South Atlantic Kinematics and The Evolution of Tristan da Cuhna Hotspot Tracks

摘要

Documenting the relationship between the formation of the Tristan da Cuhna hotspot tracks and theopening of the South Atlantic Ocean basin, particularly as continental extension ended and oceanic crustbegan to form, can help us understand the role of magma sources and crustal evolution. We examineseafloor spreading magnetic anomaly profiles and calculate new reconstruction poles for the SouthAmerican and African plates, we then use the results of a basin-scale 3D density inversion to compare theevolution of the Rio Grande Rise and Walvis Ridge hotspot tracks from ~130 Ma to 10 Ma.