Petrology, geochemistry and evolution of the Labrador Trough Basaltic Suite, Labrador and New Quebec

The central Labrador Trough is an Early Proterozoic volcano-sedimentary succession which preserves the remnants of a major magmatic province, the Labrador Trough Basaltic Suite (LTBS). The Menihek gabbros, which are distinctive members of the LTBS, form a sill-sediment complex with turbidites of the Menihek Formation. The Menihek gabbros often exhibit spectacular plagioclase glomeroporphyritic textures.;Tholeiitic basalts of the LTBS (Le Fer and upper Menihek/Willbob basalts) exhibit many textural and geochemical similarities, despite a difference of ;The stratigraphic and geochemical characteristics of the LTBS suggest that magmatism accompanied crustal extension and formation of pull-apart basins on the thinned margin of the Superior craton. Initial cycle 1 sedimentation (...