scholarly journals NEW RESULTS OF THE PALAEOENVIRONMENTAL AND ARCHAEOLOGICAL RESEARCH OF THE SUBNEOLITHIC HUNTSEAFLOOR MAPPING OF THE ATLANTIC OCEAN BY GMT: VISUALIZING MID ATLANTIC RIDGE SPREADING, SEDIMENT DISTRIBUTION AND TECTONIC DEVELOPMENTER-GATHERER COMMUNITIES OF THE NIEMEN CULTURE CASE STYDY FOR LIPSK SITE (NE POLAND)

2020 ◽  
Vol 6 (3) ◽  
pp. 137-144
Author(s):  
Marcin Frączek ◽  
◽  
Agnieszka Bęben ◽  
Krzysztof Żurek ◽  
Tomasz Kalicki ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Archaeological Research ◽  
Sediment Distribution ◽  
Ne Poland ◽  
Mid Atlantic Ridge

Surveying the flanks of the Mid-Atlantic Ridge: the Atlantis Basin, North Atlantic Ocean (36°N)

2004 ◽  
Vol 209 (1-4) ◽  
pp. 199-222 ◽  
Author(s):  
T.M. Alves ◽  
T. Cunha ◽  
S. Bouriak ◽  
A. Volkonskaya ◽  
J.H. Monteiro ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Mid Atlantic Ridge

scholarly journals Living organisms pseudomorphs in modern volcanites of the Mid-Atlantic Ridge

2020 ◽  
Vol 12 ◽  
pp. 26-31
Author(s):  
I. G. Dobretsova ◽  
Keyword(s):  
Atlantic Ocean ◽  
Volcanic Rocks ◽  
Sulfide Ores ◽  
Geological Processes ◽  
Deposit Feeders ◽  
Geological Past ◽  
Mid Atlantic Ridge ◽  
Living Organisms

The study of samples of volcanic rocks, sulfide ores, and near-ore metasomatites from the bottom of the Atlantic Ocean resulted in the discovery of vital forms of organisms: foraminiferal shells, mineral pseudomorphs after the bodies of polychaetes, deposit feeders, and other fauna. This allows us to understand not only modern geological processes in the depths of the oceans, but also to reconstruct events of the distant geological past based on the principle of actualism.

The Mid-Atlantic Ridge Near 45 °N. XXII. Sedimentary Deposition and Lithogenesis on Mid-Atlantic Ridge Mountain Tops

1974 ◽  
Vol 11 (8) ◽  
pp. 1157-1167 ◽  
Author(s):  
Charles T. Schafer
Keyword(s):  
Surface Sediments ◽  
Bottom Current ◽  
Current Direction ◽  
Sediment Distribution ◽  
Rock Types ◽  
Rock Cores ◽  
Rapid Changes ◽  
Unconsolidated Sediment ◽  
Mid Atlantic Ridge ◽  
Coralline Limestone

Bottom photographs and drilled rock cores collected on several mountain tops along the crest of the Mid-Atlantic Ridge near 45°N describe the sediment distribution, sediment dynamics and shallow stratigraphy of these sites. Lag pebble deposits and pebble waves indicate rapid changes in bottom current direction and velocities that may approach 100 cm/s (>2 knots) one meter above the bottom so that surface sediments are often not indicative of sediment and rock types sampled using shallow drilling techniques. Absolute dates (14C) of coralline limestone, which underlies coarse unconsolidated sediment at most drilling sites, suggest deposition and initial lithification of these deposits during a middle Wisconsin interstadial period.

scholarly journals Occurrence of Omura’s whale, Balaenoptera omurai (Cetacea: Balaenopteridae), in the Equatorial Atlantic Ocean based on Passive Acoustic Monitoring

2020 ◽  
Author(s):  
Sergio C Moreira ◽  
Marcelo Weksler ◽  
Renata S Sousa-Lima ◽  
Marcia Maia ◽  
Alexey Sukhovich ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Northeastern Brazil ◽  
Equatorial Atlantic ◽  
Equatorial Atlantic Ocean ◽  
Mid Atlantic Ridge ◽  
Vocal Activity ◽  
Passive Acoustic ◽  
Warm Temperate ◽  
The Western Pacific ◽  
Indian And Atlantic Oceans

Abstract The current known distribution of Omura’s whale includes the tropical and warm temperate waters of the western Pacific, Indian, and Atlantic Oceans. Evidence of their presence in the Atlantic Ocean is based on beach cast specimens found on the coasts of Mauritania (North Atlantic) and Northeastern Brazil (South Atlantic). The present study characterizes the occurrence of this species in the São Pedro and São Paulo Archipelago (SPSPA), on the mid-Atlantic ridge between South America and Africa, based on autonomous recording systems. Acoustic signals were similar, but not identical, to B. omurai vocalizations recorded off the coast of Madagascar. Although these signals were recorded for only 11 months, there are peaks in vocal activity between May and June in the vicinities of SPSPA, suggesting either a shift in distribution within the Atlantic equatorial waters or seasonality in the species’ vocal behavior in this region. The first acoustic records of Omura’s whales in the Equatorial Atlantic suggest that these animals may also use deep-water habitats, in addition to the shallow-water habitat use observed in other regions.

scholarly journals RELIEF-FORMING FACTORS OF ATLANTIC OCEAN TRANSFORM FAULTS

2021 ◽  
pp. 41-57
Author(s):  
V.A. Bogolyubsky ◽  
◽  
E.P. Dubinin ◽  
S.Yu. Sokolov ◽  
◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Deep Structure ◽  
Morphometric Parameters ◽  
Active Part ◽  
Transform Fault ◽  
Transform Faults ◽  
Bathymetric Data ◽  
Analogue Modeling ◽  
Mid Atlantic Ridge ◽  
Axis Offset

Transform faults are widespread within the Atlantic Ocean. Their relief is determined by a variety of factors related mainly to the peculiarities of the deep structure of the lithosphere and regional geodynamics. The degree of their influence changes when passing from one morphotectonic province of the Atlantic Ocean to another. The differences are manifested in the morphology of the main elements of the transform fault and the correlation of their morphometric parameters with the length of the active part, which was shown earlier by analogue modeling. The dependence between the depth of the transform valley and the axis offset of the Mid-Atlantic Ridge along the transform fault has been revealed. Variations in the values of morphometric parameters are interpreted as a consequence of different duration of fault development, as well as different degrees of influence of secondary factors within each of the provinces. Based on the analysis of the bathymetric data on the Atlantic transform faults, five main groups of relief-forming factors are identified, and the relative degree of importance of the factors is determined for each of them. It is assumed that the identified dependences are preserved for the transform faults in other oceans.

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