Fig. 1: Bathymetric map of the South Atlantic Ocean.
From: Mantle plume and rift-related volcanism during the evolution of the Rio Grande Rise
a The map shows the locations of the Rio Grande Rise and Walvis Ridge. Grey areas on the South American and African continents are the Paraná and Etendeka Continental flood basalt provinces (CFBs), respectively. MAR stands for Mid-Atlantic Ridge. b Zoomed map section from a. Detailed map of the Rio Grande Rise showing the Eastern Rio Grande Rise (ERGR), Western Rio Grande Rise (WRGR) and the Jean Charcot Seamount Chain (JCSC). The blue framed white square marks the position of a dredge site from where alkaline samples with an age of ~46 Ma16,18 were previously collected. White arrows mark the deep valley of the Cruzeiro do Sul Rift (CdSR). Contour line interval is 500 m. Digital elevation models are based on the GEBCO_2020 Grid (http://www.gebco.net).
