Consulta: creatorFacets:"Bougault, Henri"
Registros recuperados: 38
Data/hora: 12/06/2024 09:52:23

Hydrography above the mid-atlantic ridge (33-degrees-40-degrees-n) and within the lucky-strike segment
Provedor de dados: 5
Autores: Wilson, Cara; Speer, Kevin; Charlou, Jean-luc; Bougault, Henri; Klinkhammer, Gary.
As part of the French-American Ridge Atlantic program the French-American Zero-Angle Photon Spectrometer and Rocks (FAZAR) cruise conducted water column studies between 33 and 40 degrees N along the Mid-Atlantic Ridge (MAR)) to detect hydrothermal activity and map its influence, This paper describes the large-scale hydrography within the axial valley, with particular emphasis on the hydrothermally active Lucky Strike segment (37 degrees 17'N). The FAZAR study area is affected be the presence of the Azores Current and Mediterranean Water (MW). Although the MW core has been mapped as far north as 50 degrees N off the ridge; the northern boundary Of the MW within the MAR in the FAZAR study area exists as a strong front south of the Azores platform. This front...
Tipo: Text
Ano: 1995
URL: http://archimer.ifremer.fr/doc/00069/18038/15586.pdf

Les nodules polymétalliques et la dépollution des eaux
Provedor de dados: 5
Autores: Pignet, G.; Martin, G.; Bougault, Henri.
Les eaux superficielles sont atteintes de plus en plus gravement par la pollution industrielle, alors que les besoins en eau pure augmentent. C'est pourquoi on est amené à utiliser pour la consommation des eaux de qualités variables contenant en particulier un certain nombre de micropolluants. Les essais présentés ici ont pour but de tester une méthode originale d'élimination de différents cations métalliques bivalents. [OCR NON CONTRÔLE]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/1979/publication-5396.pdf

Les encroûtements cobaltifères de Polynésie française
Provedor de dados: 5
Autores: Bougault, Henri; Saget, Philippe.
Amas sulfurés hydrothermaux, nodules et encroûtements ferromanganésifères constituent en l’état des connaissances les trois ressources minérales potentielles des « grands fonds » marins. L’évolution du contexte international pour l’accès aux matières premières depuis quelques années conduit naturellement à porter une attention à ces ressources potentielles sous-marines. Bien que les encroûtements ferromanganésifères puissent présenter la plus grande valeur en métal contenu [Ifremer, 2011], principalement en raison de leur concentration en cobalt, l’étude de ces encroûtements et de leur contexte n’ont pas fait l’objet, en France, d’autant d’investigations que les nodules de manganèse ou les amas sulfurés hydrothermaux. On se propose de résumer les...
Tipo: Text
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00069/18029/15560.pdf

Chemical systematics of an intermediate spreading ridge: The Pacific-Antarctic Ridge between 56 degrees S and 66 degrees S
Provedor de dados: 5
Autores: Vlastelic, Ivan; Dosso, Laure; Bougault, Henri; Aslanian, Daniel; Geli, Louis; Etoubleau, Joel; Bohn, Marcel; Joron, Jl; Bollinger, C.
Axial bathymetry, major/trace elements, and isotopes suggest:that the Pacific-Antarctic Ridge (PAR) between 56 degrees S and 66 degrees S is devoid of any hotspot influence. PAR (56-66 degrees 5) samples have in-average lower Sr-87/Sr-86 and Nd-143/Nd-144 and higher Pb-206/(204)pb than northern Pacific midocean ridge basalts (MORB), and also than MORE from the other oceans. The high variability of Pb isotopic ratios (compared to Sr and Nd) can be due to either a;general high mu (HIMU) (high U/Pb) affinity of the southern Pacific upper mantle or to a mantle event first recorded in time by Pb isotopes. Compiling the results of this study with those from the PAR between 53 degrees S and 57 degrees S gives a continuous view of mantle characteristics from south...
Tipo: Text
Ano: 2000
URL: https://archimer.ifremer.fr/doc/00000/10578/9396.pdf

Le leg 82 du programme international de forages océaniques profonds (I.O.D.P.) : croûte océanique "normale" ou "anormale" sur la ride médio-Atlantique ; propriétés géochimiques
Provedor de dados: 5
Autores: Bougault, Henri; Cande, S; Mills, W; Curtis, D; Neuser, R; Christie, D; Rideout, M; Etoubleau, Joel; Drake, N; Brannon, J; Weaver, B; Echols, D; Clark, M; Khan, Mj; Hill, I.
Tipo: Text
Ano: 1983
URL: http://archimer.ifremer.fr/doc/00311/42189/41490.pdf

The petrology, geochemistry, and mineralogy of north atlantic basalts : a discussion based on ipod leg 49
Provedor de dados: 5
Autores: Wood, D.a.; Varet, J.; Bougault, Henri; Corre, O.; Joron, J.l.; Treuil, M.; Bizouard, H.; Norry, M.j.; Hawkesworth, C.j.; Roddick, J.c.
Whole-rock geochemical data were obtained for 178 samples selected from the petrologically freshest parts of most of the flow units recovered from the nine holes. These data include 170 major element analyses (XRF) and 174 trace-element analyses (XRF and INAA). We include representative microprobe analyses of the primary minerals and fresh basaltic glasses (where present) in 40 selected samples. We also present 87Sr/88Sr ratios for 14 samples selected from the holes at 63"N. These analytical data, together with petrographic data obtained from the study of some 500 thin sections, have enabled us to establish a detailed lithostratigraphy for each basement section. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/1979/publication-5238.pdf

Shipboard precision weighing
Provedor de dados: 5
Autores: Boucher, Jean; Bougault, Henri; Martinais, J.
Weights of about 1 mg to 1 g have been measured on board a ship with a precision better than 0.5% on a routine basis using an electromagnetic balance. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1974
URL: http://archimer.ifremer.fr/doc/1974/publication-5154.pdf

Campagne RIDELENTE: Structure de la dorsale Atlantique - Hétérogénéité du manteau et hydrothermalisme
Provedor de dados: 5
Autores: Bougault, Henri; Appriou, P; Bienvenu, P; Cambon, Pierre; Charlou, Jean-luc; Collette, B; Donval, Jean-pierre; Dosso, Laure; Floch, G; Fouquet, Yves.
Tipo: Text
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00070/18105/15653.pdf

From intracratonic extension to mature spreading in back arc basins: Examples from the Okinawa, Lau, North Fiji basins
Provedor de dados: 5
Autores: 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

Ride médio-atlantique : variations géochimiques à âge zéro entre les açores et 22°N
Provedor de dados: 5
Autores: Bougault, Henri; Treuil, Michel.
The MAPCO cruise of the R.V. Jean-Charcot (October-November, 1979) sampled zero-age basalts along the Mid  Atlantic Ridge from the Azores triple junction to 24°N. Preliminary shipboard geochemical analyses together with previOusly collected data show that hygromagmaphile elements are not randomly distributed along the ridge. North from Hayes transform, the chondrite normalised diagrams of these elements show flat to enriched distributions for the most hygromagmaphile elements. South from this transform, these diagrams are systematically depleted for the most hygromagmaphile elements. These data are interpreted in terms of regional upper mantle heterogeneity. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/publication-5417.pdf

Major elements : analytical chemistry onboard and preliminary results
Provedor de dados: 5
Autores: Bougault, Henri.
In 1972, chemical analysis of rocks using a dispersive X-ray fluorescence system was shown to be practicable at sea during the "Gibraco cruise" of the R.V. Jean Charcot (Bougault and Cambon, 1973). The same equipment and techniques were used to perform analyses on Glomar Challenger during Leg 37. The aim of this report is to describe the instruments used, the basic routine operations, the problems encountered, and how they were solved. From the experience of analytical work onboard and the precision of the results which is discussed, some brief recommendations are made to IPOD for shipboard chemical analysis. The preliminary results obtained are discussed in terms of chemical units compared to lithological units defined onboard. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1977
URL: http://archimer.ifremer.fr/doc/1977/publication-4993.pdf

Comparaison géochimique et minéralogique entre la zone des dômes et la marge continentale
Provedor de dados: 5
Autores: Pautot, Guy; Hekinian, Roger; Bougault, Henri.
Nous avons reporté les valeurs des dosages en éléments-traces et les pourcentages en argiles pour essayer de dégager des éléments de comparaison entre la zone des dômes et le domaine de la marge continentale. Très schématiquement, nous avons effectué la division géographique suivante: - T 9, T 13, T 14 : dômes salifères ? - T 1, T 10 : bas de pente - T 4, T 7 : ride sédimentaire. [OCR NON CONTRÔLE]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1971
URL: http://archimer.ifremer.fr/doc/1971/publication-4906.pdf

Sur quelques datations du volcanisme alcalin de la ligne Açores-Gibraltar et leur contexte géodynamique
Provedor de dados: 5
Autores: Feraud, Gilbert; Bonnin, Jean; Olivet, Jean-louis; Auzende, Jean-marie; Bougault, Henri.
Ages of a few rocks sampled in three sites of the Azores-Gibraltar ridge have heen determined using the K/Ar method.For one site (Gorringe hank), both whole rock and separated mineral techniques have heen used: ages are compared and discussed. All the dated samples are younger than the adjacent ocean floor whose age is evaluated from the observed magnetic anomalies.For the Gorringe bank samples, ages do not coincide with the generally accepted age for the uplift of this portion of the ocean floor. [NOT CONTROLLED OCR]
Tipo: Text
Ano: 1977
URL: http://archimer.ifremer.fr/doc/1977/publication-5214.pdf

Leg 55, emperor seamounts : trace elements in transitional tholeiites, alkali basalts, and hawaiites-mantle homogeneity or heterogeneity and magmatic processes
Provedor de dados: 5
Autores: Cambon, Pierre; Bougault, Henri; Joron, J.l.; Treuil, M.
Three seamounts of the Emperor Seamount chain were sampled during Leg 55: Ojin seamount, Hole 430A, 37° 59.29 N 170° 35.86 E Nintoku seamount, Hole 432A, 41° 20.03 N 170° 22.74 E Suiko seamount, Hole 433A, 44° 46.60 N 170° 01.26 E Hole 433C, 44° 46.63 N 170° 01.23 E Oceanites, ankaramites, transitional tholeiites, alkali basalts, and hawaiites were recovered from these seamounts.The purpose of this study is the fractionation of trace elements according to their physicochemical properties and partition coefficient classification; fractionation of the elements observed in these samples is compared with their fractionation in mid-oceanic ridge tholeiites.Some preliminary conclusions are presented with regard to mantle heterogeneity or homogeneity and magmatic...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/publication-5273.pdf

X-Ray Spectrometric Analysis of Trace Elements in Rocks.Correction for Instrumental Interferences
Provedor de dados: 5
Autores: Bougault, Henri; Cambon, Pierre; Toulhoat, H.
Investigating trace element determination in rocks and taking into account possible instrumental interferences,it is shown that the general relationship between I (net peak intensity) and c (fluorescent element concentration) is (I - Io)M = Ac + B where M is the matrix effect correction factor and A is a constant proportional to the efficiency of excitation; B and Io correspond to the intensities due to, respectively , the scattering (especially, by the sample) of any instrumental interfering radiation, and a possible stray emisision by the instrument itself.Using this equation under optimized conditions allows interferences as high as 200 ppm (if expressed in equivalent concentration) to be compensated without any significant decrease regarding the...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1977
URL: http://archimer.ifremer.fr/doc/1977/publication-5179.pdf

Dorsale médio-océaniques : des fenêtres sur le manteau terrestre…
Provedor de dados: 5
Autores: Bougault, Henri; Dosso, Laure; Joron, Jean-louis.
Ce dossier retrace une enquête chimique passionnante qui révèle comment la connaissance de l’évolution de notre planète passe par une descente dans les dorsales médio-océanique, au cœur même des laves basaltiques qui s’y créent, à la recherche d’indices infimes mais révélateurs.
Tipo: Text
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00001/11242/7771.pdf

L'Hydrothermalisme océanique
Provedor de dados: 5
Autores: Bougault, Henri; Charlou, Jean-luc; Fouquet, Yves; Appriou, Pierre; Jean-baptiste, Philippe.
Tipo: Text
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00070/18101/15649.pdf

Atlantique nord : étude préliminaire des roches de la fracture Gibbs (53° Nord) et de la zone de fracture Açores-Gibraltar.
Provedor de dados: 5
Autores: Hekinian, Roger; Bougault, Henri; Pautot, Guy.
[OCR NON CONTRÔLE]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1973
URL: http://archimer.ifremer.fr/doc/1973/publication-5059.pdf

Hydrothermalisme oceanique, exploration, methodologie et instrumentation associee
Provedor de dados: 5
Autores: Bougault, Henri; Charlou, Jean-luc; Donval, Jean-pierre; Fouquet, Yves; Pelle, H.
Responsible for large exchanges between the Ocean and the Lithosphere, oceanic hydrothermalism covers wide scientific domains, from the ocean chemistry to metallogeny. The exploration covers all scales, from the hydrothermal site to the Mid-oceanic ridge system. Modern bathymetry and imagery are required. Physical and chemical anomalies created in the ocean are used to detect and map its distribution. A specific effort in the field of ROV (Remote Operated Vehicle) is needed to acquire data at the corresponding working scale.
Tipo: Text
Palavras-chave: ISE; East Pacific Rise A; Mid Atlantic Ridge Oceanic crust Cartography Marine technology Underwater exploration Unmanned vehicles Imagery Bathymetry Hydrothermal activity.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/1990/acte-1159.pdf

Campagne HYDROFAST: Etudes quantitatives de l'activité hydrothermale sur la Ride-Est Pacifique à 13°N
Provedor de dados: 5
Autores: Bougault, Henri; Appriou, P; Birolleau, A; Charlou, Jean-luc; Crane, K; Etoubleau, Joel; Fouquet, Yves; Gente, P; Harmegnies, Francois; Landure, Jean-yves; Le Noac'H, A; Pelle, Henri; Sichler, Bertrand; Voisset, Michel; Watremez, Pierre; Vaslet, N; Jean Baptiste, P.
Tipo: Text
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00070/18104/15652.pdf

Alteration, fractional crystallization, partial melting, mantle properties from trace elements in basalts recovered in the north atlantic
Provedor de dados: 5
Autores: Bougault, Henri; Joron, Jean-louis; Treuil, Michel.
.-Alkali metals prove to be very sensitive to alteration process even if this process is moderate. It is very difficult to use these elements to trace magmatic processes since their concentration may Vary within an homogeneous "unaltered" unit. From all the basaltic units investigated, a classification of "low partition coefficient" elements is presented (Sc, Ti, V, Y, Zr, Nb, La-Tb , Hf, Ta, Th) . The incompatible elements ratios (Y/Tb, Zr/Hf, Nb/Ta) are constant in the samples studied and are nearly equal to the same ratios in chondrites. This is consistent with the existence of an homogeneous primordial mantle at the scale of the North Atlantic, compatible with a chondritic composition of the earth. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/1979/publication-5253.pdf

Mid-Atlantic Ridge : zero-age geochemical variations between Azores and 22°N
Provedor de dados: 5
Autores: Bougault, Henri; Treuil, M.
The MAPCO cruise of RV J. Charcot sampled zero-age basalts along the Mid-Atlantic Ridge from the Azores Triple Junction to 24 N. Preliminary shipboard geochemical analyses together with earlier data show that some trace elements are not randomly distribued along the ridge. The latitude of the Haves transform delineate two regions of rare earth element distribution : north from Hayes, is flat to light rare (or equivalent) enriched : south from Hayes, is light rare earth (or equivalent) depleted. These findings indicate large scale heterogeneity of the upper mantle. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/publication-5418.pdf

Trace elements : fractional crystallization and partial melting process, heterogeneity of upper mantle material
Provedor de dados: 5
Autores: Bougault, Henri; Cambon, Pierre; Joron, J.; Treuil, M.
From a study of trace elements, including first transition series elements and low parition coefficient elements or so-called hygromagmatophyle elements (Treuil and Varet, 1973 ; Treuil and Joron, 1976),  we will try to establish the three fundamental parameters (mantle material, partial melting, and crystallization) which influence the formation of basalts recovered during Leg 46. Data are presented in connection with shipboard study ; a tentative interpretation is given taking into account our present knowledge of the behavior of trace elements during magmatic processes and comparing the results of FAMOUS, Leg 37 and Leg 45. We ask the reader to look at our Leg 45 report (Bougault. et al., 1978) to gain information about analytical procedures and...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1978
URL: http://archimer.ifremer.fr/doc/1978/publication-5249.pdf

Découverte par submersible de sulfures polymétalliques massifs sur la dorsale du Pacifique oriental, par 21°N (projet "Rita")
Provedor de dados: 5
Autores: Francheteau, Jean; Needman, David; Choukroune, Pierre; Juteau, Thierry; Seguret, Michel; Ballard, Robert D.; Fox, Jeffery; Normark, William; Carranza, Arturo; Cordoba, Diego; Guerrero, José; Rangin, Claude; Bougault, Henri; Cambon, Pierre; Hekinian, Roger.
Massive zinc, copper and iron sulfide ore deposits have been found at the axis of the East Pacific Rise. Although several investigators had predicted their presence on the deep-ocean floor, there was no supporting observational evidence. The East Pacific Rise deposits represent an appealing modern analogue of Cyprustype ores associated with ophiolitic rocks on land. They contain up to about 29% zinc metal and up to at least nearly 3% metallic copper. Their discovery will provide a new focus for deep-sea exploration, leading to new assessments of the concentration of noble metals in the upper layers of the oceanic crust. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1978
URL: http://archimer.ifremer.fr/doc/1978/publication-5388.pdf

Tholeiites, basaltic andesites, and andesites from leg 60 sites : geochemistry, mineralogy, and low partition coefficient elements
Provedor de dados: 5
Autores: Bougault, Henri; Maury, R.c.; El Azzouzi, M.; Joron, J.l.; Cotten, J.; Treuil, M.
This chapter presents major oxide and trace element determinations of igneous whole-rock compositions from sites drilled during Leg 60 and electron microprobe mineral and glass analyses of samples from Sites 454 and 458.  Interarc basin basalts from the Mariana Trough (Sites 454 and 456) are similar in all respects to depleted mid-ocean ridge basalts. Basaltic andesites and andesites from Site 458 (Mariana fore-arc region) are more depleted than mid-ocean ridge basalts and show different geochemical behavior for Zr-, Hf, and Ti when compared on an extended Coryell- Masuda plot. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/publication-5308.pdf

The primordial chondritic nature and large-scale heterogeneities in the mantle: evidence from high and low partition coefficient elements in oceanic basalts
Provedor de dados: 5
Autores: Bougault, Henri; Joron, J.l.; Treuil, M.
Large-scale heterogeneities in the mantle are investigated through trace elements measured in oceanic basalts from different locations in the Atlantic and Pacific oceans.The study relies upon the physico-chemical properties of the elements and their classification according to their partition coefficients. High partition coefficient elements (Co, Ni; Cr) have concentrations in peridotite that are not sensitive to solidliquid equilibrium (partial melting); the mantle should therefore be homogeneous with respect to these elements.The ratios of elements that have equal or very similar low partition coefficients (Y/Tb, Zr/Hf and Nb/Ta) are constant in all samples studied, despite their large concentration range.These ratios are equal to chondritic ratios and...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/publication-5281.pdf

Fast and slow spreading ridges: structure and hydrothermal activity - Ultramafic Topographic Highs and CH4 output
Provedor de dados: 5
Autores: Bougault, Henri; Charlou, Jean-luc; Fouquet, Yves; Needham, Hubert D; Vaslet, Nathalie; Appriou, Pierre; Jean Baptiste, Philippe; Rona, Peter A; Dmitriev, Leonid; Silantiev, Sergei.
Tipo: Text
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00070/18116/15664.pdf

Trace elements in basalts from 23°n and 36°n in the atlantic ocean: fractional crystallization, partial melting, and heterogeneity of the upper mantle
Provedor de dados: 5
Autores: Bougault, Henri; Treuil, M.; Joron, J.l.
From a study of first-transition series trace elements and low-partition-coefficient trace elements or so-called hygromagmatophyle elements (Treuil and Varet, 1973; Treuil and Joron, 1976), we will try to define the relative importance of the three fundamental parameters- mantle source composition, extent of partial melting, and crystal fractionation-which bear on the formation of basalts recovered during Leg 45.We relate the presented data to the results of shipboard study (Chapters 7 and 8, this volume) and then give a tentative interpretation, taking into account our present knowledge of the behavior of trace elements during magmatic processes of FAMOUS and Leg 37 results. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1978
URL: http://archimer.ifremer.fr/doc/1978/publication-5204.pdf

From intracratonic extension to nature spreading in back arc basins: Examples from the Okinawa, Lau and, North Fiji basins
Provedor de dados: 5
Autores: Auzende, Jean Marie; Boespflug, X; Bougault, Henri; Dosso, Laure; Foucher, Jean-paul; Joron, J-l; 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 evidence 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 compared to the East Pacific Ridge. The Lau basin displays an intermediate stage with a complex system of accretionary ridges. This difference in the evolution stage is translated in the...
Tipo: Text
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00268/37893/35974.pdf

Distribution of first series transition metals in rocks recovered during DSDP Leg 22 in the northeastern indian ocean
Provedor de dados: 5
Autores: Bougault, Henri.
Ti, V, Cr, Fe, Co, Ni, Cu, and Zn have been analyzed from Sites 211, 213, 214, 215,and 216 of DSDP Leg 22 of the Glomar Challenger in the northeastern Indian Ocean. According to these trace elements, three different types of source material are broadly defined : the basin floor basalts with a composition similar to tholeiites from mid-oceanic ridges,  the basalts and the differentiated rocks from the Ninetyeast Ridge, and the diabase and amphibolite from Site 211. In this paper the notion of stabilization energy in a ligands field is summarized, analytical techniques used are described, and certain conclusions based on the results are presented. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1974
URL: http://archimer.ifremer.fr/doc/1974/publication-5145.pdf

Activité hydrothermale et structure axiale des dorsales Est-Pacifique et médio-Atlantique
Provedor de dados: 5
Autores: Bougault, Henri; Charlou, Jean-luc; Fouquet, Yves; Needham, David.
Tipo: Text
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00070/18115/15663.pdf

Massive deep-sea sulphide ore deposits discovered on the East Pacific Rise
Provedor de dados: 5
Autores: Francheteau, Jean; Needham, H.d.; Choukroune, P.; Juteau, T.; Seguret, M.; Ballard, R.d.; Fox, P.j.; Normark, W.; Carranza, X; Cordoba, D.; Guerrero, J.; Rangin, C.; Bougault, Henri; Cambon, Pierre; Hekinian, Roger.
Massive ore-grade zinc, copper and iron sulphide deposits have been found at the axis of the East Pacific Rise.Although their presence on the deep ocean-floor had been predicted there was no supporting observational evidence. The East Pacific Rise deposits represent a modern analogue of Cyprus-type sulphide ores associated with ophiolitic rocks on land.They contain at least 29% zinc metal and 6% metallic copper.Their discovery will provide a new focus for deep-sea exploration, leading to new assessments of the concentration of metals in the upper layers of the oceanic crust. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/1979/publication-5278.pdf

Contribution des éléments de transition à la compréhension de la génèse des basaltes océaniques. Analyse des éléments traces dans les roches par spectrométrie de fluorescence X
Provedor de dados: 5
Autores: Bougault, Henri.
En insistant sur les limites de la définition d'un élément trace et sur les hypothèses nécessaires à l'élaboration des modèles classiques de fusion partielle et de cristallisation fractionnée, le premier chapitre sert d'introduction générale. Le deuxième chapitre traite des propriétés des éléments de transition vis à vis des partages minéraux - liquides silicatés. Les chapitres III, éléments à forts coefficients de partage, et IV, éléments à faibles coefficients de partage, sont consacrés à l'interprétation des données en termes de géochimie comparée, processus magmatiques et hétérogénéité du manteau. Le chapitre V présente les données brutes relatives à chaque campagne. L'analyse des éléments traces par spectrométrie de fluorescence X est traitée au...
Tipo: Text
Ano: 1980
URL: http://archimer.ifremer.fr/doc/00034/14512/11841.pdf

Methane anomalies over TAG hydrothermal field on Mid Atlantic Ridge
Provedor de dados: 5
Autores: Charlou, Jean-luc; Rona, P; Bougault, Henri.
Tipo: Text
Ano: 1987
URL: http://archimer.ifremer.fr/doc/00070/18107/15656.pdf

Evidence de la cristallisation fractionnée au niveau d'une ride médio-océanique: co, ni, cr, famous, leg 37 du dsdp
Provedor de dados: 5
Autores: Bougault, Henri.
The concentrations of high partition coefficient elements Co, Ni, Cr do not Vary or Vary little in the solid phase and the liquid phase as partial melting proceeds.For nickel and cobalt concentrations do not depend on the nature of the solid and the model of partial melting chosen. Quantitatively, the calculated value of the concentrations of these elememts in the liquid agrees with the concentrations found for undifferentiated tholeiitic samples.In so far, large variations of chromium and nickel found in oceanic tholeiites evidence the fractional crystallization process. Cobalt on one hand, nickel and chromium on the other give constraint in regard of the proportions of principal minerals crystallizing. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1977
URL: http://archimer.ifremer.fr/doc/1977/publication-5218.pdf

Trace element and isotopic (Sr, Nd) geochemistry of volcanic rocks from the Lau Basin
Provedor de dados: 5
Autores: Boespflug, Xavier; Dosso, Laure; Bougault, Henri; Joron, Jean-louis.
Rock samples have been dredged clming S0-35 and SEAPSO JV cruises (1984 and 1985) from cliJTemnl spreading ridges in lhe Lau Basin, soulh-weslern Pacific. They were analyzed for major and lrace elemenls and isotopic ralios (Sr, Nd). Nmlhem Lau Basin samples show N-MORB type characlerislics, bolh in major andlrace elemenls, whereas soulhern Lau Basin ones are differenlialed and show significanl Ta-Nb negalive anomalies in lheir extended REE pallerns, which is characlerislic of subcluclion zones.lsolopic ralios (Sr, Nd) are quile helerogeneous and inlermediale bel ween MORB and island arc values. The norlhern Lau Basin Ridge has geochemical characlerislics suggeslive ofmedio-oceanic lype spreading, whemas lhe soulhem LauBasin Ridge (Valu Pa Ridge) wilh ils...
Tipo: Text
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00119/23059/20894.pdf

First transition series elements : fractional crystallization and partial melting
Provedor de dados: 5
Autores: Bougault, Henri.
From a study of the first transition series elements we will try to define the pattern of fractional crystallization and partial melting. Results are discussed hole by hole in connection with lithological description and major element analysis. and element by element in term of fractional crystallization or partial melting using their partition coefficients. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1977
URL: http://archimer.ifremer.fr/doc/1977/publication-4992.pdf

Mid-Atlantic Ridge: hydrothermal Fluxes at the Azores Triple Junction
Provedor de dados: 5
Autores: Bougault, Henri; German, C; Miranda, M; Marflux/atj, Participants.
Tipo: Text
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00070/18112/15660.pdf