964 resultados para Centre national de la photographie (France)


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Mineralogical analysis of manganese nodules and crusts collected from Indian ocean aboard Marion Dufresne points to a depth and regional control upon the manganese oxide association: vernadite - birnessite and vernadite - todorokite. Moreover, progressive changes in the vernadite/birnessite ratio as a function of time is clearly seen. Magnetite and titano-magnetite in quantities similar to those of framboidal pyrite in manganese nodules are outlined for the first time. Study of the distribution of metals (Mn, Fe, Ni, Cu, Co) shows a strong latitudinal and regional dependence that may be connected to high productivity zones and to bottom water properties. The problem of mineralogical control on the chemical composition is approached. Finally, it results that any interpretations taking into account all these data haveway to give to the variability of sea-water properties (pH, oxygenation, motions) the prominent control upon manganese nodules composition.

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Published with the help of the Conseil général du Rhône; the GDR 2135, "Textes pour l'histoire de l'Antiquité tardive" and l'Institut des "Sources Chretiennes" (U.M.R. 5035 du Centre National de la Recherche Scientifique).

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Mode of access: Internet.

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Includes v. 1-2, 1934-35, of Congrès archéologique de France. [Séances générales tenues par la] Société française d'archéologie.

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Includes bibliographical references and indexes.

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Narré du père Druillettes.--Lettre du père Druillettes à Jean Winthrop.--Lettre du père Druillettes.--Extraits du Journal des Supérieurs des Missions.--Lettre écritte par le Conseil de la Nouvelle France aux Commissionnaires de la Nouvelle Angleterre.--Extrait des Registres de l'Ancien Conseil de la Nouvelle France, et Lettre de M. d'Ailleboust.--Note sur le Narré.