una contribución muy pobre de Agua Subtropical Superficial (ASTS), mientras que las mayores contribuciones fueron de Agua Tropical Superficial (ATS). Parámetros como la temperatura y la salinidad determinaron un calentamiento del océano, tanto a nivel superficial como subsuperficial, lo cual sería una consecuencia de los procesos de redistribución de calor del océano.Esta dinámica ocasionaría anomalías del orden de los 30 metros para el caso de la profundidad de la termoclima y 2°C para el caso de la TSM. En el plancton se registraron valores mayores a 5000 larvas de peces/10 m2. La menor cantidad (260 larvas/10 m2) se registró hacia el norte del Golfo, observándose al mismo tiempo...
Tipo: Journal Contribution Palavras-chave: Oceanographic data; Geochemistry; Salinity data; Plankton; Organic matter; Plankton; Organic matter; Geochemistry; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_5387; Http://aims.fao.org/aos/agrovoc/c_24848.
Ano: 1994 URL: http://hdl.handle.net/1834/3080
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Caracterização física e aspectos geoquímicos de dois solos da Península Keller, Ilha Rei George, Antártica Marítima. Infoteca-e
ALBUQUERQUE FILHO, M. R.; SCHAEFER, C. E. G. R.; SIMAS, F. B. N.; PEREIRA, V. V.; GUERRA, M. B. B..
0
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E) Palavras-chave: Mineralogia; Solo; Geoquímica; Análise do solo; Mineralogy; Soil; Geochemistry; Soil testing.
URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/569491
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Climatic evolution of the central equatorial Pacific since the Last Glacial Maximum ArchiMer
Seo, Inah; Lee, Yuri; Lee, Yong Il; Yoo, Chan Min; Hyeong, Kiseong.
This paper investigates paleoceanographic changes at a central equatorial Pacific site (6 degrees 40N, 177 degrees 28W) since the last glacial maximum using planktic foraminifera assemblages, together with the oxygen isotope (O-18) and Mg/Ca compositions of three species (Globigerinoides sacculifer, Pulleniatina obliquiloculata, and Globorotalia tumida) that dwell in the mixed layer, upper thermocline, and lower thermocline, respectively. While the Mg/Ca-derived temperatures of the mixed layer and lower thermocline varied within a narrow range from 18 ka onward, the upper thermocline temperature increased by as much as 3 degrees C during the last deglaciation (18-12 ka) with a simultaneous decrease of O-18. These changes are best explained by an enhanced...
Tipo: Text Palavras-chave: Planktic foraminifera; Geochemistry; Micropaleontology; Paleoceanography; Intertropical Convergence Zone; Last deglaciation.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00496/60721/65271.pdf
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Comportement chimique et geochimique des elements a l'état de traces dans l''estuaire de la Seine: Une synthese des resultats ArchiMer
Guegueniat, P.
Five topics are developed in this synthesis: (1) multi elements analysis in geochemistry; (2) iron geochemical behavior; (3) complexing properties of waters; (4) copper behavior in estuarine waters; (5) impact of sediment dynamics on dissolved metals concentration.
Tipo: Text Palavras-chave: Geographical distribution; Radiochemistry; Brackishwater pollution; Sediment dynamics; Dissolved chemicals; Heavy metals; Geochemistry; Physicochemical properties; Trace elements.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1290.pdf
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Determination of rare earth elements in geological samples using the agilent SVDV ICP-OES. Repositório Alice
AMARAL, C. D. B. do; MACHADO, R. C.; BARROS, J. A. V. de A.; VIRGILIO, A.; SCHIAVO, D.; NOGUEIRA, A. R. de A.; NOBREGA, J. de A..
2016
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Geochemistry; Mineral.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1051472
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Diffusion induced Li isotopic fractionation during the cooling of magmatic rocks: The case of pyroxene phenocrysts from nakhlite meteorites ArchiMer
Beck, Pierre; Chaussidon, M; Barrat, J.a.; Gillet, Ph.; Bohn, Marcel.
Ion-microprobe was used to measure Li abundances and isotopic compositions in pyroxenes from three Martian meteorites belonging to the nakhlite family. The profiles performed across augite crystals from Northwest Africa 817 show a large isotopic zoning from crystal cores (delta Li-7 similar to 0 parts per thousand) to rims (delta Li-7 similar to +20 parts per thousand) while Li abundances are almost constant (similar to 9.2 mu g/g). Unlike NWA 817, the pyroxene studied in the Miller Range 03346 nakhlite shows a zoning in Li abundance, with concentrations increasing from similar to 2.5 mu g/g in the core to similar to 9 mu g/ g in the rim. The augite rim (delta Li-7 = +7 parts per thousand) is slightly enriched in Li-7 with regard to the core (delta Li-7 =...
Tipo: Text Palavras-chave: Magma; Pyroxene; Lithium; Geochemistry; Mars planet; Isotopic composition.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1955.pdf
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Estudio geoquímico de los sedimentos en el Canal de Jambelí OceanDocs
Jácome de Solórzano, M.; Llanos de Bonilla, L..
Se presenta las características geoquímicas del Canal de Jambelí en base al análisis de 41 muestras de sedimentos del fondo marino, obtenidas durante marzo y junio de 1986 (Fig.1). Se identifica la presencia de dos dominios de sedimentación, el uno de tipo fluvial y el otro marino; así mismo una posible tendencia de avance del sedimento fluvial sobre el sedimento marítimo. Se establece además que la concentración de los constituyentes orgánicos se encuentran dentro de rangos normales y guarda relación con la textura del sedimento.
Tipo: Journal Contribution Palavras-chave: Geochemistry; Sediments; Geochemistry; Http://aims.fao.org/aos/agrovoc/c_24848.
Ano: 1987 URL: http://hdl.handle.net/1834/2131
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Evaluación geoquímica en la fase sedimentaria de ecosistemas costeros del Estado de Sonora, México OceanDocs
Villalba, A.I.; Ortega Romero, P.; De la O Villanueva, M..
Se elaboró este trabajo en los cuerpos lagunares Guásimas, Algodones y Lobos y contribuir, de esta forma, al conocimiento geológico marino de los sistemas costeros del litoral de Sonora.
Tipo: Journal Contribution Palavras-chave: Evaluation; Geochemistry; Sediments; Coastal lagoons; Evaluation; Geochemistry; Coastal lagoons; Http://aims.fao.org/aos/agrovoc/c_2736; Http://aims.fao.org/aos/agrovoc/c_24848; Http://aims.fao.org/aos/agrovoc/c_1697.
Ano: 1989 URL: http://hdl.handle.net/1834/2159
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From intracratonic extension to mature spreading in back arc basins: Examples from the Okinawa, Lau, North Fiji basins ArchiMer
Auzende, Jean-marie; Boespflug, Xavier; Bougault, Henri; Dosso, Laure; Foucher, Jean-paul; Joron, Jean-louis; Ruellan, Etienne; Sibuet, Jean-claude.
Three cruises (POP 1, SEAPSO 3 and SEAPSO 4) carried out during the "Tour du Monde" of the R.V. Jean Charcot allow us to obtain new structural and geochemical data for the Okinawa, North Fiji and Lau basins. Taken together, the structural and geochemical data illustrate a difference in evolution stages of these sites. The less evolved stage is represented by the Okinawa basin, where accretion is evidenced only by volcanic intrusion into a thinned continental crust. The most evolved stage is illustrated in the North Fiji basin, where the present-day accretion can be directly compm·ed to the East Pacific Ridge. The Lau basin displays an intem1ediate stage with a complex system of accretionary ridges. This difference in the evolution stage is translated in...
Tipo: Text Palavras-chave: Ouest Pacifique; Bassins arriere arc; Structure; Accretion; Geochimie; West Pacific; Back arc basins; Structure; Accretion; Geochemistry.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00119/23058/20893.pdf
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Geochemistry of brazilian soils: present situation. Repositório Alice
PEREZ, D. V.; MANZATTO, C. V.; ALCÂNTARA, S. de; WASSERMAN, M. A. V..
2010
Tipo: Capítulo em livro científico (ALICE) Palavras-chave: Geochemistry.
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/handle/doc/919688
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Hydrologie, sédimentaire et géochimie de l'oued Tinja (Tunisie septentrionale OceanDocs
Ben Gharali, A.; Ouakad, M.; Gueddari, M..
L'oued Tinja relie la garaet Ichkeul à la lagune de Bizerte laquelle communique avec la mer Méditerranée par un long goulet. Les eaux de cet oued dépendent à la fois des apports saisonniers des eaux marine et douce et présente de ce fait, des salinités très fluctuantes. L'important réseau hydrographique associé au plan d'eau de l'Ichkeul (avec un bassin versant très important d'environ 2080 km2) est sujet à de nombreux aménagements hydrauliques, notamment la construction de barrages de retenues d'eau douce. Ces derniers sont susceptibles de perturber les caractéristiques hydrologiques, sédimentologiques et géochimiques du système laguno-lacustre (lagune de Bizerte et garaet Ichkeul) et d'entamer par voie de conséquence sa diversité et sa richesse...
Tipo: Journal Contribution Palavras-chave: Environmental impact; Geochemistry; Hydrology; Quality; Sediment analysis; Species diversity.
Ano: 2008 URL: http://hdl.handle.net/1834/4270
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Hydrologie, sédimentologie et géochimie de l'oued tinja (Tunisie septentrionale) OceanDocs
Ben Garali, A.; Ouakad, M.; Gueddari, M..
L'oued Tinja relie la garaet Ichkeul à la lagune de Bizerte laquelle communique avec la mer Méditerranée par un long goulet. Les eaux de cet oued dépendent à la fois des apports saisonniers des eaux marine et douce et présente de ce fait, des salinités très fluctuantes. L'important réseau hydrographique associé au plan d'eau de l'Ichkeul (avec un bassin versant très important d'environ 2080 km2) est sujet à de nombreux aménagements hydrauliques, notamment la construction de barrages de retenues d'eau douce. Ces derniers sont susceptibles de perturber les caractéristiques hydrologiques, sédimentologiques et géochimiques du système laguno-lacustre (lagune de Bizerte et garaet Ichkeul) et d'entamer par voie de conséquence sa diversité et sa richesse...
Tipo: Journal Contribution Palavras-chave: Marine sciences; Quality; Species diversity; Geochemistry; Environmental impact; Hydrology; Freshwater lagoons; Sediment analysis.
Ano: 2008 URL: http://hdl.handle.net/1834/4248
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L'argent (Ag, nanoAg) comme contaminant émergeant dans l'Estuaire de la Gironde : évaluations scientifiques et gouvernance des risques ArchiMer
Salles, Denis; Roumezi, Alexis; Lanceleur, Laurent; Schaefer, Jorg; Petit, Jerome; Blanc, Gerard; Coynel, Alexandra; Chiffoleau, Jean-francois; Auger, Dominique.
This article presents the results of multidisciplinary research (geochemistry, sociology) into the increasing concentrations of silver (Ag and nanoAg) in the environment and their potential impact on aquatic environments. We investigate simultaneously the risk of contamination of these environments by silver and the process of the social and political construction of this risk by water managers, health authorities, agencies and committees responsible for expert evaluations, environmental associations, and potential users of silver or nano-silver. Four updated models of risk construction allow us to understand the logic of arguments mobilized at this stage of the emerging risk. This interdisciplinary cooperation opens up possibilities for dealing with some...
Tipo: Text Palavras-chave: Environment; Estuaries; Geochemistry; Interdisciplinary communication; Nanotechnology; Risk assessment; Risk management; Silver; Sociology; Water pollutants.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00156/26736/24939.pdf
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Late Holocene vegetation dynamics and lake geochemistry at Laguna Miranda, XI Region, Chile RChHN
HABERLE,S. G.; SZEICZ,J. M.; BENNETT,K. D..
Palynological and geochemical analysis of late Holocene lake sediments and dendrochronological analysis of Pilgerodendron in a volcanically active region of southern Chile reveal the long-term impact of a series of tephra fall events and tectonic activity on lake sedimentation and local vegetation. An upper 0,75 m core overlaps with a 4,35 m long Livingstone piston core to give a 4,60 m long sediment record, extending back to 4800 yr BP. Geochemical data shows the shift from allogenic dominance to authigenic and biogenic dominance as waterlogged soils developed within the catchment. This is presumed to have occurred under the influence of continued addition of nutrients to the catchment from tephra deposition and the associated high sedimentation rates....
Tipo: Journal article Palavras-chave: Hudson Volcano; Tephra; Pollen; Geochemistry; Dendrochronology.
Ano: 2000 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400010
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Les nodules du pacifique central dans leur environnement géologique CAMPAGNES COPANO - 1979 ArchiMer
Pautot, Guy; Hoffert, Michel.
The cruises named COPANO have been undertaken during the summer 1979 on the R. V. Le Suroit of the CNEXO, as a part of an international research program I.C.I.M.E. The objective of this project was to study relatively small zones (a few km2) and to establish a relationship between characteristics of the manganese nodules and their environment. During the COPANO cruises, five zones have been studied: two in the northern Pacific, two in the southern Pacific and finally one in the equatorial Pacific. All the zones are centered on the longitude 134° Wand therefore their symmetry to the highly productive equatorial zone may be tested. As one of the results of the cruises is the relation between nodules and the bottom soil, established by sediment-sampling and a...
Tipo: Text Palavras-chave: Géochimie; Cartographie; Geologie; Fonds marin; Environnement; Nodules; Geochemistry; Mapping; Structural geology; Environmental impact; Nodule.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/rapport-1144.pdf
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Li isotopic variations in single pyroxenes from the Northwest Africa 480 shergottite (NWA 480): a record of degassing of Martian magmas? ArchiMer
Beck, Pierre; Barrat, J; Chaussidon, M; Gillet, P; Bohn, Marcel.
Lithium abundances and isotopic compositions were measured by ion microprobe in individual grains of pyroxene, and in a few maskelynites and Ca-phosphates grains, from the Martian meteorite Northwest Africa 480 (NWA 480). In pyroxenes Li abundances are nearly constant from core to rim with concentrations ranging between 3 and 4 mug/g. In contrast, a significant isotopic zoning is observed with delta(7)Li values increasing within single crystals from similar to -17parts per thousand in the core to similar to +10parts per thousand in the rim, most of the variability being observed in the core. Plagioclase (now maskelynite) and phosphate crystals, which co-crystallized with the pyroxene rims, display similar delta(7) Li values. Because of the incompatible...
Tipo: Text Palavras-chave: Mars planet; Magma; Pyroxene; Isotopic composition; Lithium; Geochemistry.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-735.pdf
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MARSITECruise Report. 2014 1st ‐ 13th November ‐ Leg 2 ArchiMer
Ruffine, Livio; Geli, Louis.
Summary of Marsitecruise The scientific cruise MARSITECRUISE of R/V Pourquoi pas? Took place from 28 October to 17 November 2014. Part of the operations were carried out within the frame of the MARSITE programme supported by the European Union, which aims at better understanding the behaviour of the North Anatolian fault in the Marmara sea in view of improving the assessment of the seismic hazard weighing on the Istanbul region. Coordinated by the Observatory of the University of Kandilli (KOERI, based in Istanbul), MARSITE groups 23 partners and includes different components: land, spatial and marine. The marine operations of the programme were coordinated by Ifremer and conducted using Italian (R/V Urania) and French (R/V Pourquoi pas?) naval means....
Tipo: Text Palavras-chave: Sea of Marmara; Geochemistry; Seismicity.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00453/56480/58177.pdf
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