Alpine ocean seafloor spreading and onset of pelagic sedimentation : new radiolarian data from the Chenaillet-Montgenèvre ophiolite (French-Italian Alps)
Radiolarians of Middle Jurassic age provide the first direct age determination from oceanic sediments associated with the Chenaillet-Montgenèvre ophiolite (Piemonte zone). This datum obtained from radiolarites of the Lago Nero-Replatte thrust sheet
pelagic sedimentation, or more likely that the Lago Nero-Replatte and the Chenaillet s.s. thrust sheets are distinct and distant pieces of lithosphere. These results strengthen the Bathonian correlation of widespread seafloor spreading in both western
Characterizing the pelagic fish assemblage in Lake Paanajärvi : scarce stocks and large individuals
The structure of fish stocks in the pelagic areas of Paanajärvi, a deep northern lake in a natural state, was characterized by means of echo surveys and test fishing in 1992-1994. The pelagic fish densities were in general relatively large
, their size distribution resembling more that of pelagic areas in practically unfished natural lakes than that of exploited lakes. The structure of the pelagic fish assemblage in Paanajärvi stresses the importance of nature conservation as means of evaluating
Examples of Late Miocene fault reactivation, observed in Western Sicily, are illustrated. Reactivation consists of positively inverted Mesozoic structures may be identified as the weakness zones of the hinge between carbonate platforms and pelagic
The mass accumulation and grain size of the total eolian component isolated from pelagic sediment in two North Pacific cores have been used to evaluate changes in the intensity of atmospheric circulation and source-area aridity over the past 700,000
-to Submediterranean benthic vegetation exists also in Adriatic bottoms. Four different types of coastal zonations are registered: widespread mesic of E. Adriatic, xeric one in dry pelagic isles, humid one in SE. coast, and a special stormy one in NE. coast exposed
Balance of organic fluxes in the Gironde dilution plume : ecological importance of microbial loop and microbial food web processes in spring, in the photic zone
Characteristics of the pelagic ecosystem of the French bay of Biscay submitted to the influence of the Gironde dilution plume were defined, in spring, taking into account the structure and magnitude of both microplanktonic stocks and dynamics
were measured at the base of the euphotic zone in the three spring periods. The inner-shelf euphotic zone constituted, in spring, a maintenance system where microbial loop and microbial food web processes, in addition to playing an important role
gravité, alors que dans les zones décrochantes cette accumulation de fluides n'a pas pu se produire. Celles-ci ont donc constitué un bloc parfaitement homogène ne laissant aucune prise au pelage gravitationnel.
La chaîne rifaine offre un exemple intéressant du contrôle tectonique de la répartition des faibles métamorphismes. Le métamorphisme étant étroitement dépendant de la circulation des fluides, il est montré que dans les zones chevauchantes, les
biology of the species is described. The seasonal distribution and demographic structure of the Possession Island's population is described. As an extreme K-strategist, the Sooty Albatross appears to be remarkably adapted to exploit the pelagic resources
Regional distributions of tephra deposits within Upper Quaternary pelagic sediments of the eastern Mediterranean and southern Aegean Seas have been determined from cores of deep-sea sediments. Slumping or other mass-wasting processes on the sea
The design and methodology of a new model of epibenthos trawling is described. The array of catch obtained is compared with commercial trawl in the same point. 162 species are analysed in functional groups, 6 of each were pelagic species.
siliciclastic-carbonate Pseudoverrucano successions argues for a coastal sedimentation on narrow shelves delimited by active, fault-bounded highs, representing the landward extension of the epicontinental/pericontinental pelagic basins that from late Triassic
A detailed study has been carried out, integrating biostratigraphy, sedimentology and physical stratigraphy, on Albian-Eocene pelagic sediments (Hybla and Amerillo formations) of the western sector of Rocca Busambra (Trapanese Domain, Western Sicily
by the dispersal of pelagic larvae. Models of marine population dynamics must account for larval connectivity. To allow more informed decision making when complete information on dispersal is lacking, the AA. have developed a method based on geographic information