Consulta: creatorFacets:"Pujos, M"
Registros recuperados: 8
Data/hora: 01/06/2024 08:20:55

Late quaternary paleoceanography of the French Guiana continental shelf: Clay-mineral evidence
Provedor de dados: 5
Autores: Pujos, M; Latouche, C; Maillet, N.
Marine muds deposited on the French Guiana coast mostly originate in the Amazon. Recent sediments are composed of (a) illite (33 %) and chlorite (13 %) of Andean mountain origin; and (b) kaolinite (28 %) and smectite (26 %), principally from the Amazonian lowlands but also from the Guiana Shield. In the coastal mud prism, high-resolution seismic profiles, together with sedimentological, micropaleontological and soil engineering studies, supplemented by C-14 dates, permitted a stratigraphic interpretation of eight cores. Three episodes have been determined on the basis of clay-mineral variations related to Amazonian lowland, Andean and Guiana shield sources. The older episodes 3 (3000-1700 y BP) and 2 (1700-1000 y BP) are predominantly characterized by...
Tipo: Text
Palavras-chave: Late quaternary; French Guiana; Shelf; Clay minerals; ENSO.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00094/20506/18175.pdf

Les minéraux lourds des sables du littoral de la Guyane française : bilan sur l’origine des dépôts de la plate-forme des Guyanes
Provedor de dados: 5
Autores: Pujos, M; Pons, Jc; Parra, M.
The distribution of heavy minerals on beaches and beach ridges sands of French Guiana shows three distinct suites from East to West: amphibole (largely dominant), staurolite, epidote and pyroxene off the Cayenne region, tourmaline and amphibole mainly off the Kourou-Mana, garnet, staurolite and tourmaline off the Mana-Maroni. A very good continuity exists between the assemblages of heavy minerals from the catchment area parent-rocks, the fluviatile sediments, the coastal zone and the shelf. The results of this study indicate and strengthen a local origin for the sandy sediments and do not support a possibility of an Amazonian source.
Tipo: Text
Palavras-chave: Guyane française; Plages; Cordons sableux; Minéraux lourds; French Guiana; Beaches; Beach ridges sands; Heavy minerals.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00291/40271/38643.pdf

Le comblement de la ria de Gernika (golfe de Gascogne) à l'Holocène terminal
Provedor de dados: 5
Autores: Pascual, A; Weber, O; Rodriguez-lazaro, J; Jouanneau, Jm; Pujos, M.
A study of the recent sedimentation of the ria de Gernika (Bay of Biscay) is undertaken to characterise different steps of its Holocene filling. Sedimentological and micropalaeontological analysis of six cores sampled in the ria, completed with absolute dating (C-14, and based upon Pb-210 exc.), allow us to identify three phases in the filling of the ria that are Limited by two transgressive shifts (3500 and 2500 yr. B.P.) already described in other areas of the Bay of Biscay. In the first phase, lithologies as well as benthic foraminifera and ostracode assemblages are typical of coastal marine palaeo-environment. During the second phase the euryhaline waters progessively occupy the central area of the estuary. Here the presence of allochthonous...
Tipo: Text
Palavras-chave: Microfaune; Sédimentation; Holocène terminal; Ria de Gernika; Microfauna; Sedimentation; Late Holocene; Ria de Gernika.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00326/43684/43237.pdf

Les variations architecturales des microfaunes du Lac de Tunis: relations avec l'environnement
Provedor de dados: 5
Autores: Carbonel, P; Pujos, M.
The bentonic microfauna of ostracodas and foraminiferas of Tunis lake is controlled for a reduced number of species (always the same), which are representative of a very isolated habitat type of the marine environment. The characteristic species (Cyprideis gr. Torosa and Ammonia gr. beccarii ) have a variable morphology; each of them presents three ecotypes which are the reflections of the water hydrochemical conditions (salt concentrations, ionic balance, dissolved oxygen). The observed specific variability in these organisms allows one to perceive the environment variations which cannot be discerned from a classical microfaunas approach.
Tipo: Text
Ano: 1982
URL: http://archimer.ifremer.fr/doc/00246/35705/34214.pdf

Origine de la sédimentation dans le delta de l'Orénoque et le golfe de Paria (Venezuela) : impact du système dispersif amazonien
Provedor de dados: 5
Autores: Pujos, M; Monente, J; Latouche, C; Maillet, N.
The suspended matter transported by the Orinoco to the Orinoco delta originates mainly in the Colombian Andes. The four clayey minerals (kaolinite, chlorite, illite and smectite) are always present in the deltaic suspensions, the delta deposits and the gulf of Paria. Illite contents are always dominant except in those regions of the gulf of Paria situated far from the mouths of the Orinoco tributaries characterized by smectites. In the delta, illite contents which are minimal during the dry season increase noticeably during the wet season which is marked by a high Liquid and particulate matter discharge. In the delta, the clay mineralogy of the substrate is comparable to that of dry season suspensions (February), thus showing a sedimentation composed of...
Tipo: Text
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20435/18102.pdf

Etude de surveillance écologique sur le site du Blayais. Rapport général
Provedor de dados: 5
Autores: Poli, J.m.; Pujos, M; Chaurial, Bernard; Salinieres, J.b.; Castel, J.; Courties, Claude.
Ce rapport présente les résultats obtenus en 1978 par trois équipes de recherche, dans le cadre du contrat CNEXO n° 78/1821/B, intitulé "Surveillance écologique du site du Blayais".
Tipo: Text
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00068/17911/15435.pdf

Analyse morpho-tectonique et caractère de la sédimentation au Quaternaire récent sur la plate- forme continentale Pacifique de la Colombie
Provedor de dados: 5
Autores: Pujos, M; Griboulard, R; Latouche, C; Meidinger, P.
The continental shelf is very narrow and steep to the north, and broader to the South. This shelf is structuraly influenced by the Andes. This area is mainly covered with terrigenous deposits, i.e. muds and sands which are recent on the internal shelf and relict on the external shelf. The sediments, supplied by rivers, reflect the intense erosion of the Andean backland. This erosion can only be reduced in situ by the vegetation cover. Clays are the main component of the fine fraction reaching the sea. Three different clay assemblages are observed: 1) an Andean (illite-chlorite) assemblage, reflecting the proximity of the cordillera; 2) a mid-American assemblage (smectite), which supplies the North Pacific Margin through the Choco counter-current; 3) an...
Tipo: Text
Ano: 1995
URL: http://archimer.ifremer.fr/doc/00097/20862/18480.pdf

La sédimentation au quaternaire terminal sur la plate-forme continentale de la Guyane française
Provedor de dados: 5
Autores: Pujos, M; Odin, Gs.
Tipo: Text
Ano: 1986
URL: http://archimer.ifremer.fr/doc/00110/22089/19730.pdf