Origin and age of coeval gabbros and leucogranites in the northern subprovince of the borborema province, NE Brazil

In the studied area other Ediacaran extension related mafic rocks do occur. They have geochemical and isotopic signatures distinct from those recorded in Riachão mafic rocks. A Paleoproterozoic enriched mantle has been proposed as the source of these mafic rocks. The data suggest that extension and mafic magmatism favoured extensive melting of the Serrinha - Pedro Velho Complex at 582-588 Ma ago. A similar aged event is also recorded in southeastern Ghana, and interpreted as syn-orogenic extension related to the collisional orogeny at the margin of the West African craton.