Major change in Atlantic deep and bottom waters 700,000 yr ago: benthonic foraminiferal evidence from the South Atlantic
Analysis of the benthonic foraminiferal faunas in two sediment cores recovered from the Vema and Hunter Channels in the western South Atlantic shows that the level of the transition between deep and bottom waters shallowed sharply about 700,000 yr
ago. This rise indicates a sharp, sustained increase in the volume of bottom water flowing through the South Atlantic after this time. Prior to about 700,000 yr ago, the amount of Antarctic Bottom Water entering the western South Atlantic was greatly
reduced and Circumpolar Deep Water apparently accounted for the bulk of northward flow. Production of southward-flowing North Atlantic Deep Water seems not to have been affected. The timing of this change in circulation regime suggests a possible causal
Freshwater diatom influx in intertropical Atlantic : relationships with continental records from Africa
This tentative approach shows that freshwater diatoms in Atlantic cores may be a good tool for reconstructing paleoclimates and for establishing continent-ocean correlations if species analyses are made and if the continental distribution
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
Plate kinematic implications of Atlantic Equatorial fracture zone trends
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
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)
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).
Comparison between satellite and ship measurements of sea surface temperature in the north-east Atlantic Ocean in Special issue : Applications of AVHRR data.