for the opening of the Plio-Quaternary Strait of Gibraltar. The strait of Gibraltar results from the work of a stream, which managed water-piracy from an Ocean.
Basalt magma sources during the opening of the North Atlantic
The mantle that supplied basalts to the North Atlantic Tertiary province at the time of continental breakup was isotopically similar to the present-day sub-oceanic mantle. There is no evidence for undepleted source regions beneath the continent
Bau der Lithosphäre in der Ubergangszone von der Mitteleuropäischen Senke zum Atlantischen Ozean. (Structure of the lithosphère in the transition zone between the Central-European depression and Atlantic Ocean)
Atlantique ; Atlantique Nord-Est ; Europe ; Europe centrale ; Europe du nord ; Géographie physique ; Géophysique ; Interface terre-océan ; Lithosphère
Geodynamical processes and interrelations between the opening of the Atlantic ocean, the development of transition zone and the Central-European depression are analyzed by means of investigations of the transition zone between the Central-European
depression and the Atlantic ocean. A scheme of the depths of the asthenospere-lithospere border is discussed. (HL).
Changement global ; Effet de serre ; Océan ; Réchauffement climatique ; Théorie ; Variation climatique
Climatic variation ; Climatic warming ; Global change ; Greenhouse effect ; Ocean ; Theory
. A. states, that since many of the processes at the depths of oceans are largely unknow, many of the open issues are related to the role of oceans in global climatic change. - (JS)
We present a plate kinematic evolution of the South Atlantic which is based largely on the determination of the equatorial fracture zone trends between the African and South American continental margins. Four main opening phases are dated by oceanic
magnetic anomalies, notably MO, A34 and A13, and are correlated with volcanism and tectonic events on land around the South Atlantic Ocean. The Ceara and Sierra Leone rises are probably of oceanic origin and were created 80m.y. ago or later in their present
change yet obtained from an openocean location. The record includes a three-step termination and the first direct evidence of an early deglacial meltwater spike in the open sea.
The fossils occur in marine and (less frequently) in freshwater deposits, and they provide evidence of the beginning of the opening of the Mozambique Channel between Malagasy and Africa, in Eotriassic times. The occurrence of the genus in Gondwana
and in northern continents indicates that the Tethys and Arctic oceans were connected.
The role of the North Atlantic Ocean in rapid glacial growth in Evolution des atmosphères planétaires et climatologie de la terre=Evolution of planetary atmospheres and climatology of the earth.
... During periods of rapid ice accretion, high latitude North Atlantic surface waters remain warm while summer insolation decreases. This lag effect has been documented for the isotopic 5a/4transition. Thus an open moisture source exists adjacent
to cooling snow-covered land masses. The latent heat provided by the warm oceans helps fuel glacial growth.
Etudes biologiques et géologiques du fond de l'océan dans l'Atlantique Sud
Atlantic Ocean ; Bathymetry ; Geophysics ; Global tectonics ; Island arc ; Magnetic anomaly ; Oceanic ridge ; Plate tectonics ; Sea current ; Sea floor;Ocean floor ; South Atlantic Ocean ; Submarine geomorphology ; Submarine valley
-American and Antarctic lithospheric plates and young Scotia plate. The opening of the Scotia Sea (South Antillean basin) had taken place at 30-31 m.y. ago; the Drake Strait―at 20-23 m.y. At the same time the Antarctic Circumpolar Current―the dominant
features of the Southern Ocean circulation―was arised. Investigation carried out during cruises of the r/v « Academic Kurchatov » (1985) and the r/v « Dmitry Mendeleev » (1989) permitted to reveal principal geomorphological properties of the South-Antillean
basin, its bordering ridges and Mid-Scotia Ridge. One more ridge of mid-oceanic type was created in eastern part of the Scotia Sea about 7 m.y. ago (Late Miocene). Some new transform faults were discovered. A new morphostructural map of South-West
Atlantic Ocean and Scotia Sea was compiled. - (L'A.).
supercontinent. In late Jurassic time a connection between Africa and South America probably still existed, and this seems to have persisted into the Cretaceous, even though there was an opening of the South Atlantic Ocean. Antarctica and Australia, connected
The distribution of late Triassic tetrapods indicates that although the rifting of Gondwana may have been initiated then, there were nonetheless open avenues for the movements of land-living vertebrates accross the breadth of the ancient
In spite of the differences in their morphological evolutions, both regions have been influenced by comparable tectonic sequences including Mesozoic rifting and later uplift induced by oceanicopening, and by the tendency to eustatic lowering during
The Central Namib Desert in Namibia is a hyperarid area which was greatly affected by tectonic changes in the Early Cretaceous, asociated with the opening up of the South Atlantic Ocean, continental fragmentation of West Gondwanaland
The fusulinid limestones were deposited in an equatorial belt of openocean, distant from the New Zealand Gondwana margin, where climate contrasted markedly with the cold environment of continental New Zealand represented by the Parapara Peak
This paper addresses particularly the possibilities of remote sensing techniques for the hydro- and morphodynamics of the coastal zone s.s. An integrated approach combining remote sensing data and specific hydrodynamic modelling has opened