Pre-to-syn-rift tholeiitic magmatism in a transtensive hyperextended continental margin: Onshore and offshore magmatism of the Campos Basin, SE Brazil

• DOI: 10.1016/j.jsames.2021.103218
• Publication Date: 2021-02-17T13:53:51Z
• Authors: Julio Almeida; Monica Heilbron; Eliane Guedes; Franz Neubauer; Bernroider Manfred; Martin B. Klausen; Claudio de Moriss...; Henrique Bruno; João Paulo Giro; Michael McMaster; Wolfram Tetzner
• Keywords: 13. Climate action; 15. Life on land; 01 natural sciences; 0105 earth and related environmental sciences

Abstract The wide range of geochemical and isotopic signatures of dyke swarms are essential for defining tectonic settings and isotopic reservoirs, as they represent windows into the Earth's mantle. The Early-Cretaceous Buzios-Cabo Frio dyke swarm (BCFDS) represents the easternmost pre-rift magmatism within the Campos Basin's onshore basement. This magmatism is associated with the break-up of Gondwana and subsequent opening of the South Atlantic Ocean. Whole-rock geochemistry, mineral chemistry and petrography suggest an FC evolutionary process for this low-TiO2 (