Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 47124 ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ The history of South Atlantics spreading ridges development and time -- space position of Bouve triple connection The history of South Atlantics spreading ridges development and time -- space position of Bouve triple connection Dubinin E P Dubinin E P Sushchevskaya N M Sushchevskaya N M Grokhol'skiy A L Grokhol'skiy A L Moscow State University, Moscow, Russia ru Moscow State University, Moscow, Russia ru Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, Russia ru Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, Russia ru Moscow State University, Moscow, Russia ru Moscow State University, Moscow, Russia ru 1 5 423 443 11 11 2021 https://rjes.ru/en/nauka/article/47124/view

Using the example of the evolution of spreading ridges, connected in the zone of the Bouve triple connection, it is shown that the evolution history of the South Atlantic Ocean included at least three time intervals, when its spreading ridges were connected with one another to form three Bouve triple connections TC: the Bouve TC-1 existed 119-122 million years ago, TC-2, 93-105 million years ago, and TC-3 is a modern triple junction. Changes in the relative movements of the lithospheric plates resulted in the disturbances of the spreading ridge geological structure, and were accompanied by the further propagation and skipping of the rift valleys, as well as by the destruction and dying-off of the spreading ridges. The geodynamic environments included 1the migration of the asthenospheric flows during the propagations of the continental rifts during the periods of the Gondwana continents break-ups and the formation of the Southwest Indian Ridge SWIR and the Southern Mid-Atlantic Ridge SMAR; 2the migration of the flows during the advance of the oceanic rifts western SWIR segment and the jumping over of the spreading ridges SMAR, caused by changes in the relative directions of the crustal plate movements; 3the disturbance of the asthenospheric flow by the continental "barrier" of the Falkland Plateau during the development of the Bouve-1 triple connection, which resulted in the huge displacement of the rift axis along the Agulhas-Falkland transform zone; 4the interaction of the subaxial asthenospheric flows possibly varying in depth, temperature, and viscosity in the region of the large Bain-Prince Eduard transform displacements in the Southwest Indian Ridge, and 5the outbreak of the asthenospheric flow along the channel between the two continental blocks, namely, the Antarctic Peninsula and the southern termination of South America, which resulted in the formation of a new plate Scotia and of a new transform-divergent boundary between the plates of the American-Antarctic Ridge.

Using the example of the evolution of spreading ridges, connected in the zone of the Bouve triple connection, it is shown that the evolution history of the South Atlantic Ocean included at least three time intervals, when its spreading ridges were connected with one another to form three Bouve triple connections TC: the Bouve TC-1 existed 119-122 million years ago, TC-2, 93-105 million years ago, and TC-3 is a modern triple junction. Changes in the relative movements of the lithospheric plates resulted in the disturbances of the spreading ridge geological structure, and were accompanied by the further propagation and skipping of the rift valleys, as well as by the destruction and dying-off of the spreading ridges. The geodynamic environments included 1the migration of the asthenospheric flows during the propagations of the continental rifts during the periods of the Gondwana continents break-ups and the formation of the Southwest Indian Ridge SWIR and the Southern Mid-Atlantic Ridge SMAR; 2the migration of the flows during the advance of the oceanic rifts western SWIR segment and the jumping over of the spreading ridges SMAR, caused by changes in the relative directions of the crustal plate movements; 3the disturbance of the asthenospheric flow by the continental "barrier" of the Falkland Plateau during the development of the Bouve-1 triple connection, which resulted in the huge displacement of the rift axis along the Agulhas-Falkland transform zone; 4the interaction of the subaxial asthenospheric flows possibly varying in depth, temperature, and viscosity in the region of the large Bain-Prince Eduard transform displacements in the Southwest Indian Ridge, and 5the outbreak of the asthenospheric flow along the channel between the two continental blocks, namely, the Antarctic Peninsula and the southern termination of South America, which resulted in the formation of a new plate Scotia and of a new transform-divergent boundary between the plates of the American-Antarctic Ridge.

 South Atlantics spreading ridges evolution of spreading ridges Bouve triple connection. South Atlantics spreading ridges evolution of spreading ridges Bouve triple connection.

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